Camponaxis Bandel, 1994

Gründel, Joachim & Nützel, Alexander, 2013, Evolution and classification of Mesozoic mathildoid gastropods, Acta Palaeontologica Polonica 58 (4), pp. 803-826 : 816

Genus Camponaxis Bandel, 1994

Fig. 9H .

Type species: Cerithium (?) lateplicatum Klipstein, 1843, original designation; Late Triassic , North Italy .

Included species: Cerithium (?) lateplicatum Klipstein, 1843, Late Triassic; Coronaria subcompressa Kittl, 1894 , Late Triassic; Katosira beneckei Kittl, 1894 , Late Triassic; Camponaxis zardiniensis Bandel, Gründel and Maxwell, 2000 , late Early Jurassic–early Middle Jurassic;? Rotfanella costigera Gründel, 2003c , Callovian (?);? Graphis sp. , cf. costigera Gründel, 2003 sensu Gründel 2007b , Pliensbachian;? Iravadia (Pseudonoba) ponderi Kiel and Bandel, 2003 , Late Cretaceous.

Emended diagnosis.—Shell slender; whorls convex; suture deep; protoconch tofanellid; teleoconch ornamented with strong, straight axial and weak to absent spiral ribs; base convex, not demarcated from whorl face.

Remarks.— Rotfanella costigera and Graphis sp. , cf. costigera differ from typical Graphis −species in size, in having fewer but stronger axial ribs which are not or only weakly parasigmoidal, and in lacking a spiral ornament. According to these characters, they are closer to the type species of Camponaxis and they can be considered to represent descendants of this genus. Iravadia (Pseudonoba) ponderi has also a tofanellid protoconch and the ornament of the first teleoconch whorl (the only preserved one) consists exclusively of relatively few, strong, straight axial ribs. According to its shell shape, protoconch morphology, and teleoconch ornament, this species could also represent a species of Camponaxis . Kiel and Bandel (2003) suggested that Iravadia (Pseudonoba) ponderi resembles? Chevallieria sp. sensu Schröder (1995) (= Usedomella schroederi Gründel, 1998 ) and placed this species in the family Iravadiidae (Rissoidea, Caenogastropoda) .

Stratigraphic and geographic range.—Late Triassic to Early– Middle Jurassic boundary; Callovian to Late Cretaceous questionable; North Italy, Poland,? Germany.

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).