Osteology of vertebral column and caudal skeleton of nemacheilid loaches, genus Paraschistura from Iran (Teleostei: Nemacheilidae)

Document Type : Original Article

Authors

1 Department of Biology, Faculty of Sciences, Lorestan University, Khorramabad, Iran

2 Department of Biology, College of Sciences, Shiraz University, Shiraz, Iran

Abstract

These small loaches are distributed from the upper Tigris River basin to Pakistan. Currently a total of 16 species are recognized in Iran. Since osteology has proven to be a useful tool for studying the taxonomy and phylogeny of fishes, including loaches, we have studied some osteological characters are studied in 13 species from Iran. To conduct this study, the fishes were fixed in 10% formaldehyde, stored in 70% and then deposited in the Zoological Museum, Collection of Biology Department, Shiraz University. Digital X-ray radiographs were taken from the left side of all fish using a Faxitron Bioptics. Based on the obtained results caudal skeleton consists of five or six hypurals and unpaired epural, parahypural and pleurstyle bones. The pleurstyle is fused to the last centrum. The shape of the epural is varies in each species. The fifth hypural is triangular, not connected to the terminal centrum and different in size. The results revealed that some Paraschistura species can be distinguished based on the caudal complex, especially by the number of hypurals, dorsal- and caudal-fin rays and the number of vertebra. Therefore, it seems that specific characters, are more useful in distinguishing higher taxa such as lineages, genera and families rather than individual species.

Keywords

References

Berg L.S. 1940. Classification of fishes, both recent and fossil. Travaux de l'lnstitut Zoologique de I'Acade'mie des Sciences de I'URSS 5(3), 87-345.
Day J.J. 2002. Phylogenetic relationships of the Sparidae (Teleostei: Percoidei) and implications for convergent trophic evolution. Biological Journal of the Linnaean Society 6, 269-301.
Eagderi S., Mousavi-Sabet H., Freyhof J. 2019. Paraschistura makranensis, a new loach from the Jegin River drainage in southern Iran with comments on P. ilamensis and P. pasatigris (Teleostei: Nemacheilidae). Zootaxa 4668(2), 258-270.
Freyhof J., Sayyadzadeh G., Esmaeili H.R., Geiger, M. 2015. Review of the genus Paraschistura from Iran with description of six new species (Teleostei: Nemacheilidae). Ichthyological Exploration of Freshwaters 26(2): 1-48.
Helfman G.S., Collette B.B., Facey D.E., Bowen B.W. 2009. The diversity of fishes: Biology, Evolution, and Ecology. Blackwell Publishing, UK, Oxford.
Hora S.L. 1932. Classification, bionomics and evolution of homalopterid fishes. Memorial Indian Museum 12, 263-330.
Jalili P., Eagderi S., Mousavi-Sabet H. 2015. Descriptive osteology of a spined loach, Cobitis avicennae from Iranian part of the Tigris basin. Iranian Journal of Ichthyology 2(1), 53-60.
Jawad L.A., Jig L. 2016. Comparative osteology of the axial skeleton of the genus Pampus (Family: Stromateidae, Perciformes). Journal of the Marine Biological Association of the United Kingdom 97, 277-287.
Mester-Bacescu L. 1970. The morphological comparative study of the shoulder girdle of the fishes belonging to the Cobitidae family from Rumania. Travaux du Museum National d'Histoire Naturelle "Grigore Antipa” 10, 251-272.
Prokofiev A.M. 2009. Problems of the classification and phylogeny of Nemacheiline loaches of the group lacking the preethmoid I (Cypriniformes: Balitoridae: Nemacheilinae). Journal of Ichthyology 49(10), 874-898.
Prokofiev A.M. 2010. Morphological classification of loaches (Nemacheilinae). Journal of Ichthyology 50(10), 827-913.
Sanger T.J., Mccune, A.R. 2002. Comparative osteology of the Danio (Cyprinidae: Ostariophysi) axial skeleton with comments on Danio relationships based on molecules and morphology. Zoological Journal of the Linnean Society 135, 529-546.
Sawada Y. 1982. Phylogeny and zoogeography of the superfamily Cobitoidea (Cyprinoidei, Cypriniformes). Memoirs of the Faculty of Fisheries of Hokkaido University 28(2), 65-223.
Sayyadzadeh G., Teimori A., Esmaeili H.R. 2019a. Paraschistura kermanensis, a new stone loach species from southeastern Iran (Teleostei: Nemacheilidae). Zootaxa 4638(4), 571-583.
 Sayyadzadeh G., Esmaeili H.R., Abbasi, K. 2019b. Comparative Taxonomically Important Osteological Characters of Loach Fishes from Iran (Cypriniformes: Cobitoidea). Iranian Journal of Science and Technology, Transactions A: Science 43, 2149-2162.
Taylor W.R., Van Dyke G.C. 1985. Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage study. Cybium 9, 107-119.
Aquaculture Sciences
Volume 11, Issue 2
October 2023
Pages 96-102

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