Oncopagurus gracilis ( Henderson, 1888 )

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 : 252-253

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

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Oncopagurus gracilis ( Henderson, 1888 )


Oncopagurus gracilis ( Henderson, 1888) View in CoL

Figs. 25A–J View Fig , 51 View Fig

Eupagurus bicristatus A. Milne-Edwards, 1880: 43 (in part, see Remarks).

Parapagurus gracilis Henderson, 1888: 92 View in CoL , pl. 10, fig. 3 (type locality: off Pernambuco, Brazil, HMS Challenger, sta 122, 09°05'S, 34°50'W); Rieger, 1998: 413.

Sympagurus arcuatus A. Milne-Edwards & Bouvier, 1893: 67 View in CoL , pl. 5, figs 21–28 (type locality: St. Lucia, Caribbean Sea , USCGS Blake, sta 218, 13°49.12'N, 61°04.40'S).

Pylopagurus exquisitus Boone, 1927: 71 , fig. 14 (type locality: Pawnee I, N of Glover Reef , off the coast of British Honduras [= Belize])

Parapagurus bicristatus gracilis – de Saint Laurent, 1972: 112; Coelho & Ramos-Porto, 1987: 38.

Sympagurus gracilis – Lemaitre, 1989: 64, figs 32–35, 40C; Melo, 1999: 156, figs 95, 96.

Parapagurus arcuatus View in CoL – Williams et al., 1989: 32.

Oncopagurus gracilis View in CoL – Lemaitre, 1996: 194; McLaughlin et al., 2005: 246; Coelho et al., 2007: 10 (Table 1); Felder et al., 2009: 1071; McLaughlin et al., 2010: 39; Campos et al., 2005: 139, figs. 99, 100; Martínez Campos et al., 2012: 240.

(For complete synonymy see Lemaitre, 1989)

Type material. Lectotype designated by Lemaitre (1989): M 2.8 mm, off Pernambuco, Brazil, HMS Challenger , sta 122, 09°05'S, 34°50'W, 630 m, 10 September 1883 ( BMNH 1888 : 33). GoogleMaps

Holotype of Sympagurus arcuatus A. Milne-Edwards & Bouvier, 1893 : ov F 2.6 mm, off St. Lucia, Caribbean Sea , USCGS Blake, sta 218, 13°49.12'N, 61°04.40'S, 295 m, 15 February 1879 ( MCZ 6330 View Materials ).

Additional material. est Africa : Atlantide Expedition, sta 135, 07°55'S, 12°33'E, off Angola, 235–460 m, 17 March 1946: 1 M 4.5 mm ( ZMK) GoogleMaps .

For additional material see Lemaitre (1989, as Sympagurus gracilis ).

Diagnosis. Shield ( Fig. 25A View Fig ) about as broad as long; rostrum broadly rounded, weakly produced to obsolete, with short mid-dorsal ridge; lateral projections subtriangular, slightly in advance of rostrum, often terminating in small spine. Ocular peduncles usually more than half length of shield, with dorsal row of setae; corneas weakly dilated. Ocular acicles subtriangular, terminating in strong spine. Antennular peduncle ( Fig. 25A View Fig ) exceeding distal margin of cornea by nearly entire length of ultimate segment. Antennal peduncle ( Fig. 25A View Fig ) not exceeding distal margin of cornea; fourth segment with small spine on dorsolateral distal angle; second segment with dorsolateral distal angle terminating in strong, simple or multifid spine, mesial margin with spine on dorsodistal angle; first segment with small spine on lateral face; acicles weakly curved (in dorsal view), usually not exceeding distal margin of corneas, terminating in strong spine, mesial margin armed with row of 7–11 spines each set at about 45° angle to longitudinal axis of acicle; flagellum exceeding extended right cheliped, with series of 2 or or 3 long setae 4–8 articles in length every 10–20 articles. Third maxilliped with crista dentata of about 10 teeth, proximal 2 or 3 teeth usually larger than distal. Right cheliped ( Fig. 25B–E View Fig ) with moderately dense, simple and plumose setae, chela operculate, proportions and armature of chela, and carpus strongly influenced by size and sexual dimorphism; dactyl set at strongly oblique angle to longitudinal axis of palm; palm varying from broader than long to longer than broad, dorsal face with irregular rows of scattered small tubercles or spines medially, dorsolateral and dorsomesial margins well delimited by row of blunt to sharp spines, mesial face strongly sloping, ventromesial face rounded, ventral face smooth; carpus 1.3–1.8 times as long as broad, dorsolateral margin usually well delimited by row of spines at least distally, dorsal face with numerous, well-spaced small spines or tubercles. Left cheliped usually weakly well calcified on dorsolateral face of carpus; palm unarmed except for dorsomesial row of small spines and long setae on dorsomesial margin; carpus with strong dorsodistal spine and long setae dorsally. Ambulatory legs with dactyls ( Fig. 25F View Fig ) each having ventromesial row of about 3–9 corneous spinules; carpus with small dorsodistal spine. Anterior lobe of sternite XII (between second ambulatory legs) rounded, setose, with 1 or 2 subterminal spines. Fourth pereopod propodal rasp ( Fig. 25G View Fig ) with 1 row of rounded scales at least distally. Fifth pereopod propodal rasp extending to or beyond mid-length of segment. Uropods and telson markedly asymmetrical; telson ( Fig. 25H View Fig ) lacking or with obsolete transverse suture, posterior lobes separated by shallow V-shaped cleft, terminal margin of lobes armed with often strongly curved corneous spines. Male with paired first and second gonopods ( Fig. 25I, J View Fig ), small individuals (sl <1.6 mm) often lacking first gonopods; first gonopods with ovate distal lobe, marginally setose; second gonopods with distal segment spatulate and with setae distally. Female with vestigial second right pleopod.

