What does phylum Arthropoda mean?

definition and meaning (Free English Language Dictionary) class Hexapoda ; class Insecta ; Hexapoda ; Insecta (insects; about five-sixths of all known animal species) class Onychophora ; Onychophora (enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids) class Crustacea ; Crustacea (class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas) Pentastomida ; subphylum Pentastomida (tongue worms) class Diplopoda ; class Myriapoda ; Diplopoda ; Myriapoda (arthropods having the body composed of numerous double somites each with two pairs of legs: millipedes) Chilopoda ; class Chilopoda (arthropods having the trunk composed of numerous somites each bearing one pair of legs: centipedes) class Tardigrada ; Tardigrada (in some classifications considered a separate ph

ylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needlelike piercing organs connected with the pharynx) class Symphyla ; Symphyla (small class of minute arthropods; unimportant except for the garden centipede) class Pauropoda ; Pauropoda (an obscure class of minute arthropods with branched antennae and 8 to 10 pairs of legs) superclass Myriapoda (used in some classifications to encompass the millipedes (Diplopoda) and centipedes (Chilopoda); formerly a large taxon including also the Pauropoda and Symphyla; the term Myriapoda now usually used synonymously with Diplopoda and limited to the millipedes) Habits and Traits of Centipedes, Class Chilopoda Centipedes and Millipedes Habits and Traits of Centipedes, Class Chilopoda The front pair of a centipede's legs are modified into poison-filled fangs, capable of subduing prey.

Photo: Flickr user ◄M► Taken literally, the name centipede means "one hundred feet." While they do have a lot of legs, this is really a misnomer. Centipedes can have anywhere from 30 to over 300 legs, depending on the species. Classification: Centipedes belong to the phylum Arthropoda, and share all the characteristic arthropod traits with their cousins, the insects and spiders. But beyond that, centipedes are in a class by themselves – the class Chilopoda. Description: Centipede legs extend visibly from the body, with the final pairs of legs trailing behind it. This allows them to run quite fast, either in pursuit of prey or in flight from predators. Centipedes have just one pair of legs per body segment, a key distinction from millipedes. The centipede body is long and flattened, with a long pair of antennae protruding from the head. A modified pair of front legs functions as fangs, used to inject venom and immobilize prey. Diet: Centipedes prey on insects and other small animals.

continue reading below our video What are the Seven Wonders of the World Some species also scavenge on dead or decaying plants or animals. Giant centipedes, which inhabit South America, feed on much larger animals, including mice, frogs, and even snakes. While house centipedes may be creepy to find in the home, you might want to think twice about harming them. House centipedes feed on insects, including the egg cases of cockroaches. Life Cycle: Centipedes may live for as long as six years. In tropical environments, centipede reproduction usually continues year round. In seasonal climates, centipedes overwinter as adults and reemerge from their sheltered hideaways in spring. Centipedes undergo an incomplete metamorphosis , with three life stages. In most centipede species , females lay their eggs in soil or other damp organic matter. The nymphs hatch, and go through a progressive series of molts until they reach adulthood. In many species , young nymphs have fewer pairs of legs than their parents. With each molt, the nymphs gain more pairs of legs. Special Adaptations and Defenses: When threatened, centipedes use a number of different strategies to defend themselves.

Large, tropical centipedes don't hesitate to attack, and can inflict a painful bite. Stone centipedes use their long hind legs to throw a sticky substance at their attackers. The centipedes that live in soil don't usually try to retaliate; instead, they curl themselves into a ball to protect themselves. House centipedes choose flight over fight, skittering quickly out of harm's way. Arthropods Arthropods Indicate whether the sentence or statement is true or false. Arthropods may have either an open or a closed circulatory system. Arthropods have an exoskeleton made of chitin. The bodies of arthropods are encased in a shell-like exoskeleton. 5. The outer layer of the arthropod exoskeleton is shed during molting, but products of the breakdown of the exoskeleton inner layer are used to make a new exoskeleton. Crustaceans range in size from microscopic forms to huge lobsters. 8. Despite the high concentrations often found in the sea, copepods play a very small role in the oceans food web. Female spiders use silk to entrap a prospective mate as part of the mating ritual. 10.

