Acanthopyge (Acanthopyge) cf. haueri ( BARRANDE , 1846)

Budil, Petr & Mergl, Michal, 2019, Trilobite Assemblage Of Calceola - Bearing Beds In Acanthopyge Limestone (Choteč Formation, Middle Devonian, Eifelian, Prague Basin, The Czech Republic), Fossil Imprint 75 (1), pp. 79-91 : 81

Acanthopyge (Acanthopyge) cf. haueri ( BARRANDE, 1846)

Text-fig. 3j–k, with some doubts also Text-fig. 3l

L e c t o t y p e. Cranidium NM-L 15148 selected by Šnajdr (1984: 169), figured by Hawle and Corda (1847: pl. 1, fig. 5) as Acanthopyge Leuchtenbergii. Refigured by Barrande (1852: pl. 28, figs 40, 41), Šnajdr (1984: pl. 5, fig. 13) and discussed by Thomas and Holloway (1988: 221–222).

Ty p e l o c a l i t y. Koněprusy near Beroun, the Czech Republic, Acanthopyge Limestone (Middle Devonian, Eifelian).

M a t e r i a l. Two juvenile hypostomes, internal moulds, one fragment of cranidium, one small fragment of pygidium.

R e m a r k s. Two hypostomes enables positive determination as belonging to the juvenile (early holaspid) specimens of Acanthopyge (Acanthopyge) haueri ( BARRANDE, 1846) , which is a common, eponymous species of Acanthopyge Limestone facies. Both hypostomes show all features typical for juvenile specimens of this species – especially coarse, prominent granulation of the middle body and prominent terrace lines on lateral and posterior margin.

One fragment of cranidium ( Text-fig. 3l) possibly also belongs to this species. Only a median glabellar lobe covered by coarse tubercles and spinose tubercles is observable, with a very narrow fragment of supposed bullar lobe. It could not be entirely excluded, however, that this fragment may be a remnant of odontopleurid Ceratocephala WARDER, 1838 – the median lobe does not widen anteriorly, but such a feature is also present in some specimens of Acanthopyge (Acanthopyge) .