Brachythyris ufensis Tschernyschev

Click on pictures to magnify

Discussion:

This brachiopod has a rounded outline with a short hingeline at all
growth stages and has wide smooth-topped radial ribs with a low
fold and sulcus.

Viewer comments:

The age range of Brachythyris is not reported to extend to strata as
young as the Gzhelian, but this species fits the genus concept well
and appears to be a typical member of the genus.

The large photo of the bivalved specimen shows that most
of the shell has small concentric circles marked by white lines,
the surface expression of beekeite rings, indicating that the shell
is mostly replaced with silica. There is a large boring through the
sulcus of the specimen that may be a predatory boring or be a
boring made by an organism excavating a chamber.

Tom Yancey

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Phylum Brachiopoda (brachiopods)
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