Macrobrachium lepidactyloides ( de Man, 1892 )

Mazancourt, Valentin De, Marquet, Gerard, Wowor, Daisy & Keith, Philippe, 2024, Macrobrachium ngankeeae, a new species of freshwater shrimp (Crustacea: Decapoda: Palaemonidae) from Papua Barat Province, Indonesia, Zootaxa 5476 (1), pp. 253-266 : 260-261

Macrobrachium lepidactyloides ( de Man, 1892)

Palaemon (Macrobrachium) lepidactyloides de Man, 1892: 497 , pl. 29, fig. 51

Palaemon lepidactylus .— Cowles, 1914: 389, pl. 3, fig. 9 [not P. lepidactylus Hilgendorf, 1879 .]

Macrobrachium hirtimanus . — Holthuis, 1950: 245 [part], fig. 51a.

Macrobrachium lepidactyloides . — Holthuis, 1952: 210, pl. 15, fig.2; Chace & Bruce, 1993: 32, fig. 12; Ito et al. 2006: 23; Chen et al. 2009: 234, tab. 2; Eguia et al. 2009: 31; Keith et al. 2013: 108; Saeki et al. 2018: 35, fig. 2–4, 5A–D, 6.

Type material. Syntype: 1 male (cl 14.7 mm), ZMA De 102.574, Nusa Tenggara Timur Province , Flores Island, Ngada Regency, Mbawa (present: Maumbawa), above waterfall, coll. M. Weber , 1888–1889.

Other material examined. INDONESIA: 1 male (cl 17.4 mm; MNHN-IU-2016-11941) , 1 male (cl 8.4 mm; MZB Cru 5353), Papua Barat Province, Kaimana Regency, Kaimana District , Ds. Jarati, Sg. Kumbawa , 04°09.943’S 133°09.292’E, 77 m asl, coll. P. Keith, P. Gaucher, G. Ségura, 15 October 2010 . PAPUA NEW GUINEA: New Britain: 1 male (cl 16.7 mm), MNHN-IU-2017-9317, Huvenganga R., 05°45.187’S 150°35.001’E, coll. R. Causse, P. Keith, C. Lord, 19 October 2018 ; 1 male (cl 19.0 mm; MNHN-IU-2016-11944), 3 ovigerous females (cl 14.4–17.3 mm; MNHN-IU-2017-9457), Korori R., 05°42.650’S 150°37.693’E, coll. P. Keith, C. Lord, R. Causse, 22 October 2018 ; 1 male (cl 14.4 mm; MNHN-IU-2016-11937), 1 female (cl 9.4 mm; MNHN-IU-2017-932), Wogan R., 5°45.187’S 150°35.001’E, coll. P. Keith, C. Lord, R. Causse, 21 October 2018 ; 1 female (cl 15.7 mm; MNHN-IU-2016- 11935), Vaavu R., 05°22.584’S 150°03.724’E, coll. P. Keith, C. Lord, R. Causse, 30 October 2018 . SOLOMON ISLANDS: Kolombangara : 1 female (cl 12.4 mm; MNHN-IU-2019-341), 1 male (cl 14.3 mm; MNHN-IU-2017- 9438), Lodumoe R., 07°50.961’S 157°04.320’E, coll. P. Gerbeaux, P. Keith, G. Marquet, 15 November 2015 ; 1 ovigerous female (cl 11.7 mm; MNHN-IU-2016-11946), Poitete R., 07°52.413’S 157°07.982’E, coll. P. Keith, C. Lord, G. Marquet, 15 November 2015 . Ranongga: 1 ovigerous female (cl 11.7 mm; MNHN-IU-2017-9441), Mondo R., 08°02.164’S 156°32.163’E, coll. P. Keith, C. Lord, 26 October 2016 ; 1 female (cl 16.7 mm; MNHN-IU-2017- 9317), Kélé Kélé R., 08°02.397’S 156°32.464’E, coll. P. Keith, C. Lord, 27 October 2016 .

Diagnosis. Medium-sized species with subcylindrical body form. Rostrum short, tip reach mid to slightly extend beyond end of second article of antennular peduncle; slender; dorsal carina convex, with total 11–13 teeth, 5 or 6 teeth completely postorbital; ventral carina convex, with 2 teeth. Carapace glabrous. Ocular beak moderately developed. Third maxilliped with exopod shorter than ischiomerus. Second pereiopods robust, dissimilar in shape, unequal in size; distal part of dactylus and pollex of major second pereiopod with double row of tubercles each, fingers about as long as palm, carpus conical, carpus shorter than chela, carpus about as long as merus; cutting edges of minor second pereiopod gaping, densely covered with long stiff setae consealing surface; all articles covered with modified squamiform and mamilliform setae. Third, fourth and fifth pereiopods with modified squamiform setae and few scattered short stiff setae. T4 with median process. Pre-anal carina well developed. Uropods glabrous, exopod with mobile mesial spine longer than distolateral tooth. Developed eggs small, maximum size 0.6 × 0.5 mm, ovoid, numerous.

Distribution. Wide-ranging in the Indo-West Pacific from eastern Indonesia, the Philippines, Taiwan and subtropical Japan to Fiji and French Polynesia.