. Bulletin. Science; Natural history; Natural history. 7976 ISOLATING MECHANISMS IN GOODEID FISH 85 of these features among cyprinodontiform fishes, Carl Hubbs, working with Turner, used goodeid trophotaeniae and ovarian anatomy in an exhaus- tive family classification (Hubbs and Turner, 1939). Although a number of taxonomic papers including goodeids (deBuen, 1941, 1942; Turner, 1946; Alvarez and Navarro, 1957: Alvarez, 1959, 1963; Alvarez and Cortes, 1962; and Romero, 1967) have appeared since the Hubbs and Turner revision, only one (Miller and Fitzsimons, 1971) significantly altered their cl
. Bulletin. Science; Natural history; Natural history. 7976 ISOLATING MECHANISMS IN GOODEID FISH 85 of these features among cyprinodontiform fishes, Carl Hubbs, working with Turner, used goodeid trophotaeniae and ovarian anatomy in an exhaus- tive family classification (Hubbs and Turner, 1939). Although a number of taxonomic papers including goodeids (deBuen, 1941, 1942; Turner, 1946; Alvarez and Navarro, 1957: Alvarez, 1959, 1963; Alvarez and Cortes, 1962; and Romero, 1967) have appeared since the Hubbs and Turner revision, only one (Miller and Fitzsimons, 1971) significantly altered their classificatory scheme. Greatly influenced by Guillermo Mendoza's study (1965) with Xenoioca eiseni, Robert Miller and I judged trophotaenial and ovarian anatomy of goodeids likely too variable within a species to justify broader use in a family classification. Through synonymies, we reduced the Hubbs- Turner classification by four genera and one species but in the same report managed to erect a new genus and species of uncertain phylogenetic affinity. During a revision of the goodeid genera Characodon and Xenotoca (Fitzsimons, 1972), I learned that goodeids exhibit elaborate pair- forming rituals during courtship. Ethological data confirmed taxonomic interpretations of morphological information and, in many instances, were better indices to relationships because atten- tion was drawn to features that the animals them- selves used in distinguishing species. Although the study revealed certain elements of courtship to be generically and specificaUy invariable, intra- specific differences in two species of Xenoioca were unmistakable. This report examines these differences. The genus Xenotoca includes X. variata (Bean), X. eiseni (Rutter), and X. melanosoma Fitz- simons (Fig. 1). Xenotoca variata, the type species of the genus and perhaps the most widely distrib- uted goodeid, occurs in a variety of lentic and lotic habitats associated with the drainage basins of the Rios Verde and A
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