Theses and Dissertations

Title: A chromosome study from cultured cells of six catostomid fishes

Name: Naftel, John Philip

Degree: MS

Chair: Dr. John S. Ramsey

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1972

Pages: 60

Keywords: Chromosome Study,Catostomid Fishes.


Cell culture preparations were used to study the chromosome complements of six catostomid species from the Alabama River drainage. The species could be divided into two distinct karyological groups: Specimens of Cycleptus elongatus, Carpiodes velifer, and Hypentelium etowanum had diploid chromosome numbers of 100, including four to six medium-size metacentrics. Specimens of Moxostoma carinatum, Moxostoma poecilurum, and Minytrema melanops had 98 chromosomes, including six medium-size metacentrics and a pair of conspicuously large two-armed chromosomes. A pair of distinctive satellited chromosomes was observed in all species except C. elongatus. Size of the satellited pair varied among species. Karyotype variation among the six species corresponds to existing taxonomic groups within the family, and the results of this survey indicate that the karyotype will be a valuable character in catostomid systematics. All of the 98-chromosome species belong to the advanced subfamily Catostominae, and two of the 100-chromosome species (Cycleptus elongatus and Carpiodes velifer) belong to the two more conservative subfamilies (Cycleptinae and Ictiobinae, respectively). It is hypothesized that the reduced chromosome number and the large two-armed chromosome pair in the Catostominae are the result of centric fusion in the early history of the subfamily. The mode of origin of the Hypentelium (Catostominae) karyotype is perplexing, and a more comprehensive study is necessary to establish the position of this genus in catostomine phylogeny.

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