Holotype ZPAL Ga.9/186 from  Early Valanginan (Early Cretaceous) of Wąwał in lateral and apical view; white arrows indicate demarcation between protoconch and teleoconch.

Diagnoza

Mammillated protoconch, highly conical, with first 1.5 whorls not ornamented. Rest of the protoconch ornamented with opisthocline axial  ribs; spiral lirae not present. Demarcation from teleoconch clearly visible, sinusoidal with sinusigera lip. Teleoconch ornamented with strong axial ribs and blunt axial ribs.

Porównanie

Protoconch typical of members of the family Nystiellidae and it may represent the earliest known member of the family. A very similar shell in Acirsa sp. Bandel, 1991 from Late Cretaceous of North America.

Autekologia

Występowanie geograficzne

Only in type locality.

Zasięg czasowy

Sample G1, Busnardoides campylotoxus Zone, Early Valanginian (Early Cretaceous).

Materiały muzealne

ZPAL: only holotype

Literatura

Bandel, K. 1991. Über triassische »Loxonematoidea« und ihre Beziehungen zu rezenten und paläozoischen Schnecken. Paläontologische Zeitschrift 65, 239–268.

Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183.