The Carboniferous rhabdopleurid graptolite
Rhabdopleura graysoni Chapman, Durman & Rickards, 1995
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Diagnosis according to Chapman, Durman and Rickards (1995, p. 295):
"Miniscule rhabdopleurid, with colony some 1 mm x 2 mm, comprising at least 9
zoecial tubes, each 0.10 mm in diameter, radiating from origin, or growing in
subparalle bundles; stolons and fuselli identified; fuselli 40 per mm; longest
zooidal tubes 1.25 mm, stolons ?0.02 mm wide, black; a basal structureless layer
probably present; branching not obvious away from origin; crumpled nature of
some tubes suggests they were upright zoecial tubes during life".
To the right you can see the images of Rhabdopleura graysoni.
A. probably upright tubes in sub-parallel bundle.
B. holotype, growing point showing diverging tubes, probaly creeping tubes.
Scal bars 0.5 mm. From Chapman, Durman and Rickards (1995).
Specimens origin from the Pendle Dendroid Bed at Lane Head, Pendle Hill, Lancashire;
Rad Brook Mudstone Member, Pendleside Limestone Formation; Asbian, Carboniferous
The only previously-recorded Carboniferous rhabdopleurid, Rhabdopleura delmeri, was described by G.
Mortelmans (1955) from the late Visean of Belgium.
is prepared and periodically updated by
Piotr Mierzejewski, the Count of Calmont and Countess Maja Anna Korwin-Kossakowska