Fragment of a whorl OS-199/86 from trench IVb (sample 4, Goa2 Subzone) in lateral view

Diagnoza

Relatively open umbilicus delimited by a ridge; adult shell with acute venter. Involutely coiled shells with a relatively wide umbilicus; sculpture is formed in the umbilical part by fine transverse lines, which gradually become stronger towards the ventral part of the shell; distances between the transverse lines are greater on the ventral side; quite good developed spiral lines that create characteristic serrations.

Porównanie

May be confused with Girtyoceras meslerianum, from which it mainly differs in irregular distances of increment lines.

Autekologia

Występowanie geograficzne

Germany (7 localities in Rhenish Slate Mts.), Poland (Holy Cross Mts.), Czechia (Nízký Jeseník, Nové Těchanovice)

Zasięg czasowy

Carboniferous; Visean (Goniatites crenistria Zone)

Materiały muzealne

5 fragments from Czechia.

Literatura

Czarniecki, S. 1973. Goniatyty wapienia węglowego z Gałęzic. Annales Societatis Geologorum Poloniae 43 (2): 227-248.

Nicolaus, H.-J. 1963. Zur Stratigraphie und Fauna der crenistria-Zone im Kulm des Rheinischen Schiefergebirges. Beihefte zum Geologischen Jahrbuch 53: 1-246

Żakowa, H. 1992. Nowe dane o karbonie synkliny kieleckiej (Góry Świętokrzyskie). Geological Quarterly 36 (3): 305-326.