Cytherelloidea btaterensis Bischoff, 1964

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 : 12

Cytherelloidea btaterensis Bischoff, 1964

Fig. 5 G–I

Cytherelloidea btaterensis Bischoff, 1964: 17 , figs 2.16–2.17, 3.18–3.19.

Cytherelloidea btaterensis – Damotte & Saint-Marc 1972: 277, fig. 1.2. — Rosenfeld & Raab 1983: 92, figs 1.14–1.16. — Honigstein et al. 1985: 12, fig. 3.173.

New material examined

BRAZIL: Fazenda Santa Bárbara outcrop, Rosário do Catete Municipality, Sergipe State (sample MP- 1420), approximate coordinates 10°39' S, 37°01' W; Massapê outcrop, Riachuelo Municipality, Sergipe State (samples MP-1515 and MP-1518 to MP-1520), approximate coordinates 10°06' S, 37°10' W; P384 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1500 and MP-1509 to MP-1513), approximate coordinates 10°43' S, 37°12' W; Penha outcrop, Riachuelo Municipality, Sergipe State (samples MP-1449, MP-1452, MP-1457 and MP-1459), approximate coordinates 10°42' S, 37°13' W; Porto dos Barcos 3 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1474 and MP-1477), approximate coordinates 10°43' S, 37°10' W; São José 1 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1550 to MP-1555, MP-1558, MP-1563 and MP-1565), approximate coordinates 10°44' S, 37°13' W.

Type locality and age

Sample no. 211, Btater Village, Bhamdoun Town, Lebanon; Albian.

Measurements

Homeotype (CP-671): ♀, right valve: length = 0.58 mm, height = 0.30 mm.

Homeotype (CP-672): ♀, carapace: length = 0.59 mm, height = 0.32 mm, width = 0.27 mm. Homeotype (CP-673): ♀, carapace: length = 0.54 mm, height = 0.30 mm, width = 0.23 mm.

Remarks

The diagnosis follows Bischoff (1964). Cytherelloidea btaterensis Bischoff, 1964 resembles Cytherelloidea circumvallata Bonnema, 1941 (middle Albian–early Cenomanian of the Netherlands) ( Bonnema 1941; Gründel 1966), but the latter has an extra central ridge, which is absent in the former. Cytherelloidea knaptonensis Kay, 1963 , from the Albian of Lebanon ( Bischoff 1964), can be separated from the present species by its ornamentation, which does not include reticulations and punctuations between the ridges; also, the shape of the posterior ridge is remarkably different, especially along the dorso-posterior margin. A similar species, Cytherelloidea kayei Weaver, 1982 from the middle–late Cenomanian of England ( Weaver 1982), has thicker ridges overall.

Paleoecology and distribution

Cytherelloidea btaterensis is a marine, shelf to neritic species occurring in the following localities and stages: Levantine Basin, Lebanon, Aptian–Albian ( Bischoff 1964; Damotte & Saint-Marc 1972); Tamun, Hidra, Rama, Yakhini, Yavne Shales and Talme Yafe Formations, Levantine Basin, Israel, Aptian– Albian ( Rosenfeld & Raab 1983; Honigstein et al. 1985); and in the present work, Angico and Taquari Members, Riachuelo Formation, Sergipe-Alagoas Basin, Brazil, uppermost Aptian–Albian, Aracajuia benderi (MSA-0) – Sergipella viviersae (MSA-0.2), Praebythoceratina amsittenensis (MSA-0.3) and Reticulocosta edrianae (MSA-0.4) subzones – and Aracajuia antiqua (MSA-1) zones.

Figures

Fig. 5. [facing page] Ostracods of the Riachuelo Formation, Sergipe-Alagoas Basin, Albian, Brazil. – A–C. Cytherella besrineensis (Bischoff, 1964) comb. nov. A. CP-669, right lateral view. B–C. CP-668. B. Left lateral view. C. Dorsal view. – D–F. Conchoecia? sp. 1. D, F. LBP 10. D. Right lateral view. F. Dorsal view. E. LBP 11, left lateral view. – G–I. Cytherelloidea btaterensis Bischoff, 1964. G. CP-671, right lateral view. H. CP-672, left lateral view. I. CP-673, dorsal view. – J. Cytherelloidea aff. globosa Kaye, 1964, CP-756, right lateral view. – K. Cytherella sp. 1, CP-670, lateral view. – L. Bairdoppilata pseudoseptentrionalis Mertens, 1956, CP-676, right lateral view. – M. Bairdoppilata sp. 1, CP-678, right lateral view. – N–P. Bairdoppilata comanchensis (Alexander, 1929) comb. nov., CP-674. N. Left lateral view. O. Right lateral view. P. Dorsal view. – Q–S. Bairdoppilata sp. 2, CP-757. Q. Right lateral view. R. Left lateral view. S. Dorsal view. Scale bars = 100 μm.