Carinathilda Gründel, 1997

Gründel, Joachim & Nützel, Alexander, 2013, Evolution and classification of Mesozoic mathildoid gastropods, Acta Palaeontologica Polonica 58 (4), pp. 803-826 : 807-808

Genus Carinathilda Gründel, 1997

Fig. 3A .

Type species: Carinathilda carinata Gründel, 1997 , original designation; Middle Jurassic ; NW Poland .

Included species: Carinathilda carinata Gründel, 1997 , Bathonian; Carinathilda calteriana Gründel, 1997 , Callovian.

Emended diagnosis.—Protoconch (always?) coaxial; shell moderately broad with two primary spiral ribs and keeled whorls; whorl outline oblique and straight between keel and abapical suture, weakly convex above the keel; base strongly and evenly convex without demarcation to whorl face; weaker secondary spiral ribs and reinforced growth lines form a fine reticulate pattern; a distinct micro−ornament of numerous fine spiral threads is present.

Remarks.—Differences to Angulathilda are discussed below. Jurilda has a more slender teleoconch and the keel is less pronounced. Moreover, Jurilda lacks a distinct micro−ornament.

http://dx.doi.org/10.4202/app.2012.0052

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

Figures

Fig. 3. Type species and examples for Jurassic genera of the family Mathildididae. A. Carinathilda carinata Gründel, 1997, bore Kłęby (formerly Klemmen) 1/37, Poland, Bathonian; from Gründel (1997: pl. 7: 98). B. Angulathilda calloviensis (Gründel, 1997), erratic boulder from Hohendorf near Wolgast 3/96/3, Germany, Callovian; from Gründel (1997: pl. 7: 98, 101). Whole specimen (B1), detail of the ornament (B2). C. Erratothilda erratica (Gründel, 1990), erratic boulder from Bauer−Wehrland, Germany, Callovian; from Gründel (1997: pl. 7: 104, 105). Whole specimen (C1), detail showing ornament (C2).