Beschorneria is a genus of succulent plants belonging to the family Asparagaceae, subfamily Agavoideae, native to semi-arid areas of Mexico and Central America.
 They are generally large evergreen perennials forming clumps of grey-green leaves, with tall flower-spikes to 1.5 m .
 Marginally hardy, they may require winter protection in areas subject to frost.
Petals are modified leaves that surround the reproductive parts of flowers.
 They are often brightly colored or unusually shaped to attract pollinators. Together, all of the petals of a flower are called a corolla.
 Petals are usually accompanied by another set of special leaves called sepals, that collectively form the "calyx" and lie just beneath the corolla.
 The calyx and the corolla together make up the perianth.
 When the petals and sepals of a flower are difficult to distinguish, they are collectively called tepals. Examples of plants in which the term "tepal" is appropriate include genera such as "Aloe" and "Tulipa".
 Conversely, genera such as "Rosa" and "Phaseolus" have well-distinguished sepals and petals.
 When the undifferentiated tepals resemble petals, they are referred to as "petaloid", as in petaloid monocots, orders of monocots with brightly coloured tepals.
 Since they include Liliales, an alternative name is lilioid monocots.
A number of lineages of crabs have evolved to live predominantly on land.
 Examples of terrestrial crabs are found in the families Gecarcinidae and Gecarcinucidae, as well as in selected genera from other families, such as "Sesarma", although the term "land crab" is often used to mean solely the family Gecarcinidae.
Edmontosaurus annectens is a species of flat-headed or saurolophine hadrosaurid ornithopod dinosaur (a "duck-billed dinosaur") from the very end of the Cretaceous Period, in what is now North America.
 Remains of "E. annectens" have been preserved in the Frenchman, Hell Creek, and Lance Formations. All of these formations are dated to the late Maastrichtian stage of the Late Cretaceous Period, representing the last three million years before the extinction of the dinosaurs (between 67 and 66 million years ago).
 "Edmontosaurus annectens" is known from numerous specimens, including at least twenty partial to complete skulls, discovered in the U.S. states of Montana, South Dakota, North Dakota and Wyoming, Colorado and the Canadian province of Saskatchewan.
 It was a large animal, up to approximately 12 m , potentially up to 15 m in length, with an extremely long and low skull.
 "E. annectens" exhibits one of the most striking examples of the "duckbill" snout common to hadrosaurs.
 It has a long taxonomic history, and specimens have at times been classified in the genera "Diclonius", "Trachodon", "Hadrosaurus", "Claosaurus", "Thespesius", "Anatosaurus", and "Anatotitan", before being grouped together in "Edmontosaurus".
A neck frill is the relatively extensive margin seen on the back of the heads of reptiles with either a bony support such as those present on the skulls of dinosaurs of the suborder Marginocephalia or a cartilaginous one as in the frill-necked lizard.
 In technical terms, the bone-supported frill is composed of an enlarged parietal bone flanked by elongated squamosals and sometimes ringed by epoccipitals, bony knobs that gave the margin a jagged appearance.
 In the early 1900s, the parietal bone was known among paleontologists as the dermosupraoccipital.
 In some genera, such as "Triceratops", "Pentaceratops", "Centrosaurus" and "Torosaurus", this extension is very large.
 Despite the neck frill predominantly being made of hard bone, some neck frills are made of skin, as is the case with the frill-necked lizard of today that resides in Australia.
 The use of the neck frill in dinosaurs is uncertain; it may have been used for thermoregulation or simply as a defense mechanism.
 Indeed, during battles for territory, competing "Triceratops" crashed heads together with their elongated horns and the neck frill may have been employed as a kind of shield, protecting the rest of the animal from harm.
 However, usage of the neck frill in modern reptiles is better documented.
 Two chief and disparate examples are the horned lizards (genus "Phrynosoma") with a bony frill, and the frill-necked lizard (genus "Chlamydosaurus") with a cartilaginous frill.
 The frill-necked lizard's frill is mainly made up of flaps of skin, which are usually coloured pink, supported by cartilaginous spines.
 Similar to the portrayal of the dinosaur "Dilophosaurus" in Steven Spielberg's "Jurassic Park", frill-necked lizard puff out these neck frills on either side of its head when threatened.
 The lizards often raise their frills when battling for territory or when coming into contact with another lizard, especially during mating season.
 There is, however, no evidence that suggests that "Dilophosaurus" neither had nor didn't have the same abilities, as many of its features in the "Jurassic Park" film were mostly fictional.
Aglaia is a genus of more than 390 species belonging to the Mahogany family (Meliaceae).
A very large number of rheophilic fish species are known and include members of at least 419 genera in 60 families.
 Examples include:
Many species of flies of the two-winged type, Order Diptera, such as mosquitoes, horse-flies, blow-flies and warble-flies cause direct parasitic disease to domestic animals, and transmit organisms that cause diseases.
 These infestations and infections cause distress to companion animals, and in livestock industry the financial costs of these diseases are high.
 These problems occur wherever domestic animals are reared.
 This article provides an overview of parasitic flies from a veterinary perspective, with emphasis on the disease causing relationships between these flies and their host animals.
 The article is organized following the taxonomic hierarchy of these flies in the Phylum Arthropoda, Order Insecta.
 Families and genera of dipteran flies are emphasized rather than many individual species.
 Disease caused by the feeding activity of the flies is described here under Parasitic disease.
 Disease caused by small pathogenic organisms that pass from the flies to domestic animals is described here under Transmitted organisms; prominent examples are provided from the many species.
Cassytha is a genus of some two dozen species of obligately parasitic vines in the family Lauraceae.
 Superficially, and in some aspects of their ecology, they closely resemble plants in the unrelated genus "Cuscuta", the dodders.
 When fruit and flowers are absent in the field, the physical resemblance is so close that few people without technical training can tell them apart.
 In this respect and in their ecology the two genera present a spectacular example of convergent evolution.
 In its divergence from habits typical of the Lauraceae, "Cassytha" also presents examples of mosaic evolution
The Pinophyta, also known as Coniferophyta or Coniferae, or commonly as conifers, are a division of vascular land plants containing a single class, Pinopsida.
 They are gymnosperms, cone-bearing seed plants. All extant conifers are perennial woody plants with secondary growth.
 The great majority are trees, though a few are shrubs. Examples include cedars, Douglas firs, cypresses, firs, junipers, kauri, larches, pines, hemlocks, redwoods, spruces, and yews.
 As of 1998, the division Pinophyta was estimated to contain eight families, 68 genera, and 629 living species.

Question: Are both Beschorneria and Aglaia examples of genera?
Answer: yes