Phimochirus leurocarpus McLaughlin, 1981

Lima, Daniel, Tavares, Marcos & Jr, Joel Braga De Mendonça, 2019, Paguroids (Decapoda: Anomura: Diogenidae and Paguridae) of the remote oceanic Archipelago Trindade and Martin Vaz, off southeast Brazil, with new records, description of three new species and zoogeographical notes, Zootaxa 4694 (1), pp. 1-63 : 52

Phimochirus leurocarpus McLaughlin, 1981

( Figs. 26 , 27 )

Phimochirus leurocarpus McLaughlin, 1981b: 356 , figs. 4f, 9b, 10b, 11a–f, 12a–e; Abele & Kim 1986: 34, 382, fig. e, f; McLaughlin et al. 2010: 34.

Trindade specimens. 1 ovigerous female sl 2.3 mm ( MZUSP 36196), Brazil, off Espírito Santo, Trindade Island, 20°29’2”S, 29°18’2”W, R/V “Marion Dufresne”, cruise TAFF MD 55/ Brésil 1987, stn 36/ DC 61, 22.v.1987, Halimeda rich sand, 63 m.

Comparative material examined. Phimochirus leurocarpus : 1 male, sl 3.4 mm ( USNM 1267511 ), Curaçao, 12º04’59”N, 68º53’57”W, “CURASUB” DSR/V, Baldwin, C., Castilho, C. & Bebber, B. coll., 9.xii.2014, submersible, 168–268 m; holotype female, sl 2.1 mm ( USNM 180382), Caribbean Sea, Venezuela, west of Tortuga Island, 10°57’N, 65°52’W, R/V “ Pillsbury ” coll., cruise 6806, stn 736, 22.vii.1968, 69– 155 m.

Phimochirus occlusus ( Henderson, 1888) : 1 female, sl 3.6 mm ( USNM 265211 ), Caribbean Sea, British Virgin Islands, 18°40’N, 64°51’W, R/V “ Caroline ”, Johnson-Smithsonian Deep-Sea Expedition, P. Bartsch coll., 3.iii. 1933, 402 m. 1 male ( USNM 184302 ), idem, west of Anegada Island, 18°47’00”N, 64°46’42W, R/V “Pillsbury”, cruise 6907, stn 991, 23.vii.1969, 187– 622 m. 5 specimens ( MZUSP 13859 ), São Paulo, Projeto REVIZEE, stn 6661, 147 m; 21 specimens ( MZUSP 13881 ), Brazil, Rio de Janeiro, Cabo Frio, 350–400 m.

Type locality. West of Tortuga Island, 10°57’N, 65°52’W, Venezuela, between 69 and 155 m.

Distribution. Bermuda, Strait of Florida, Caribbean Sea of Puerto Rico, north coast of Venezuela ( McLaughlin, 1981b), Curaçao and Brazil (off Espírito Santo, Trindade Island, this study), between 38 and 268 m.

Remarks. The specimen here reported from Trindade Island is assigned to Phimochirus , whose diagnostic characters ( McLaughlin 1981b) are readilly reconized in the Brazilian material, namely, 11 pairs of biserial gills, crista dentata of the third maxilliped with one accessory tooth, propodal rasp with one row of corneous scales ( Fig. 26F ), presence of a well-developed preungual process ( Fig. 26F ), and females with first pleopod paired and modified as gonopods.

Phimochirus leurocarpus superficially resembles P. occlusus ( Henderson, 1888) , from which it can be readly distinguished by the presence of a row of spines on the ventral margins of dactyls of the ambulatory legs ( Fig. 26 B– D), such spines are absent in P. occlusus . This is the first record of P. leurocarpus from the southwestern Atlantic ( Brazil), hence extending its distribution southward to around 20°S. The species was previously known only from the type material from Straits of Florida and Venezuela, and a few additional specimens from Bermuda and Puerto Rico. Here, we also recorded a specimen from Curaçao.

Figures

FIGURE 26. (A–F) Phimochirus leurocarpus McLaughlin, 1981, ovigerous female, sl 2.3 mm (MZUSP 36196). (A) shield and cephalic appendages, dorsal view. (B–D) P3: (B, D) left, lateral and mesial views, respectively; (C) right, lateral view. (E) telson, dorsal view. (F) dactylus, propodus and carpus of right P4, lateral view. Scale bars: A–D, 1.0 mm; E, F, 0.25 mm.

FIGURE 27. (A–G) Phimochirus leurocarpus McLaughlin, 1981, ovigerous female, sl 2.3 mm (setae partially omitted) (MZUSP 36196). (A, G) left cheliped, dorsal and mesial views, respectively. (B, F) right cheliped, dorsal and mesial views, respectively. (C, D) right cheliped carpus and propodus, lateral view. (E, F) right cheliped, lateral and mesial views, respectively. Scale bars: 1.0 mm.