Damaged and flattened shell (OS 76/336) from the Gałęzice syncline (level G4; depth 93,6-95,1 m); originally described as Neoglyphioceras subcirculare (see Żakowa, 1971)

Diagnoza

Shell initially disc-shaped, umbilicus very narrow; ornamentation with about 50 spiral strips; growth lines and shell constrictions mostly at 90° convex-concave and prorsidiate, external projection very high; external lobe is as wide as the adventitious lobe; the median saddle reaches height of 40% of the ventrolateral saddle.

Porównanie

The American L. subcirculare (Miller, 1889) has much fewer spiral ribs.

Autekologia

Występowanie geograficzne

Germany (Rhenish Slate Mts., Harz Mts.), Belgium, Ireland, Great Britain, France,  Spain, Portugal, Morocco, Algeria, Poland (Sudetes, Holy Cross Mts., boreholes Lamki 1, Ostrzeszów), Russia (SE Ural Mts; Tian Shan Mts.), USA (Arkansas, Oklahoma, Texas)

Zasięg czasowy

Carboniferous; Serpukhovian

Materiały muzealne

4 specimens from Gałęzice (Żakowa, 1971).

Literatura

Korn, D. 1988. Die Goniatiten des Kulmplattenkalkes (Cephalopoda, Ammonoidea; Unterkarbon; Rheinisches Schiefergebirge). Geologie und Palåontologie in Westfalen 11: 1–293.

Schmidt, H. 1925. Die carbonischen Goniatiten Deutschlands. Jahrbuch der Preußischen Geologischen Landesanstalt 45 (for 1924), 489–609.

Żakowa, H. 1971. Poziom Goniatites granosus w synklinie galęzickiej (Góry Swiętokrzyskie). Prace lnstytutu Geologicznego 60: 1-137.