Cretiscalpellum, WITHERS, 1922

Kočí, Tomáš, Veselská, Martina Kočová & Jagt, John W. M., 2014, Barnacles (Crustacea, Cirripedia, Thoracica) From The Bohemian Cretaceous Basin Described By Fritsch And Kafka (1887), With The Exclusion Of The Family Stramentidae, Acta Musei Nationalis Pragae Series B (Acta Mus. Nat. Prag.) 70 (3 - 4), pp. 223-234 : 225-226

Cretiscalpellum striatum ( DARWIN, 1851)

Pl. 2, fig. 3

*1851 Pollicipes striatus DARWIN, p. 70, pl. 4, fig. 5a-c.

1887 Pollicipes costatus KAFKA: Fritsch and Kafka, p. 9, fig. 15.

1887 Pollicipes striatus DARWIN: Fritsch and Kafka, p. 9, fig. 16.

1887 Pollicipes košticensis KAFKA: Fritsch and Kafka, p. 11, fig. 19.

1889 Pollicipes košticensis KAFKA: Fritsch, p. 95, fig. 116.

1935 Cretiscalpellum striatum (DARWIN): Withers, p. 183, pl. 20, figs. 1–5, 15-21; pls. 21, 22.

M a t e r i a l. NM O4027 (no. 6531), the original tergum described by Kafka (1889, pl. 2, fig. 4).

D e s c r i p t i o n. Tergum elongated, irregularly rhomboidal; apical umbo acute; apicobasal ridge distinct and sharply rounded; occludent margin straight; scutal margin forming angle of 50 degrees with occludent margin; longitudinal lines on carinal part of tergum clear and distinct; scutal margin formed by apicoscutal groove, ending at scutal margin, 2 mm from occludent margin; distinct transverse lines parallel to scutal margin; inner part smooth and with distinct growth lines of carinal fold near carinal margin.

R e m a r k s. The present species has a more elongated tergum than C. glabrum. The main distinguishing features are the sharp longitudinal and transverse lines; these are absent in C. glabrum. Cretiscalpellum paucistriatum (WOODWARD, 1901) has an elongated tergum, which is much less clearly longitudinally striated (almost smooth in some cases) and with a peculiar transverse convexity, while C. naidini Alekseev, 2009 has a strongly convex tergum with a very thick axial portion and a wide occludent rib. The carina of C. sharapovi ALEKSEEV, 2009 has a thick-set apical part which is covered by narrow ribs which are curved into the outer side.

O c c u r r e n c e (B C B). Lower Turonian (Velim, Karlov [recorded by Žítt and Nekvasilová, 1989, p. 86, as Pollicipes costatus KAFKA], Běstvina u Ronova nad Doubravou [recorded by Žítt and Nekvasilová, 1994, p. 26, as Pollicipes costatus KAFKA]; Upper Turonian (Koštice).

O v e r a l l r a n g e. Lower Cenomanian – Upper Maastrichtian.