Tanapseudes vijayapura, Bamber, Roger N., 2013

Bamber, Roger N., 2013, Tanaidaceans from Brunei, IV. The Families Kalliapseudidae, Pagurapseudopsidae, Parapseudidae and Apseudidae (Crustacea: Peracarida: Tanaidacea: Apseudomorpha), with descriptions of a new genus and six new species, Zootaxa 3734 (4), pp. 401-441 : 402-406

Tanapseudes vijayapura sp. nov.

Figs 1–2

Material examined: 1 brooding ♀, holotype (BMNH 2013. 818), sample DA1-1, 05°54′28.5"N 114°38′23.3"E, 20 m depth, sand. 1♀, paratype microslide preparation (BMNH 2013. 819), sample S5C, 04°42′26.5"N 114°26′02"E, 11.5 m depth, sand.

Description of female: body ( Fig. 1 A) slender, 8.6 times as long as wide, holotype 1.9 mm long. Cephalothorax subrectangular with large rounded rostrum, 1.3 times as long as wide, naked, eyes absent. First pereonite one-third as long as cephalothorax; second pereonite 1.4 times as long as first; third and fourth pereonites subequal, twice as long as first pereonite, longer than wide, with single anterolateral setae and paired lateral glandular masses; fifth pereonite just shorter than fourth, as long as wide, with single anterolateral setae; sixth pereonite shortest, half as long as second pereonite, with single anterolateral setae (all pereonites respectively 2.3,

1. Guţu (2006) moved this genus to the Apseudidae based on the single juvenile of his “ Hainanius ” imaculatus Guţu, 2006 that had a spine-like apophysis on the coxa of pereopod 1. As H. nigrifrons (the generotype) does not have such an apophysis (see Shiino 1963; Bamber 1999), it is here retained in the Parapseudidae .

1.3, 0.9, 0.9, 1.0 and 2.1 times as wide as long). Pleon about one-quarter of whole body length, pleonites subequal in length, 2.8 times as wide as long, each two lateral plumose setae on each epimeron. Pleotelson more than twice as long as any pleonite, 1.2 times as long as wide, with paired distal and laterodistal setae ( Fig. 2 E).

Antennule ( Fig. 1 B) proximal peduncle article stout, twice as long as wide, with two outer and two distal inner simple setae and mid-dorsal penicillate seta; second peduncle article one-third as long and half as wide as first article, distally with three penicillate setae and two shorter and three longer simple setae, longest simple seta exceeding tip of antennule; third article half as long as second, with three distal setae; fourth article just longer than third with one fine inner seta at base of accessory flagellum. Main flagellum of three segments, proximal segment twice as long as distal two, with apparently-segmented aesthetasc; second segment with one fine simple seta; third segment half as long as second, distally with five simple setae and apparently-segmented aesthetasc. Accessory flagellum minute, with three distal setae.

Antenna ( Fig. 1 C) proximal peduncle article as long as wide, naked, with slight outer distal apophysis and large inner distal apophysis; second article as long as first, bearing squama with two distal setae; third article half as long as second, with stout inner-distal seta; fourth article 3.5 times as long as third, 2.3 times as long as wide, with mi-length and outer-distal penicillate setae, three inner and one outer distal simple setae; flagellum segments subequal in length, first segment naked, second segment with inner and outer simple distal setae, third segment with four distal setae.

Labrum ( Fig. 1 D) simple, rounded, sparsely setose. Left mandible ( Fig. 1 E) generally typical of genus, palp of one article with two fine mesial setae and distal seta about as long as palp. Labial palp ( Fig. 1 F) densely setose with two distal spines. Maxillule ( Fig. 1 G) outer endite with 11 (?) distal spines, one subdistal seta and setulose outer margin, inner endite with three distal plumose setae, otherwise naked; palp absent. Maxilla typical for genus. Maxilliped ( Fig. 1 H) basis naked, first palp article naked; second palp article with two longer and four shorter inner setae in two rows; third article with four inner setae; distal article with four inner-distal and one outer subdistal setae; endite ( Fig. 1 I) with two coupling hooks, distally with one fine seta and five mainly-blunt spines, outer margin with four setulose setae.

Cheliped ( Fig. 2 A) generally typical of the genus, basis rounded, 1.5 times as long as wide, with mid-ventral spine and ventrodistal seta; merus with two ventrodistal setae; carpus three times as long as wide, with four simple setae along ventral margin; propodus wider than long, with long dorsodistal seta and one simple seta adjacent to dactylus articulation; fixed finger shorter than palm, with two seta on ventral margin, one stout seta adjacent to distal spine, and numerous fine setae along cutting edge; dactylus longer than fixed finger, with three mesial setae.

Pereopod 1 ( Fig. 2 B) basis twice as long as wide, with tuft of dorsoproximal penicillate setae, two unequal ventrodistal simple setae; ischium naked; merus elongate, 0.7 times as long as basis and nearly three times as long as wide, with three dorsal marginal simple setae, ventrodistally with one spine and one seta; carpus 0.7 times as long as merus, dorsally with three marginal setae and distal spine, ventrally with two spines and three interspersed setae; propodus 1.2 times as long as carpus, with mid-dorsal seta, dorsodistal spine, and two ventral spines; dactylus and unguis together 0.6 times as long as propodus, dactylus with two ventral tooth-like apophyses, distal bifurcate seta and small unguis.

