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Siphuncular structure in the extant Spirula and in other coleoids (Cephalopoda)
Swedish Museum of Natural History, Department of Paleobiology. Naturhistoriska Riksmuseet.
2016 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 139, no 2, p. 129-139Article in journal (Refereed) Published
Abstract [en]

The shell wall in Spirula is composed of prismatic layers, whereas the septa consist of lamello-fibrillar nacre. The septal neck is holochoanitic and consists of two calcareous layers: the outer lamello-fibrillar nacreous layer that continues from the septum, and the inner pillar layer that covers the inner surface of the septal neck. The pillar layer probably is a structurally modified simple prisma layer that covers the inner surface of the septal neck in Nautilus. The pillars have a complicated crystalline structure and contain high amount of chitinous substance. The interspaces between the pillars probably are traversed horizontally by numerous chitinous membranes like in the cuttlebone chambers in Sepia. The connecting ring is composed of similar two layers as that in the extant Nautilus: the outer spherulitic–prismatic layer and the inner chitinous layer. The spherulitic–prismatic layer takes its origin on the outer surface of the septal neck, whereas the inner chitinous layer is the non-calcified continuation of the lamello-fibrillar nacreous layer of the septal neck. The siphuncular structure in Spirula is compared with that in the extant Nautilus, fossil nautilosiphonate nautiloids, and five taxa of coleoids.

Place, publisher, year, edition, pages
London, 2016. Vol. 139, no 2, p. 129-139
Keywords [en]
Siphuncular structures, connecting rings, Spirula, pillar layer, coleoid siphuncles
National Category
Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-2621DOI: 10.1080/11035897.2016.1227364OAI: oai:DiVA.org:nrm-2621DiVA, id: diva2:1163805
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/10.1080/11035897.2016.1227364

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