Fimbriothyris cf. guerangeri ( Deslongchamps, 1856 )

Fimbriothyris cf. guerangeri ( Deslongchamps, 1856)

(Figs 113–115)

1856 Terebratula (Waldheimia) guerangeri , E.-D. – DESLONGCHAMPS, Précigné, p. 304, pl. XVII,

fig. 1. 1871 Terebratula Guerangeri – QUENSTEDT, Petrefactenkunde, p. 301, pl. 45, fig. 92. 1907 Waldheimia tranzensis n. f. – DAL PIAZ, Sospirolo, p. 62, text-fig. 4. 1942 Zeilleria Guerangeri E. Desl. sp. – DUBAR, Multiplissées, p. 51, text-fig. 15, pl. II, fig. 16. 1974 Fimbriothyris guerangeri ( Deslongchamps 1856) – DELANCE, Zeilleridés, p. 279, pl. 6, figs

1–5.

Material – One poorly preserved specimen from Yakacık, Pliensbachian.

Measurements –

L W T Ch

INV 2014.129. 13.4 11.7 6.1 – Remarks – Our specimen is rather poorly preserved, but by its oval outline, straight commissures, the beak characters, the presence of the median septum and first of all the radial multiplication render it the closest to F. guerangeri . The original figures by DESLONGCHAMPS (1856, l.c.) portray a specimen with rather angular anterior part trapezoidal in outline and the illustration of “ Waldheimia tranzensis ” by DAL PIAZ (1907, l.c.) also corresponds to this. Later authors ( DUBAR 1942; DELANCE 1974), on the basis of larger material, expanded the concept of this species and included forms with more oval outlines.

Similar forms, where, in contrast to the typical F. guerangeri , the marginal multiplication appeared only at the anterior margin, have been described and illustrated by TCHOUMATCHENCO (1990, p. 33, pl. V, fig. 1, pl. VII, fig. 7) from Kotel as Fimbriothyris sp. indet., and by VÖRÖS & KANDEMIR (2011, p. 359, figs 5/7, 5/8) from the Eastern Pontides as Fimbriothyris sp. , aff. guerangeri . These probably represent another, closely allied species of Fimbriothyris . F.guerangeri is a Pliensbachian species, rather cosmopolitan in geographical distribution, from the NW-European and the Mediterranean regions to Turkey.