Colomastix scorpio Guedes-Silva, Souza-Filho and Tavares, 2024

Guedes-Silva, Elkênita, Souza-Filho, Jesser F. & Tavares, Marcos, 2024, Three new species of Amphipoda (Crustacea: Peracarida) from the remote oceanic island of Trindade, off the coast of south-eastern Brazil, Journal of Natural History 58 (45 - 48), pp. 2075-2098 : 2077

Colomastix scorpio Guedes-Silva, Souza-Filho and Tavares sp. n.

( Figures 2–5)

Type material

Holotype, 1 male (1.7 mm, dissected and drawn, 1 slide), MZUSP 45089 , PROTRINDADE, Trindade Island , off Espírito Santo, Brazil, Paredão, diurnal scuba diving, 19 m depth, 20.527° S, 29.304°W, J.B. MendonÇa col., 19 June 2012.

Diagnosis

Head subequal in length to pereonites 1 and 2 combined. Interantennal plate with anteroventral angle not projecting far beyond anterodorsal angle. Antenna 2 peduncle segments 3–5 lacking triangular spinules on lateral margins. Mandibles, maxillae, and outer plates of maxilliped not reduced. Maxilliped basal shell not expanded to form ventral keel. Gnathopod 1 elongate, simple. Gnathopod 2 male propodus with three large subacute (triangular) processes, one defining palmar corner. Pleopods 1–3, inner and outer rami with unequal number of articles. Urosome segment 1 not elongate. Uropod 1 outer ramus reduced, about 1/3 of inner ramus length; inner ramus with a tip resembling a ‘venom gland and stinger of a scorpion’ in lateral view. Telson with two recurved downward spines in lateral view, disto–ventrolateral margin serrate.