Lateral view of the largest shell known ZPAL Ga.9/86 from the Early Valanginian (Early Cretaceous) of Wąwał

Diagnoza

Protoconch 2 tear−drop−shaped with convex whorls. Suture of  protoconch 2 deeply incised. Ornamentation starting on the last whorl  of protoconch 2 with two spiral ribs situated abapically and passing gradually onto teleoconch. Protoconch demarcated from teleoconch  only by densification of opisthocyrtic, sinusoidal growth lines. Adapical third spiral rib appearing on third teleoconch whorl. Additional weak spiral rib appearing on the fourth whorl. Later in ontogeny, only two strong spiral ribs situated abapically and adapically, distinct with much weaker secondary ribs in between.

Porównanie

The species does not fit to the diagnosis of Haustator and the generic name Turritella in a broad sense is applied to it.

Autekologia

Występowanie geograficzne

Only in type locality

Zasięg czasowy

Early to Late Valanginian (Early Cretaceous).

Materiały muzealne

ZPAL: 113 shells.

Literatura

Allmon, W.D. 1996. Systematics and Evolution of Cenozoic American Turritellidae (Mollusca: Gastropoda) I: Paleocene and Eocene Coastal Plain Species related to  “Turritella  mortoni Conrad” and  “Turritella  humerosa Conrad”. Palaeontographica Americana 59, 1–134.

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 A238, 1–95.