Uchtovia refrathensis (Krömmelbein, 1954), Krommelbein, 1954

Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel & Posada, Luis-Carlos Sánchez De, 2016, Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications, Zootaxa 4068 (1), pp. 1-78 : 30-31

Uchtovia refrathensis (Krömmelbein, 1954)

(Pl. II: Figs. 9 & 10)

1954a Sulcella refrathensis nov. sp.; Krömmelbein: 250, pl. 1, fig. 5.

1954a Cavellina abundans Pokorńy, 1951 ; Krömmelbein: pl. 2, fig. 13.

1954a Cavellina sulcelloides nov. sp.; Krömmelbein: pl. 1, fig. 4.

1959 Uchtovia abundans ( Pokorńy, 1951) ; Rozhdestvenskaja: pl. 10, figs. 1–5. 1969 Sulcella refrathensis Krömmelbein ; Groos: 53, pl. 9, fig. 2.

1982 Uchtovia ? sp. 1; Milhau: 23, pl. 6, fig. 159.

1983a Uchtovia refrathensis (Krömmelbein) ; Milhau: 351.

1983 Uchtovia refrathensis (Krömmelbein) ; Żbikowska: 45, pl. 10, figs. 3–7. 1993 Uchtovia refrathensis (Krömmelbein) ; Malec & Racki: 362, 368, 374, 376, text-figs. 4G–K.?1993 Uchtovia refrathensis (Krömmelbein) ; Kasimi: pl. 17, fig. 2.

2009 Uchtovia refrathensis (Krömmelbein) ; Casier in Casier & Préat: pl. 4, fig. 19. non 2009 Uchtovia sp. A, aff. refrathensis (Krömmelbein) ; Casier in Casier & Préat: pl. 4, fig. 20. 2010 Uchtovia refrathensis (Krömmelbein) ; Maillet: 40, pl. 4, fig. 11.

non 2011b Uchtovia refrathensis (Krömmelbein) ; Casier in Casier et al.: pl. 2, fig. 8. 2013 Uchtovia refrathensis (Krömmelbein) ; Casier & Maillet in Casier et al.: 254, 264, fig. 9E. 2013 Uchtovia refrathensis (Krömmelbein) ; Maillet: 88, pl. XI, figs. 7–9.

2013b Uchtovia refrathensis (Krömmelbein) ; Maillet et al.: fig. 8J.

2013 Uchtovia refrathensis (Krömmelbein) ; Casier in Casier & Préat: 488, pl. III, fig. 14.

Material. 74 specimens (62 C, 7 V, 5 F).

Diagnosis. Krömmelbein (1954a, p. 252).

Description. Medium-sized elongated and sub-oval carapace. The larger RV overlaps the LV on whole outline, except on the dorsal margin from ½ to ¾ of Lmax. Hmax at 1/3 anterior; Lmax almost median (slightly dorsal); Wmax almost median. Dorsal margin oblique both anteriorly (on 2/3) and posteriorly (on 1/3). Antero-dorsal long and narrow stragulum. Almost straight ventral margin, slightly concave at mid-length on the largest valve. Dorsal and ventral margins almost parallel (carapace slightly posteriorly slender). Well rounded anterior margin, regularly convex. Well rounded posterior margin, more arched than the anterior one. Anterior part slightly higher than the posterior one. Surface smooth. Shoulder in the posterior part, extending from dorsal to ventral margins and parallel to the posterior margin. Posterior end consequently sharp in dorsal view. Marked “U”-shaped adductorial sulcus at mid-dorsal, slightly oblique towards anterior, extending from the dorsal margin to the centre of valves. Another slighter sulcus in the antero-dorsal part.

Discussion. A marked sexual dimorphism has been observed, with heteromorphic carapaces larger, more elongate and flatter than tecnomorphic ones, and with an indistinct shoulder.

Occurrence. Upper Givetian to Lower Frasnian (Fromelennes Fm, Fort Hulobiet Mb, and Nismes Fm), Ardenne (Flohimont, Nismes, Sourd d’Ave, Cul d’Houille and Aisne sections), Upper Givetian to Lower Frasnian (Candás Fm, mbs C and D), Asturias (Peran-Perlora section); Middle Devonian, Eifel, Ruhr and Poland; Upper Devonian, Russia.