UMBONEINAE

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

Subfamily UMBONEINAE Lyssenko & Aliev, 1987

( Fig. 3G )

Umboneidae Lyssenko & Aliev, 1987: 117

TYPE GENUS. — Umbonea Pchelintsev, 1965 ( 1965: 85) .

TYPE SPECIES. — Nerinea dilatata d’Orbigny, 1852 (1852: 146) .

SUBFAMILY CHARACTERS . — Shells with hollow columella; whorls almost triangular in outline, siphonal notch located on acute extension of aperture. The columellar, parietal and palatal plaits are small. The umbilicus may be covered by a thin lamella.

REMARKS

This group is assigned to the Ptygmatididae because of the typical siphonal portion which protrudes at about 60° into the umbilicus. It has been named Diozoptyxisidae by Pchelintsev (1965). Diozoptyxis Cossmann, 1907 belongs, in fact, to the Campaniloidea (see Kollmann & Peza 1997 a; Kollmann 2005). Ptygmatididae species originally assigned to this family are allocated to the Umboneinae Lyssenko & Aliev, 1987.

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