A new type of colony in Silurian (upper Wenlock) retiolitid graptolite Spinograptus from Poland

• Autorzy: Kozlowska A. , Dobrowolska K. , Bates D. E. B.
• Języki publikacji: EN

Abstrakty

EN

The new retiolitid species, Spinograptus tubothecalis, is described from the Colonograptus praedeubeli and C. deubeli biozones from two localities in Poland: a borehole on the East European Platform and the Holy Cross Mountains. This was a recovery phase after the severe Silurian Cyrtograptus lundgreni Event. The new species has a unique, previously undescribed form of finite rhabdosome. Unlike the species Spinograptus reticulolawsoni and S. lawsoni, in which the fi− nite rhabdosomes taper distally, its rhabdosome is parallel−sided with the two distal thecae developed as isolated tubes without genicular processes, with a small appendix between them. The new species also has preserved membranes of the sicula, thecae and ancora sleeve, similar to a few species of Spinograptus from the lower Homerian. Spinograptus tubothecalis, like Spinograptus clathrospinosus and S. spinosus, has paired reticulofusellar genicular processes on the pre−thecal ventral orifices, similar to but shorter than thecal processes. Transverse rods, a rare character in post−Cyrto− graptus lundgreni Event retiolitids occur in the new species in rudimentary form.

Słowa kluczowe

EN

new type; colony; Silurian; retiolitid graptolite; Spinograptus; Graptoloidea; Retiolitidae; Poland; paleontology

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2013
• Tom: 58
• Numer: 1
• Opis fizyczny: p.85-92,fig.,ref.

Twórcy

autor

Kozlowska A.

• Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00-818 Warsaw, Poland

autor

Dobrowolska K.

• Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00-818 Warsaw, Poland

autor

Bates D. E. B.

• Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, Ceredigion SY23 3QQ, UK.

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