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Showing results for tags 'dalmanitid'.
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While going through mostly Amherstburg/Lucas Fm material with some Dundee Fm today, I encountered this fairly large cephalon (~5 cm wide). Odontocephalus (n.sp?) pygidia have appeared in this material, along with Pseudodechenella and Crassiproetus (and just one tiny "Mystrocephala" pygidium). Overall, though, it is miserable, chalk-cherty, bituminous, generally low sedimentation material. It seems a match for Trypaulites, but it seems a bit on the large side (and the exaggerated anterior "prow" gives me pause). Apart from age of the material, I can likely rule out Anchiopsis given the absence of the occipital spine. If it is Trypaulites (making my first cephalon find of this genus), I am not entirely satisfied with making that call more certain on the basis of either images in Ludvigsen or Lespérance. I could be overthinking what could simply be an artifact of preservation or a natural in-genus morphological variation, but always best to get a second opinion.
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- devonian
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Dalmanitid pygidium from the Coeymans Formation
Nautiloid posted a gallery image in Member Collections
From the album: Lower Devonian Helderberg Group in Eastern NY
Dalmanitid pygidium, possibly Odontochile micrurus Lower Devonian Helderberg Group Coeymans Formation© Owen Yonkin 2021
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From the album: Trilobite Sketches and Drawings
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- dalmanitid
- silurian
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