Theriosynoecum ventralatum Krömmelbein & Weber, 1971

Bate, Raymond H., Horne, David J., Horne, Sarah E., Douglas, Lyndsey, Miller, Giles & Lord, Alan R., 2022, Non-marine Ostracoda (Crustacea) of the Early Cretaceous ‘ Pre-Salt’ sediments of Brazil: An illustrated catalogue of the type specimens of Wicher, Krömmelbein, Krömmelbein & Weber, and Bate, Zootaxa 5098 (1), pp. 1-84 : 53-54

Theriosynoecum ventralatum Krömmelbein & Weber, 1971

Fig. 13 , 5a–c and 6a–c

1971 Theriosynoecum ventralatum n. sp. —Krömmelbein & Weber, p. 61–62, pl. 11, figs 52–53.

Diagnosis: A new species of Theriosynoecum with the following peculiarities: carapace approximately irregular trapeziform in lateral outline. The posterior ventral margin is accompanied by a thick fold-like valve-swelling which extends beyond the actual valve margins and forms a broad ventral surface. Shell surface with comparatively weak, net-like fine sculpture.

Holotype: Carapace ♀, BfB 7829.

Paratype: Carapace ♂, BfB 7830.

Dimensions: ♀ Holotype, length 0.90mm, height 0.56mm, width 0.68mm.

Dimensions: ♂ Paratype, length 0.90mm, height 0.55mm, width 0.55mm.

Figures

FIGURE 5. a = left lateral, b = dorsal, and c = right lateral views. 1a–c. Reconcavona swaini Krömmelbein, 1962. Holotype, C, SMF Xe 4238, l 0.79mm, h 0.46mm. 2a–c. Reconcavona centronodosa Krömmelbein, 1962. Holotype, C, SMF Xe 4240, l 0.67mm, h 0.41mm. 3a–c. Reconcavona uncinata Krömmelbein, 1962. Holotype, C, SMF Xe 4242, l 0.73mm, h 0.33mm. 4a–c. Reconcavona uniacantha Krömmelbein, 1962. Holotype, C, SMF Xe 4244, l 0.94mm, h 0.55mm. 5a–c. Ilyocypris sp. in Krömmelbein, 1962. C, SMF Xe 4246. l 0.65mm, h 0.35mm, w 0.31mm. 6a–c. Dolerocypris? marfinensis Krömmelbein, 1962. Holotype, C, SMF Xe 4248, l 0.78 mm, h 0.47 mm. 7a–c. Coriacina coriacea Krömmelbein, 1962. Holotype, C, SMF Xe 4259, l 0.73mm h 0.47mm. 8a–c. Ilhasina remanei remanei Krömmelbein, 1963. Holotype, C, SMF Xe 4650, l 0.76mm, h 0.45mm, w 0.34mm. 9a–c. Ilhasina remanei cuneiformis Krömmelbein, 1963. Holotype, C, SMF Xe 4652, l 0.71mm, h 0.40mm, w 0.40mm. 10a–c. Ilhasina torosa Krömmelbein, 1963. Holotype, C, SMF Xe 5654, l 0.89mm, h 0.54mm, w 0.54mm. 11a–c. Ilhasina amphotera Krömmelbein, 1963. Holotype, C, SMF Xe 4656, l 0.79mm, h 0.38mm, w 0.34mm. 12a–c. Salvadoriella redunca comitans Krömmelbein, 1963. Holotype, C, SMF Xe 4660, l 0.88mm, h 0.48mm, w 0.34mm.

