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"Paradox lost" : skeletal ontogeny of Indostomus paradoxus and its significance for the phylogenetic relationships of Indostomidae (Teleostei, Gasterosteiformes). American Museum novitates ; no. 3383

Show simple item record Britz, Ralf. en_US Johnson, G. David. en_US 2005-10-06T16:41:17Z 2005-10-06T16:41:17Z 2002 en_US
dc.description 43 p. : ill. (some col.) ; 26 cm. en_US
dc.description Includes bibliographical references (p. 36-37). en_US
dc.description.abstract "On the basis of an ontogenetic series of Indostomus paradoxus, we test characters that have been proposed for the phylogenetic placement of this enigmatic taxon. Contrary to previous authors, we found that the body armor of Indostomus differs from that of syngnathoids greatly and it closely resembles that of gasterosteoids in many unique details. The body plates originate from two different sources, that is, the endoskeleton (proximal-middle radials of dorsal and anal fin, neural and hemal spines, pelvic cartilages) and the exoskeleton (postcleithra, lateral body plates, sternal plate). The median bone in the ethmoid region develops from two centers and most likely represents the nasal bones that fuse during ontogeny with each other and with the vomer. Identity of the opercular bones is clarified, and it is demonstrated that Indostomus has an interopercle. The single pterygoid bone is the ectopterygoid. A parietal is lacking. There is only one cartilaginously preformed hypural element in the caudal fin. There is no parhypural, but a similar structure, termed the pseudoparhypural by us, develops as membranous outgrowths of the single hypural and the ural centrum. The pectoral radial plate fuses to the scapulocoracoid cartilage, and the pectoral radials ossify within that fused plate without prior fragmentation of the plate into individual radials, being specializations of the pectoral girdle that we think to be shared with all gasterosteoids. Indostomus shares with other gasterosteiforms the modification of the tripartite occipital condyle into an articulation of the basioccipital and the first centrum through loss of the articulation between exoccipitals and the first centrum in all developmental stages. Indostomus lacks distal radials in all pterygiophores supporting fin spines at all developmental stages, a character shared with other gasterosteiforms, mastacembelids, and probably other smegmamorphs. We conclude that Indostomus is a gasterosteoid gasterosteiform"--P. 2. en_US
dc.format.extent 2108002 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 3383 en_US
dc.subject.lcc QL1 .A436 no.3383, 2002 en_US
dc.subject.lcsh Indostomus paradoxus en_US
dc.subject.lcsh Indostomus paradoxus -- Development. en_US
dc.subject.lcsh Bones. en_US
dc.subject.lcsh Gasterosteiformes -- Phylogeny. en_US
dc.subject.lcsh Fishes -- Burma, Upper en_US
dc.title "Paradox lost" : skeletal ontogeny of Indostomus paradoxus and its significance for the phylogenetic relationships of Indostomidae (Teleostei, Gasterosteiformes). American Museum novitates ; no. 3383 en_US
dc.title.alternative Skeletal ontogeny of Indostomus en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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