Except for the number of legs, millipedes and centipedes are basically the same in structure and diet. What does Arthropoda mean?

definition and meaning (Free English Language Dictionary) class Hexapoda ; class Insecta ; Hexapoda ; Insecta (insects; about five-sixths of all known animal species) class Onychophora ; Onychophora (enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids) class Crustacea ; Crustacea (class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas) Pentastomida ; subphylum Pentastomida (tongue worms) class Diplopoda ; class Myriapoda ; Diplopoda ; Myriapoda (arthropods having the body composed of numerous double somites each with two pairs of legs: millipedes) Chilopoda ; class Chilopoda (arthropods having the trunk composed of numerous somites each bearing one pair of legs: centipedes) class Tardigrada ; Tardigrada (in some classifications considered a separate ph

ylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needlelike piercing organs connected with the pharynx) class Symphyla ; Symphyla (small class of minute arthropods; unimportant except for the garden centipede) class Pauropoda ; Pauropoda (an obscure class of minute arthropods with branched antennae and 8 to 10 pairs of legs) superclass Myriapoda (used in some classifications to encompass the millipedes (Diplopoda) and centipedes (Chilopoda); formerly a large taxon including also the Pauropoda and Symphyla; the term Myriapoda now usually used synonymously with Diplopoda and limited to the millipedes) Arthropods | Kathy's Critters Insects: Six legs, three body parts and one pair antennae.

Arachnids: Eight legs, two body parts, no antennae. Millipedes: Many segments, one pair antennae, two short pairs of legs per apparent segment, harmless scavengers. Centipedes: Many segments, one pair antennae, one pair of long legs per segment, venomous predator Crustaceans: 10 to 14 legs, two pair antennae, mainly aquatic (lobsters, crabs, shrimp, etc.). Terrestrial species include Rollie-polies and Sowbugs. Masses of Madagascan Hissing Cockroaches Madagascan Hissing Cockroaches, as the name states, come from Madagascar (a large island east of Africa) and they hiss. Insects breathe through pores in the side of the abdomen called “spiracles”. When the Hissing Cockroach is disturbed, it forcefully expels air out of these spiracles, creating a very audible hissing sound. Cockroaches, believe it or not, actually have an important function in nature. They are scavengers, feeding on all kinds of decaying matter. Scavengers help “clean up” the environment. There are over 4,000 species (different kinds) of cockroaches.

Most live outdoors and are beneficial to the environment. Very few species ever go into homes and become pests. Those that do reside with humans have given all cockroaches a “bad name”. Vinnie – Vinegaroon or Whipscorpion Vinegaroons, (sometimes spelled Vinegarone), also known as Whipscorpions are a very interesting and harmless arachnid belonging to the order Uropygi. They have no venom and do not sting or bite. Whipscorpions are so named because of a long whip-like tail which is used as a sensory device. The name “Vinegaroon” comes from the fact that their primary defense against an attack from predators is a vinegar scented spray of acetic acid that they shoot from a pair of glands located under their tail. Being an Arachnid, they have 8 legs, the first pair of legs are very long and flexible and are used as feelers (Arachnids do not have antennae). The last three pairs of legs are used for walking. Vinegaroons have enlarged, powerful pincer-like pedipalps (“pinchers”) that they use to catch and crush small insects which they eat.

They could possibly “pinch” a human finger with these, but in my many years’ experience with these animals, I’ve never seen this happen. There are about 130 species of Uropigids worldwide, but we have only one species of Whipscorpion found in the United States. That one happens to be the largest species of them all, the Mastigoproctus giganteus which can measure up to six inches from the tip of the tail to the pedipalps. Stinker – Darkling Beetle Darkling Beetles, sometimes also called “Stink Beetles ” or “Stink Bugs”, are a common beetle in the same family as the “mealworm”. They are frequently seen in a well-known pose: head down, rear end pointing up. When seen in this position, the knowledgeable person will “let him be” for fear of retaliation. . .a whiff of something foul. They can emit a pretty “icky-smelling”, but harmless substance for self defense. Darkling Beetles are harmless scavengers. Zigfried – Centipede Centipedes prefer moist places such as under rocks, fallen leaves, rotting logs, etc. The word “centipede” means “hundred feet”.

