Scyllarocuma mclaughlinae, Corbera, 2006

Corbera, Jordi, 2006, A new operculate cumacean genus (Bodotriidae, Vaunthompsoniinae) from deep waters of New Caledonia, Zoosystema 28 (2), pp. 325-330 : 327

Scyllarocuma mclaughlinae n. sp. ( Figs 1 ; 2 )

HOLOTYPE. — New Caledonia. BIOCAL, stn DW 36, 23°08.64’S, 167°10.99’E, 650 m, 29.VIII.1985, 1 immature ♀ 8.5 mm total length, partially dissected in one slide (MNHN-Cu 1057).

ETYMOLOGY. — This species is named after Patsy A. McLaughlin, in recognition of her valuable contribution to the knowledge of cirripeds and anomurans.

DESCRIPTION OF IMMATURE FEMALE

Carapace 0.4times total length, smooth; pseudorostral lobes meeting in front of frontal lobe, flattened and expanded laterally, and reaching anterolateral angles; antennal notch absent; frontal lobe without eye.First pedigerous somite not visible externally; second to fourth pedigerous somites almost fused dorsally, with well developed pleural plates.Pleon reduced, shorter than carapace length. Well developed exopods on third maxilliped and first pereopod, rudimentary exopods on second to fourth pereopods.

First antenna geniculate, second article of peduncle longer than first and three times as long as third; main flagellum two-articulated. Basis of third maxilliped shorter than rest of limb, with small simple setae on inner and outer margins as well as distal ventral face; ischium fused with basis; merus very short; carpus longer than propodus with five pappose setae on inner margin and several small simple setae on the outer; propodus with six long setae on inner margin, and several long simple setae and one pappose seta on outer margin;dactylus shorter than half length of propodus, with six acuminate setae of different length on tip. First pair of pereopods strongly modified forming operculum fully closing cavity between lateral folds of carapace;basis progressively expanded from proximal to terminal part, first article of exopod also slightly expanded; ischium very short between articulations, with basis and merus but greatly expanded laterally and distally forming a square plate that covers rest of appendage; merus short; carpus robust with some serrations on proximal inner margin; propodus also robust, as long as carpus, with brush of long micropectinated setae; dactylus rudimentary. Second pereopod with two-articulated exopod, basis shorter than length of two following segments combined;ischium fused with basis; merus and carpus of similar length, with acuminate setae on distal corners; propodus short; dactylus twice length of propodus, with three acuminate setae on tip. Third pereopod with twoarticulated exopod; basis of similar length to merus, with few pappose setae; ischium very short, with two long simple setae; merus with three long simple setae on distal third; carpus shorter than merus, slightly produced distally, with five long curved simple setae; propodus small with distal long simple seta.Uropod as long as last two abdominal somites; peduncle as long as wide; endopod one-articulated, twice as long as peduncle, with small simple seta terminally; exopod two-articulated, longer than endopod, with two simple setae terminally.

Figures

FIG. 1. — Scyllarocuma mclaughlinae n. gen., n. sp., holotype immature ♀ (MNHN-Cu 1057): A, whole animal in lateral view, note the position of abdomen in straight angle; B, whole animal in dorsal view. Scale bar: 1 mm.

FIG. 2. — Scyllarocuma mclaughlinae n. gen., n. sp., holotype immature ♀ (MNHN-Cu 1057): A, antenna 1; B, maxilliped 3; C, internal view of pereopod 1; D, external view of pereopod 1; E, second pereopod; F, third pereopod; G, uropod. Abbreviations: bas., basis; car., carpus; isc., ischium; mer., merus; pro., propodus. Scale bars: A, G, 0.2 mm; B-F, 0.5 mm.