Diagnoza

The elements sp are here generally robust but highly variable, some having prominent high ribs at the occlusal surface that look almost like denticles, others have a relatively thin platform ornamented with rather low sharp ribs  Juvenile specimens develop a platform much above the base but still below the main row of denticles, which makes this population distinct from the co-occurring P. primus which still preserves an ancestral icrion-t)4)e arrangement of denticles, with only an incipient plafform. As commented above, the sp elements in populations of P. primus co-occurring sympatrically with W. inaequnlis show a low population variability, with their occlusal surface invariably developed as an icrion. By contrast, the population variability of P. primus preceding stratigraphically the first Weyerognathu.sin the Muhua and Dzikowiec sections is so wide that both the icrion and platform morphologies can be recognized among specimens of various histogenetic age. Thus either an allopatric speciation event alone was connected with divergent specialisation of the oral surface morphology, or it occured after the already separated species met again sympatrically. No complete record of the phyletic transition is available now, but a dense sampling of the Muhua section may provide it. The largest series of elements of the species come from samples Dz-66 andDz-6. In the Kowala section the first representatives of this lineage, probably W. inaequalis, have been found in sample Ko-46, the presence of the species being better documented by sample Ko-42. The type population of W inaequalis comes from the sample taken 82-97 cmbelow the top of the Hangenberg Limestone at the railroad cut at Hcinnetal near Oberrcidinghausen in the Rhenish State Mountains (Voges 1959: pl. 34: 5l. 52; see also Paproth et al. 1986: fie. l4).

Porównanie

Autekologia

Występowanie geograficzne

Zasięg czasowy

Materiały muzealne

Literatura