They don’t really have a hundred legs, centipedes have one pair of legs per body segment, and, as you can see, have many segments. The first pair of legs on a centipede wrap towards the front of the head to form poison claws. Centipedes are venomous, and a large centipede could inflict a pretty painful, though not fatal, bite. The last pair of legs on a centipede are very long and can sometimes “pinch”. These longer legs also serve as a means of defense to confuse a predator. Can you guess which end is the head? Millie and Vanillie – Millipedes Millipedes are harmless scavengers commonly found in cool, moist places such as under rocks, fallen leaves, rotten logs, etc. The word “millipede” literally means “thousand feet”. They don’t really have a thousand legs, but they do have a lot! Their cylindrical bodies are made up of 25 to 100 somites (segments), most of which having two pairs of legs on each (with the exception of the first four somites which have one pair).

Different kinds of millipedes have a different amount of legs, some kinds of millipedes have only 3 or so pairs of legs when they hatch and add more as they grow. Millipedes have some interesting means of self-defense: they coil into a spiral when threatened and can secrete a noxious, foul-smelling substance (hydrogen cyanide) through their pores. Not all millipedes get as large as these, they are Giant Millipedes from Africa. Napoleon (pictured) and Nero – Emperor Scorpions Emperor Scorpions come from Africa and are among the largest scorpions in the world. All scorpions are venomous, but the venom of the Emperor Scorpion is very mild and not harmful to humans. They have very large pincers (“claws”) which are capable of giving a pretty painful pinch, though! Sting – Desert Hairy Scorpion The Desert Hairy Scorpion is found in the Sonoran Desert. They have a painful sting, but the venom is not fatal to humans. Rosie – Chilean Rosehair Tarantula As the name implies, the Rosehair Tarantula comes from Chile. They are fairly docile and rarely bite.

Should they bite, though, their venom is not fatal to humans. It is only strong enough to kill small insects (their primary diet). Penelope – Bird-eating Tarantula The Bird-eating Tarantulas come mainly from South America. Penelope is know as a “Lesser Black” Bird-eater which originates in Columbia and Peru. No, I don’t feed her birds! She gets fed crickets, mealworms (the super large size) and other invertebrates. Gulf Fritillary Butterfly and Passion Flower Gulf Fritillary Butterfly and Passion Flower Gulf Fritillary caterpillars only feed on the leaves (and sometimes flowers) of the passion vine and will eat nothing else. This is called being “host specific”. Other examples are the anise swallowtail butterfly catterpillar which only feeds on fennel and other parsley family leaves and the cabbage white which only feeds on leaves of the mustard and cabbage family. Habits and Traits of Millipedes, Class Diplopoda Habits and Traits of Millipedes, Class Diplopoda Millipedes often coil up when threatened.

Photo: Flickr user furryscaly (CC by SA license) By Debbie Hadley The common name millipede literally means thousand legs. Millipedes can have a lot of legs, but not nearly as many as their name suggests. If you compost your organic waste, or spend any time gardening , you're bound to find a millipede or two curled up in the soil. Classification: Like insects and spiders, millipedes belong to the phylum Arthropoda. This is where the similarities end, however, as millipedes belong to their own class – the class Diplopoda . Description: Millipedes move slowly on their short legs, which are designed to help them push their way through the soil and vegetative litter. Their legs remain in line with their bodies, and number two pairs per body segment. Only the first three body segments – those of the thorax – have single pairs of legs. Centipedes, in contrast, have single pairs of legs on every body segment. Millipede bodies are elongate, and usually cylindrical. Flat-backed millipedes, as you might guess, appear flatter than other worm-shaped cousins.

