Eusiroides dimorphus 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 : 2087-2089

Eusiroides dimorphus Guedes-Silva, Souza-Filho and Tavares sp. n.

( Figures 10–13)

Type material

Holotype: male (5.4 mm), MZUSP 45151 , PROTRINDADE – Trindade Island , off Espírito Santo, Brazil. Praia do Noroeste, in calcareous algae, diurnal scuba diving, 9.5 m depth, 20.496°S, 29.343°W. J.B. MendonÇa col., 06 August 2018 . Paratypes: 1 male (2.7 mm), MZUSP 45602 , PROTRINDADE – Trindade Island , off Espírito Santo, Brazil . Praia do Noroeste , in calcareous algae, diurnal scuba diving, 9.5 m depth, 20.496°S, 29.343°W . J. B. MendonÇa col., 06 August 2018. 1 female, MZUSP 45608 , ibidem, 06 August 2018 . 1 male (dissected and drawn, 1 slide), MZUSP 45152 , 2 males, 1 female, MZUSP 45613 , ibidem, SECON (Enseada dos Portugueses), diurnal scuba diving, 12.2 m depth, 20.506°S, 29.312° W . J.B. MendonÇa col., 18 July 2013. 1 female (4.62 mm), MZUSP 45603 , ibidem, 10.2 m depth, 20.506°S, 29.312°W . J.B. MendonÇa col., 22 November 2014. 1 male, MZUSP 45609 , ibidem, Ponta da Calheta , artificial reef, 16.7 m depth, 20.505°S, 29.309°W . J.B. MendonÇa col., 24 May 2022. 1 female, MZUSP 45616 , ibidem, Ponta da Calheta , diurnal scuba diving, 9.9 m depth, 20.505°S, 29.309°W . J.B. MendonÇa col., 26 October 2014. 1 male, MZUSP 45617 , ibidem, 17.7 m depth, 20.505°S, 29.309°W . J.B. MendonÇa col., 03 August 2015. 1 female, MZUSP 45610 , ibidem, Parcel / Tartarugas, diurnal scuba diving, 9.5 m depth, 20.517°S, 29.299°W . J.B. MendonÇa col., 26 June 2012. 2 female, MZUSP 45611 , ibidem, Enseada da Cachoeira , diurnal scuba diving, 13.8 m depth, 20.516°S, 29.338°W . J.B. MendonÇa col., 09 July 2012. 1 unsexed, MZUSP 45612 , ibidem, Ponta do Monumento , diurnal scuba diving, 8.1 m depth, 20.503°S, 29.343°W . J.B. MendonÇa col., 13 July 2012. 1 male, MZUSP 45615 , ibidem, Praia dos Portugueses (Rampa nova), diurnal scuba diving, 10.7 m depth, 20.505°S, 29.316°W . J.B. MendonÇa col., 23 April 2014. 1 female, MZUSP 45618 , ibidem, Ponta Norte , diurnal scuba diving, 10.9 m depth, 20.489°S, 29.338°W . J.B. MendonÇa col., 23 July 2018. 1 unsexed, MOUFPE 22043 , ibidem, Ponta Norte , diurnal scuba diving, 15.6 m depth, 20.489°S, 29.338°W . J.B. MendonÇa col., 03 July 2012. 1 unsexed, MOUFPE 22044 , ibidem, Ponta Norte , scuba diving, 14 m depth, 20.489°S, 29.338°W . J.B. MendonÇa col., 23 October 2014.

Diagnosis

Antennae with stout peduncular articles, with calceoli on flagellum. Antenna 1 accessory flagellum 1-articulate, shorter than first proximal article of flagellum. Coxae 1–3 with short spines on posteroventral corner. Gnathopod 1 smaller than gnathopod 2, propodus with palm outer margin dentate bearing eight robust setae and one robust seta defining palmar corner, outer margin dentate and inner margin finely serrate. Epimera 1–2 with one short acute spine on posteroventral corner. Epimeron 3 posterior margin not serrate, with two short curved and acute spines on posteroventral corner. Uropod 2 outer ramus short, 3/4 of inner ramus length. Telson deeply cleft (50%), lobes differ in size, left lobe longer than right.