Variations. See Lemaitre (1989, as Sympagurus gracilis )

Colouration. Unknown.

Habitat. Gastropod shells frequently with one or more anthozoan polyps (actinians or zoanthids) attached.

Distribution. Western Atlantic, from the Straits of Florida and Gulf of Mexico to off Pernambuco, Brazil. Eastern Atlantic, form Gulf of Guinea and off Angola. Depth 146– 634 m.

Remarks. (See also Oncopagurus africanus and O. bicristatus ). As discussed by Lemaitre (1989), one of the two type specimens used to describe Eupagurus bicristatus A. Milne Edwards, 1880 (= Oncopagurus bicristatus ) was also used by A. Milne-Edwards & Bouvier (1893) to describe Sympagurus arcuatus . That taxon and Pylopagurus exquisitus Boone, 1927 , were shown by Lemaitre (1989) to be junior synonyms of Parapagurus gracilis Henderson, 1888 (= O. gracilis ).

Oncopagurus gracilis and O. bicristatus are the only two species of Oncopagurus that occur in the western Atlantic, where they occur sympatrically. Both also range to the eastern Atlantic. In the eastern Atlantic, O. gracilis has been found in the Gulf of Guinea and off Angola. Oncopagurus gracilis differs from O. bicristatus in the shape of the right palm, armature of antennal acicles, and in males, degree of development of the first and second gonopods. In O. gracilis , the ventromesial face of the right palm is rounded, whereas in O. bicristatus there is a distinct, spinose ventromesial margin. In O. gracilis , the spines on the mesial margin of the antennal acicle are set at about a 45° angle with the longitudinal axis of the acile, whereas in O. bicristatus the spines are set at nearly 90° angle. The first and second gonopods in O. gracilis are fairly well developed for a species of Oncopagurus , whereas in O. bicristatus the first gonopods are reduced to short buds and the second gonopods are either poorly developed or asymmetrical.


Zoologisches Museum der Universitaet Kiel














Oncopagurus gracilis ( Henderson, 1888 )

Lemaitre, Rafael 2014

Oncopagurus gracilis

Martinez Campos B & Campos NH & Bermudez Tobon A 2012: 240
McLaughlin PA & Komai T & Lemaitre R & Rahayu DL 2010: 39
Felder DL & Alvarez F & Goy JW & Lemaitre R 2009: 1071
McLaughlin PA & Camp DK & Eldredge LG & Goy JW & Felder DL & Hobbs III HH & Kensley B & Lemaitre R & Martin JW 2005: 246
Campos CNH & Navas SGR & Bermudez TA & Cruz CN 2005: 139
Lemaitre R 1996: 194

Sympagurus gracilis

Melo GAS 1999: 156
Lemaitre R 1989: 64

Parapagurus arcuatus

Williams AB & Abele LG & Felder DL & Hobbs Jr H & Manning RB & McLaughlin PA & Perez-Farfante I 1989: 32

Parapagurus bicristatus gracilis

Coelho PA & Ramos-Porto M 1987: 38
de Saint Laurent M 1972: 112

Pylopagurus exquisitus

Boone L 1927: 71

Sympagurus arcuatus A. Milne-Edwards & Bouvier, 1893: 67

Milne-Edwards A & Bouvier E-L 1893: 67

Parapagurus gracilis

Rieger PJ 1998: 413
Henderson JR 1888: 92

Eupagurus bicristatus A. Milne-Edwards, 1880: 43

Milne-Edwards A 1880: 43
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