continue reading below our video Test Your General Science Knowledge You'll need to look closely to see a millipede's short antennae. They're nocturnal creatures that live mostly in the soil, and have poor sight when they can see at all. Diet: Millipedes feed on decaying plant matter, functioning as decomposers in the ecosystem. A few millipede species may be carnivorous as well. Newly hatched millipedes must ingest microbes to help them digest plant matter. They introduce these necessary partners into their systems by feeding on fungi in the soil, or by eating their own feces. Life Cycle: Mated female millipedes lay their eggs in the soil. Some species lay eggs singly, while others deposit them in clusters. Depending on the type of millipede, the female may lay anywhere from a few dozen to several thousand eggs in her lifetime. Millipedes undergo incomplete metamorphosis . Once the young millipedes hatch, they stay within the underground nest until they've molted at least once. With each molt, the millipede gains more body segments and more legs. It may take many months for them to achieve adulthood.

Special Adaptations and Defenses: When threatened, millipedes often curl into a tight ball or spiral in the soil. Though they cannot bite, many millipedes do emit poisonous or foul-smelling compounds through their skin. In some cases, these substances may burn or sting, and may even discolor your skin temporarily if you handle one. Some of the brightly colored millipedes secrete cyanide compounds. Large, tropical millipedes can even shoot a noxious compound several feet at their attacker's eyes. ARTHROPODS ARTHROPODS ï¿½ I.ï¿½ Instructional Objectives A.ï¿½ The student will be able to list three distinguishing characteristics of arthropods. B.ï¿½ The student will be able to relate the structure of the exoskeleton to its function. C.ï¿½ The student will be able to describe three products that researchers have developed from chitin.

ï¿½II.ï¿½ Set ï¿½ï¿½ï¿½ï¿½ Today what I would like for you to do first is to take out a piece of scrap paper and think about a few things for just a moment.ï¿½ Today we are going to begin a study of the phylum arthropoda.ï¿½ Three fourths of all animal species belong to the phylum arthropoda.ï¿½ Since there are so many arthropods living in the our ecosystem, we are obligated to find out more about these animals and learn about their life cycles.ï¿½ Think for just a minute about the reading that you did for today, and list three different arthropods.ï¿½ (Take some student answers.)ï¿½ Let's keep these animals in mind as we begin our study of arthropods. III.

Instruction ï¿½ï¿½ï¿½ï¿½ A.ï¿½ Input 1.ï¿½ Arthropod means "jointed foot".ï¿½ The phylum arthropoda contains 3/4 of all animal species.ï¿½ Some examples are:ï¿½ lobsters, crabs, crayfish, insects, millipedes, and centipedes.ï¿½ Although all these animals are different, all are alike in some of their characteristics.ï¿½ All the arthropods share four characteristics. a.ï¿½ All the arthropods have jointed appendages.ï¿½ APPENDAGES are extensions of the body that include legs and antennae. b.ï¿½ All the arthropods have segmented a segmented body.ï¿½ A pair of legs is attached to each segment.ï¿½ This does not hold true for all species.ï¿½ c.ï¿½ All the arthropods have an exoskeleton.ï¿½ An exoskeleton is a hard external covering that provides protection and support.ï¿½ Exo means "outer".

d.ï¿½ All arthropods have a ventral nervous system, an open circulatory system, a digestive system, and specialized sensory receptors.ï¿½ 2.ï¿½ Jointed appendages are the most distinctive trait that the arthropods possess.ï¿½ The exoskeleton of the arthropod is made up of three layers.ï¿½ The exoskeleton is made up primarily of protein and a tough carbohydrate called chiten.ï¿½ a.ï¿½ The first layer, the inner layer is made up of is a soft layer that is flexible at the joints and allows the animal to move freely. b.ï¿½ The second layer, the middle layer is made up of calcium.ï¿½ Its major function is protection. c.ï¿½ The third layer, the outer layer isa waxy layer that repels HOH and helps prevent dessication in terrestrial species. (drying out) ï¿½ï¿½ï¿½ï¿½ B.ï¿½ Monitor and Adjust 1.ï¿½ What proportion os all animal species are in the phylum arthropoda? 2.ï¿½ What are three examples of the animals in this phylum?

