Cypriniform Diversity
Outreach and Educaction

Current Projects

Project: Phylogenetic Relationships of Dionda and Relatives in North America

Data needed: Cyt.-b, S7, Rag1, Control region, ND4-ND5, RH

Taxa needed: Dionda rasconis

Current collaborators: R. L. Mayden, Saint Louis University, St. Louis, Missouri, USA; D. M. Hillis, The University of Texas, Austin, Texas USA; J. R. Gold, Texas A&M University, College Station, Texas USA; S. Schonhuth, Saint Louis University, St. Louis, Missouri, USA

Contact Person: Richard L. Mayden (

General Description: The genus Dionda consists of at least 15 species and several undescribed species that are distributed throughout central and west Texas, parts of New Mexico and northern Mexico.  Previously, species in this genus were examined by Mayden, Matson and Hillis using allozyme electrophoresis to examine phylogenetic relationships among species, biogeography, and reveal cryptic diversity.  In this study several undescribed species were identified throughout the ranges of D. ipni and D. episcopa. 

In the present study we are reexamining the same species and specimens using the six identified nuclear and mitochondrial genes.  Collaborators are welcome to join us in this project through efforts to sequence any of the identified genes or providing materials of the needed species.

If you are interested in joining this project please contact the identified person and outline your intended contributions so that we may make rapid progress on resolving the phylogeny and examine the comparative evolution and biogeography of these fishes.
Questions or comments? Contact Director, Dr. Richard Mayden

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