Pohleus septemspinosus (Stimpson, 1871) gen. nov. et, 2020

Colavite, Jessica, Windsor, Amanda M. & Santana, William, 2020, A new genus for Pericera septemspinosa Stimpson, 1871 and Pericera heptacantha Bell, 1836 (Crustacea, Brachyura, Majoidea), based on morphology and molecular data, Zoosystematics and Evolution 96 (1), pp. 205-216 : 205

publication ID	https://dx.doi.org/10.3897/zse.96.50360
publication LSID	lsid:zoobank.org:pub:3195954C-4A45-4EC4-AE40-20B158D75C5E
persistent identifier	https://treatment.plazi.org/id/6B6ECCD6-3C28-54DF-9965-5917370B4966
treatment provided by	Zoosystematics and Evolution by Pensoft
scientific name	Pohleus septemspinosus (Stimpson, 1871) gen. nov. et
status	comb. nov.

Treatment

Pohleus septemspinosus (Stimpson, 1871) gen. nov. et comb. nov. Figs 2A-D View Figure 2 , 3 View Figure 3 , 5A, B View Figure 5

Pericera septemspinosa Stimpson, 1870 (1871): 113 [type locality: West of Tortugas; 65 m depth, type material: non-extant]. - A. Milne-Edwards 1873: 59, 200, pl. 15A, fig. 2; Gundlach and Torralbas 1900: 365, fig. 366G.

Macrocoeloma septemspinosa - Miers, 1886: 80; Rathbun, 1892: 250; 1898b: 257; 1899: 576.

Macrocoeloma septemspinosum - Moreira 1901: 64, 136; Rathbun 1925: 477, pl. 173, figs 2, 3; Coelho 1971:142; Coelho and Ramos 1972: 218; Soto 1980 (digital document); Powers 1977: 52; Takeda and Okutani 1983: 141; Abele and Kim 1986: 45, fig. 521A; Melo 1996: 219, fig. 1; 1998: 464; Coelho-Filho 2006: 19; Almeida et al. 2007: 15; Alves et al. 2008: 58; Ng et al. 2008: 119; Alves et al. 2012: 54.

Neotype

(Here designated).

USA • male neotype, cl 31 mm, cw 35 mm; Florida, West of Sarasota, R/V Oregon, stn 4088, 27°44'N, 83°45'W; 04 Dec 1962, National Marine Fisheries Service exped.; 27 Oct 2014, W Santana det. ( USNM 1256361) (Fig. 2A, B, D View Figure 2 ).

Material examined.