3.ï¿½ What are four characteristics of this phylum? 4.ï¿½ What does the term arthropod mean? 5.ï¿½ What makes up the exoskeleton? 6.ï¿½ What are the three layers of the exoskeleton? ï¿½ï¿½ï¿½ï¿½ C.ï¿½ Input 1.ï¿½ In the phylum annelida movement was controlled by the contraction of muscles that occurred in sheets around the body.ï¿½ In the phylum arthropoda, movement is achieved through a system of joints.ï¿½ These movements are controlled by a system of muscles that occur in bundles, much like those muscles found in humans.ï¿½ The muscles are anchored to the exoskeleton on either side of the joint.ï¿½ By the contraction and relaxation of these muscles, the arthropods are capable of a wide range of motion.

2.ï¿½ Because the exoskeleton cannot enlarge as the body grows, the exoskeleton must periodically be shed and a new one formed.ï¿½ This process is called molting.ï¿½ Molting is also referred to as ecdysis, which means "a slipping out or escape".ï¿½ During this ecdysis, the inner layer of the exoskeleton is digested by enzymes secreted by the epidermis.ï¿½ At the same time, the epidermis builds a new exoskeleton using much of the digested material.ï¿½ As this happens the outer layer of the exoskeleton begins to get loose and break along specific lines.ï¿½ 3.ï¿½ An arthropod sheds its exoskeleton several times during its life.ï¿½ During this molting period, the animal is very vulnerable and thus, goes into hiding until this period is finished. 4.ï¿½ Uses of Chiten--Varnishes, seed coatings to protect from diseases, artificial skin, filters, treatment for paper and clothing, and healing ointments.

ï¿½ï¿½ï¿½ï¿½ D.ï¿½ Monitor and Adjust 1.ï¿½ How is movement achieved in arthropods? 2.ï¿½ What anchors muscles in arthropods? 3.ï¿½ Does the exoskeleton grow? 4.ï¿½ Explain the process of ecdysis. 5.ï¿½ Name four uses for chiten other than the makeup of an exoskeleton. ï¿½IV.ï¿½ Closure Are there any questions concerning this material that we have covered today?ï¿½ Let's take just a few minutes and look at the notes you have taken today.ï¿½ 1.ï¿½ What proportion of all animal species are in the phylum arthropoda? 2.ï¿½ What are three examples of the animals in this phylum? 3.ï¿½ What are four characteristics of this phylum? 4.ï¿½ What does the term arthropod mean? 5.ï¿½ What makes up the exoskeleton? 6.ï¿½ What are the three layers of the exoskeleton? 7.ï¿½ How is movement achieved in arthropods?

8.ï¿½ What anchors muscles in arthropods? 9.ï¿½ Does the exoskeleton grow? 10. Explain the process of ecdysis. 11. Name four uses for chiten other than the makeup of an exoskeleton. ï¿½ I.ï¿½ Instructional Objectives A.ï¿½ The student will be able to give examples of crustaceans that are adapted to marine, aquatic and terrestrial environments. B.ï¿½ The student will be able to describe the external anatomy of a crayfish, and explain the function of each major part. C.ï¿½ The student will be able to summarize the processes of digestion, circulation, respiration, and excretion in the crayfish. D.ï¿½ The student will be able to describe the structure and function of the compound eye in crustaceans. E.ï¿½ The student will be able to list and describe the four subphyla of the phylum arthropoda.

