open access

Vol 75, No 2 (2016)
ORIGINAL ARTICLES
Published online: 2015-10-09
Submitted: 2015-05-31
Accepted: 2015-08-11
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Comparative anatomy of pectoral girdle and pectoral fin in Russian sturgeon and American paddlefish

K. Grom, E. Pasicka, K. Tarnawski
DOI: 10.5603/FM.a2015.0093
·
Pubmed: 26503180
·
Folia Morphol 2016;75(2):173-178.

open access

Vol 75, No 2 (2016)
ORIGINAL ARTICLES
Published online: 2015-10-09
Submitted: 2015-05-31
Accepted: 2015-08-11

Abstract

Acipenseriformes occupy an important place in the evolutionary history. Skeleton of their pectoral fins has elements related to teleosts, but also to tetrapods. This article summarises and compares anatomical structure of the pectoral girdle and pectoral fin of Russian sturgeon (Acipenser gueldenstaedtii) and American paddlefish (Polyodon spathula). These species possess pectoral fins with some distinctive features in their structure. The pectoral girdles are composed of both cartilaginous and ossified elements. Unlike sturgeons, American paddlefish does not have an interclavicle and suprascapular cartilage. Moreover, its cleithrum doesn’t form medially directed lamina. The quantity of the proximal radials in the investigated fish species are not the same. The dorsal and ventral muscles, which act on the pectoral fin of Russian sturgeon and American paddlefish, are not equally developed. In our opinion, this is caused by the differences in the mode of life, motility of fins, as well as by stabilisation of body during swimming.

Abstract

Acipenseriformes occupy an important place in the evolutionary history. Skeleton of their pectoral fins has elements related to teleosts, but also to tetrapods. This article summarises and compares anatomical structure of the pectoral girdle and pectoral fin of Russian sturgeon (Acipenser gueldenstaedtii) and American paddlefish (Polyodon spathula). These species possess pectoral fins with some distinctive features in their structure. The pectoral girdles are composed of both cartilaginous and ossified elements. Unlike sturgeons, American paddlefish does not have an interclavicle and suprascapular cartilage. Moreover, its cleithrum doesn’t form medially directed lamina. The quantity of the proximal radials in the investigated fish species are not the same. The dorsal and ventral muscles, which act on the pectoral fin of Russian sturgeon and American paddlefish, are not equally developed. In our opinion, this is caused by the differences in the mode of life, motility of fins, as well as by stabilisation of body during swimming.

Get Citation

Keywords

acipenseriformes, evolution, fish, morphology, skeleton

About this article
Title

Comparative anatomy of pectoral girdle and pectoral fin in Russian sturgeon and American paddlefish

Journal

Folia Morphologica

Issue

Vol 75, No 2 (2016)

Pages

173-178

Published online

2015-10-09

DOI

10.5603/FM.a2015.0093

Pubmed

26503180

Bibliographic record

Folia Morphol 2016;75(2):173-178.

Keywords

acipenseriformes
evolution
fish
morphology
skeleton

Authors

K. Grom
E. Pasicka
K. Tarnawski

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