Usedomella Gründel, 1998

Gründel, Joachim & Nützel, Alexander, 2013, Evolution and classification of Mesozoic mathildoid gastropods, Acta Palaeontologica Polonica 58 (4), pp. 803-826 : 817

Genus Usedomella Gründel, 1998

Fig. 9I .

Type species: Hyala? laevigatoidea Gründel, 1993 , original designation; Callovian , erratic boulder from North Germany .

Included species: Hyala? laevigatoidea Gründel, 1993 , late Bathonian–Callovian; Usedomella schroederi Gründel, 1998 , Pliensbachian; Usedomella lata Gründel, 1998 , late Bathonian–Callovian; Usedomella magnoconcha Gründel, 1998 , late Bathonian; Usedomella winkleri Gründel, 1999b , late Toarcian; Usedomella cf. laevigatoidea ( Gründel, 1993) sensu Gründel 1999b , Middle Callovian; Usedomella sp. sensu Gründel 2007a, late Toarcian–early Aalenian.

Emended diagnosis.—Shell small, slender; whorls convex; suture deep; protoconch tofanellid, broader than the first teleoconch whorl, consisting of about two whorls; teleoconch whorls including base smooth; growth lines weakly parasigmoidal; aperture round to oval.

Stratigraphic and geographic range.—Pliensbachian to Callovian; Germany, Poland.

Figures

Fig. 9. Type species and examples for Triassic and Jurassic genera of the family Tofanellidae. A, B. Tofanella laevigata (von Münster, 1841), Cassian Formation, Alpe di Specie, Dolomites, N Italy, Late Triassic A. From Bandel (1995: pl. 10: 1). B. From Bandel (1995: pl. 10: 2). C. Cristalloella (Cristalloella) cassiana Bandel, 1995, Cassian Formation, Campo, Dolomites, N Italy, Late Triassic; from Bandel (1995: pl. 10: 9). D. Cristalloella (Wonwalica) minuta Schröder, 1995, Wąwał, Poland, Valanginian; from Schröder (1995: pl. 10: 1). E. Neodonaldina elongata (Zardini, 1978), Cassian Formation, Alpe di Specie, Dolomites, N Italy, Late Triassic. Protoconch (E1) from Bandel (1996: fig. 5d), whole specimen (E2) from Bandel (1996: fig. 6a). F. Graphis rotundata (Gründel, 1998), borehole Heringsdorf 4/63, Germany, middle Callovian; from Gründel (1998: pl. 1: 5). G. Graphis albida (Kanmacher, 1798), Pliocene, Nice/France; from Bandel (2005: fig. 64). H. Camponaxis lateplicata (Klipstein, 1843), Cassian Formation, Misurina, Dolomites, N Italy, Late Triassic; from Bandel (1995: pl. 14: 3). I. Usedomella laevigatoidea (Gründel, 1993), borehole Kłęby 1/37 (formerly Klemmen), Poland, Callovian; from Gründel (1998: pl. 2: 19). J. Urlocella minuera Gründel, 1998, bore Kłęby 1/37, late Bathonian; from Gründel (1998: pl. 1: 11).