Minamitalitrus zoltani , White, Kristine N., Lowry, James K. & Morino, Hiroshi, 2013

White, Kristine N., Lowry, James K. & Morino, Hiroshi, 2013, A new cave-dwelling talitrid genus and species from Japan (Crustacea: Amphipoda: Talitridae), Zootaxa 3682 (2), pp. 240-248: 242

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Minamitalitrus zoltani

sp. nov.

Minamitalitrus zoltani  sp. nov.

( Figs 2–6View FIGURE 2View FIGURE 3View FIGURE 4View FIGURE 5View FIGURE 6)

Material examined. Holotype, male, 4.4 mm, NSMT-Cr- 22312; Hoshino-do cave, Minami- Daitō jima Island, Okinawa, Japan (25 ° 51 ’ 28 ”; 131 ° 13 ’ 29 ”), 45 m above sea level, Z. Korsós & K. Higashi, col.; 16 October 2011 (404). Paratypes (all female): 7.0 mm, NSMT-Cr- 22313; 6.0 mm, RUMF-ZC-02313; and 4.0 mm, HNHM; same station data. Paratypes, 2 males, 3 females, AM P 90059View Materials, Hoshino-do cave, Minami- Daitō jima Island, Okinawa, Japan, living on live tree roots, collected by Yuji Inagaki in Hamamatsu and Tadashi Yamauchi in Matsuyama, 12 April 1999. Paratypes male, 9.0 mm, NSMT-Cr- 22319 and female, NSMT-Cr- 22318; same station data.

Type locality. Minami –Daitō jima Island (360 km east of Okinawa-jima Island), Japan.

Etymology. Named for one of the collectors, Zoltan Korsós.

Description. Based on holotype, male, 4.4 mm.

Head. Eyes absent. Antenna 2 shorter than head and first 3 pereonites; flagellum 6 -articulate.

Pereon. Gnathopod 1 slightly sexually dimorphic; carpus and propodus with vestigial palmate lobes; propodus subrectangular, anterior margin with 2 groups of robust setae; palm transverse; dactylus slightly longer than palm. Gnathopod 2 not sexually dimorphic; basis slender; ischium without posterodistal lobe on medial surface; posterior margin of merus, carpus and propodus each with lobe covered in palmate setae; carpus well developed (not enclosed by merus and propodus), posterior lobe present, projecting between merus and propodus; propodus subovate, 2.5 × as long as wide; palm obtuse, smooth, not lined with robust setae, posterodistal corner without spine; without cuticular patch at corner of palm; dactylus subequal in length to palm, slender distally. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus similar in length to pereopod 3 carpus; dactylus similar to pereopod 3 dactylus. Pereopod 5 propodus distinctly longer than carpus. Pereopods 6–7 long (1 / 2 length of body); longer than pereopods 3–5. Pereopod 6 shorter than pereopod 7; posterior lobe of basis posteroventral corner rounded, posterior margin perpendicular to ventral margin, posterior lobe with 1–2 marginal setae. Pereopod 7 not sexually dimorphic; basis posterior margin smooth with sparse setae, posterodistal lobe absent; distal articles (merus and carpus) slender; merus posterior margin straight.

Pleon. Pleopods 1–3 biramous, all rami reduced, 1 -articulate; peduncles with 2 retinacula. Pleopod 1 peduncle with marginal slender setae; outer ramus shorter than peduncle, inner ramus longer than outer. Pleopod 2 inner ramus longer than outer, outer ramus shorter than peduncle. Pleopod 3 inner ramus slightly longer than outer, outer ramus shorter than peduncle. Epimeron 2 subequal in length to epimeron 3. Epimeron 3 posterior margin smooth, without setae, posteroventral corner with small subacute tooth, ventral margin without robust setae. Uropod 1 peduncle with 6 robust setae, distolateral robust seta present, small (less than 1 / 4 length of outer ramus), with simple tip; inner ramus subequal in length to outer ramus, with 2 marginal robust setae in 1 row; outer ramus without marginal robust setae. Uropod 2 not sexually dimorphic; peduncle with 2 robust setae; inner ramus slightly longer than outer ramus, with 2 marginal robust setae; outer ramus with 1 marginal robust seta. Uropod 3 peduncle with 1 robust seta; ramus shorter than peduncle, broad, bud-like, with 2 apical setae. Telson as broad as long, apically incised, dorsal midline absent, with marginal and apical robust setae, 2–3 setae per lobe.

Female (sexually dimorphic characters). Based on paratype, female, 7.0 mm. Gnathopod 1 more setose overall than male. Oostegites short, less than 2 × breadth, slightly longer than broad, weakly setose, 2–3 setae with smooth tips. Pleopods 1–3 rami 2 - articulate. Pleopod 3 peduncle with marginal slender setae.

Paratype male (size-related dimorphic characters). 9.0 mm. Similar to the type except for the following: Antenna 2 16 -articulate, basal 2 articles indistinctly articulated. Pereopod 7 basis with posterodistal lobe. Pleopod 1 obscurely 3 - articulate. Pleopod 2 obscurely 2 - articulate. Pleopod 3 1 - articulate. Uropod 1, inner ramus with 5 marginal robust setae.

Ecological type. Cave-hoppers (terrestrial, non-substrate-modifying talitrids).

Distribution. Known only from Minami –Daitō jima Island, Okinawa Prefecture, Japan.


Hungarian Natural History Museum (Termeszettudomanyi Muzeum)