Pseudojanira meganesus, Kensley & Schotte, 2002

Kensley, B & Schotte, M, 2002, New species and records of Asellota from the Indian Ocean (Crustacea: Peracarida: Isopoda), Journal of Natural History 36, pp. 1421-1461: 1437-1439

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Pseudojanira meganesus

sp. nov.

Pseudojanira meganesus   sp. nov.

(Žgures 9, 10)

Type material. HOLOTYPE: USNM 253317 View Materials , 4.0 mm, IIOE sta JR-28, Nosy Bé , Madagascar, 13ss29¾S, 48ss14¾E, shallow water, 9 January 1964   . PARATYPES: USNM 253318 View Materials , six 2.8–4.0 mm, two ovigerous 2.9–3.1 mm, three, nine juveniles   , IIOE sta JR-28, same data as holotype   .

Other material. USNM 253319 View Materials , one 2.2 mm   , IIOE sta 357B, oV Natal , South Africa, 29ss11¾S, 32ss02¾E, 69 m, 30 July 1964   ; USNM 253320 View Materials , one, one juvenile   , IIOE sta 372B, oV Inhambane, Mozambique, 24ss48¾S, 34ss59¾E, 42 m, 19 August 1964   ; USNM 253321 View Materials , three, two juveniles   , IIOE sta 403E, north of Beira , Mozambique, 19ss09¾S, 36ss55¾E, 88 m, 9 October 1964   .

Diagnosis. Rostrum broadly rounded, basally wider than midlength, anterior margin having about ten teeth. Cephalon having low rounded bump in position of antennal tooth; anterolateral tooth large, acute, not reaching anteriorly as far as rostrum. Eyes reniform, composed of 13 ommatidia arranged in 2.5 rows. Pleotelson width about one-third greater than middorsal length, lateral margin with single small tooth. Pereopod 1 in male with merus having anterior and posterior patches of elongate setae on mesial surface, stout anterodistal seta present; carpus with anterior and posterior dense patch of elongate setae; propodus longer than wide, widening distally, with band of dense elongate setae on anterior margin, palm demarcated by stout seta, followed by nine or ten more slender fringed setae; dactylus with ten fringed setae on posterior margin. Pereopod 2, ischium having rounded ange on anterior margin bearing six stout setae; merus with anterodistal lobe bearing single stout seta; carpus rectangular, having three stout setae on posterior margin; propodus shorter than carpus, rectangular, with four stout setae on posterior margin; dactylus with two strong ungui plus smaller more proximal seta.

Remarks. The easiest diVerence to detect, between the present species and P. stenetrioides   lies in the rostrum: rounded and entire in the earlier species, rounded and toothed in P. meganesus   . The latter is dorsally very sparsely setose, unlike P. stenetrioides   which is fairly densely setose. The pattern of dense elongate setae on the mesial surface of pereopod 1 in the male diVers between the two species, with a distinctive anterior and posterior patch on both the merus and carpus in P. meganesus   . This species apparently also lacks the strong patch of pigment on the dorsum of the cephalon seen in the earlier species.

The three species of Pseudojanira   recorded from Australia ( P. investigatoris Poore and Just, 1990   ; P. justi Serov and Wilson, 1999   ; P. fremantlensis Serov and Wilson, 1999   ) all possess narrowly triangular rostra, unlike the two western Indian Ocean species.

Etymology. The speciŽc name is derived from the Greek for ‘large island’ referring to the type locality, Nosy Bé in Madagascar.