Macrobrachium mammillodactylus ( Thallwitz, 1892 )

Li, Xinzheng, Bruce, Alexander J. & Manning *, Raymond B., 2004, Some Palaemonid Shrimps (Crustacea: Decapoda) From Northern South China Sea, With Descripitions Of Two New Species, Raffles Bulletin of Zoology 52 (2), pp. 513-553 : 521

Macrobrachium mammillodactylus ( Thallwitz, 1892)

( Fig. 8 )

Palaemon idae var. mammillodactylus Thallwitz, 1892: 15 .

Macrobrachium mammillodactylus - Holthuis, 1950: 148, Fig. 34; Liu et al., 1990a: 109, Fig. 7 ; Chace & Bruce, 1993: 33, Fig. 13 .

Material examined. – 1 female, Haikou, Hainan Is. , fishery market, 18 Jan.1956 ; 2 males, 1 ovig female, CN 90 C-245, Sanya, Hainan Is. , fishery market, coll. H. Chen, 12 Nov.1990 ; 7 males, 17 females (7 ovig) ( IOCAS) , 1 male, 1 female ( ZRC), CN 92 C-1065, Lingao , fishery market, coll. M. Türkay & X. Li, 2 Apr.1992 .

Diagnosis. – Rostrum well developed, with 2-3 + 9-13/2-5 teeth. Mandible stout, palp with 3 segments, covered with long setae, apical segment as long as other 2 segments combined; second pereiopods subequal and similar, chela slightly longer than carpus, palm subcylindrical, as long as carpus, fingers not densely pubescent, partially dentate on proximal opposing margins, palm and carpus covering with small tubercles. Uropod much longer than telson; telson with 2 pairs of posterior marginal spines and 1 pair of setae.

Distribution. – China, Indonesia, Philippines.

Remarks. – Rostrum variable in length, length ratio of second pereiopod segments variable with age. The large chela of the adult male with tubercles on both cutting edges of the dactyl distinguishes it from all closely related species.

Figures

Fig.8. Macrobrachium mammillodactylus (Thallwitz, 1892). a, carapace and anterior appendages, lateral view; b, mandible; c, 2nd pereiopod; d, same, chela and carpus; e, telson and uropod.

Fig. 7. Leptocarpus potamiscus (Kemp, 1917). a, carapace and rostrum; b, mandible, lateral view; c, 2nd pereiopod.

Fig. 13. Urocaridella antonbruuni (Bruce, 1967). a, carapace and rostrum, lateral view; b, mandible; c, thoracic pleuron 3-8, lateral view, show the pleurobranchiae; d, 3rd maxilliped; e, 1st pereiopod; f, 2nd pereiopod; g, abdomen, lateral view; h, telson and uropod, dorsal view; i, tip of telson, dorsal view.