Minute Silurian Oncocerid Nautiloids with Unusual Colour Patterns

@inproceedings{Manda2009MinuteSO,
  title={Minute Silurian Oncocerid Nautiloids with Unusual Colour Patterns},
  author={{\vS}. Manda and V. Turek},
  year={2009}
}
A minute Silurian oncocerid Cyrtoceras pollux, from the Prague Basin is assigned here to the genus Pomerantsoceras. The only so far known species of this genus comes from the Upper Ordovician (Hirnantian) of Estonia. Pomerantsoceras thus represents, except for un-revised poorly understood taxa, the single known oncocerid genus surviving the end-Ordovician extinction events. Cyrtoceras pollux is unusual among the Silurian nautiloids because of its small shell. Colour pattern characterised by a… Expand
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References

SHOWING 1-10 OF 91 REFERENCES
Colour Patterns in Early Devonian Cephalopods from the Barrandian Area: Taphonomy and taxonomy
Five cephalopod specimens from the Lower Devonian of Bohemia (Czech Republic) preserve colour patterns. They include two taxonomically undeterminable orthoceratoids and three oncocerid nautiloidsExpand
A revision of the Silurian nautiloid genus Ophioceras Barrande
TLDR
A revision demonstrates that probably only two species of Silurian nautiloid, Ophioceras rudens Barrande, 1865 and O. simplex Barrandi, 1865, can be recognized and an evolutionary connection can be followed between the two species. Expand
Camouflage patterns in Nautilus, and their implications for cephalopod paleobiology
TLDR
‘Ornament’ on ammonoids is seen as camouflage structure, and the principles of camouflage are used to re-assess some facets of cephalopod paleobiology; the life orientation of some early cyrtocones is re-interpreted. Expand
Concentrations of juvenile and small adult cephalopods in the Hirnantian cherts ( Late Ordovician ) of Porkuni , Estonia
The quarry in the north Estonian village of Porkuni provides a succession of shallow−water limestones and cherts span− ning the Ashgillian Normalograptus? extraordinarius graptolite Biozone. ThisExpand
Cephalopoda
  • J. Young
  • Transactions of the Glasgow Geological Society
  • 1871
This last and highest class of the mollusca is represented by six genera and a considerable number of species. They range from the lower to the upper limestone series, but the greatest number andExpand
The fossil record, function, and possible origins of shell color patterns in Paleozoic marine invertebrates
TLDR
The authors propose a hypothesis that involves three developmental phases in the evolution of invertebrate color patterns: the incorporation of metabolic by-products into shells and carapaces as a means of disposal of dietary or metabolic wastes, use of these pigments and patterns as an environmental adaptation, and display during and following the evolution in predators sufficiently sophisticated to see the patterns. Expand
Morphogenetic significance of the conchal furrow in nautiloids: evidence from early embryonic shell development of Jurassic Nautilida
TLDR
The mid-ventral ridge in ammonoids must probably be viewed as an incidental ‘fabricational noise’, whether or not it originates from a so far undocumented optional ridge on the protoconch or from some other structure related to shell development remains an open question. Expand
Connecting ring structure and its significance for classification of the orthoceratid cephalopods
The connecting ring in orthoceratids is composed of two calcified layers: an outer spherulitic-prismatic and an inner calcified-perforate. The spherulitic-prismatic layer is a direct continuation ofExpand
Sublethal punctures in body chambers of Mesozoic ammonites (forma aegrafenestra n. f.), a tool to interpret synecological relationships, particularly predator-prey interactions
The new forma aegrafenestra n. f. sensuHölder (1956) is introduced to describe healed injuries to the body Chambers of Jurassic/Cretaceous ammonites, primarily behind the peristome but normallyExpand
Soft-tissue imprints in fossil and Recent cephalopod septa and septum formation
TLDR
It is suggested that newly formed, not yet mineralized (or only slightly), septa were more tightly stayed between the more numerous lobes and saddles in more strongly folded septa of more derived ammonoids and that the higher tension in these septa did not permit soft-parts to leave imprints on the organic preseptum. Expand
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