BobWill Posted July 16 Share Posted July 16 I'm looking for an explanation for this bryozoan on a stick which came from a Pennsylvanian site in the Deese Group south of Ardmore Oklahoma. The stick is 7 mm long and is attached to the reverse side of what looks like a small piece of fenestrate bryozoan. A close-up shows faint longitudinal striations on the stick but no features are distinguishable on the end. I suppose they may have just been fused in preservation but I'm posting it in case anyone has seen something similar. 1 Link to comment Share on other sites More sharing options...
ynot Posted July 16 Share Posted July 16 Tube worm growing on bryozoan? Link to comment Share on other sites More sharing options...
BobWill Posted July 16 Author Share Posted July 16 6 minutes ago, ynot said: Tube worm growing on bryozoan? Why not? I always see them laying flat against their host so I have to ask if this is something you have seen before. Link to comment Share on other sites More sharing options...
BobWill Posted July 16 Author Share Posted July 16 I just noticed that the stick looks like it flares out a little where it is attached, if that helps. Link to comment Share on other sites More sharing options...
Rockwood Posted July 16 Share Posted July 16 I'm not sure that is a fenestrate bryozoan. The whole thing looks a little wormy to me. Link to comment Share on other sites More sharing options...
TqB Posted July 16 Share Posted July 16 (edited) I believe you have the stem of a fenestellid palaeocorynid appendage, attached to a piece of its colony. They're interpreted as defensive structures that are sometimes found on fenestellids and are quite common at some locations - I've found a few. Paper here: Palaeocorynid-type appendages in Upper Palaeozoic fenestellid Bryozoa Plate 65 from the paper: Edited July 16 by TqB 5 Tarquin Link to comment Share on other sites More sharing options...
BobWill Posted July 16 Author Share Posted July 16 3 hours ago, TqB said: I believe you have the stem of a fenestellid palaeocorynid appendage, attached to a piece of its colony. They're interpreted as defensive structures that are sometimes found on fenestellids and are quite common at some locations - I've found a few. Paper here: Palaeocorynid-type appendages in Upper Palaeozoic fenestellid Bryozoa That has to be it! They are certainly not common here unless I have just been missing them. This one is also unusual since they are said to normally emerge from the obverse side. They wouldn't seem like a very effective defensive member placed on the reverse side but knowing about these gives me something new to watch for. Thanks. 1 Link to comment Share on other sites More sharing options...
Rockwood Posted July 16 Share Posted July 16 Bryozoans are known to construct brood chambers. Do you suppose these could be an elaborate form? Link to comment Share on other sites More sharing options...
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