Otophysi
Otophysi | ||||||||||||
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Bream ( Abramis brama ) with spawning rash |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Otophysi | ||||||||||||
Rosen & Greenwood , 1970 |
The Otophysi ( Otophysa as a section according to Wiley and Johnson 2010) are a taxon of the Teleostei (bony fish in the sense ). With the exception of the sandfish-like (Gonorynchiformes), they include all orders of the Ostariophysi , i.e. carp-like (Cypriniformes), tetras (Characiformes), catfish-like (Siluriformes) and New World knife fish (Gymnotiformes). The Otophysi include almost 6500 fish species, that is about 27% of the Teleostei species and 64% of all freshwater fish .
features
All Otophysi have Weber's apparatus . According to Fink & Fink (1996) they are defined by eight skeletal synapomorphies :
- The cartilaginous part of the metapterygoid ( wing bone of the fish) is double-headed in the basal orders Cypriniformes and Characiformes, in the Siluriformes it ends in a single end.
- The first supraneuralia (parts of the vertebrae), in the tetras and catfish, or, in the carp-like species, the first two supraneuralia are widened downwards and connected to the neural arches of the third and fourth vertebrae.
- Parts of the neural arch of the first vertebra are converted to the scaphium and caustrum.
- The neural arch of the second vertebra is converted to the intercalarium.
- The first four vertebral centers show some shortening compared to vertebral centers further back.
- The foremost parapophyses, processes on the underside of vertebrae, are, if present, fused with the central vertebral body (could also be a synapomorphism of the ostariophysi).
- The tripus, a special ossicle of Weber's apparatus , was formed from the rib and parapophysis of the third vertebra.
- The shortened ribs of the fourth vertebra, called the suspensorium, enclose the front section of the swim bladder on both sides .
Systematics
The following cladogram shows the systematic position of the otophysa:
Otomorpha |
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literature
- Joseph S. Nelson : Fishes of the World . John Wiley & Sons, 2006, ISBN 0-471-25031-7 .
- Wilfried Westheide , Reinhard Rieger: Special Zoology. Part 2: Vertebrae and Skull Animals. 1st edition, Spektrum Akademischer Verlag, Heidelberg • Berlin 2004, ISBN 3-8274-0307-3 .
- EO Wiley & G. David Johnson: A teleost classification based on monophyletic groups. Page 134 in Joseph S. Nelson, Hans-Peter Schultze & Mark VH Wilson: Origin and Phylogenetic Interrelationships of Teleosts. 2010, Verlag Dr. Friedrich Pfeil, Munich, ISBN 978-3-89937-107-9 .