Pereopod 2 ( Fig. 2 C) basis 2.7 times as long as wide with ventrodistal seta; ischium with one seta; merus 0.3 times as long as basis, ventrodistally with one shorter seta and pair of longer setae each longer than carpus; carpus 0.9 times as long as merus, ventrally with three spines and one seta, dorsally with two distal setae; propodus 1.4 times as long as carpus, with three ventral spines, distal margin with three spines and four fine setae; dactylus curved, 1.7 times as long as propodus, with fine subdistal seta.

Pereopod 3 similar to pereopod 2. Pereopods 4 and 5 generally typical of genus; ventral margins of merus and carpus sparsely setose.

Pereopod 6 ( Fig. 2 D) basis about three times as long as wide, with ventrodistal seta surpassing distal margin of merus; ischium with ventrodistal seta surpassing distal margin of merus; merus 0.3 times as long as basis, with two dorsal plumose setae and one longer and one shorter ventral setae; carpus 1.2 times as long as merus, with three ventral marginal setae and one dorsodistal seta; propodus as long as wide, 0.7 times as long as carpus, with two ventral and five distal setae; dactylus curved, just longer than propodus.

Pleopods ( Fig. 2 E) with two inner plumose setae on basis; rami subequal in length, all setae plumose, mainly situated distally.

Uropods ( Fig. 2 F) typical of genus, 0.7 times as long as whole pleon; basis with outer-distal seta, without inner-distal spine-like apophysis; exopod three-segmented, endopod with conspicuous inner penicillate setae.

Male unknown.

Etymology: Vijayapura (meaning 'victory' in Sanskrit) was the seventh century name of Brunei given by the occupying Chinese from the Kingdom of Funan; noun in apposition.

Remarks: Unfortunately, the conformation of pereopods 3 to 5 was too unclear in the microslide preparation to allow illustration. However, their morphology was consistent with those of other species in this genus, although their setation was relatively sparse (like that of Tanapseudes ormuzana Bãcescu, 1978 ), and the characteristics figured and described in detail here suffice to characterize this species.

Tanapseudes vijayapura sp. nov. is the fourth species of the genus to be described. It is immediately distinguished from the other three owing to its wide proximal antennular peduncle article (only twice as long as wide, compared with 2.5 to 3 times as long as wide in the other three species), the presence of a mid-ventral spine (rather than a seta) on the cheliped basis, and the inner apophysis on the proximal article of its antenna: Drumm & Heard (2011) cite the lack of such an apophysis in their diagnosis of the genus—the diagnosis thus needs that revision (only).

Otherwise, the morphology of the present species is closely similar to that of the other species in this generally conservative genus. The lack of proximal plumose setae on the pleopod rami and the extreme length of the ventrodistal setae on the merus of pereopod 2 are unusual for the genus. Tanapseudes vijayapura shares only with T. gutui Hansknecht et al., 2002 the four ventral marginal setae on a cheliped carpus that is as much as three times as long as wide (three setae on a carpus that is 2.0 to 2.7 times as long as wide in the other two species), only with T. ormuzana as few as two ventrodistal seta on the cheliped merus (three setae in the other two species), and with both T. gutui and T. sinensis Bamber, 2000 the presence of only one dorsal spine on the propodus of pereopod 1 (two spines in T. ormuzana ; see Bãcescu 1978; Bamber 2000; Hansknecht et al. 2002; Drumm and Heard 2011).

The distribution of the other Tanapseudes species is discussed by Drumm and Heard (2011): T. gutui is found in the Caribbean-Gulf of Mexico region, T. ormuzana in the north-west Indian Ocean, and T. sinensis in Hong Kong.

Guţu & Angsupanich (2005) partially described a specimen of Tanapseudes from the Andaman Sea which they attributed to T. ormuzana ; however, they do show four ventral marginal setae on the cheliped carpus and two ventrodistal setae on the merus, thus like T. vijayapura ; however, the proximal antennular article is 2.5 times as long as wide, and the propodus of pereopod 1 has two dorsal spines, unlike T. vijayapura . Unfortunately, they do not describe the antenna. While the Andaman Sea species is evidently not T. ormuzana , it is not T. vijayapura , nor either of the other two described species.

Figures

FIGURE 1. Tanapseudes vijayapura sp. nov., holotype female, A, body, dorsal (dotted outlines indicate pereonal glandular masses); B, antennule; C, antenna; D, labrum; E, left mandible; F, labial palp; G, maxillule; H, maxilliped; I, maxilliped endite. Scale line = 0.4 mm for A, 0.1 mm for B to I.

FIGURE 2. Tanapseudes vijayapura sp. nov., holotype female, A, cheliped; B, pereopod 1; C, pereopod 2; D, pereopod 6; E, pleopod (plumose nature of all setae not shown); F, uropod. Scale line = 0.2 mm.