Bathylamprops caperatus, Corbera, Jordi, 2008

Corbera, Jordi, 2008, New cumacean species (Crustacea: Peracarida) from Salomon Islands, Zootaxa 1743, pp. 17-33 : 21-22

Bathylamprops caperatus sp. nov.

( Figs. 4–6 )

Type material. Salomon Islands, cruise SALOMON I, V/ O “Alis” stn CP1781, 8°31.2’S 160°37.7’E, 1036– 1138 m, 29.09.2001: 1 preparatory female partially dissected in one slide, holotype (MNHN-Cu1133).

Description. Preparatory female 12.45 mm total length. Carapace ( Fig. 4 A, B) about a third of total length, with two pairs of oblique carinae laterally, surface of anterior half wrinkled; pseudorostral lobes produced but shorter than one fifth of carapace length; eyelobe narrow and elongate, eyeless; antennal notch well market, anterolateral angle with few serrations. All 5 pereon somites visible. Pleon somites without ridges or swellings.

Antennule ( Fig. 4 C), peduncle article 1 longer than articles 2 and 3 combined length; article 3 longer than article 2; main flagellum 3-articulate, with a aesthetasc and a long simple seta, accessory flagellum 2-articulate, shorter than article 1 of the main flagellum. Mouth appendages not dissected in order to preserve the holotype.

Maxilliped 1 ( Fig. 5 A) carpus with 6 comb-like setae; propodus as wide as long with pappose setae on distal margin; dactylus longer than propodus. Maxilliped 2 ( Fig. 5 B) basis shorter than rest of appendage, with a plumose seta on inner distal corner and a pappose seta and two teeth 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 seven pappose setae on inner margin and a pappose seta on distal outer corner; propodus with a pappose seta on outer margin, four simple setae on the inner and a pappose seta on distal outer corner. Maxilliped 3 with a well developed exopod, basis with six pappose setae on inner margin and three on distal outer corner, rest of appendage lost.

Pereopod 1 ( Fig. 5 C) with a well developed exopod, basis shorter than rest of appendage, lower margin slightly serrate and with three teeth and seven small pappose setae, three pappose setae on the upper margin; ischium shorter than merus, which has three pappose setae; carpus 1.6 times as long as propodus; dactylus longer than propodus and shorter than carpus, with two long simple setae terminally. Pereopod 2 ( Fig. 5 D) with a well developed exopod, basis shorter than the rest of appendage, with four small pappose setae on ventral margin and two on dorsal margin; ischium very short; merus four times as long as ischium, with a small pappose seta on distal dorsal corner and a long cuspidate seta on distal ventral corner; carpus three times as long as merus, with six cuspidate setae on ventral margin and short pappose setae on dorsal margin; dactylus 2.5 times as long as propodus, with two simple setae terminally, being the longest as long as the article, and a small simple seta on the margin. Pereopod 3 ( Fig. 6 A) with rudimentary 2-articulate exopod, basis longer than the rest of appendage, with three pappose setae; ischium half length of merus; merus shorter than carpus; carpus with three pappose and two long simple setae; propodus shorter than carpus, with a long simple seta on distal corner. Pereopod 4 ( Fig. 6 B) with rudimentary 2-articulate exopod, basis shorter than rest of appendage, with four pappose setae on the margin and one on distal corner; merus shorter than carpus with two long simple setae; carpus with a pappose and two long simple setae on distal corner; propodus with a long simple seta on distal corner. Pereopod 5 ( Fig. 6 C) basis shorter than rest of appendage; merus shorter than carpus with two long simple setae; carpus with a pappose and two long simple setae on distal corner; propodus with a long simple seta on distal corner.

Telson ( Fig. 6 D) nearly three times as long as last pleonite, with seven pairs of cuspidate setae on lateral margins and three cuspidate setae terminally, which are shorter than the lateral ones. Uropod peduncle ( Fig. 6 D) noticeably longer than telson with ten small cuspidate setae on inner margin. Rami equal in length; 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 three setae terminally. Exopod article 2 1.8 times as long as article 1, with three small cuspidate setae on outer margin and three terminally.

Etymology. From the Latin capera meaning wrinkle, referring to the wrinkled surface of the carapace. Remarks. Bathylamprops calmani Zimmer, 1908 has as B. caperatus sp. nov. a short oblique carina running from the anterolateral corner backwards and a rudimentary eyelobe. However, the carapace of B. calmani is minutely denticulate forming transverse ridges (see Day 1978) that are absent in B. caperatus . The latter differs from B. pagesi by shape of the eyelobe, the wrinkled surface of the carapace and the proportions and setation of the telson being longer and with a higher number of lateral setae.

Figures

FIGURE 4. Bathylamprops caperatus sp. nov. preparatory female holotype (MNHN Cu 1133): A, whole animal in lateral view; B, carapace in dorsal view; C, antennule.

FIGURE 5. Bathylamprops caperatus sp. nov. preparatory female holotype (MNHN Cu 1133): A, maxilliped 1; B, maxilliped 2; C, pereopod 1; D, pereopod 2.

FIGURE 6. Bathylamprops caperatus sp. nov. preparatory female holotype (MNHN Cu 1133): A, pereopod 3; B, pereopod 4; C, pereopod 5; D, last pleonite, uropod and telson.