Crangonidae Haworth 1825
Creators: name: Wicksten, Mary K.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Crangonidae

description: Key to species of family Crangonidae   1. Pereopod 2 absent, rostrum elevated, with 4 teeth.......................................... Paracrangon echinata   
– Pereopod 2 present although sometimes very short........................................................... 2  
 2. Pereopod 2 much shorter than other pereopods, eye nearly without pigment............. Pontophilus gracilis occidentalis   
– Pereopod 2 subequal in length to other pereopods, eye with obvious pigment...................................... 3  
3. Dactyls of pereopods 4, 5 flattened, eye partially concealed by dorsal frontal margin of carapace....................... 4  
– Dactyls of pereopods 4, 5 normal, stout to slender; eye not partially concealed by dorsal frontal margin of carapace........ 5  
 4. Carapace with 2 median teeth behind anterior margin, abdominal somites 1, 2 not carinated. South of Point Conception, California................................................................................ Argis californiensis   
 – Carapace with 3–4 median teeth behind anterior margin, abdominal somites 1–4 not carinated. Shelter Cove, California northward...................................................................................... Argislevior   
 5. Carapace with 3–4 median dorsal teeth, pleura of abdominal somites 2–5 with posteroventral spines, exoskeleton heavily sculptured........................................................................... Rhynocrangon alata   
– Carapace with 0–2 median dorsal teeth, pleura of abdominal somites 5 or 6 only with posteroventral teeth if present, exoskeleton smooth or lightly sculptured.......................................................................... 6  
6. Carapace with 2 median dorsal teeth...................................................................... 7  
– Carapace with 1 or no median dorsal teeth................................................................ 15  
7. Carapace without submedian teeth........................................................................ 8  
– Carapace with submedian teeth.......................................................................... 10  
 8. Eye very large. Exoskeleton noticeably thin. Usually on lower continental shelf or deeper......... Neocrangon abyssorum   
– Eye of moderate size. Exoskeleton not noticeably thin. Usually on continental shelf............................... 9  
 9. Abdominal somite 5 with broad dorsal carina............................................. Neocrangoncommunis   
 – Abdominal somite 5 without broad dorsal carina.............................................. Neocrangon resima   
 10. Second lateral carina of carapace armed with tooth slightly behind superior lateral tooth. Small, adults 25 mm or less in total length............................................................................ Mesocrangon munitella   
– Second lateral carina of carapace not armed with tooth slightly behind superior lateral tooth. Usually larger than 25 mm in total length.............................................................................................. 11  
11. Abdominal somites 1–4 smooth......................................................................... 12  
– Abdominal somites 1–4 carinated........................................................................ 13  
 12. Anterior median tooth on carapace obliquely erect, larger than posterior, apex of former extending beyond orbital margin...................................................................................... Metacrangon acclivis   
 – Anterior median tooth on carapace not obliquely erect, not larger than posterior, apex of former well behind orbital margin....................................................................................... Metacrangon munita   
 13. Abdominal somites 1–3 laterally unarmed................................................ Metacrangon variabilis   
– Abdominal somites 1–3 laterally armed................................................................... 14  
 14. Abdominal pleura 1–3 armed laterally with one tooth each..................................... Metacrangon procax   
 – Abdominal pleura 1–3 armed laterally with two teeth each................................ Metacrangon spinosissima   
 15. Carapace without median dorsal tooth.................................................. Lissocrangon stylirostris   
– Carapace with median dorsal tooth....................................................................... 16  
16. Abdominal somite 6 with ventral sulcus.................................................................. 17  
– Abdominal somite 6 without ventral sulcus................................................................ 21  
 17. Hand of pereopods 1 very slender, 4 times as long as wide, flexed dactylus almost longitudinal...... Crangon franciscorum   
– Hand of pereopod 1 not as slender, 3.5 times as long as wide or less, flexed dactylus not forming angle less than 45˚ with propodal margin..................................................................................... 18  
 18. Abdominal somite 5 not carinate. Blade of scaphocerite with anterior margin more advanced at inner than at outer angle. Usually with large circular spot on abdominal somite 6...................................... Crangon nigromaculata   
– Abdominal somite 5 carinate. Blade of scaphocerite with anterior margin more advanced at antero-internal angle. No large circular spot on abdominal somite 6...................................................................... 19  
 19. Scaphocerite broad, short, 0.5 times as long as carapace length or less, abdominal somite 5 with weak dorsal carina................................................................................................ Crangon handi   
– Scaphocerite longer, more narrow, 0.66 times as long as carapace length or more, abdominal somite 5 with noticeable dorsal carina............................................................................................. 20  
 20. Apex of scaphocerite narrow, lateral tooth long, exceeding blade, finger of hand at about 45˚ angle to hand.................................................................................................... Crangon alaskensis   
 – Apex of scaphocerite broad, lateral tooth generally shorter, barely exceeding blade, finger of hand at about 30˚ angle to hand.................................................................................... Crangon nigricauda   
 21. Hand of pereopod 1stout, 2.25 times as long as wide, anterior margin more longitudinal than transverse. Antepenultimate segment of third maxillipeds greatly dilated......................................................... Crangon alba   
 – Hand of pereopod 1 elongate, 3 times as long as wide, anterior margin more longitudinal than transverse. Antepenultimate segment of third maxillipeds not dilated......................................................... Crangon holmesi
description: Published as part of Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, pp. 1-307 in Zootaxa 3371 on pages 107-108