ï¿½II.ï¿½ Set ï¿½ï¿½ï¿½ï¿½ Take out a sheet of paper and list the four characteristics of the phylum arthropoda.ï¿½ (Get student answers.)ï¿½ Today, we are going to begin our study with the subphylum crustacea.ï¿½ We will look at the crayfish as a representative of the subphylum crustacea because, it is large and easily studied and because, it is abundant and familiar to everyone.ï¿½ III.ï¿½ Instruction ï¿½ï¿½ï¿½ï¿½ ï¿½A.

ï¿½Input 1.ï¿½ Members of the subphylum crustacea have hard exoskeletons that contain calcium carbonate.ï¿½ This subphylum alone contains approximately 25,000 species, including, crayfish, lobsters, pill bugs, sow bugs, and barnacles.ï¿½ 2.ï¿½ The crustaceans are a diverse group adapted for marine aquatic, and terrestrial environments.ï¿½ The copepods are no larger than a comma.ï¿½ They live in both marine and aquatic environments.ï¿½ Terrestrial crustacens include sow bugs and pill bugs.ï¿½ Because these bugs have seven pairs of identical legs, they are called isopods, "same feet".ï¿½ 3.ï¿½ THE CRAYFISH -- The cray fish is similar to the lobsters in internal and external structures.ï¿½ a.ï¿½ EXTERNAL STRUCTURE -- The body of the crayfish is divided into two sections, the cephalothorax and the abdomen.ï¿½ The cephalothorax, consists of the fused head and the thorax.ï¿½ It has 13 segments and is covered by a

 hard covering.ï¿½ The abdomen, is divided into seven segments.ï¿½ The seventh segment forms a telson.ï¿½ The telson is a triangular section of the tail.ï¿½ A pair of appendages is attached to each segment.ï¿½ The antennules, are "little antennae" that are receptors for touch, taste, and equilibrium.ï¿½ The antennae, are large antennae that are specialized for touch and taste.ï¿½ï¿½ The mandibles, are appendages that move up and down to crush food.ï¿½ The maxillae, are appendages that move side to side in order to tear food particles apart.ï¿½ The maxillipeds, are jaws that are used to hold food.ï¿½ The chelipeds, are claws that capture food and also are used for defense.ï¿½ The walking legs, are the long legs that enable the crayfish to walk.ï¿½ The swimmerets, are short leg-like appendages that create water current and also aid in reproduction.ï¿½ The uropods, are fanlike sections that are attached at the telson and propel the crayfish.ï¿½ b.ï

¿½ DIGESTION AND EXCRETION -- The crayfish captures food with the chelipeds then tear it apart with the maxillae and maxillipeds.ï¿½ the food particles are then chewed by the mandibles.ï¿½ The food then passes through the esophagus to the stomach.ï¿½ In the stomach, much like the gizzard in the annelids, small teeth grind the food into a fine paste.ï¿½ this paste enters the intestine there the nutrients are absorbed and the undigested particles pass out of the body through the anus.ï¿½ Organs called the green glands, filter the salts out of the blood.

ï¿½ï¿½ï¿½ï¿½ ï¿½B.ï¿½ Monitor and Adjust 1.ï¿½ What are examples of some crustaceans that are adapted to marine, aquatic and terrestrial environments? 2.ï¿½ Describe the external anatomy of the crayfish. 3.ï¿½ Summarize the digestive process in crayfish.

ï¿½ï¿½ï¿½ï¿½ ï¿½C.ï¿½ Input c.ï¿½ CIRCULATION AND RESPIRATION -- The crayfish has an open circulatory system.ï¿½ the blood flows from a dorsal sinus through small one-way valves called ostia, into the dorsal heart.ï¿½ The heart then pumps blood through vessels and out into the body cavity where it bathes the organs and the cells.ï¿½ Blood collects in a ventral sinus and other vessels carry blood to the gills that are attached to the joints of the walking legs.ï¿½ As the crayfish walks HOH moves over the gills and O2 diffuses into the gills.ï¿½ CO2 diffuses out of the gills and into the HOH.ï¿½ d.ï¿½ NERVOUS SYSTEM -- The nervous system of the crayfish includes a brain and ventral nerve cord that runs from the brain to the tail.ï¿½ Nerves connect the eyes and antennae and antennules to brain.ï¿½ Crayfish have compound eyes, these are eyes that contain many lenses.ï¿½ The eyes of the crayfish contain >2,00

