Oncopagurus, Lemaitre, 1996

Lemaitre, Rafael, 2014, A worldwide taxonomic and distributional synthesis of the genus Oncopagurus Lemaitre, 1996 (Crustacea: Decapoda: Anomura: Parapaguridae), with descriptions of nine new species, Raffles Bulletin of Zoology 62, pp. 210-301 : 213-214

publication ID

https://doi.org/ 10.5281/zenodo.5458372

publication LSID

lsid:zoobank.org:pub:08BE1873-6F6F-4255-9520-9A89F48E4F16

persistent identifier

https://treatment.plazi.org/id/8C6A8943-FFF8-7873-FCA8-FD47FA77FD9E

treatment provided by

Tatiana

scientific name

Oncopagurus
status

 

Key to the Indo-West Pacific species of Oncopagurus View in CoL *

[* Oncopagurus sp. A , reported by Zhadan (1997), excluded from key]

1. Cornea subconical or reduced (width no greater than distal width of ocular peduncle).......................................................2

– Cornea not subconical or reduced (width greater than distal width of ocular peduncle).......................................................5

2. Cornea distally rounded; uropods and telson distinctly asymmetrical; right chela operculate......................................3

– Cornea distally acute, usually sharply so ( Fig. 10L View Fig ); uropods and telson symmetrical; right chela not operculate ................. ................................................................................. O. conicus View in CoL

3. Antennal acicle short, not exceeding distal margin of corneas or at most exceeding distal margin by 0.2 length of acicle (in O. elongatus , new species); right cheliped with chela relatively broad (length/width no more than 1.3)...................................4

– Antennal acicle long, exceeding distal margin of cornea by nearly half length of acicle ( Fig. 31A View Fig ); right cheliped with chela relatively slender (length/width distinctly more than 1.3)....... ............................................................. O. petilus , new species

4. Right cheliped sexually dimorphic (in females, palm with mesial face expanded distomesially, and ventromesial margin well delimited by row of spines; in males, palm with mesial face not expanded distally, and ventromesial margin at most weakly delimited by small tubercles; Fig. 22A–D View Fig ); dactyl of fourth pereopod long and slender, 1.8–2.5 times as long as dorsal margin of propodus, sexually dimorphic, longer and slenderer in females than in males ( Fig. 23E, F View Fig ); gills biserial to weakly quadriserial. ................... O. elongatus , new species

– Right cheliped not sexually dimorphic (in both sexes, palm with mesial face not expanded distomesially, and ventromesial margin of palm not well delimited; Fig. 27C, D View Fig ); dactyl of fourth pereopod short, no more than 1.5 times as long as dorsal margin of propodus, not sexually dimorphic; gills biserial..... ................................................................................. O. minutus View in CoL

5. Antennal acicle not exceeding distal margin of cornea (at most reaching to about mid-portion of cornea)...............................6

– Antennal acicle reaching to or slightly exceeding distal margin of cornea................................................................................12

6. Ventral surface of right chela with tuberculate ridges or cluster of tubercles on ventral surface of palm, and distinct tuberculate longitudinal ridges on fixed finger and dactyl.......................7

– Ventral surface of right chela unarmed, smooth or at most with scattered small tubercles, lacking ridges or tubercles on palm or distinct ridges on fixed finger and dactyl..........................8

7. Ventral surface of palm of right chela with distinct median cluster of tubercles ( Fig. 24D, E View Fig ); ocular acicles each terminating in submarginal spine ( Fig. 24B View Fig )................................. O. glebosus View in CoL

– Ventral surface of palm of right chela without median cluster of tubercles, instead with median longitudinal tuberculate or spinose ridges continued on fixed finger and towards mesiodistal angle, forming Y-shape ( Fig. 40B View Fig ); ocular acicles each terminating in simple spine (not submarginal)................ ......................................................... O. rossanae , new species

8. Epistomial spine bifid ( Fig. 2C View Fig ); telson sexually dimorphic (terminal margins of lobes armed with slender, corneous spines stronger and more numerous in females than in males, and extending to midportion of left lateral margin; in females, left lobe armed with 16–20 long and short spines, of which 2 or 3 are strong and curved or bent at nearly right angle; Fig. 5D, E View Fig ). ........................................................ O. bifidus , new species

