Paguroidea, Latreille, 1802

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 172

Key to species of Paguroidea

1. Outer maxillipeds approximated at their bases; chelipeds equal or subequal in size...................... 2 ( Diogenidae )

– Outer maxillipeds widely separated at their bases; right cheliped larger than left.................................... 7

2. Pereopod 4 subchelate, no paired pleopods in either sex. Often buried in sand........................ Isocheles pilosus

– Pereopod 4 simple, paired pleopods in both sexes. Living in sand or among rocks, usually not buried................... 3

3. Dorsal surface of palms of chelae coarsely granulated, and bearing fluffy clusters of short plumose setae.. Paguristes parvus

– Dorsal surface of palms of chelae with large conical tubercles, each tipped with dark corneous spine; chelae bearing many long stiff simple setae...................................................................................... 4

4. Rostrum about as long as lateral frontal projections of carapace; antennal flagellum with short, wide-set hairs on lower surface .................................................................................................... 5

– Rostrum longer than lateral frontal projections of carapace; antennal flagellum with long, close-set hairs on lower surface.. 6

5. Chelae very broad, their dorsomesial margin strongly convex.................................... Paguristes bakeri

– Chelae relatively narrow, dorsomesial margin not strongly convex................................ Paguristes turgidus

6. Rostrum broad at base, reaching about to base of eyecales; propodus, dactyl pereopods 2, 3 with small, dark corneous spines on inner surface.......................................................................... Paguristes ulreyi

– Rostrum slender, narrow at base, apex reaching beyond base of eyecales; propodus, dactyl of pereopods 2, 3 unarmed on inner surface ... Paguristes undescribed species

7. Crista dentata of outer maxillipeds with 1 or more accessory teeth, first maxilliped exopod with flagellum, female with gonopore on coxa of both third pereopods. (Intertidal zone to continental slopes, common)...................... 8 ( Paguridae )

– Crista dentata of outer maxillipeds lacking accessory tooth, first maxilliped exopod without flagellum, female with gonopore on coxa of left third pereopod only. (Continental shelf to abyssal plains)........................... 38 ( Parapaguridae )

8. Telson with posterior margin entire, lacking lobes, median cleft................................................. 9

– Telson divided into lobes posteriorly..................................................................... 10

9. Telson unarmed terminally, uropods asymmetrical.................................... Enallopaguropsis guatemoci

– Telson with terminal spines; uropods symmetrical....................................... Discorsopagurus schmitti

10. Propodial rasp of pereopod 4 a single row................................................................. 11

– Propodial rasp of pereopod 4 with multiple scale rows....................................................... 13

11. Abdomen straight; uropods symmetrical.................................................. Pylopagurus holmesi

– Abdomen coiled; uropods asymmetrical................................................................... 12

12. Major chela discoid, dorsal surface of palm convex, bearing many low boss-like tubercles; dactyl with raised ridge on dorsal face; pereopod 4 with preungual process.............................................. Phimochirus californiensis

– Major chela subquadrate, dorsal surface of palm slightly concave, with raised margins, scattered slender tubercles; dactyl without facial ridge, but bearing proximal tubercle row on dorsal face; pereopod 4 lacking preungual process... Haigia diegensis

13. Abdomen straight, uropods symmetrical. Often inhabiting tubes or tubular shells................. Orthopagurus minimus

– Abdomen coiled, uropods asymmetrical.................................................................. 14

14. Male with short sexual tube on coxa of pereopod 5.......................................................... 15

– Male without sexual tube on coxa of pereopod 5 except Pagurus aleuticus male.................................. 18

15. Dactyls of pereopods with pronounced lateral sulcus..................................... Pagurus aleuticus female