Tangarilda Gründel, 2010

Gründel, Joachim & Nützel, Alexander, 2013, Evolution and classification of Mesozoic mathildoid gastropods, Acta Palaeontologica Polonica 58 (4), pp. 803-826 : 805

Genus Tangarilda Gründel, 2010

Fig. 1B .

Type species: Melania turritella Dunker, 1846 (= Cerithium subturritella Orbigny, 1850 nom. nov.), original designation; Hettangian, Germany.

Included species: Cerithium subturritella d’Orbigny, 1850 , Hettangian; Tangarilda sp. sensu Gründel 2010, Hettangian.

Emended diagnosis.—A genus of the Mathildidae with three primary spiral ribs. The middle and sometimes also the abapical spiral rib are stronger than the others (whorls octagonal in transverse section). The growth lines are asymmetrically opisthocyrt with the backmost point between the adapical and the middle spiral rib. The lowermost part of the growth lines is strongly opisthocline. Secondary spiral ribs may be developed.

Stratigraphic and geographic range.—Hettangian (and Sinemurian?); Germany.

Figures

Fig. 1. Type species and examples for Jurassic genera of the family Mathildididae. A. Mathilda angulata (Gründel, 1997), erratic boulder from Hohendorf near Wolgast 3/96/3, Germany, Callovian; from Gründel (1997: pl. 5: 73). B. Tangarilda subturritella (d’Orbigny, 1850), Kanonenberg near Halberstadt, Germany, Hettangian; from Gründel (2010: pl. 3: 3). C. Jurilda concava (Walther, 1951), borehole Kłęby (formerly Klemmen) 1/37, Poland, Bathonian; from Gründel (1997: pl. 1: 1). D. Tricarilda plana (Gründel, 1973), bore Kłęby (formerly Klemmen) 1/37, Poland, Callovian; from Gründel (1997: pl. 3: 41). E, F. The group of Turritella binaria (Jurilda or Tricarilda). These species were also originally included in Promathildia; see also Fig. 4. E. Alaria clathrata Terquem and Jourdy, 1871, Les Clapes, Bathonian; from Terquem and Jourdy (1871: pl. 4: 7). F. Turritella binaria Hébert and Eudes−Deslongchamps, 1860, La Motte Bourbon, early Callovian, Bayerische Staatssammlung für Paläontologie BSPG 2012 I 22.