Gymnothilda tomaszina (Schröder, 1995)
Sugerowana cytacja: Gryz, P. 2020. Gymnothilda tomaszina (Schröder, 1995) . Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Gymnothilda+tomaszina)
Diagnoza Shell cone-shaped, 1.72 as high as broad. Protoconch weakly medioaxial, ornamented by adapical and abapical axial folds. Teleoconch starting with two prominent spiral ribs. Abapical rib quickly becoming keel. First two whorls of teleoconch ornamented with opisthocline axial rib, later ribs disappearing. Surface of teleoconch covered by spiral microornamentation. Porównanie An intermediate form between Carinathilda and Gymnothilda. Autekologia Występowanie geograficzne Only in type locality. Zasięg czasowy Valanginian (Early Cretaceous). Materiały muzealne 17 shells. Literatura Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183. Schröder, M.1995. Frühontogenetische Schalen jurassicher und unterkretazischer Gastropoden aus Norddeutschland und Polen. Palaeontographica, Abteilung A 238, 1–95. |
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