Bairdoppilata pseudoseptentrionalis Mertens 1956
Creators: name: Antonietto, Lucas Silveira
name: Carmo, Dermeval Aparecido do
name: Viviers, Marta Claudia
name: Neto, João Villar Queiroz
name: Hunt, Gene
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Podocopida
Bairdiidae
Bairdoppilata
Bairdoppilata pseudoseptentrionalis

description: Bairdoppilata pseudoseptentrionalis Mertens, 1956
Fig. 5L
Bairdoppilata pseudoseptentrionalis Mertens, 1956: 182, figs 8.7–8.10, 13.89–13.90. Bairdoppilata pseudoseptentrionalis – Howe & Laurencich 1958: 82, unnumbered figs. — Weaver 1982: 24, figs 4.1–4.3. —?Jarvis et al. 1988: 34, fig. 15j.
Cytherina subdeltoidea Münster, 1830 –? Roemer 1841: 105, fig. 16.22. —? Reuss 1845: 54, fig. 5.38.
Cythere (Bairdia) subdeltoidea – Jones 1849 pars: 23, fig. 5.15a–c, e–f.
Bairdia subdeltoidea –? Jones & Hinde 1890: 5, figs 2.31–2.34.
Bairdia pseudoseptentrionalis – Oertli 1963: pl. 72, pl. 73, fig. l, pl. 76. —? Kaye 1965: 223, figs 2.1, 2.3–2.6. —? Gründel 1966: 15, fig. 1.18. —? Keen & Siddiqui 1971: 63, fig. 1.2. — Hart 1973: 281, fig. 4. —? Babinot et al. 1985a: 172, fig. 5l. 1.
Bairdia sp. – Majoran 1989: 9, figs 2.5–2.7.
Bairdoppilata sp. 1 – Piovesan et al. 2013: 244, fig. 3.8a–b.
non Cythere (Bairdia) subdeltoidea – Jones 1849 pars: 23, fig. 5.15d.
non Bairdia pseudoseptentrionalis – El-Nady et al. 2008: 544, fig. 2.6.
non Bairdia gr. pseudoseptentrionalis – Babinot et al. 1985b: 224, figs 55.15–55.16.
New material examined
BRAZIL: P384 outcrop, Riachuelo Municipality, Sergipe State (MP-1509 to MP-1513), approximate coordinates 10°43' S, 37°12' W; Porto dos Barcos 3 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1460, MP-1468 and MP-1469), approximate coordinates 10°43' S, 37°10' W; São José 1 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1574, MP-1680 and MP-1697), approximate coordinates 10°44' S, 37°13' W.
Type locality and stratum
194 well, Dalum oil field, Germany; Lower Chalk Group, upper Albian.
Measurements
Homeotype (CP-676): carapace: length = 0.91 mm, height = 0.58 mm, width = 0.44 mm.
Homeotype (CP-677): left valve: length = 0.91 mm, height = 0.55 mm.
Remarks
The diagnosis follows Mertens (1956). Historically, Bairdoppilata pseudoseptentrionalis Mertens, 1956 has been mistaken for B. subdeltoidea (Münster, 1830), as the former species has never been adequately illustrated since its description by Münster (1830). Several sub-species were added to Bairdoppilata subdeltoidea during the 19 th century, which increases the difficulties in establishing its current taxonomic status. The most recent review of the species is in Deroo (1956), who renamed it as Bairdoppilata roemeri, with a lower Cretaceous–Tertiary stratigraphic range. Assuming the species is still valid, it has to be separated from Bairdoppilata pseudoseptentrionalis, at least in terms of age; the former is considered later Cretaceous–Tertiary (Münster 1830), while the latter is from the late Albian– Cenomanian (Mertens 1956). The specimens in Kaye (1965), Gründel (1966) and Jarvis et al. (1988) present a straighter posterior portion of the dorsal margin in the left valve, when compared to the more rounded one in B. pseudoseptentrionalis. In Keen & Siddiqui (1971) and Babinot et al. (1985b), the specimens presents a generally wider overlapping and less rounded overall shape.
Paleoecology and distribution
Bairdoppilata pseudoseptentrionalis is a shelf to neritic marine species occurring in the following localities and stages: Anglo-Paris Basin, France, middle Albian (Oertli 1963); Lower Chalk Group, Germany, Albian–Cenomanian (Mertens 1956); Gault, Greensand and Holywell Nodular Chalk (including Plenus Marl Member) Formations, Anglo-Paris Basin, England, Albian–Cenomanian (Jones 1849; Hart 1973; Weaver 1982); Bordj Ghdir Basin, Algeria, lower Cenomanian (Majoran 1989); Florianópolis and Guarujá Formation, Santos Basin, upper Aptian–middle Albian (Piovesan et al. 2013); and in the present work, Angico and Taquari Members, Riachuelo Formation, Sergipe-Alagoas Basin, uppermost Aptian–middle Albian, Aracajuia benderi zone (MSA-0), Sergipella viviersae (MSA-0.2) and Praebythoceratina amsittenensis (MSA-0.3) subzones, Brazil.
description: Published as part of 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, pp. 1-57 in European Journal of Taxonomy 244 on pages 14-15, DOI: 10.5852/ejt.2016.244, http://zenodo.org/record/3850626