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| Graptolite Net | Graptolites & Graptoliters | Evolution of Graptolites | Cephalodiscoidea | Rhabdopleuroidea |
| 'Rhabdopleura' obuti Durman and Sennikov, 1993 from the late Middle Cambrian of Siberia |
DIAGNOSIS by Durman and Sennikov (1993, pp. 284-285):
"Coenoecium consisting of stolonal and zooidal tubes. Colony habitus largely erect
with limited, encrusting, proximal portion. Stolonal tubes are 0.25 - 0.75 mm wide
with irregular branchings. Sclerotized stolons common showing bifurcation at branch
nodes. Stolon thickness between 60 and 80 micrometers. The erect zooidal tubes
are 6.6 mm long on average widening gradually to an aperture of about 1 mm.
Branching of zooidal tubes occurs quite commonly. No thecal dimorphism or indication
of cortical bandaging. Fusellar structures found throughout the whole colony with
traces of very irregular zig-zag sutures in the stolonal tubes. Fuseller heights vary
75-150 micrometers in stolonal tubes and 50-100 micrometers in zooidal tubes.
Buds and zooids preserved within tubarium with zooids measuring about 0.2 by 0.7
mm."
"Coenoecium consisting of stolonal and zooidal tubes. Colony habitus largely erect
with limited, encrusting, proximal portion. Stolonal tubes are 0.25 - 0.75 mm wide
with irregular branchings. Sclerotized stolons common showing bifurcation at branch
nodes. Stolon thickness between 60 and 80 micrometers. The erect zooidal tubes
are 6.6 mm long on average widening gradually to an aperture of about 1 mm.
Branching of zooidal tubes occurs quite commonly. No thecal dimorphism or indication
of cortical bandaging. Fusellar structures found throughout the whole colony with
traces of very irregular zig-zag sutures in the stolonal tubes. Fuseller heights vary
75-150 micrometers in stolonal tubes and 50-100 micrometers in zooidal tubes.
Buds and zooids preserved within tubarium with zooids measuring about 0.2 by 0.7
mm."
Specimens of 'Rhabdopleura' obuti
origin from a locality on the River
Ukukit (Siberia), Zelenotsvetnaya
Formation, late Middle Cambrian.
To the left you can see the
reconstruction of 'Rhabdopleura'
obuti by Durman and Sennikov
(1993). It shows the colony with
branching zooidal tubes, bifurcating
stolons, terminal bud and feeding
zooids.
FOR RELATED PAGES SEE HERE
origin from a locality on the River
Ukukit (Siberia), Zelenotsvetnaya
Formation, late Middle Cambrian.
To the left you can see the
reconstruction of 'Rhabdopleura'
obuti by Durman and Sennikov
(1993). It shows the colony with
branching zooidal tubes, bifurcating
stolons, terminal bud and feeding
zooids.
FOR RELATED PAGES SEE HERE