Review of spino-occipital and spinal nerves in Tetraodontiformes, with special reference to pectoral and pelvic fin muscle innervation
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The spino-occipital nerve (SO) and ventral rami of the spinal nerves (SV) in 10 tetraodontiform families and 5 outgroup taxa were examined, with special reference to pectoral and pelvic fin muscle innervation. Compared with the outgroup taxa, tetraodontiforms were characteristic in having SO3 + SV1 (SO3 in tetraodontids) that gave off several lateral subbranches to the pectoral fin base and SO participation in infracarinalis anterior innervation. SO and SV1 were connected with one another (6 patterns) before entering the pectoral fin muscles in most species, including the outgroup taxa, resulting in the participation of SV1 in the innervation of almost all of the pectoral fin muscles. SO3 + SV1 was present in all tetraodontiforms (except in 2 tetraodontids having only SO3) and the outgroup taxa, an upper dorsal branch uniformly extending dorsally into the pectoral fin base. The pectoral fin base also received a branch ventrally, but its identity differed (participation or nonparticipation of SV2). SV1 alone constituting the branch was a derived condition occurring in Aracanidae, Ostraciidae, Tetraodontidae, Diodontidae, and Molidae. No strong characters supporting a tetraodontiform sister group were recognized among the spino-occipital nerve and ventral rami of spinal nerves.
Key wordsTetraodontiformes Spino-occipital nerve Spinal nerves Muscle innervation
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- Nelson, JS 2006Fishes of the world4th ednWileyNew YorkGoogle Scholar
- Parenti, LR, Song, J 1996
Phylogenetic significance of the pectoral-pelvic fin association in acanthomorph fishes: a reassessment using comparative neuroanatomyStiassny, MLJParenti, LRJohnson, GD eds. Interrelationships of fishesAcademic PressSan Diego427444Google Scholar
- Rosen, DE 1984Zeiformes as primitive plectognath fishesAm Mus Novit2782145Google Scholar
- Tyler, JC 1980Osteology, phylogeny, and higher classification of the fishes of the order Plectognathi (Tetraodontiformes)NOAA Tech Rep NMFS Circular4341422Google Scholar
- Tyler, JC, O'Toole, B, Winterbottom, R 2003Phylogeny of the genera and families of zeiform fishes, with comments on their relationships with tetraodontiforms and caproidsSmithson Contrib Zool6181110Google Scholar
- Winterbottom, R 1974The familial phylogeny of the Tetraodontiformes (Acanthopterygii: Pisces) as evidenced by their comparative myologySmithson Contrib Zool1551201Google Scholar