Veliger morphs in Pristiograptus, a robust graptoloid from the Ludlow series (Silurian) of Morocco
Barrie Rickards
Acta Palaeontologica Polonica 46 (3), 2001: 447-451
The velum of veliger morphs is a rare, impersistent, delicate structure developed on the thecal apertures of some graptolites, and which may become stabilised in evolutionary descendants, thereby producing a new morphotype. This paper describes their discovery for the first time in the genus Pristiograptus.
Barrie Rickards [wagreen@esc.cam.ac.uk ], Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK.
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