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The molecular systematics of the sup...

Obermiller, Lewis Edward.

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The molecular systematics of the superorder Elopomorpha and order Anguilliformes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The molecular systematics of the superorder Elopomorpha and order Anguilliformes./
Author:	Obermiller, Lewis Edward.
Description:	141 p.
Notes:	Source: Dissertation Abstracts International, Volume: 62-06, Section: B, page: 2611.
Contained By:	Dissertation Abstracts International62-06B.
Subject:	Biology, Molecular. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3016032
ISBN:	9780493269160

The molecular systematics of the superorder Elopomorpha and order Anguilliformes.
Obermiller, Lewis Edward.

The molecular systematics of the superorder Elopomorpha and order Anguilliformes. - 141 p.

Source: Dissertation Abstracts International, Volume: 62-06, Section: B, page: 2611.

Thesis (Ph.D.)--Arizona State University, 2001.

The superorder Elopomorpha, a grouping which includes all teleost fishes that possess a specialized leptocephalus larva (true eels, bonefishes, tarpons, and their relatives), constitutes over 800 species for which there is no definitive classification scheme. This is mainly due to a lack of valid apomorphic morphological characters within these assemblages that are essential in developing a true phylogeny. This study utilizes a molecular systematics approach, based on the mitochondrial ribosomal (12S and 16S) DNA sequences of 45 independent taxa encompassing all of the previously proposed orders of Elopomorpha, 9 of the 15 currently recognized families of Anguilliformes (true eels), as well as outgroup representatives from the superorders Osteoglossomorpha and Clupeomorpha, in order to address the relationships among the ordinal members of the superorder Elopomorpha and familial members of the order Anguilliformes. Maximum parsimony and Neighbor-Joining trees were generated employing the Branch and Bound and Jukes-Cantor distance methods of PAUP 4.0b, respectively. Trees generated through this study suggest that the superorder Elopomorpha, as currently recognized, is not a valid monophyletic assemblage. Such a finding conflicts with the majority of morphological evidence presented to date, suggesting that several ordinal and perhaps superordinal revisions among the Elopomorpha may be warranted. Conversely, the order Anguilliformes does appear to be a valid monophyletic assemblage in line with previous assumptions. Moreover, the molecular data define a basal split between members of the order Anguilliformes that corresponds to the presence of fused versus divided frontal bones. This characteristic is an important morphological character used to separate the more primitive anguilliforms (divided frontals) from the more advanced forms (fused frontals). However, several of the previously proposed familial groupings into superfamilies and suborders are not supported by the molecular data, suggesting that these may need to be revised. In summary, the present study has demonstrated the utility of employing molecular techniques to provide new insights into the phylogenetic relationships and evolution of a particularly problematic group of primitive fishes.

ISBN: 9780493269160Subjects--Topical Terms:

1017719
Biology, Molecular.

The molecular systematics of the superorder Elopomorpha and order Anguilliformes.
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100 1 $a Obermiller, Lewis Edward. $3 1914732
245 1 4 $a The molecular systematics of the superorder Elopomorpha and order Anguilliformes.
300 $a 141 p.
500 $a Source: Dissertation Abstracts International, Volume: 62-06, Section: B, page: 2611.
500 $a Adviser: Edward Pfeiler.
502 $a Thesis (Ph.D.)--Arizona State University, 2001.
520 $a The superorder Elopomorpha, a grouping which includes all teleost fishes that possess a specialized leptocephalus larva (true eels, bonefishes, tarpons, and their relatives), constitutes over 800 species for which there is no definitive classification scheme. This is mainly due to a lack of valid apomorphic morphological characters within these assemblages that are essential in developing a true phylogeny. This study utilizes a molecular systematics approach, based on the mitochondrial ribosomal (12S and 16S) DNA sequences of 45 independent taxa encompassing all of the previously proposed orders of Elopomorpha, 9 of the 15 currently recognized families of Anguilliformes (true eels), as well as outgroup representatives from the superorders Osteoglossomorpha and Clupeomorpha, in order to address the relationships among the ordinal members of the superorder Elopomorpha and familial members of the order Anguilliformes. Maximum parsimony and Neighbor-Joining trees were generated employing the Branch and Bound and Jukes-Cantor distance methods of PAUP 4.0b, respectively. Trees generated through this study suggest that the superorder Elopomorpha, as currently recognized, is not a valid monophyletic assemblage. Such a finding conflicts with the majority of morphological evidence presented to date, suggesting that several ordinal and perhaps superordinal revisions among the Elopomorpha may be warranted. Conversely, the order Anguilliformes does appear to be a valid monophyletic assemblage in line with previous assumptions. Moreover, the molecular data define a basal split between members of the order Anguilliformes that corresponds to the presence of fused versus divided frontal bones. This characteristic is an important morphological character used to separate the more primitive anguilliforms (divided frontals) from the more advanced forms (fused frontals). However, several of the previously proposed familial groupings into superfamilies and suborders are not supported by the molecular data, suggesting that these may need to be revised. In summary, the present study has demonstrated the utility of employing molecular techniques to provide new insights into the phylogenetic relationships and evolution of a particularly problematic group of primitive fishes.
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