Taxonomy of the Neotropical Thorny Catfishes (Siluriformes: Doradidae) and Revision of Genus Leptodoras
Sabaj, Mark Henry
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https://hdl.handle.net/2142/87841
Description
Title
Taxonomy of the Neotropical Thorny Catfishes (Siluriformes: Doradidae) and Revision of Genus Leptodoras
Author(s)
Sabaj, Mark Henry
Issue Date
2002
Doctoral Committee Chair(s)
Page, Lawrence M.
Department of Study
Animal Biology
Discipline
Animal Biology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Genetics
Language
eng
Abstract
Cladistic analysis of relationships among Leptodoras and related taxa (Anduzedoras, Doras, Hassar, Hemidoras) using morphological data recovers Leptodoras praelongus (Myers & Weitzman) as the most ancestral species. The most derived clade is composed of two nominal species, Leptodoras juruensis Boulenger and Leptodoras myersi Bohlke, and one undescribed species, Leptodoras sp. 3. A sister-group relationship between Leptodoras and the monotypic Anduzedoras oxyrhynchus (Valenciennes) is supported by four unambiguous synapomorphies: predorsal distance ≤41% of standard length, first vertebra conspicuously expanded, maxillary edentulous, and average sum of midlateral scutes ≥70. This relationship and those among species of Leptodoras suggest a gradual evolution from a midwater or hyperbenthic form to a truly benthic, relatively deepwater form.
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