Thesis
Systematics and evolution of the Glass Knifefishes Eigenmannia (Gymnotiformes: Sternopygidae): Cryptic diversity in a morphologically-conserved group
Waltz, B.T.
Record Number:
5756
Year:
2019
Pages:
302 pages
University:
Dissertation Presented to the Graduate Faculty of the University of Louisiana at Lafayette In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy
Abstract:
This doctoral dissertation focuses on the genetic, geographic, and morphological
bases of speciation in glass knifefishes of the genus Eigenmannia, a species-rich but
morphologically-conserved clade of Neotropical freshwater fishes. The Neotropical
freshwater ichthyofauna is the most diverse on Earth, encompassing >8,000 species or
approximately one-quarter of all living fishes. The freshwater fish genus
Eigenmannia represents an excellent model in which to study the formation of this
immense diversity, exhibiting many features commonly observed in members of the
fauna. Eigenmannia has diversified into at least 21 species, including a
few geographically widespread and many geographically restricted species.
Further, Eigenmannia species exhibit little divergences in features of external
morphology, such that most sister-species pairs do not differ substantially in ecologicallyrelated
aspects of head and jaw morphology, but rather differ primarily on the basis of
social communication signals and karyotypes. Such a cryptic (or in some cases pseudocryptic)
nature of phenotypic differences among closely related species has hampered
efforts to document diversity in this genus, as in the Neotropical fauna as a whole, and
obscured the role of ecological and evolutionary processes in producing this incredible
species richness.
Times Cited:
1
Relevent Species:
Related Records:
Trajano, E. and de Souza, A. M. (1994)
Behaviour of Ancistrus cryptophthalmus an armoured blind catfish from caves of central Brazil, with notes on syntopic Trichomycterus sp. (Siluriformes, Loricariidae, Trichomycteridae)
Triques, ML (1996)Eigenmannia vicentespelaea, a new species of cave dwelling electrogenic neotropical fish (Ostariophysi: Gymnotiformes: Sternopygidae)
Bichuette, M.E. (2001)Populational study and compared behaviour of Eigenmannia species from Goias, Central Brazil (Ostariophysi: Gymnotiformes: Sternopygidae)
Albert, J.S. (2001)Species diversity and phylogenetic systematics of American knifefishes (Gymnotiformes, Teleostei).
Fernandez, L. and Bichuette, M.E. (2002)A new cave dwelling species of Ituglanis from the Sao Domingos karst, central Brazil (Siluriformes: Trichomycteridae)
Bichuette, M.E. and Trajano, E (2003)Epigean and subterranean ichthyofauna from the Sao Domingos karst area, Upper Tocantins River basin, central Brazil
Bichuette, M.E. (2003)Distribuicao, biologia, ecologia populacional e comportamento de peixes subterraneos, generos Ituglanis (Siluriformes: Trichomycteridae) e Eigenmannia (Gymnotiformes: Sternopygidae) da area carstica de Sao Domingos, nordeste de Goias
Reis, R.E., Kullander, S.O. and Ferraris, C.J. (2003)Checklist of the freshwater fishes of South and Central America
Moyses, C.B., Mockford, S., Almeida-Toledo, F. and Wright, J.M. (2005)Nine polymorphic microsatellite loci in the Neotropical electric eel Eigenmannia (Teeleostei: Gymnotiformes)
Bichuette, M.E. and Trajano, E. (2006)Morphology and distribution of the cave knifefish Eigenmannia vicentespelaea Triques, 1996 (Gymnotiformes: Sternopygidae) from central Brazil, with expanded diagnosis and comments on subterranean evolution
Bichuette, M.E. (2008)Eigenmannia vicentespelaea Triques 1996
Bichuette, M.E. and Trajano, E. (2015)Population density and habitat of an endangered cave fish Eigenmannia vicentespelaea Triques, 1996 (Ostariophysi: Gymnotiformes) from a karst area in central Brazil
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