''Angarella'' is an early palaeozoic genus of problematic fossils, long held to belong to the
molluscs based on supposed similarities in its musculature to that of
hyolith
Hyoliths are animals with small conical surface, conical animal shell, shells, known as fossils from the Palaeozoic era. They are at least considered as lophotrochozoan, and possibly being lophophorates, a group which includes the brachiopods, w ...
s (now known to be brachiopod relatives
[Moysiuk, J., M. R. Smith, and J.-B. Caron. 2017: Hyoliths are Palaeozoic lophophorates. Nature 541:394–397.]) and
mobergellids, but now considered to represent a
brachiopod based on its calcitic mineralogy and paired symmetrical valves.
Its
dorsal valve is low and conical, whereas its ventral is flat and follows the contours of the substrate, indicating a cementing habit.
[
The dorsal valve bears a series of symmetrical muscle impressions, forming a ring concentric with the edge of the shell. The ventral valve has a pair of internal depressions.][
]
References
Prehistoric brachiopod genera
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