Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Abstract

ABSTRACT. The present study is a further contribution to the systematic knowledge of the shallow water marine ostracodes from the Brazilian oceanic islands. A total of 14 species belonging to 10 genera and eight families is herein identified. One new genus and species are described and illustrated: Berguecythere insularis gen. nov., sp. nov. In addition to this new taxon, the abundant species Loxocorniculum tricornatum Krutak, 1971, widely distributed in recent sediments in the Gulf of Mexico, Caribbean, north and northeast of Brazil and the Rocas Atoll, along with the cosmopolitan tropical ostracode Triebelina sertata Triebel, 1948, were also identified at specific level. The remaining 11 species were left at the genus level, and should provide new species. Ecological, zoo-and paleozoogeographical aspects were also briefly discussed.KEYWORDS. Taxonomy, new species, morphology, Atlantic Ocean. RESUMO. Ostracoda (Crustacea) do Arquipélago de São Pedro e São Paulo, Atlântico Equatorial, com ênfase em novo gênero deHemicytheridae. O presente estudo é uma contribuição para o conhecimento da sistemática dos ostracodes marinhos rasos das ilhas oceânicas brasileiras. Um total de 14 espécies pertencentes a 10 gêneros e oito famílias é aqui identificado. Um novo gênero e espécie são descritos e ilustrados: Berguecythere insularis gen. nov., sp. nov. Além desse novo táxon, foram também identificados Loxocorniculum tricornatum Krutak, 1971, espécie abundante amplamente distribuída em sedimentos recentes do Golfo do México, Caribe, norte e nordeste do Brasil e no Atol das Rocas, e o ostracode cosmopolita tropical Triebelina sertata Triebel, 1948. As 11 espécies restantes foram deixadas em nível de gênero e devem fornecer novas espécies. Aspectos ecológicos e zoo-e paleozoogeográficos também foram brevemente discutidos.

The genus Bradleya Hornibrook, 1952 (Crustacea: Ostracoda) in South America and adjacent oceanic areas, with description of a new bradleyine genus

“…None of the studies either in Galapagos or Easter Islands registered living or fossil species of Bradleya. The same occurs in islands off Brazil (Coimbra & Carreño 2012, Antonietto et al 2012, Coimbra et al 2013 and Argentina (Brady 1880, Whatley et al 1995). Bradleya is not reported also by Cusminsky & Whatley (2000) in the Pliocene shelf deposits of the Burdwood Bank (Southwestern Atlantic Ocean).…”

New species of Xestoleberididae (Crustacea, Ostracoda) from Archipelago of São Pedro and São Paulo, Equatorial Atlantic

“…in Rocas. Coimbra et al (2013), as already briefly presented in the introduction of this paper, also discussed preliminarily the two taxa herein formally described. In that paper, the authors outlined a first comparison among the ostracod fauna of three Brazilian oceanic islands (ASPSP, Trindade and Rocas) and discussed the dispersal and potential of colonization of isolated oceanic islands by benthic ostracodes.…”

“…All material examined was collected by Cláudia Pinto Machado, Fernando Erthal and Sandro Monticelli Petró, with the help of the Brazilian Navy crew, during 15 days in July/August 2010. Coimbra et al (2013) present more details of field and laboratorial procedures.…”

“…In recent decades, the study of the Brazilian oceanic islands and their flora and fauna has grown significantly with the financial support of the governmental program known as PROARQUIPÉLAGO. This program is also responsible by the logistical support to the researches performed in the Archipelago of São Pedro and São Paulo, that is a group of very small rocky islets in the Equatorial Atlantic Ocean (Campos et al, 2003;Coimbra et al, 2009Coimbra et al, , 2013antonietto et al, 2012;Coimbra & Carreño, 2012). Coimbra et al (2013) is an important contribution to the knowledge of the ostracod fauna from the Archipelago of São Pedro and São Paulo.…”

“…This program is also responsible by the logistical support to the researches performed in the Archipelago of São Pedro and São Paulo, that is a group of very small rocky islets in the Equatorial Atlantic Ocean (Campos et al, 2003;Coimbra et al, 2009Coimbra et al, , 2013antonietto et al, 2012;Coimbra & Carreño, 2012). Coimbra et al (2013) is an important contribution to the knowledge of the ostracod fauna from the Archipelago of São Pedro and São Paulo. The authors identified and illustrated 14 species, described one new genus and species and leaving the two species of the genus Xestoleberis Sars, 1866, herein described, in open nomenclature.…”