Paracypridea langdoni Krömmelbein, 1961

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 : 11

Paracypridea langdoni Krömmelbein, 1961

1961 Paracypridea langdoni n. sp. —Krömmelbein, p. 360–361, pl. 5, figs 29–37.

Diagnosis: A comparatively small Paracypridea species with the following peculiarities: carapace rectangularly rounded; maximum carapace height a long way in front of the centre at the transitional point from the anterior margin to the dorsal margin. Dorsal margin and ventral margin converging slightly towards the posterior. A weak, often only hinted at depression extends from the middle section of the dorsal margin to the centre of the carapace. Rostrum small but always distinct, rounded, and bent in towards the posterior. Post-rostral groove small. Rostral sulcus narrow, shallow, running more or less parallel to the valve margin. The fine sculpture consists of fine but marked dimples. - Form a: posterior margin evenly rounded. - Form b: the lower part of the posterior margin of the left valve is beveled-off in a distinctive way, and in front of it is a small tongue-like projection which overlaps the margin of right valve.

Fig. 2 , 6a–c

Holotype: Carapace, Form b, SMF Xe 3674.

Dimensions: Holotype, length 1.15mm, height 0.64mm.

Fig. 2 , 7a–c

Paratypes: Carapace, Form a, SMF Xe 3673; plus 5 carapaces under SMF Xe 3675 .

Dimensions: Paratype, Form a, SMF Xe 3673, length 1.01mm, height 0.69mm .

Remarks (Bate et al. herein): Forms a and b are dimorphs.

Figures

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 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 7. a = left lateral, b = dorsal, and c = right lateral views. 1a–c. Cypridea tucanoensis Krömmelbein, 1965. Holotype, C, SMF Xe 5338, l 0.94mm, h 0.64mm. 2a–c. Cypridea maior Krömmelbein, 1965. Holotype, C, SMF Xe 5340, l 1.01mm, h 0.68mm. 3a–c. Cypridea subtilis Krömmelbein, 1965. Holotype, C, SMF Xe 5342, l 0.89mm, h 0.58mm. 4a–c. Cypridea suspecta Krömmelbein, 1965. Holotype, C, SMF Xe 5344, l 0.63mm, h 0.39mm. 5a–c. Cypridea (Morininoides) grekoffi Krömmelbein, 1965. Holotype, C, SMF Xe 5346, l 1.29mm, h 0.76mm. 6a–c. Reconcavona imitatrix Krömmelbein, 1965. Holotype, C, SMF Xe 5348, l 0.83mm, h 0.39mm. 7a–c. Candona? pitangaensis Krömmelbein, 1965. Holotype, C, SMF Xe 5350, l 0.94mm, h 0.58mm. 8a–c. Clinocypris? weileri Krömmelbein, 1965. Holotype, C, SMF Xe 5352, l 0.77mm. 9a–c. Tucanocypris camposi Krömmelbein, 1965. Holotype, C, SMF Xe 5354, l 0.94mm, h 0.50mm. 10a–c. Tucanocypris apiculata Krömmelbein, 1965. Holotype, C, SMF Xe 5358, l 0.90mm, h 0.46mm. 11a–c. Petrobrasia marfinensis (Krömmelbein, 1962). ‘Hypotype’, C, SMF Xe 5362, l 0.75mm, h 0.43mm, w 0.30mm. 12a–c. Petrobrasia signum Krömmelbein, 1965. Holotype, C, SMF Xe 5363, l 0.81mm, h 0.47mm.