Stenocionops coelatus ( A. Milne-Edwards, 1878 )

Colavite, Jessica, Santana, William & Tavares, Marcos, 2016, Morphological differences between Stenocionops furcatus (Olivier, 1791) and S. coelatus (A. Milne-Edwards, 1878) (Crustacea, Decapoda, Brachyura, Majoidea), Zootaxa 4184 (3), pp. 517-528 : 518-520

Stenocionops coelatus ( A. Milne-Edwards, 1878)

( Figs. 1 A, C , E; 2 A, C, D)

Pericera coelata A. Milne-Edwards, 1878: 224 [type locality: 16 miles from Holbox Islands (“Idolos” erroneously), Yucatan, Mexico, 14 fathoms, (MCZ 2848)].

Pericera coelata —A. Milne-Edwards, 1879: 200, pl. 15A, figs. 3–3b; 1881: 1; Miers, 1879: 664; 1886: 76.

Pericera cornuta coelata — Rathbun, 1892: 244, Nutting, 1895: 123.

Stenocionops furcata coelata — Rathbun, 1901: 73; 1925: 450, pl. 164; 1933: 34; Hay & Shore, 1918: 460, pl. 39, fig. 3; Williams, 1965: 261, figs. 241, 245H; 1984: 338, figs. 273, 275i; Felder, 1973: 53; Powers, 1977: 59; Markham & McDermott 1980: 1273; Abele & Kim, 1986: 49, 507, 543 figs. b–c; Rodríguez, 1980: 29, pl. 27, Vázquez-Bader & Gracia, 1994: 82; Marcano & Bolaños, 2001: 79; Nizinski, 2003: 131.

Stenocionops coelata — A. Milne-Edwards & Bouvier, 1923: 393.

Stenocionops furcatus coelatus — Laughlin et al., 1984: 202 –208; Bullard, 2003: 27, fig. 18.

Stenocionops coelatus —Ng et al., 2008: 120; Lira et al., 2013: 55.

Type locality. Sixteen miles north of Holbox Island, Yucatan, Mexico.

Geographical distribution. From Beaufort, North Carolina, to northwest Florida and Alabama; Gulf of Mexico and Yucatan Chanel; West Indies, Barbados ( Rathbun, 1925; Williams, 1984).

Material examined. USA, off North Carolina, 33o48’36" N, 76o34’06" W, 04.iii.1981, Duke University coll., 69 m, 2 juveniles ( USNM 209726 ) . South Carolina, Dolphin , 33o14’88”N, 78o24’12”W, 27.ix.1979, ¾ yankee trawl, E. Wenner det., 24 m, 2 juveniles ( USNM 188715 ) . South Carolina, Silver Bay , stn. 1751, 32°24’N – 78°57’W, 08.iii.1960, D.J. Griffin & H.B. Roberts det., 73 m, 1 male (USNM 1256405) . Georgia, off coast, MARMAP expedition, Dolphin , stn. 790469, 31o40’54”N, 80o16’W, 01.v.1979, ¾ yankee trawl, E. Wenner det., 28 m, 1 female ( USNM 186465 ) . Georgia, Silver Bay , stn. 5708, 30°56’N – 80°01.5’W, 07.v.1964, W. Santana det., 62– 64 m, 2 males, 2 females ( USNM 1256363 ) . Gulf of Mexico , off Luisiana, Tim Taq Expedition, Oregon II, stn. 14927, 28°41’N – 90°27’W, 07.vi.1974, F. A. Chace det., 20 m, 1 male ( USNM 93678 ) . Gulf of Mexico , off Florida, 25o17’16”N, 82o52’10”W, 26.iv.1981, Continental Shelf Associates for MMS coll., R. Lemaitre det., 0–44 m, 12 juveniles ( USNM 243068 ) . Gulf of Mexico, off Florida, 25o17’16”N, 82o52’10”W, 26.iv.1981, Continental Shelf Association for MMS coll., R. Lemaitre det., 0–44 m, 3 juveniles ( USNM 243069 ) . Mexico, Yucatan, 16 miles north of Holbox Island, Blake Expedition , stn. 39, 25 m, 20.ii.1878, A. Agassiz coll., female lectotype, cl 27.0 mm, cw 16.0 mm ( MCZ 2848 ) . Cuba, off Havana, Blake Expeditions , stn. 79, 137 m, iii.1878, A. Agassiz coll., female juvenile paralectotype, cl 27.5 mm, cw 37.5 mm ( MCZ 2847 ) .

Remarks. A. Milne-Edwards described Pericera coelata ( A. Milne-Edwards, 1878: 224) based on two young females syntypes obtained from 10 meters deep off Idolos Island (îles Idolos) and near Havana, Cuba (MCZ 2848 and MCZ 2847, respectively). A. Milne-Edwards provided measurements for the female MCZ 2848 (cl 36 mm including rostrum, cw 27 mm); that female is herein designated as the lectotype of S. coelatus (cf. ICNZ, Art. 73.2.2. Recommendation 74F]. Therefore, the female MCZ 2847 is the paralectotype.

With the designation of the lectotype of S. coelatus the type locality is restricted to “ 10 milles au nord des îles Idolos ” (cf. ICNZ, Art. 76.2), actually 16 miles north of Holbox Island. Rathbun (1925) considered Idolos Island a mistake for Jolbos Island. The specimen MCZ 2848 is labeled 16 miles north of Joblos Island, however we could not find neither of these localities. Calder (2013) faced a similar problem with the type locality of Obelia hyalina Clarke, 1879 , a hydroid collected during the Blake Expedition whose type locality is "Zoblos Island”. In the narrative of the Blake Expedition there is indeed a reference to Joblos Islands: "… the north side of the Yucatan Bank to Alacran Reef, and from there in a south-east direction into 20 fathoms off the Joblos Islands …" ( Agassiz 1888: ix). It may well be that Idolos, Joblos and Zoblos are probably errors for the Holbox Island, which is located at the northeastern tip of the Yucatan Peninsula, Mexico. The differences in the spelling of the island's name might have been introduced as a result of the variation in the way the name is pronounced (Calder 2013). There are also discrepancies about the distance between the Holbox island and the location from where the material was collected. A. Milne-Edwards (1879: 201) mentioned “... à 10 milles au nord des îles ...”, whereas the type material was labeled “16 mis. North of Joblos Island”. Here we prefer to use the information on the label to determine the type locality of S. coelatus .

Figures

FIGURE 1. A, C, E, Stenocionops coelatus (A. Milne-Edwards, 1878), male, cl 134.10 mm, cw 106.96 mm (USNM 93678). B, D, F, Stenocionops furcatus (Olivier, 1791), male, cl 121.35 mm, cw 78.91 mm (USNM 1191786). A – B, Habitus, dorsal view cephalothorax; C – D, lateral view of cephalothorax and abdomen; E – F, ventral view of thoracic sternum. Scale bars: A – D, 50 mm and E – F, 25 mm.