Bathylamprops pagesi, Corbera, Jordi, 2008

Corbera, Jordi, 2008, New cumacean species (Crustacea: Peracarida) from Salomon Islands, Zootaxa 1743, pp. 17-33 : 18-21

Bathylamprops pagesi sp. nov.

( Figs. 1–3 )

Type material. Salomon Islands, cruise SALOMON I, V/ O “Alis” stn CP1833, 10°11.8’S 161°18.7’E, 367– 533 m, 05.10.2001: 1 preparatory female partially dissected in one slide, holotype (MNHN-Cu1132).

Description. Preparatory female 8.75 mm total length. Carapace ( Fig. 1 ) slightly shorter than a third of total length, with a middorsal carina finely serrate on the carapace anterior half and three pairs of oblique carinae laterally; pseudorostral lobes produced but shorter than one fifth of carapace length; eyelobe rounded, eyeless, with a forward curved spine on the tip; antennal notch well market, anterolateral angle with few serrations. All 5 pereon somites visible. Pleon somites without ridges or swellings.

Antennule ( Fig. 2 A), peduncle article 1 longer than articles 2 and 3 combined length; article 3 shorter than article 2; main flagellum 3-articulate, with two aesthetascs and a long simple seta, accessory flagellum shorter than main flagellum article 1. Mouth appendages not dissected in order to preserve the holotype.

Maxilliped 2 ( Fig. 2 B) basis almost as long as rest of appendage, with a plumose seta on inner distal corner and two pappose setae on distal outer corner; merus with three pappose setae, one on the distal outer corner, one on the inner margin and the longest medially; carpus longer than merus, with five pappose setae on inner margin and a pappose seta on distal outer corner; propodus with a long pappose seta on outer margin and three simple setae on the inner. Maxilliped 3 ( Fig. 2 C) basis with a well developed exopod, slightly longer than rest of appendage, with six pappose setae on inner margin and three on distal outer corner; merus with two pappose setae on distal outer corner; carpus being the longest article after the basis, widely expanded laterally with a row of pappose setae on inner margin increasing their length from the proximal to the distal; propodus longer than dactylus, with three pappose setae on outer margin and two simple setae on distal inner corner.

Pereopod 1 basis with a well developed exopod, rest of appendage lost. Pereopod 2 ( Fig. 2 D) with a well developed exopod, basis shorter than the rest of appendage, with four small pappose setae on dorsal margin; ischium short, with a simple seta; merus three times as long as ischium, with a small pappose seta and a long cuspidate seta on distal ventral corner and one small simple seta on dorsal distal corner; carpus more than twice as long as merus, with five cuspidate setae on ventral margin and a simple and a cuspidate setae on dorsal margin; propodus less than half length of dactylus; dactylus with two simple setae terminally, being the longest as long as the article, and two small simple setae on the margin. Pereopod 3 ( Fig. 3 A) with rudimentary 2-articulate exopod, basis longer than the rest of appendage, with two pappose setae on the margin and two simple and a long pappose setae distally; ischium half length of merus with two simple setae distally; merus slightly longer than carpus; carpus with a simple seta on the margin and two long setae on distal corner; propodus with one long seta on distal corner. Pereopod 4 ( Fig. 3 B) with rudimentary 2-articulate exopod, basis shorter than rest of appendage with a pappose seta on the margin and a simple one on distal corner; merus and carpus of similar length; carpus and propodus with two and one long simple setae on distal corner respectively. Pereopod 5 ( Fig. 3 C) basis shorter than rest of appendage; merus and carpus of same length with a long simple seta on distal corner each.

Telson ( Fig. 3 D) two times as long as last pleonite, with four pairs of cuspidate setae on distal half of lateral margins and three cuspidate equal terminal setae, twice longer than lateral ones. Uropod peduncle ( Fig. 3 D) slightly longer than telson with seven small cuspidate setae on inner margin. Rami subequal; endopod 3- articulate, shorter than peduncle; article 1 with five cuspidate setae on inner margin, article 2 with a cuspidate seta on distal inner corner and article 3 with two setae terminally. Exopod article 2 more than twice as long as article 1, with two terminal setae.

Etymology. The new species is named after Francesc Pagès a great expertise on taxonomy and ecology of gelatinous zooplankton but above all a very good friend, who passed away suddenly at the best of his life.

Remarks. Bathylamprops pagesi sp. nov. differs from all five currently known species in the genus by the three oblique lateral carinae and the rounded eyelobe absent in the other species.

Figures

FIGURE 1. Bathylamprops pagesi sp. nov. preparatory female holotype (MNHN Cu 1132) whole animal in lateral view.

FIGURE 2. Bathylamprops pagesi sp. nov. preparatory female holotype (MNHN Cu 1132): A, antennule; B, maxilliped 2; C, maxilliped 3; D, pereopod 2.

FIGURE 3. Bathylamprops pagesi sp. nov. preparatory female holotype (MNHN Cu 1132): A, pereopod 3; B, pereopod 4; C, pereopod 5; D, last pleonite, uropod and telson.