Download e-book for iPad: Sturgeon Biodiversity and Conservation by Eugene K. Balon, Paul Vecsei (auth.), Vadim J. Birstein,

By Eugene K. Balon, Paul Vecsei (auth.), Vadim J. Birstein, John R. Waldman, William E. Bemis (eds.)

ISBN-10: 0306468549

ISBN-13: 9780306468544

ISBN-10: 0792345177

ISBN-13: 9780792345176

`This is a landmark quantity. ... do have your library order the amount in the event that they haven't performed so.'
COPEIA, four (1999)

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Sample text

Acipenseriformes differ from all of the outgroups we considered except †Birgeria, which has reduced scalation that Nielsen (1949) regarded as very similar to that of Polyodon. Discussion of clade †Birgeria + Acipenseriformes Like Berg (1948b) and Yakovlev (1977) and in contrast to Aldinger (1937) and Nielsen (1949), our analysis does not support a sister group relationship between †Birgeria and paddlefishes. However, †Birgeria shares at least three features with Acipenseriformes. These three characters warrant additional specimen based study in †Birgeria and other outgroups not considered here.

Gardiner & Schaeffer (1989) regarded a large, blade shaped hyomandibula as a synapomorphy of Acipenserifornies. This may be true, but is difficult to define in an unambiguous way. It is difficult to decide, Tor example, whether the hyomandibula of †Mimia (which is integrated into a more typical actinopterygian suspensorium) is ‘blade shaped’. Also, in all recent Acipenseriformes, the interhyal is hypertrophied. Interhyal hypertrophy was regarded by Gardiner & Schaeffer (1 989) and Grande & Bemis (1991, character 3) as a synapomorphy of Acipenseriformes.

Could be reliably scored in at least 16 of the 18 taxa listed in Table 7, but most soft-tissue and cartilaginous characters cannot be scored in the fossil taxa (see Grande & Bemis 1997 for additional explanations of this approach). Incorporated into this diagram are published interpretations of relationships for the genera of Polyodontidae (from Grande & Bemis 1991) and Acipenseridae (from Findeis 1993. 1997). Consult those references for characters within the two families. The starting points for our analysis are Patterson (1982), Gardiner & Schaeffer (1989), Grande & Bemis (1991), Rieppel (1992) and Findeis (1997).

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Sturgeon Biodiversity and Conservation by Eugene K. Balon, Paul Vecsei (auth.), Vadim J. Birstein, John R. Waldman, William E. Bemis (eds.)

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