Paguruncio, Lemaitre & Felder & Poupin, 2017

Lemaitre, Rafael, Felder, Darryl L. & Poupin, Joseph, 2017, Discovery of a new micro-pagurid fauna (Crustacea: Decapoda: Paguridae) in the Lesser Antilles, Caribbean Sea, Zoosystema 39 (2), pp. 151-195 : 178-179

Genus Paguruncio n. gen.

TYPE SPECIES. — Paguruncio parvulus n. gen., n. sp., by present designation. Gender: masculine.

ETYMOLOGY. — The generic name is derived from the genus name Pagurus , and using the masculine Latin suffix - uncio which denotes something diminutive, in reference to the minute size of specimens in the single species of this new genus.

DIAGNOSIS. — Eight pairs of biserial phyllobranch gills, no gill on third maxilliped and cheliped, no pleurobranchs on somites X, XI (thoracomeres 5, 6, above pereopods 2 and 3). Rostrum broadly triangular. Ocular acicles terminating in simple spine. Ischium with accessory tooth.Chelipeds subequal in length, right not much stronger than left. Sternite of somite XI (thoracomere 6, pereopod 3) with subrectangular anterior lobe. Pereopod 4 with single row of scales on propodal rasp, dactyl lacking preungual process. Pereopod 5 semi-chelate. Male with paired, subequal, slender, membranous sexual tubes directed posteriorly, on coxae of pereopods 5; pleopod condition unknown. Female with paired gonopores; plepood condition incompletely known except for presence of unpaired left pleopod 5. Telson nearly symmetrical, with lateral indentations; terminal margins oblique, armed with spines.

DISTRIBUTION. — Known based on the type species found in Curaçao, at a depth of 224 m

REMARKS

There is no clear morphological relationship or similarity between the single species of Paguruncio n. gen. and the other species described in this report that also have male sexual tubes. Paguruncio , n. gen. and Paguriscus n. gen. both have paired, subequal sexual tubes, although the tubes are morphologically different ( Figs 16G ; 18E ). Both new genera have eight pairs of biserial gills; however, the gill formula is quite different in the two (see respective Diagnoses).

Figures

FIG. 16. — Paguriscus robustus n. gen., n. sp., holotype ♂ 1.3 mm, Guadeloupe, sta GS 20, MNHN-IU-2013-4395: A, shield and cephalic appendages, dorsal view; B, right pereopod 3, lateral view; C, dactyl of same, mesial view; D, sternite XI of third pereopods, ventral view; E, propodus and dactyl of right pereopod 4, lateral view; F, telson, dorsal view; G, coxae of pereopods 5, sternite XIII, and anterior part of pleon, ventral view. Scale bars: 0.5 mm.

FIG. 18. — Paguruncio parvulus n. gen., n. sp.: A-D, holotype ♀ 0.4 mm, Curaçao, ARMS 17, USNM 1297508; E, paratype ♂ 0.6 mm, ARMS 23, USNM 1297613. A, shield and cephalic appendages, dorsal view; B, sternite XI and coxae of third pereopods, ventral view; C, propodus and dactyl of right pereopod 4, lateral view; D, telson, dorsal view. Scale bar: 0.5 mm.