Anomura

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 142

Key to families of Anomura

1. Abdomen soft, elongate. Inhabiting shells or tubes........................................................... 2

– Abdomen usually not soft, if so, rounded, not elongate. Not inhabiting shells or tubes.............................. 4

2. Outer maxillipeds close together at base, chelipeds subequal.......................................... Diogenidae

– Outer maxillipeds separated by the width of one maxilliped at least at base, chelipeds not equal in size, shape............ 3

3. Toothed ridge of outer maxilliped with 1 or more accessory teeth, female with gonopore on both third pereopods. Intertidal or deeper....................................................................................... Paguridae

– Toothed ridge of outer maxilliped without accessory teeth, female with gonopore on left third pereopod only. Continental shelf, slope.................................................................................... Parapaguridae

4. Body somewhat egg-shaped to rectangular, highly modified for digging.......................................... 5

– Body not egg-shaped to rectangular, not modified for digging................................................... 7

5. Pereopods 1 without chelae, telson elongate, spearhead-shaped........................................... Hippidae

– Pereopods 1 with chelae, telson small, somewhat circular to ovate............................................... 6

6. Eyestalks elongate ovoid, with pigmented corneae............................................... Blepharipodidae

– Eyestalks squarish, corneae without pigment....................................................... Albuneidae

7. Abdomen tightly flexed beneath abdomen, soft to calcified but incapable of being used in swimming, not lobster-like; uropods absent.............................................................................................. 8

– Abdomen loosely flexed beneath abdomen, lightly calcified, capable of being used in swimming, may be lobster-like; uropods present............................................................................................. 9

8. Abdomen soft, uncalcified. Intertidal to shallow subtidal zones, not found at depths of more than 165 m. .. Hapalogasteridae

– Abdomen at least partially calcified but may have membranous sutures. Intertidal zone to continental slopes at greater than 165 m. ......................................................................................... Lithodidae

9. Abdomen not lobster-like, folded against cephalothorax, pereopods 1 heavy, not elongate.................. Porcellanidae

– Abdomen lobster-like but short, not folded against cephalothorax, pereopods 1 slender, elongate..................... 10

10. Third maxilliped without epipod. Telson folded beneath preceding abdominal somites. Continental slopes, usually living on colonial anthozoans.......................................................................... Chirostylidae

– Third maxilliped with epipod. Telson not folded beneath preceding abdominal somites. Surface waters to abyssal plains, various substrata........................................................................................ 11

11. Front broad, triangular......................................................................... Galatheidae

– Front not broad or triangular, composed of slender rostrum flanked by supraorbital spines........................... 12

12. First maxilliped without flagellum or flagellum strongly reduced. Cornea of eye without pigment. Usually found at 200 m or deeper................................................................................... Munidopsidae

– First maxilliped with well-developed flagellum. Cornea of eye pigmented. Usually at surface to 200 m. ......... Munididae