Mantisgebia multispinosa, Liu, Wenliang, Liu, Ruiyu & Liu, J. Y., 2013

Liu, Wenliang, Liu, Ruiyu & Liu, J. Y., 2013, A new species of the genus Mantisgebia Sakai, 2006 (Crustacea, Decapoda, Gebiidea, Upogebiidae) from the South China Sea, Zootaxa 3637 (5), pp. 592-596 : 593-594

Mantisgebia multispinosa sp. nov.

( Figs 1–4 )

Material examined. Holotype: ovig. Ƥ (cl, 3.0 mm), MBM136981/SSIVB-28, Stn. 45, Nansha Islands, 4°30ʹN, 110°00ʹE, depth 107 m, 18 May 1987. Paratype: 1 ovig. Ƥ (cl, 3.0 mm), MBM136980/SSIVB-26, Stn. 45, Nansha Islands, 4°30ʹN, 110°00ʹE, depth 107 m, 15 May 1987.

Description. Rostrum ( Figs 1 , 2 A–B) elongate, about 2.3 times as long as basal width; tip blunt, projecting far beyond eyes, with 6 spines on each lateral margin, without infrarostral spine; dorsal surface with dense setae and 1 row of small spines opposite sides of median longitudinal groove respectively. Lateral ridges divided by weak middorsal notch, unarmed dorsally, and terminating in small spine distally.

Anterolateral border of carapace with 5 spines (3 postocular spines); cervical groove long and deep, with 10 small spines; hepatic region with 6 small spines.

Eyestalks stout ( Fig. 2 A), reaching to 1/3 length of rostrum, unarmed; cornea almost fully pigmented.

Antennular peduncle reaching to penultimate article of antennal peduncle, articles 1–3 with 3, 1 and 2 spines on lower margin, respectively.

Antennal peduncle thick, article 1 with a curled spine on lower margin; article 2 with 3 spines on lower margin, outer surface with a small sub-basal spine near to upper margin; article 3 with ovate scale on upper surface; article 4 with 4 spines on lower margin; article 5 with a spine at midlength of lower margin.

Maxilliped 3 slender; exopod consisting of 4 articles, longer than the upper margin of ischium ( Fig. 2 C).

Female pereopod 1 subchelate, slender ( Fig. 3 A–B). Basis unarmed. Ischium with 1 lower spine. Merus about 5.0 times as long as high, with a row of about 9 lower spines and 2 spines on upper distal quarter. Carpus triangular, elongate, about 0.4 length of merus, with 2 rows of small spines on upper margin and 1 lower subdistal spine, inner face with 3 distal spines. Propodus 3.9 times as long as high, 1.6 length of carpus, with 2 rows of strong spines on upper margin and row of 5 strong lower spines, inner face with row of 12 slender spines near to lower margin; fixed finger triangular, distally sharp, cutting edge curved, with 2 sharp teeth. Dactylus slender with corneous tip, about 0.7 length of palm, lower margin arched, with 5 inconspicuous teeth at midlength, lateral surface carinate medially. Pereopod 2 missing.

Pereopod 3 ( Fig. 4 A) ischium unarmed. Merus with 4 lower spines, upper margin unarmed. Carpus with a small upper spines. Propodus about 0.8 length of carpus, unarmed, widening in middle. Dactylus slender and elongate, slightly longer than propodus, lower margin with 4 small corneous spines.

Pereopod 4 ( Fig. 4 B) unarmed. Dactylus slender, slightly longer than propodus.

Pereopod 5 ( Fig. 4 C) subchelate, unarmed. Dactylus elongate, slightly curved; fixed finger with several small corneous spines.

Abdominal sternites smooth. Telson almost as long as wide ( Fig. 2 D), slightly shorter than abdominal somite 6; distal margin deeply concave in broad V-shape.

Female pleopod 1 uniramous, consisting of 2 articles. Pleopods 2–5 biramous, with exopods larger than endopods.

Uropodal protopod unarmed. Exopod ovate, about 1.1 times as long as wide, truncate on distal margin. Endopod shorter than exopod, about 2.2 times as long as wide; exopod about 2.9 times as long as wide.

Remarks. Mantisgebia multispinosa sp. nov. is the fourth species of the genus. It is remarkably distinguished from the other species of the genus by with numerous spines on cervical groove, hepatic region, and lower margins of the antennular and antennal peduncles. Mantisgebia multispinosa is closely related to M. vonvaupeli Sakai, 2006 in the form of rostrum, being about 2.3 times as long as the basal width (versus about 2.5 times), but it differs markedly from the latter also in the relatively short telson, almost as long as wide (versus about 1.3 times as long as wide).

Etymology. The species name is based on the carapace, antennular and antennal peduncle with numerous spines.

Distribution and habitat. Presently only known from Nansha Islands, South China Sea.

Figures

FIGURE 1. Mantisgebia multispinosa sp. nov., paratype female, MBM 136980 / SSIVB- 26, entire animal, lateral view. Scale = 1 mm.

FIGURE 2. Mantisgebia multispinosa sp. nov., holotype female, MBM 136981 / SSIVB- 28. A, anterior carapace, lateral view; B, anterior carapace, dorsal view; C, maxilliped 3, outer view; D, abdominal somite 6, telson and uropods, dorsal view. Scale = 1 mm.

FIGURE 3. Mantisgebia multispinosa sp. nov., holotype female, MBM 136981 / SSIVB- 28. A, female pereopod 1, outer view; B, female pereopod 1, inner view. Scale = 1 mm.

FIGURE 4. Mantisgebia multispinosa sp. nov. A, holotype female, MBM 136981 / SSIVB- 28. B – C, paratype female, MBM 136980 / SSIVB- 26. A, pereopod 3, outer view; B, pereopod 4, outer view; C, pereopod 5, outer view. Scale = 1 mm.