Praebythoceratina trinodosa ( Alexander, 1934 ) Antonietto & Carmo & Viviers & Neto & Hunt, 2016

Antonietto, Lucas Silveira, Carmo, Dermeval Aparecido do, Viviers, Marta Claudia, Neto, João Villar Queiroz & Hunt, Gene, 2016, Ostracoda (Arthropoda, Crustacea) from the Riachuelo Formation, Sergipe-Alagoas Basin, Brazil, Upper Aptian-Albian, European Journal of Taxonomy 244, pp. 1-57 : 25-26

Praebythoceratina trinodosa ( Alexander, 1934) comb. nov.

Fig. 6 K–M

Monoceratina trinodosa Alexander, 1934: p. 64 , fig. 8.10.

New material examined

BRAZIL: São José 1 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1550, MP-1552 to MP-1554, MP-1558, MP-1563 to MP-1565, MP-1571 and MP-1574 to MP-1576), approximate coordinates 10°44' S, 37°13' W.

Type locality and stratum

Fort Worth, Texas, United States; Weno Formation, upper Albian.

Measurements

Homeotype (CP-690): carapace: length = 0.42 mm, height = 0.22 mm, width = 0.22 mm. Homeotype (CP-691): right valve: length = 0.47 mm, height = 0.25 mm.

Homeotype (CP-692): left valve: length = 0.48 mm, height = 0.22 mm.

Homeotype (CP-693): right valve: length = 0.49 mm, height = 0.24 mm.

Remarks

The generic identification follows Becker (1990), while the specific follows Alexander (1934). Despite being poorly preserved, the holotype of Praebythoceratina trinodosa ( Alexander, 1934) comb. nov. presents typical morphological traits that are not common in other Early Cretaceous bythocytherid species – a postero-dorsal tubercle over the lateral u-shaped inflation and the presence of reticulate ornamentation at the central area that slightly fades along adjacent areas – but observable in the present specimens. Compared to P. amsittenensis comb. nov., P. trinodosa comb. nov. is more slender in lateral view and presents more developed antero-dorsal and postero-dorsal tubercles.

Paleoecology and distribution

Praebythoceratina trinodosa comb. nov. is a marine, shelf species occurring in the following localities and stages: United States, upper Albian ( Alexander 1934); and in the present work, Angico and Taquari Members, Riachuelo Formation, Sergipe-Alagoas Basin, Brazil, uppermost Aptian–lower Albian, Aracajuia benderi zone (MSA-0), Sergipella viviersae subzone (MSA-0.2).