Abrupt changes in distance between succeeding septa at the hatching time in modern coleoids Sepiella japonica and Spirula spirula

Analyses of distances between succeeding septa throughout ontogeny of modern coleoids Sepiella japonica and Spirula spirula reveal that the first several septa (until ca. 6th–8th septa in Sepiella japonica and until ca. 2nd–3rd septa in Spirula spirula ) have relatively larger septal distances than...

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Bibliographic Details
Published in:	Swiss journal of palaeontology Vol. 134; no. 2; pp. 301 - 307
Main Authors:	Yamaguchi, Ayaka, Kumada, Yuichiro, Alfaro, Andrea C., Wani, Ryoji
Format:	Journal Article
Language:	English
Published:	Basel Springer Basel 01-11-2015 Springer Nature B.V
Subjects:	Earth and Environmental Science Earth Sciences Hatching Ontogeny Paleontology Sepiella japonica Septum Spirula spirula Hatching Septa Ontogenetic change
Online Access:	Get full text
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Summary:	Analyses of distances between succeeding septa throughout ontogeny of modern coleoids Sepiella japonica and Spirula spirula reveal that the first several septa (until ca. 6th–8th septa in Sepiella japonica and until ca. 2nd–3rd septa in Spirula spirula ) have relatively larger septal distances than the following septa and then the distances between succeeding septa abruptly decrease at the time of hatching for both species, which are known from previous rearing observations and stable isotopic analyses. If this relationship holds in fossil cephalopods preserving internal shells, their paleo-hatching timings could be reconstructed through the ontogenetic analyses of their septal distances.
ISSN:	1664-2376 1664-2384
DOI:	10.1007/s13358-015-0078-x