Lenodus variabilis (Sergeeva, 1963) from the Mójcza Limestone.

Apparatus of Lenodus variabilis (Sergeeva, 1963).

Diagnoza

The anterior process of the P₁ elements with a short bifurcation appearing relatively late in the ontogeny, the P₂ elements with processes widely flaring and with thick and prominently ornamented platform. Strongly asymmetric M elements weakly denticulated with posterior rib without denticles .

Porównanie

Large platform elements of the species (especially P₂ ) show tuberculation, which makes them remotely similar to cooccurring elements of Polonodus. The P₂ elements do not form a mirror-image pair but the difference is not profound. The anterior and inner processes in the dextral element are linearly arranged while in the sinistral element the anterior process is strongly curved, the remaining processes forming a line. No apparent asymmetry was identified in the P₁ pair.

Autekologia

Występowanie geograficzne

Zasięg czasowy

The transition between L. falodiformis and L variabilis took place probably  within the Early Kundan. In the Lesieniec I borehole, in the Polish part of the East European platform, Lenodus occurs together with typical Baltoniodus navis and Paroistodus originalis. The upper range of L. variabilis has not been precisely traced, either. In Mójcza it is replaced 0.5 m below the discontinuity surface with Eoplacognathus zgierzensis and Sagittodontina kielcensis. 

Materiały muzealne

ZPAL

Literatura

Dzik, J. 1994. Conodonts of the Mójcza Limestone. In: J. Dzik, E. Olempska, & A. Pisera. Ordovician carbonate platform of the Holy Cross Mountains. Palaeontologia Polonica 53, 43-128.