CRYPTOPLOCINAE Pchelintsev, 1960

Kollmann, Heinz A., 2014, The extinct Nerineoidea and Acteonelloidea (Heterobranchia, Gastropoda): a palaeobiological approach, Geodiversitas 36 (3), pp. 349-383 : 356-358

Subfamily CRYPTOPLOCINAE Pchelintsev, 1960 ( Fig. 3 C-E, H)

Cryptoplocusidae Pchelintsev, 1965: 69.

nella arduensis (Buvignier,1852), Middle Bathonian,Martigny,La-Fosse-aux-Conains ( Aisne , France), MNHN.F.R00036 ; I, J, Eunerinea piettei ( Fischer,1969) , Bathonian , Rumigny (Ardennes, France), holotype MNHN.F.R00289 ; K, Eunerinea bathonica (Rigaux & Sauvage, 1869) ,Bathonian,Rumigny ( Ardennes , France), MNHN.F.A49003 ; L, Eunerinea baillei (Maire,1913) ,Oxfordian, La Mouille ( Haute-Saône , France), MNHN.F.A26139 ; M, Eunerinea defrancei (Deshayes, 1833) , figure from d’Orbigny 1850, Oxfordian, Chatel-Censoir ( Yonne , France), MNHN.F.B12681. Scale bars: A, E, F, 5 mm ; D, 2,5 mm; B, C, G-M, 10 mm.

TYPE GENUS. — Cryptoplocus Pictet & Campiche, 1861 ( 1861: 257) .

TYPE SPECIES. — Nerinea depressa Voltz, 1836 ( 1836:540) .

SUBFAMILY CHARACTERS . — Shells broad coniform to turriculate. Whorls moderately high, flat to strongly concave, broadly rhombic or quadrangular in cross section, columellar and basal lip describing right angle. Periphery of last whorl rounded, base moderately convex, broadly umbilicate. Umbilicus surrounded by a siphonal fasciole. One parietal plait extends diagonally into the whorl interior in Cryptoplocus Pictet & Campiche, 1861 and the synonymous Conoplocus Pchelintsev, 1965 . Wieczorek (1979) mentions an additional columellar plait in early whorls, and a columellar and a palatal plait in Trochalia Sharpe, 1850 .

REMARKS

This diverse group is allocated to the Ptygmatididae because of its siphonal aureole around the umbilicus. Besides the dominant parietal plait, columellar plaits in variable numbers may occur.

Figures

FIG. 3. — Ptygmatididae Pchelintsev, 1960: A, Ptygmatis nodosa (Voltz, 1835) (= Pt. ferruginea Cossmann,1898), Oxfordian, Vieil-St.- Remy (Ardennes,France),MNHN.F.B12828; B, Bactroptyxis trachea (Deslongchamps,1841), Bathonian,Rumigny (Ardennes,France), MNHN.F.A49008; C, Cryptoplocus salomoniana Cotteau,1854,Kimmeridgian,Thury (Yonne,France),MNHN.F.R00331; D, E, Ptygmatis carpathica (Zeuschner,1849),Kimmeridgian,La Combe de Vaux (Ain,France),MNHN.F.A49002; F, Bactroptyxis trachea, Late Bathonian, Poix (Ardennes,France),MNHN.F.A49009; G, Pchelintsevia salinensis (d’Orbigny,1850),Portlandian,Doubs (France);NHMW 1874-LI- 864;H, Ptygmatis pseudobruntrutana (Gemmelaro,1865),axial section,recrystallized shell partly preserved,Kimmeridgian,Ernstbrunn