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Characterization of two new superorders Nautilosiphonata and Calciosiphonata and a new order Cyrtocerinida of the subclass Nautiloidea: siphuncular structure in the Ordovician nautiloid Bathmocerass (Cerphalopoda)
Swedish Museum of Natural History, Department of Paleobiology. Naturhistoriska Riksmuseet.
2015 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 137, no 3, p. 164-174Article in journal (Refereed) Published
Abstract [en]

Based on differences in the siphuncular structures, the subclass Nautiloidea is divided into two new superorders: Nautilosiphonata and Calciosiphonata. The first superorder is characterized by the nautilus-type of connecting rings, and the second superorder by calcified-perforate type of the connecting rings. A new order Cyrtocerinida is erected for the families Bathmoceratidae, Cyrtocerinidae and Eothinoceratidae, previously included in the order Ellesmeroceratida. The siphuncular structure in the Ordovician nautiloid Bathmocerasholmi n. sp. is described. It is characterized by (1) connecting rings that are composed of an outer, calcareous, spherulitic–prismatic layer and an inner, fibrous, chitinous layer, and (2) prominent siphuncular ridges that originate from the inner surfaces of the connecting rings. The structure of the siphuncular ridges in Bathmoceras is compared with that of the actinosiphonate lamellae in the Silurian oncocerid nautiloid Octamerella.

Place, publisher, year, edition, pages
London, 2015. Vol. 137, no 3, p. 164-174
Keywords [en]
Palaeozoic nautiloid cephalopods, siphuncle, superorders Nautilosiphonata, Calciosiphonata, order Cyrtocerinida, Bathmoceras
National Category
Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-2620DOI: 10.1080/11035897.2015.1061592OAI: oai:DiVA.org:nrm-2620DiVA, id: diva2:1163798
Note

No funding indicated.

Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2017-12-15Bibliographically approved

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Publisher's full texthttp://www.tandfonline.com/doi/full/10.1080/11035897.2015.1061592

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