0 light sensitive lenses.ï¿½ These eyes are mounted on movable stalks.ï¿½ Statocysts, contain CaCO4 particles that sense position.ï¿½ Humans have similar systems in the ears and also use CaCO4 to detect position.ï¿½ E.ï¿½ REPRODUCTION AND DEVELOPMENT -- The male transfers sperm to the female by using the first and second pairs of swimmerets.ï¿½ The sperm remains in the female until the spring.ï¿½ As the eggs are laid they are fertilized.ï¿½ The eggs attach the last three pairs of the female's swimmerets and in about 6 weeks the eggs hatch into tiny adults.ï¿½ The young molt an average of 7 times in the first year and 2 times a year for the first two to three years.

ï¿½ï¿½ï¿½ï¿½ ï¿½D.ï¿½ Monitor and Adjust 1.ï¿½ Explain the processes of circulation, respiration, nervous response, and reproduction in the crayfish. ï¿½IV.ï¿½ Closure 1.ï¿½ What are examples of some crustaceans that are adapted to marine, aquatic and terrestrial environments? 2.ï¿½ Describe the external anatomy of the crayfish. 3.ï¿½ Summarize the digestive process in crayfish. 4.ï¿½ Explain the processes of circulation, respiration, nervous response, and reproduction in the crayfish. ï¿½ I.ï¿½ Instructional Objectives A.ï¿½ The student will be able to name the three main groups of arachnids, and list their distinguishing structural differences. B.ï¿½ The student will be able to explain the adaptations arachnids have for predatory life on land. C.ï¿½ The student will be able to compare and contrast the millipedes and centipedes. D.ï¿½ The student will list the four subphyla within the phylum arthropoda.

ï¿½II.ï¿½ Set ï¿½ï¿½ï¿½ï¿½ We have discussed theï¿½ characteristics of the phylum arthropoda and the subphylum crustacea.ï¿½ Today we will look at three other subphyla of the arthropods and then begin to break these down into classes.ï¿½ We will look at these in a little greater detail. III.ï¿½ Instruction ï¿½ï¿½ï¿½ï¿½ ï¿½A.ï¿½ Input 1.ï¿½ The four subphyla in the phylum arthropoda are trilobita crustacea, chelicaerata, and uniramia.

2.ï¿½ The subphylum Chelicerata contains spiders, scorpions and mites.ï¿½ Unlike the subphylum crustacea, the members of this subphylum are mostly terrestrial.ï¿½ The major class of chelicerata is the class arachnida.ï¿½ Like the crustaceans, the arachnids have a body that is divided into tow segments the cephalothorax and abdomen.ï¿½ Attached to the cephalthorax are four pairs of legs, a pair of chelicerae (pincher-like) and a pair of appendages called pedipalps.ï¿½ The pedipalps aid in chewing.

3.ï¿½ Spiders range in length from less than 0.5 mm to 9 cm in some tropical tarantula species.ï¿½ Some use webs, some trap doors, and some chase their prey.ï¿½ Most feed primarily on insects.ï¿½ Most scorpions live in tropical and semitropical areas.ï¿½ Two ways that scorpions and spiders differ is the sizeï¿½ of the pedipalps and scorpions have large stingers which they hold over their head.ï¿½ Most mites and ticks are parasitic.ï¿½ Some are merely pests and others are parasitic.ï¿½ Some transmit diseases such as Rocky Mtn.