USA • 1 male; North Carolina, 33°48'06"N, 76°34'42"W, 77 m depth; 03 Apr 1981, Duke Univ. for MMS leg.; 1981, P Krikorian det. ( USNM 220811). • 1 male, 1 juv. female; South Carolina, East of Cape Romain, R/V Albatross, stn 2311, 32°55'00"N, 77°54'00"W, 59.1°F, 114.4 m depth; 05 Jan 1885, U.S. fish commission leg. ( USNM 15127). • 1 juv.; Florida, between Cedar Keys and Delta of Mississippi, R/ V Albatross, stn 2369-2374, 46-48 m depth; Feb 1885 ( USNM 46957). • 1 juv. female; Gulf of Mexico, Southwest of Cape San Blas, R/V Albatross, stn 2373, 29°14'00"N, 85°29'15"W, 45.7 m depth; 07 Feb 1886 ( USNM 15132). • 1 juv. female, 1 male; same collection data as preceding ( USNM 15130). • 2 females; same collection data as preceding ( USNM 15131). • 1 male; Suez of Mexico, R/V Oregon, stn 892, 28°55'N, 85°07'W, 53 m depth; 07 Mar 1954, Fish and Wildlife leg.; 21 Apr 1954, F A Chace Jr det. ( USNM 96389). • 1 male; off Apalachicola Bay, R/V Indian Seal, 28°49'59"N, 85°37'02"W, 177 m depth; 31 Jan 1978; R Lemaitre det. ( USNM 1085620). • 1 male; South of Dog Island, R/V Albatross, stn 2407, 28°47'30"N, 84°37'00"W, 43.8 m depth; 07 Feb 1886, U.S. fish commission exped.; M J Rathbun det. ( USNM 15135). • 3 juv. females; South of stn George Island, R/V Albatross, stn 2406, 28°46'00"N, 84°49'00"W, 47.5 m depth; 15 Mar 1885 ( USNM 15134). • 1 female; 26°45'52"N, 83°21'26"W, 50.2 m depth; 18 Jul 1981, Continental Shelf Associates exped.; R Lemaitre det. ( USNM 273379). • 1 male; same collection data as preceding ( USNM 241027). •1 juv. female; same collection data as preceding ( USNM 236995). • 1 male; 26°16'50"N, 83°23'49"W, 55.5 m depth; 05 Feb 1982, Continental Shelf Associates exped.; R Lemaitre det., ( USNM 241026). • 1 male, 2 females; same collection data as preceding ( USNM 273381). • 1 female, 1 male; same collection data as preceding ( USNM 241024). • 1 male, 1 ovig. female; same collection data as preceding ( USNM 229838). • 1 male; 26°16'44"N, 83°42'49"W, 71.3 m depth; 03 Nov 1980, Continental Shelf Associates exped.; R Lemaitre det. ( USNM 236994). • 1 juv. female; same collection data as preceding ( USNM 241007). • 1 male; same collection data as preceding ( USNM 236987). • 2 males; same collection data as preceding ( USNM 236986). • 1 male; 26°16'43"N, 83°46'49"W, 77 m depth; 24 Jun 1981, Continental Shelf Associates exped.; R Lemaitre det. ( USNM 241029). • 1 female; same collection data as preceding ( USNM 273382). • 1 male; 25°45'35"N, 83°20'14"W, 58.5 m depth; 24 Apr 1981, Continental Shelf Associates exped.; R Lemaitre det. ( USNM 242947). • 1 male; R/V Silver Bay, 25°32'N, 80°04'W, 65.8 m depth; 24 Oct 1960; Oct.1970, D J G Griffin det. ( USNM 1278767). • 1 female; off Dry Tortugas, 24°34'N, 83°16'W, 65.8 m depth; Dec 1877- Jan 1878, USCSS Blake exped.; A. Milne-Edwards det. ( MCZ 8206). • 1 male, 1 female; off Key West, R/V Albatross, 24°25'45"N, 81°46'45"W, stn 2317, 75 °F, 82.3 m depth; 15 Jan 1885, U.S. fish commission exped. ( USNM 15128). • 1 male, 1 female; same collection data as preceding ( USNM 15129). • 1 male; Off Key West, Sand key Light bearing West Northwest, Key West Light bearing North, State Univ. Iowa exped., stn 24, 109.7 m depth; 19 Jun 1893, M J Rathbun det. ( USNM 75724). • 1 male; same collection data as preceding ( USNM 72863). • 1 male, 1 juv. female; Sand Key Light bearing Northwest by North, Key West Light North 0.5mile East, 91.4-109.7 m depth ( USNM 68913). • 1 male; Florida, Pompano; 23 May 1949 (AMNH 10961). Bahamas • 1 juv. female; Bahamas Bank; 18 May 1893, State Univ. Iowa Bahamas exped. ( USNM 72862). Colombia, • 1 male; 2 miles Southwest of Cape La Vela; 8 Apr 1939, J Garth leg.; 17 Jan 2018, J Colavite det. (AHF 39295). • 1 juv. female; 2 miles off Bahia Honda, R/V Velero III, stn A15-39, 9-18.28 m depth; 08 Apr 1939, J Garth det. (AHF 39292). Venezuela • 1 juv. male; 7 miles of Tortugas Island, R/V Velero III, stn A43-39, 73-75 m depth; 21 Apr 1939, J Garth det. (AHF 39293). • 1 male; 125 miles northeast of Macaibo, 12°37'N, 70°45'W, R/V Oregon, stn 4400, 97 m depth; 26 Sep 1963; 27 Oct 2014, W Santana det. ( USNM 1256370). • 1 male; 50 miles northeast of Caracas, 10°44'N, 66°09'W, R/V Oregon, stn 4466, 73 m depth; 17 Oct 1963; 23 Oct 2014, W Santana det. ( USNM 1256347). French Guiana • 1 ovig. female; Guiana 2014 exped., R/V Hermano Gines, 6°17'58.2"N, 52°13'18.5952"W, 95-97 m depth; 08 Aug 2014 ( MNHN IU 2013-2682). Brazil • 1 ovig. female; Recife, dredge 2; J Colavite det. (R2 unnumbered). • 1 ovig. female; Bahia, Ilhéus, Costa de Ilhéus, 14°43'33"S, 38°57'20"W, 41-42 m depth; 28 Nov 2004, A O Almeida det.; old number MZUESC 406 (CIASB M. 2017.0084. UESC).

Diagnosis.

Rostrum width half of interorbital length bifurcated, base elongated, fused, diverging abruptly forming a Y-shape. Pleonal somite II smooth; merus of second pereopod armed with a spine.

Description.

Cephalothorax and appendages sparsely covered with short, velvet-like pubescence. Carapace subglobose wider than long, convex, with long lines of hooked and simple setae in all carapace regions, denser in rostral and lateral spines. Rostrum width half of interorbital length bifurcated, base elongated and fused, abruptly diverging forming a Y-shape, ending in acute tips. Interorbital region slightly depressed medially. Hepatic region broad. One metagastric spine. Four long, strong, conical lateral spines (two in each branchial region), in line with the cardiac spine. One short intestinal spine. Orbital region very prominent, eyes completely protected in orbit when retracted, ocular peduncle visible when not retracted. Pre-orbital spine acute, directed upwards, tip curved, longer than post-orbital spine, ventral margin of pre-orbital spine with a small crenulation; post-orbital spine curved upwards.