FIGURE 6. a = left lateral, b = dorsal, and c = right lateral views. 1a–c. Salvadoriella redunca posterior Krömmelbein, 1963. Holotype, C, SMF Xe 4662, l 0.95mm, h 0.46mm, w 0.41mm. 2a–c. Reconcavona impar Krömmelbein, 1964. Holotype, C, SMF Xe 4801, length 0.90mm, h 0.52mm, w 0.38mm (without spine). 3a–c. Reconcavona gastracantha Krömmelbein, 1964. Holotype, C, SMF Xe 4803, l 0.75mm, h 0.44mm, w 0.32mm. 4a–c. Reconcavona triebeli Krömmelbein, 1964. Holotype, C, SMF Xe 4805, l 0.74mm, h 0.41mm, w 0.28mm (without spine). 5a–c. Reconcavona agnata Krömmelbein, 1964. Holotype, C, SMF Xe 4808, l 0.99mm, h 0.52mm, w 0.33mm. 6a–c. Reconcavona verruculosa Krömmelbein, 1964. Paratype, C, SMF Xe 4810/1 (ex-SMF Xe 4810). Dimensions of Holotype: l 0.77mm, h 0.44mm, w 0.36mm. Paratype: l 0.75mm, h 0.44mm, w 0.27mm. 7a–c. Paracypridea obovata macacoensis Krömmelbein, 1964. Holotype, C, SMF Xe 4812, l 1.25mm, h 0.76mm, w 0.54mm. 8a–c. Paracypridea similis condylaris Krömmelbein, 1964. Holotype, C, SMF Xe 4814, l 1.25mm, h 0.85mm, w 0.56mm. 9a–c. Paracypridea elegans santantoniensis Krömmelbein 1964. Holotype, C, SMF Xe 4816, l 1.22mm, h 0.73mm, w 0.54mm. 10a–c. Paracypridea elegans inflata Krömmelbein, 1964. Holotype, C, SMF Xe 4818, l 1.02mm, h 0.67mm, w 0.54mm. 11a–c. Paracypridea maacki Krömmelbein, 1964. Holotype, C, SMF Xe 4821, l 0.96mm, h 0.55mm, w 0.53mm. 12a–c. Paracypridea bicallosa Krömmelbein, 1964. Holotype, C, SMF Xe 4824, l 1.08mm, h 0.74mm, w 0.70mm.

FIGURE 13. a = left lateral, b = dorsal, and c = right lateral views. 1a–c. Theriosynoecum isoplektum Krömmelbein & Weber, 1971. Holotype, C ♂?, BfB 7825, l 0.77mm, h 0.41mm, w 0.38mm. 2a–c. Theriosynoecum isoplektum Krömmelbein & Weber, 1971. Paratype, C ♀?, BfB 7826, l 0.72mm, h 0.38mm, w 0.37mm. 3a–c. Theriosynoecum ilhasensis Krömmelbein & Weber, 1971. Holotype, C, BfB 7827, l 0.90mm, h 0.51mm, w 0.51mm. 4a–c. Theriosynoecum trigonalis Krömmelbein & Weber, 1971. Holotype, C, BfB 7828, l 0.79mm, w 0.65mm. 5a–c. Theriosynoecum ventralatum Krömmelbein & Weber, 1971. Holotype, C ♀, BfB 7829, l 0.90mm, h 0.56mm, w 0.68mm. 6a–c. Theriosynoecum ventralatum Krömmelbein & Weber, 1971. Paratype, C ♂, BfB 7830, l 0.90mm, h 0.55mm, w 0.55mm. 7a–c. Theriosynoecum quadrinodosum Krömmelbein & Weber, 1971. Holotype, C ♀, BfB 7831, l 0.70mm, h 0.40mm, w 0.37mm. 8a–c. Theriosynoecum quadrinodosum Krömmelbein & Weber, 1971. Paratype, C ♂, BfB 7832, l 0.70mm, h 0.39mm, w 0.31mm. 9a–c. Theriosynoecum miritiensis Krömmelbein & Weber, 1971. Holotype, C ♀, BfB 7834, l 0.80mm. 10a–c. Theriosynoecum miritiensis Krömmelbein & Weber, 1971. Paratype, C ♂, BfB 7835, l 0.78mm, h 0.48mm, w 0.43mm. 11a–c. Theriosynoecum wicheri Krömmelbein & Weber, 1971. Holotype, C ♂, BfB 8022, l 0.76mm, h 0.42mm, w 0.36mm. 12a–c. Theriosynoecum wicheri Krömmelbein & Weber, 1971. Paratype, C ♀, BfB 8023, l 0.76mm, h 0.43mm, w 0.48mm.