Swantina swantia ( Schallreuter, 1975 )

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

Swantina swantia ( Schallreuter, 1975)

Fig. 5I–L.

1983 Ampletochilina swantia Schallreuter, 1969 ; Schallreuter 1983a: 169, 191, table 16, pl. 13: 4 (p. 169 further synonymy).

1986 Swantina swantia ( Schallreuter, 1969) ; Schallreuter (1986): 9.

Holotype: Female left valve, GG 25−8 ( Schallreuter 1969: fig. 1.1–2). Catalogue of Herrig and Nestler no. 37, catalogue of Keyser and Schöning 1996 no. 96.

Type locality: Beach of the Dornbusch, Isle of Hiddensee (Baltic Sea); erratic boulder.

Type horizon: Swedish Backsteinkalk (erratic boulder 1B16), age: like Skagen limestone, lower Upper Ordovician.

Material.—More than 70 valves (including 20 females).

Dimensions and proportions.—See Schallreuter (1969: 347, 1975: table 9).

Diagnosis (emended).—Females mostly between 1.00 and 1.20 mm long. Outline rounded to rectangular, amplete or subamplete. Cardinal angles only slightly exceed 90 °. Domicilium weakly convex. Rounded muscle spot clearly in front of centre, mostly not very distinct and not depressed. Velar frill restricted, terminating in the posteroventral region with a short spine in line with the cardinal corner. Frill in tecnomorphs narrow, in females broader and slightly convex. Antrum terminating rather distinctly far in front of terminal velar spine at the border between centroventral and posteroventral regions. Marginal sculpture developed as ridge and dimorphic in being broader at the antrum. Antrum bordered at either side by special antral fences. Lateral surface pustulate.

Stratigraphic and geographic range.—See Schallreuter (1983a: 169).