Antennular fossae wider than long, margins smooth. Interantennular septum elongated, compressed laterally, forming distinct, ventrally-directed lobe. First and second antennal articles fused to epistome, suture between antenna and epistome visible, antennal gland opening near suture line. Basal article of antenna with three spines, one tubercle, not visible in dorsal view. Antennal flagella longer than rostral spines, behind rostrum in dorsal view.

Epistome anterior margin narrower than antennular fossae, smooth. Buccal field sub-quadrate, narrower at posterior edge with acute spine at anterolateral angle in line with antennal spines. Third maxillipeds completely covering buccal field. Exopod long, nearly reaching distal margin of merus. Pterygostomial region subtriangular, slightly inflated, separated from subhepatic region by marked groove, one long, strong spine slightly curved upwards on medial margin, visible in dorsal view.

Chelipeds equal, longer than pereopods in adults, more robust in adult males; females chelipeds shorter than males, slender. In males, ischium, merus, carpus and propodus segments granulate. Ischium with one prominent tubercle laterodistally. Merus with one spine on proximal half, one on distal margin. Carpus with four tubercles sparsely distributed. Dactylus arched in adult males, a small gap between fingers, distinctly shorter than palm. Cutting edges with sub-equal teeth in distal half, one distinct proximal tooth in larger males; distal half with dark brown colour in fixed specimens. Female ischium, merus, carpus and propodus with smaller tubercles than males, dactylus slightly arched, without gap between fingers.

Pereopods short, slender, cylindrical. P2 longest, P3-P5 progressively decreasing in length. P2 merus with distinct spine in distolateral margin. Dactylus slightly curved, shorter than propodus, smooth ventrally, with corneous tip.

Male thoracic sternites I-IV fused, broadly triangular, smooth, anterior half declivous in ventral view, forming a carina along the sterno-pleonal cavity margin. Thoracic sternal somite IV with lateral margins straight. Telson fully fitted to cavity, anterior margin smooth. Sternite VIII concealed by pleon. Episternites IV and V forming a continuous line with the sternite, slightly downward directed.

Pleonal somites I-VI, telson free in males and females, slightly raised medially forming low longitudinal ridge. Male telson sub-triangular, apex rounded. Female pleon markedly arched, with row of setae marginally. Female telson transversally ovate.

G1 longer than thoracic sternal suture IV-V, stout, straight, parallel, with torsion in distal half, apex bilobed; mesial lobe short, with tip curved upwards; lateral lobe long, slightly arched, ending in an acute tip; lateral margin smooth. G2 slender, straight, very short (one fifth of G1 length), with disto-medial process.

Colour in life.

Carapace light brown; cephalothorax ventral, pleon and pereopods pinkish to purple (Fig. 3 View Figure 3 ).

Neotype locality.

USA, Florida, west of Sarasota, 27°44'N, 83°45'W.

Geographic distribution. Western Atlantic: USA (from North Carolina); Gulf of Mexico; Bahamas; Venezuela and Brazil (from Ceará to Bahia) (Fig. 4 View Figure 4 ).

Remarks.

The type material of Pericera septemspinosa was probably lost in the Great Chicago Fire in 1871 (see Evans 1967; Deiss and Manning 1981; Manning 1993; Vasile et al. 2005; Manning and Reed 2006). The male ( USNM 1256361) is here designated as neotype of Pericera septemspinosa Stimpson, 1871 due to the close morphological similarity to the original description. The neotype is from a region close to the type locality. The specimen chosen here is from west of Sarasota, 27°44'N, 83°45'W (cf. ICZN art.75 and 76).

Pohleus septemspinosus gen. nov. et comb. nov. can be distinguished from its Pacific congener, Pohleus heptacanthus gen. nov. et comb. nov., by the following characters: (i) rostrum width half of the interorbital length in P. septemspinosus gen. nov. et comb. nov. (vs. rostrum with one-third or less of the interorbital length in P. heptacanthus gen. nov. et comb. nov.; Fig. 5C, D View Figure 5 ); (ii) pleonal somite II smooth in P. septemspinosus gen. nov. et comb. nov. (vs. pleonal somite II with one spine or tubercle in P. heptacanthus gen. nov. et comb. nov.; Fig. 5C, D View Figure 5 ); (iii) merus of the second pereopod armed with a spine in P. septemspinosus gen. nov. et comb. nov. (vs. merus of second pereopod unarmed in P. heptacanthus gen. nov. et comb. nov.; Fig. 5C, D View Figure 5 ). Unfortunately, no male specimens of Pohleus heptacanthus gen. nov. et comb. nov. were available for study, thus, the gonopodal differences cannot be ascertained.

The southeast record of this species as Espírito Santo State, in Brazil (Serejo et al. 2006: fig. 8C) is not valid, since the specimen (MNRJ 17062) was re-identified as Macrocoeloma concavum . Therefore, the distribution of to Pohleus septemspinosus gen. nov. et comb. nov. is corrected to the Brazilian coast, from Ceará to Bahia.