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Siphuncle soft-parts in the Upper Jurassic ammonite Kachpurites fulgens

Aleksandr A. Mironenko
Siphuncle soft-parts in the Upper Jurassic ammonite Kachpurites fulgens
Palaios (March 2017) 32 (3): 153-157


Ammonoid soft tissues are rarely preserved and such findings are of considerable interest. Extremely little is known about the structure of ammonoid siphuncle soft-parts. Until now indisputable fossilized siphuncle soft tissues were known only in a few ammonoid genera. This article describes phosphatized soft tissues inside the siphuncle tubes of the Upper Jurassic (upper Volgian) ammonite Kachpurites fulgens from Central Russia. Cross-sectional views of several Kachpurites siphuncles show a large blood vessel in the center surrounded by four smaller ones. In several specimens, the siphuncle epithelium is preserved. The size and arrangement of the blood vessels in Kachpurites is nearly identical to previously described blood vessels in the siphuncles of Recent Nautilus and the Permian prolecanitid ammonoid Akmilleria electraensis This similarity indicates a remarkable conservatism of ammonoid siphuncles and provides grounds for the assumption that the last common ancestors of Ammonoidea and Nautilida also had the same structure of the siphuncle soft tissues.

ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 32
Serial Issue: 3
Title: Siphuncle soft-parts in the Upper Jurassic ammonite Kachpurites fulgens
Affiliation: Russian Academy of Sciences, Geological Institute, Moscow, Russian Federation
Pages: 153-157
Published: 201703
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 33
Accession Number: 2017-026002
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N55°31'60" - N55°46'60", E37°28'00" - E38°04'00"
N57°57'00" - N57°57'00", E38°43'00" - E38°43'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201716
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