Otarion cf. lacrimarum PŘIBYL et VANĚK, 1981

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 : 85

Otarion cf. lacrimarum PŘIBYL et VANĚK, 1981

Text-fig. 3m

M a t e r i a l. One incomplete exfoliated cranidium.

R e m a r k s. Only one poorly preserved cranidium with corroded glabella does not enable safe affiliation within the tribe Otarionini RICHTER et RICHTER, 1926 , but its general morphology corresponds well with the overall body morphology of Otarion lacrimarum PŘIBYL et VANĚK, 1981 , previously described from the Acanthopyge Limestone. The specimen has been compared with the type material of this species, which is housed in collections of the Czech Geological Survey (prefix CGS), not in the Museum of Senckenberg Institute (prefix SMP) as has been published (unfortunately with low quality of photographs) in Přibyl and Vaněk (1981). The glabella of the studied specimen is relatively elongated, widening slightly anteriorly, mediumvaulted, covered by sparse distinct granules. It differs from the Cyphaspis BURMEISTER, 1843 in having a relatively longer preglabellar field, and markedly lesser convexity of the glabella ( Van Viersen and Prescher 2007, Van Viersen and Holland 2016). This convexity of glabella is, on the other hand, more prominent than in Harpidella MCCOY, 1849 (sensu Adrain and Chatterton 1995). By some features (sparse granulation, sag. length of occipital ring+glabella/ sag. length of cranidium ratio; see Adrain and Chatterton 1995: 308), the studied cranidium is similar to the abovediscussed genus. L1 are not preserved (they are broken off, but the remains of left L1 indicate its large sag. length). Affiliation of the specimen as Otarion cf. lacrimarum seems to be the most likely, although typical elevation at the sag. axis of the preglabellar field (cf. Přibyl and Vaněk 1981: 194) is indistinct in the studied specimen, probably due its corrosion.