– Epistomial spine simple; telson not sexually dimorphic.......9

9. Palm of right cheliped with distomesial angle mesially not expanded or thumb-like........................................................10

– Palm of right cheliped with distomesial angle mesially expanded, thumb-like ( Fig. 36A, B View Fig ). .................. O. pollicis , new species

10. Carpi and propodi of ambulatory legs armed on dorsal margin with row of small spines ( Fig. 45A–C View Fig ).................................... ........................................................ O. spiniartus , new species

– Carpi and propodi of ambulatory legs unarmed on dorsal margin except for small dorsodistal spine on carpi..........................11

11. Merus of right cheliped with thick, yellow bristle-like setae on dorsal margin ( Fig. 8A, E View Fig ); male lacking first gonopods, and with poorly developed, asymmetrical second gonopods ( Fig. 6F, G View Fig ).................................................... O. brevis , new species

– Merus of right cheliped without thick bristle-like setae on dorsal margin; male with first gonopods, and symmetrical second gonopods.............................................................. O. curvispina View in CoL

12. Ocular acicles multifid or occasionally bifid ( Fig. 30A View Fig ). ........ .............................................................................. O. orientalis View in CoL

– Ocular acicles simple............................................................13

13. Propodal rasp of fourth pereopod with 1 row of ovate scales................................................................................................14

– Propodal rasp of fourth pereopod with 2 rows of ovate scales ( Fig. 49E View Fig )............................................................. O. stockmani View in CoL

14. Palm of right cheliped with ventromesial face normally rounded, not elevated as broad, rounded ridge, and ventral face smooth or with scattered tubercles....................................................15

– Palm of right cheliped with ventromesial face elevated as broad, rounded tuberculate ridge projecting distally near base of dactyl, and ventral face with raised cluster of small blunt spines ( Fig. 18C–E View Fig )........................... O. elevatus , new species

15. Palm of right cheliped with ventromesial margin distinctly delimited by row of spines, more so in females than in males......................................................................................16

– Palm of right cheliped with ventromesial margin rounded, not distinctly delimited in either sex...........................................17

16. Antennal flagellum with numerous long setae 1–3 flagellar articles in length; right cheliped not sexually dimorphic (in both sexes, palm with mesial face expanded distomesially ( Fig. 50B, C View Fig ), and ventromesial margin well delimited by row of spines), and row of strong spines on dorsodistal margin of carpus; males lacking first gonopods and with asymmetrical second gonopods .................................................... O. tuamotu View in CoL

– Antennal flagellum with scattered short setae less than 1 flagellar article in length; right cheliped sexually dimorphic (in females, palm with mesial face expanded distomesially, and ventromesial margin well delimited by row of spines; in males, palm with mesial face not expanded distally, and ventromesial margin weakly delimited), and weakly armed dorsodistal margin of carpus; males with first gonopods, and symmetrical second gonopods................................................................... O. indicus View in CoL

17. Cornea not dilated; males lacking first gonopods, second gonopods reduced or vestigial; maximum size relatively small (sl <3 mm)............................................................................18

– Cornea dilated ( Fig. 28A View Fig ); males with first and second gonopods ( Fig. 28K, L View Fig ); maximum size relatively large (shield length up to 6 mm or more)............................................... O monstrosus View in CoL

18. Antennal peduncle at most reaching to distal margin of cornea; dactyl of fourth pereopods sexually dimorphic, distinctly slenderer and more strongly curved (hook-like) in females than in males ( Fig. 10E, F View Fig ); second gonopods reduced (1- or 2-segmented, occasionally absent on right side; Fig. 10H, I View Fig ). .................................................................................. O. cidaris View in CoL

– Antennal peduncle exceeding distal margin of cornea by 0.3 length of fifth segment; dactyl of fourth pereopods not sexually dimorphic ( Fig. 29G View Fig ); second gonopods vestigial (bud-like or very short segment; Fig. 29I, J View Fig )................................. O. oimos View in CoL

Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF