Neohornibrookella trindadensis (Coimbra & Carreño, 2012)

Fig. 5: 16–17

1988 Quadracythere producta (Brady). Bold, p. 36, pl. 3, fig. 12 (non)1866 Cythere producta Brady, p. 378, pl. 59, figs. 7a–c.

2012 Tenedocythere trindadensis Coimbra & Carreño, p. 196, figs. 5A–L, tab. 4 (see this paper for a more complete synonymy).

2016 Neohornibrookella trindadensis (Coimbra & Carreño). Warne & Whatley, p. 111.

Figured specimens. MP-O-2860, RV, length: 0.495 mm, height: 0.300 mm; MP-O-2861, LV, length: 0.533 mm, height: 0.324 mm.

Locality. Trindade Island, site Lixo Bay, Sample M17022 N.

Material. Dead assemblage: 59 RV, 69 LV, 209 C, and 69 juveniles. Living assemblage: 1 adult and 4 juveniles.

Remarks. This species, described by Coimbra & Carreño (2012) for Trindade Island, was firstly allocated within the genus Tenedocythere. However, Warne & Whatley (2016), after analyzing a range of species of this genus, found that fossil and living Tenedocythere occur exclusively in the Mediterranean region, placing all species outside this region in the genus Neohornibrookella Jellinek, 1993. Those authors proposed a new subfamily of shallow marine ostracods, Tenedocytherinae, which includes the phylogenetically related genera Tenedocythere, Neohornibrookella, and Bosasella. Neohornibrookella trindadensis was also recorded for the Caribbean region, erroneously identified by Bold (1988) in Late Miocene-Pliocene sediments of the Dominican Republic as Quadracythere producta (Brady, 1866). Yasuhara et al. (2018, 2020) discuss the frequent misidentifications between genera of the Family Thaerocytheridae and with some genera of Hemicytheridae (probably due to their monospecific origin), attributing this mainly to the lack of detailed images of the internal and external morphology of the species.

Stratigraphic range. Late Miocene-Pliocene to Holocene.

Occurrence and distribution. In the study area, the species occurs in Davis and Dogaressa seamounts and Trindade Island in the following localities: Príncipe Beach, Lixo Bay, Racha Island, Orelhas Bay, North Tip, Crista do Galo Pool, Cabritos Beach, Portugueses Bay, Calheta Beach, Andradas Beach and Tartarugas Parcel (Tabs. 3 and 4). It also occurs in other Brazilian territorial waters (Northern shelf and Rocas Atoll). In the fossil record, it occurs in the Dominican Republic (Caribbean Neogene). See references in the synonymy list.