Diagnoza

Large conch, suture with asymmetric ventrolateral lobe of parabolic contour.

Porównanie

The holotype (Gürich 1896, pl. 13, 2a-c) is a fragmentary juvenile specimen from the ‘Sacculus Bank” at Łagów-Dule, with the suture closely similar to that in newly collected larger specimens. Some uncertainty remains, because in slightly younger strata at Łagów-Dule Felisporadoceras subvaricatum (Sobolew, 1914) occurs with closely similar suture. The main difference between advanced tornoceratids and cheiloceratids with complex suture is their conch expansion rate, which is expressed in much more extensive dorsolateral saddle in Felisporadoceras. The drawings  show this saddle to be relatively small, which suggests that this is truly Maeneceras.

Maeneceras acutolaterale (Sandberger et Sandberger, 1851) may be a closely related member of the same lineage, more advanced in having acute tips of the ventrolateral saddles. Mature conch of the holotype,  is about 160 mm in diameter. Specimens from Łagów are all juveniles but still they are among the largest goniatites from the Famennian of the Holy Cross Mountains. Growth lines are not recognizable on the conch surface but there are serial internal thickenings visible on the venter. They probably parallel aperture, showing a deep ventral sinus and apparently ventrolateral auricles. Similar is the course of internal thickenings in M. pompeckji (Wedekind, 1918) as illustrated by Bogoslovsky (1971, pl. 13: 5).

Autekologia

Występowanie geograficzne

Łagów Słupecka 73 locality (sample ŁSł73-3) and probably Łagów-Dule; reworked at Sieklucki’s brickpit in Kielce.

Zasięg czasowy

The C. marginifera Zone. 

Materiały muzealne

ZPAL: 3 specimens.

Literatura

Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359.