Camponella Bandel, 1994

Gründel, Joachim & Nützel, Alexander, 2013, Evolution and classification of Mesozoic mathildoid gastropods, Acta Palaeontologica Polonica 58 (4), pp. 803-826 : 814

Genus Camponella Bandel, 1994

Fig. 7A .

Type species: Coelostylina pianozesis Zardini, 1985 , original designation; Late Triassic ; North Italy .

Included species: Only the type species is known.

Diagnosis.—“The small shell has a high spire with numerous flat−sided whorls and distinct suture. The protoconch is coiled sinistral and inclined with respect to the axis of the teleoconch. The first whorls (c. 5) of the juvenile teleoconch are covered with axial and spiral costae, of which the spiral ones are dominant. Later whorls are smooth or have indistinct spiral threads up to the edge of the base, while the base is covered by spiral carinae. The umbilicus is narrow and may form the opening to a hollow columella” ( Bandel 1995: 18).

Remarks.— Camponella and Proacirsa share important characters: Protoconch morphology, ornament of the early teleoconch as well as reduction of this ornament during ontogeny, and broad spiral ribs on the base. Camponella differs from Proacirsa in being much smaller, in having fewer whorls and in having an umbilicus. Camponella is probably ancestral to Proacirsa .

Stratigraphic and geographic range.—Late Triassic; North Italy.

Figures

Fig. 7. Type species and examples for Triassic and Jurassic genera of the family Gordenellidae. A. Camponella pianozensis (Zardini, 1985), Cassian Formation, S Tyrol, Italy, Late Triassic; from Bandel (1995: pl. 8: 7). B. Proacirsa sp., cf. struvii (Lahusen, 1883), Dubki near Saratov, Russia, late Callovian; from Gründel (2005: pl. 5: 12, 16). Whole specimen (B1), protoconch (B2). C. Proacirsa laevigata (Eudes−Deslongchamps, 1843), erratic boulder from Bauer−Wehrland, Germany, Callovian; from Gründel (2000: pl. 1: 15). D. Schafbergia crenata (Stoliczka, 1861), Schafberg near St. Wolfgang, Austria, late Pliensbachian; from Szabó (2008: fig. 87B).