Tricarilda Gründel, 1973

Gründel, Joachim & Nützel, Alexander, 2013, Evolution and classification of Mesozoic mathildoid gastropods, Acta Palaeontologica Polonica 58 (4), pp. 803-826 : 806

Genus Tricarilda Gründel, 1973

Fig. 1D .

Type species: Mathilda (Tricarilda) plana Gründel, 1973 , original designation; Callovian ; north−western Poland .

Included Jurassic species: The genus is present with numerous Jurassic species. Some examples are: Tricarilda krumbecki ( Kuhn, 1935) , Aalenian; Tricarilda tareka Gründel, 1997 , Bajocian,?Bathonian; Tricarilda toddi Gründel, Kaim, Nützel, and Little, 2011 , Pliensbachian; Tricarilda striatissima Gründel, 1999b , Bathonian–Callovian; Bathraspira sp. sensu Kollmann 1982, Early Cretaceous; Tricarilda sp. sensu Gründel 2003b, Early Sinemurian; Mathilda schmidti ( Walther, 1951) sensu Kaim (2004) , Bajocian–Early Cretaceous(?); Tricarilda sp. sensu Gründel 2007c, late Sinemurian.

Emended diagnosis.—Similar to Jurilda but the teleoconch immediately with three primary spiral ribs; middle one is strongest, and can be keel−like; additional secondary spiral ribs may lack or are abundant; micro−ornament of spiral striae either absent or weak.

Stratigraphic and geographic range.—The oldest certain member is Tricarilda sp. from the early Sinemurian as reported by Gründel (2003a). Possible Hettangian species which probably belong to the Jurilda – Tricarilda −group are uncertain because their early ontogeny is insufficiently known. The last certain occurrence of Tricarilda is Early Cretaceous ( Mathilda schmidti ( Walther, 1951) sensu Kaim 2004 , Bathraspira sp. sensu Kollmann 1982). However, it is not clear when the genus became extinct. The genus is known from Germany, England, France, Italy, Poland, Russia, Ukraine, New Zealand.

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.