Spotted Fever.ï¿½ Spider mites damage fruit trees by sucking fluid from their leaves.ï¿½ 4.ï¿½ STRUCTURE AND FUNCTION -- Arachnids and crustaceans share many characteristics.ï¿½ The nervous, digestive, and circulatory systems are structurally similar.ï¿½ Arachnids have a unique respiratory system because they are primarily terrestrial.ï¿½ Arachnids respire through openings in the cuticle called spiracles.ï¿½ Air passes th rough the spiracles to a book lung.ï¿½ The book lung contains page-like sections that provide a greater surface area across which gases are exchanged.ï¿½ 5.ï¿½ EXCRETORY SYSTEM -- The excretory system of arachnids is modified for terrestrial environments.ï¿½ The main excretory organs called Malpighian tubules, collect body fluids then filter out the wastes, and then carry the wastes to the intestines.ï¿½ The HOH is reabsorbed and the solid wastes leave the body.ï¿½ The coxial glands, remove the wastes and then eliminate them through tubes at the base of the legs.ï¿½ ï¿½ï¿

½ï¿½ï¿½ ï¿½B.

ï¿½Monitor and Adjust 1.ï¿½ What is the subphylum that contains spiders? 2.ï¿½ What is the major class of this subphylum? 3.ï¿½ The members of this class have how many body segments? 4.ï¿½ Members of the class arachnida have how many legs? 5.ï¿½ What do spiders feed on? 6.ï¿½ What are two ways that spiders and scorpions differ? 7.ï¿½ What is one is one disease spread by the tick? 8.ï¿½ What are spiracles, book lungs, Malpighian tubules and coxial glands? ï¿½ï¿½ï¿½ï¿½ ï¿½C.ï¿½ Input 1.ï¿½ REPRODUCTION -- The male spider gathers sperm in sacs in the pedipalps.ï¿½ As the female lays the eggs they are fertilized as they pass through the genital pore.ï¿½ The eggs are wraped in a case of silk.ï¿½ The spiders undergo their first molt inside the case.

2.ï¿½ Centipedes and millipedes are collectively called myriapods, which means "Many Feet".ï¿½ These are in the subphylum uniramia.ï¿½ the centipedes are in the class chilopoda and the millipedes are in the class diplopoda.ï¿½ The term millpede means "million feet".ï¿½ Although they have many legs they do not have a million.ï¿½ They have two pairs of legs on each body segment.ï¿½ They have round bodies.ï¿½ They will coil its body and may spray a chemical that contains cyanide.ï¿½ They are herbivores that eat plants and decayed matter in soil.

3.ï¿½ Centipedes are in the class chilopoda.ï¿½ The term centipede means "hundred feet".ï¿½ They have flattened bodies and only one pair of legs per segment.ï¿½ They can move faster than can millipedes because their legs are longer.ï¿½ They are predators and feed on earthworms cockroaches and other insects.ï¿½ the first body segment has a pair of claws that injects venom into its prey.ï¿½ ï¿½ï¿½ï¿½ï¿½ ï¿½D.ï¿½ Monitor and Adjust 1.ï¿½ Explain reproduction in the spiders. 2.ï¿½ What are myriapods? 3.ï¿½ Into what subphylum do the myriapods fall? 4.ï¿½ What class are the centipedes in? The millipedes? 5.ï¿½ Describe the centipedes.ï¿½ The millipedes.ï¿½ï¿½ ï¿½IV.ï¿½ Closure ï¿½ï¿½ï¿½ï¿½ Let's review our notes and respond ot the folowing questions.

1.ï¿½ What is the subphylum that contains spiders? 2.ï¿½ What is the major class of this subphylum? 3.ï¿½ The members of this class have how many body segments? 4.ï¿½ Members of the class arachnida have how many legs? 5.ï¿½ What do spiders feed on? 6.ï¿½ What are two ways that spiders and scorpions differ? 7.ï¿½ What is one is one disease spread by the tick? 8.ï¿½ What are spiracles, book lungs, Malpighian tubules and coxial glands? 9.ï¿½ Explain reproduction in the spiders. 10. What are myriapods? 11. Into what subphylum do the myriapods fall? 12. What class are the centipedes in? The millipedes? 13. Describe the centipedes.ï¿½ The millipedes.

Question: What arthropod's name literally means "hundred feet"?
Answer: Centipede