Theriosynoecum isoplektum 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

Theriosynoecum isoplektum Krömmelbein & Weber, 1971

Fig. 13 , 1a–c and 2a–c

1971 Theriosynoecum isoplektum n. sp. —Krömmelbein & Weber, p. 57–58, pl. 11, figs 48–49.

Diagnosis: Carapace in lateral view is an extended rectangle in its basic shape. Main sulcus fairly straight, extending down to more than half carapace height, ending at the central muscle field which protrudes outwards most clearly. Anterior sulcus goes forward of the main sulcus right under the dorsal margin and directed diagonally towards the anterior, approximately half the length of the main sulcus. Between the sulci is a triangular valve-swelling, with the tip directed diagonally towards the posterior and upwards, running downwards in the general vaulting of the valve.

Holotype: Carapace ♂?, BfB 7825.

Paratype: Carapace ♀?, BfB 7826.

Dimensions: ♂? Holotype, length 0.77mm, height 0.41mm, width 0.38mm.

Dimensions: ♀? Paratype, length 0.72mm, height 0.38mm, width 0.37mm.

Figures

FIGURE 1. a = left lateral, b = dorsal, and c = right lateral views. 1a–c. Cytheridea bononiensis (Jones) inflata Wolburg. C, T.-K.-Nr. 3182, l 0.83mm, h 0.25mm, w 0.49mm. 2a–c. Cypridea obovata obovata Swain, 1946. C, T.-K.-Nr. 3168, l 1.41mm, h 0.58mm, w 0.88mm. 3a–c. Cypridea obovata (Swain) rhomboidalis Wicher, 1959. Holotype, C, T.-K.-Nr. 3169, l 2.34mm, h 0.86mm, w 1.14mm. 4a–c. Cypridea obovata (Swain) quadrirugosa Wicher, 1959. Holotype, C, T.-K.-Nr. 3170, l 1.56mm, h 0.63mm, w 0.88mm. 5a–c. Cypridea quadrilateralis Swain bibullata Wicher, 1959. Holotype, C, T.-K.-Nr. 3171, l 0.99mm, h 0.45mm, w 0.53mm. 6a–c. Cypridea quadrilateralis Swain inflata Wicher, 1959. Holotype, C, T.-K.-Nr. 3172, l 1.36mm, h 0.66mm, w 0.76mm. 7a–c. Cypridea kegeli Wicher, 1959. Holotype, C, T.-K.-Nr. 3175, l 0.85mm, h 0.39mm, w 0.55mm. 8a–c. Cypridea kegeli bisculpturata Moos in Wicher, 1959. Holotype, C, T.-K.-Nr. 3176, l 0.63mm, h 0.36mm, w 0.25mm. 9a–c. Cypridea nitidula Peck, 1941 Moos in Wicher, 1959. C, T.-K.-Nr. 3177, l 0.97mm, h 0.58mm, w 0.44mm. 10a–c. Cypridea brevicornis Peck, 1941 Moos in Wicher, 1959. C, T.-K.-Nr. 3178, l 1.05mm, h 0.64mm, w 0.43mm. 11a–c. Cypridea acuta Moos in Wicher, 1959. Holotype, C, T.-K.-Nr. 3179, l c. 1.40mm, h 0.72mm, w c. 0.57mm. 12a–c. Cypridea (Pseudocypridina) piedmonti (Roth, 1933) Moos in Wicher, 1959. C, T.-K.-Nr. 3180, l 0.70mm, h 0.12mm, w 0.45mm.

FIGURE 2. a = left lateral, b = dorsal, and c = right lateral views. 1a–c. Gomphocythere forbesii (Jones, 1885) ssp. of Wicher, 1959. Holotype, C ♂, T.-K.-Nr. 3181, l 0.78mm, h 0.43mm, w 0.38mm. 2a–c. Paracypridea quadrirugosa weberi Krömmelbein, 1961. Holotype, C, Form b dimorph, SMF Xe 3661, l 1.82mm, h 1.04mm. 3a–c. Paracypridea quadrirugosa weberi Krömmelbein, 1961. Paratype, C, Form a dimorph, SMF Xe 3660, l 1.45mm, h 0.93mm. 4a–c. Paracypridea similis Krömmelbein, 1961. Holotype, C, Form b, SMF Xe 3667, l 1.23mm, h 0.75mm. 5a–c. Paracypridea similis Krömmelbein, 1961. Paratype, C, Form a, SMF Xe 3666, l 1.20mm, h 0.75mm. 6a–c. Paracypridea langdoni Krömmelbein, 1961. Holotype, C, Form b, SMF Xe 3674, l 1.15mm, h 0.64mm. 7a–c. Paracypridea langdoni Krömmelbein, 1961. Paratype, C, Form a, SMF Xe 3673, l 1.01mm, h 0.69mm. 8a–c. Paracypridea brasiliensis Krömmelbein, 1961. Paratype, C, SMF Xe 3677/1 (ex SMF Xe 3677); l 0.94mm, h 0.65mm, w 0.51mm. 9a–c. Cypridea lunula Krömmelbein, 1962. Holotype, C, SMF Xe 4167, l 0.69mm, h 0.47mm. 10a–c. Cypridea nannorostrata Krömmelbein, 1962. Holotype, C, SMF Xe 4169, l 0.83mm, h 0.47mm. 11a–c. Cypridea histrix Krömmelbein, 1962. Holotype, C, SMF Xe 4173, l 0.94mm, h 0.60mm. 12a–c. Cypridea histricoides Krömmelbein, 1962. Holotype, C, SMF Xe 4175, l 0.87 mm, h 0.54 mm.

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.