Swantina Schallreuter, 1986

Schallreuter, Roger E. L. & Hinz-Schallreuter, Ingelore C. U., 2010, Sexual dimorphism and pore systems in Ordovician ostracodes, Acta Palaeontologica Polonica 55 (4), pp. 741-760 : 754

Genus Swantina Schallreuter, 1986

Type species: Ampletochilina swantia Schallreuter, 1969 , Isle of Hiddensee (Baltic Sea), erratic boulder of Backsteinkalk of younger Swedish type (age like Keila stage of Estonia, D2) .

Species included.— Swantina serrata Schallreuter, 1986 ; Swantina pseudobliqua Schallreuter, 1986 ; Swantina schallreuteri Olempska, 1994 ; Swantina crassiconvexa sp. nov.

Diagnosis (emended).—Small to medium−sized. Outline amplete or preplete. Non−sulcate and non−lobate. Velar frill restricted. Dolon slightly convex or strongly convex centroventrally. Antrum open anteriorly, closed posteriorly. Marginal sculpture dimorphic, developed as row of spines and/or ridge. Lateral surface pustulate.

Remarks.— Sidaravičienė (1992: 142) cited Neben and Krueger (1973) as authors of the genus but in that paper the name is a nomen nudum ( Schallreuter 1975: 160).

Swantina differs from Levisulculus mainly by the generally amplete outline and the antrum, which is weakly convex in all parts.

Ectoprimitia is distinct from Swantina mainly by presence of a dorsal plica and the antrum, which is more distinctly bordered anteriorly than posteriorly.

Stratigraphic and geographic range.—Upper Ordovician of Baltoscandia.