Campylaspis alisae, Corbera, Jordi, 2008

Corbera, Jordi, 2008, New cumacean species (Crustacea: Peracarida) from Salomon Islands, Zootaxa 1743, pp. 17-33 : 24-28

Campylaspis alisae sp. nov.

( Figs. 7–9 )

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 adult female partially dissected in one slide, holotype (MNHN-Cu1134).

Description. Adult female 8.2 mm total length. Carapace ( Fig. 7 A, B) half length of total length, with two sharp oblique carinae on each side running from the anterolateral angle to the dorsal posterior third of carapace where they connect with their symmetrical and between them by a pair of transverse carinae, an additional transverse carina connecting both oblique carinae near the frontal lobe. Eyelobe small and without lenses.

Antennule ( Fig. 7 C), peduncle article 1 as long as articles 2 and 3 combined length; article 3 shorter than article 2; main flagellum 2-articulate, with two aesthetascs and a long simple seta, accessory flagellum rudimentary. Mouth appendages not dissected in order to preserve the holotype.

Maxilliped 2 ( Fig. 7 D) basis longer than rest of appendage, with a club-shaped seta on inner distal corner that not reaches the end of carpus; merus with a long pappose seta; carpus longer than merus, with five pappose setae on inner margin and a pappose seta on distal outer corner; propodus with a spine; dactylus with three teeth. Maxilliped 3 ( Fig. 8 A), basis longer than rest of appendage, with two small pappose setae on inner margin and two long pappose setae on distal outer corner; merus with a pappose setae on distal outer corner, inner margin finely serrate with simple setae; carpus half length of merus, with a long pappose seta on distal outer corner; propodus more than two times as long as dactylus, with two pappose and a simple setae on inner margin; dactylus with three simple setae terminally and some on the margins, the longest three times as long as the article.

Pereopod 1 ( Fig. 8 B) with a well developed exopod, basis shorter than rest of appendage with two pappose setae on the inner margin and one on the outer; ischium with a long pappose seta on distal corner; merus the longest article after the basis with simple and pappose setae on inner margin and three pappose setae on outer margin, distal outer corner with a tooth; carpus shorter than propodus with five pappose setae on inner margin and two on the outer; propodus more than twice as long as dactylus with simple setae on both margins. Pereopod 2 ( Fig. 8 C) with a well developed exopod, basis shorter than the rest of appendage, with a long pappose seta on distal ventral corner and a pappose seta on dorsal margin; ischium short; merus shorter than carpus, with a pappose and a simple setae on ventral margin and a pappose seta on dorsal margin; carpus more than twice as long as propodus, with two pappose setae on dorsal margin and a simple and a pappose setae on distal ventral corner; propodus unarmed; dactylus slightly longer than the four preceding articles together with four simple setae on ventral margin, one on dorsal margin and two subterminally. Pereopod 3 ( Fig. 9 A) much basis longer than the rest of appendage, with four pappose setae on anterior margin, two simple small setae on the posterior margin and a pappose seta distally; ischium half length of merus with a long simple seta distally; merus shorter than carpus, with a pappose seta; carpus with two pappose setae on the margin and a long simple seta distally; propodus with a long simple seta on distal corner. Pereopod 4 ( Fig. 9 B) basis longer than rest of appendage with three pappose setae on the margin and a other on distal corner; merus shorter than carpus; carpus with two pappose setae on the margin and a long simple seta on distal corner; propodus with a long simple seta on distal corner. Pereopod 5 ( Fig. 9 C) basis shorter than rest of appendage with a pappose seta on the margin and other on the distal corner; merus shorter than carpus with a distal simple seta; carpus with two pappose setae on the margin and a simple seta distally; propodus half length of carpus with a simple seta distally.

Uropod peduncle ( Fig. 9 D) almost three times as long as endopod with serrate inner margin. Rami subequal; endopod 1-articulate with five serrulate setae on inner margin and a simple and a long serrulate setae terminally. Exopod with two terminal setae.

Etymology. The new species is named after the research vessel “Alis” which the cruise SALOMON-I was carried out with.

Remarks. The new species is closely related to Campylaspis johnstoni form B described by Ledoyer (1993) from the Weddell Sea and C. bulbosa Jones, 1974 from the deep Atlantic, but it differs from them by the transverse carina connecting oblique carinae near the frontal lobe. Moreover, C. alisae sp. nov. has an uropod peduncle longer than C. bulbosa (peduncle 3 times as long as endopod vs. 1.5 times) and the seta of the distal inner corner of the maxilliped 2 is short but not club-shaped as in C. alisae (this character is unknown for C. johnstoni form B).

Campylaspis johnstoni form B seems clearly to be a different species from C. johnstoni Hale, 1937 as already noted Ledoyer (1993). Later Petrescu and Wittmann (2003) described Campylaspis ledoyeri , also from the Weddell Sea, suggesting to assign the Ledoyer’s material to the new species described by them. However, C. ledoyeri differs from all other species mentioned above by having three oblique carinae instead of two. Thus, C. johnstoni form B could be an undescribed species that only further studies of the material described by Ledoyer will be able to elucidate.

Figures

FIGURE 7. Campylaspis alisae sp. nov. adult female holotype (MNHN Cu 1134): A, whole animal in dorsal view; B, whole animal in lateral view; C, antennule; D, maxilliped 2.

FIGURE 8. Campylaspis alisae sp. nov. adult female holotype (MNHN Cu 1134): A, maxilliped 3; B, pereopod 1; C, pereopod 2.

FIGURE 9. Campylaspis alisae sp. nov. adult female holotype (MNHN Cu 1134): A, pereopod 3; B, pereopod 4; C, pereopod 5; D, last pleonite and uropod.