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

Genus Oncopagurus Lemaitre, 1996

Sympagurus – Lemaitre, 1989: 36 (in part, see Remarks).

Oncopagurus Lemaitre, 1996: 194 ; Lemaitre, 2000: 217; Davie, 2002: 88; Poore 2004: 282; De Grave et al., 2009: 26; McLaughlin, 2003: 118 (key); Poore, 2004: 281; Asakura et al., 2006: 215; McLaughlin et al., 2007: 307; McLaughlin et al., 2010: 38.

Type species. Eupagurus bicristatus A. Milne-Edwards, 1880 , by original designation. Gender: masculine.

Diagnosis. Eleven pairs of biserial or rarely (1 species: O. elongatus ) quadriserial phyllobranchiate gills. Shield about as broad as long; dorsal surface usually weakly calcified medially. Corneas usually weakly to moderately dilated, or less frequently reduced or subconical. Fourth segment of antennal peduncle armed with dorsodistal spine. Epistomial spine strongly curved upward (e.g., Fig. 16D ), rarely bifid ( Fig. 2C ). Maxillule with internal lobe having long, terminal seta. Right chela operculate, with well delimited dorsolateral margin, or not operculate (1 species: O. conicus Lemaitre, 2006 ) with weakly defined dorsolateral margin. Left cheliped with carpus and palm frequently with weakly calcified areas dorsally. Ambulatory legs with dactyls broadly curved. Fourth pereopod with propodal rasp consisting of 1 row, or rarely 2 rows (1 species: O. stockmani ), of corneous scales. Second pleonal somite with left pleuron terminating ventrally in small subtriangular lobe. Males with poorly to moderately developed paired first and second gonopods; first gonopods sometimes absent, or if present each with weakly concave distal lobe; second gonopods 1- or 2-segmented, sometimes asymmetric in size and number of segments, or absent on one side. Female usually with vestigial second right pleopod.

Habtitat. Typically found in gastropod shells, occasionally with coelenterates (actinian, zoanthid, or hydractinian) living on the shell.

Distribution. Indian Ocean; western, central, south and eastern Pacific Ocean; western and eastern Atlantic Ocean. Depth: 50–2308 m.

Species. Twenty-four species (see list).

Remarks. In his revision of Parapagurus sensu lato, Lemaitre (1989) resurrected the genus Sympagurus for 30 species (with one species divided into three subspecies) that had been assigned to Parapagurus by de Saint Laurent (1972). Ten of those 30 species were subsequently placed by Lemaitre (1996) in his genus Oncopagurus .All other taxa assigned by Lemaitre (1989) to Sympagurus have now been reassigned to other parapagurid genera ( Lemaitre, 1993, 2004a, b, 2013; Osawa, 1995, 1996).

Figures

Fig. 16. Oncopagurus elevatus, new species, New Caledonia: A–I, holotype, male 3.8 mm, SMIB 3, sta DW 1 (MNHN-IU-2013-5515); H, paratype, male 3.2 mm, CHALCAL 2, sta DW 72 (MNHN-IU-2013-5516).A, shield and cephalic appendages, dorsal; B, right ocular acicle, lateral; C, right antennal peduncle, lateral; D, epistome, laterodorsal; E, anterior and posterior lobes of thoracic sternite XII (between second ambulatory legs), ventral; F, exopod of left uropod, dorsal; G, telson, dorsal; H, left first gonopod, mesial; I, left second gonopod, anterior. Scale bars = 1 mm (A); 0.25 mm (B, D, H, I); 0.5 mm (C, E–G).

Fig. 2. Oncopagurus bifidus, new species, Philippines: A–F, holotype, male 3.4 mm, MUSORSTOM 3, sta CP 96 (MNHN-IU-2013-5584, ex MNHN Pg 7569); G, paratype, ov female 2.8 mm, same sta (MNHN-IU-2013-5583, ex MNHN Pg 7569); H, paratype, male 2.4 mm, sta CP 72 (MNHN-IU-2013-5491, ex MNHN Pg 7577). A, shield and cephalic appendages, dorsal; B, right antennal peduncle, lateral; C, epistome, laterodorsal; D, right cheliped of male, dorsal; E, right cheliped of female, dorsal; F, chela of same, mesial; G, left cheliped, dorsal; H, left second gonopod, lateral. Scale bars = 1 mm (A, D–G); 0.5 mm (B); 0.25 mm (C).