Robsoniella falklandensis Dingle, 1984

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 : 18

Robsoniella falklandensis Dingle, 1984

Fig. 6A

Robsoniella falklandensis Dingle, 1984: 118 , fig. 8c–f.

Indet sp. A –? Oertli 1974: 947, figs 6.1–6.11.

Robsoniella cf. falklandensis –? Damotte 1992: 826, fig. 1.8.

New material examined

BRAZIL: Porto dos Barcos 3 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1468 and MP-1470), approximate coordinates 10°43' S, 37°10' W.

Type locality and stratum

Not designated.

Measurements

Homeotype (CP-733): right valve: length = 0.72 mm, height = 0.43 mm.

Remarks

The diagnosis follows Dingle (1984). The genus Robsoniella was originally placed in the family Healdiidae Harlton, 1933 by Kuznetsova (1956). After review by Gramm & Kuznetsova (1970), it was separated into its own family, Robsoniellidae Gramm & Kuznetsova, 1970. Dingle (1984) first noted its affiliation to the superfamily Bairdioidea Sars, 1888 , despite classifying it as a Bairdiidae Sars, 1888 . However, it shares several morphological characters with the Bythocyprididae Maddocks, 1969 , as already pointed out by Babinot et al. (2009), although this study gave no further explanation. Bythocyprididae was originally proposed by Maddocks (1969) as a subfamily of Bairdiidae Sars, 1888 , namely Bythocypridinae Maddocks, 1969. Its status was reviewed by Kozur (1972), who elevated it to the family level. Specimens in Oertli (1974) and Damotte (1992) present a very similar general layout in lateral view, although not enough to consider them as being Robsoniella falklandensis .

Paleoecology and distribution

Robsoniella falklandensis Dingle, 1984 is a marine, outer shelf to neritic species occurring in the following localities and stages: Mzinene Formation, South Africa, Cenomanian ( Dingle 1984); and in the Taquari Member, Riachuelo Formation, Sergipe-Alagoas Basin, Brazil, middle Albian, Aracajuia benderi zone (MSA-0), Praebythoceratina amsittenensis subzone (MSA-0.3).