Diagnoza

Shell of medium size, adorned with flat, fairly wide folds, tighter at the end of the last whorl on adult specimens, slightly imbricated and with filiform anterior edge and raised posterior edge and thicker, sometimes slightly convex towards the front, more often radial, rectilinear, with dichotomization appearing only under suitably oriented lighting; straight and relatively robust transverse riblets; fairly wide angular umbilicus, with two or three angular, ridge-laden interior coils; showing a broad ventral lobe, with slightly flared sides, with a low median saddle; first lateral saddle broadly rounded; first lateral lobe narrower than first lateral saddle; second side saddle lower and wider than the first; second lateral lobe located on the flank of the umbilicus.

Porównanie

Autekologia

Występowanie geograficzne

Great Britain (Yorkshire, Derbyshire, Lancashire), Ireland (Slieve Anierin), Belgium (Namur, Liege, Hainaut), Germany (Rhenish Slate Mts.), Czech Rep, Poland (Lublin Area, Upper Silesia), Morocco (Tafilalt). 

Zasięg czasowy

Carboniferous, Bashkirian (Namurian, marine horizon 1d and 1b)

Materiały muzealne

Literatura

Bojkowski, K. 1979. Gonatyty z karbonu Górnośląskiego i Lubelskiego Zagłębia Węglowego.  Biuletyn Instytutu Geologicznego 311: 5-68.

Foord, A.H. & Crick, G.C.1897. Catalogue of the fossil Cephalopoda in the British Museum (Natural History). Part III, containing the Bactritidae and part  of the Suborder Ammonoidea).

Korejwo, K. 1969. Stratigraphy and palaeogeography of the Namurian in the Polish Lowland. Acta Geologica Polonica 19 (4): 609-70.

Korejwo, K. 1974. Karbon struktury Abramova. Acta Geologica Polonica 24 (4): 631-661.

Korejwo, K. 1986. Biostratigraphy of the Carboniferous deposits of the Świdnik blocks (Lublin Coal Basin). Acta Geologica Polonica 36 (4): 337-346.

Korejwo, K. & Teller, L. 1971. Karbon struktury Deblina. Acta Geologica Polonica 21 (2): 213-239.

Musiał, Ł. & Tabor, M. 1988. Stratygrafia karbonu na podstawie makrofauny. In. Z. Dembowski & J. Porzycki (eds.), Karbon Lubelskiego Zagłębia Węglowego. Prace Instytutu Geologicznego 122: 88-111.

Řehoř, F. & Řehořová, M. 1972. Makrofauna uhlonosného karbonu československé části hornoslezské pánve. Profil. Ostrava. 136s. pdnve, l-137 . Profil, Ostrava.