| eusthenura species group |
Members of the eusthenura subgroup are distinguished from others as follows: metasomal segment V distinctly longer than either carapace or movable finger; pedipalp fingers elongate, movable and fixed finger each distinctly longer than underhand; pedipalp palm narrow, with keels low to obsolete; dorsal and dorsolateral keels of metasoma well developed and coarsely crenulate to serrate; ventrolateral keels of metasoma present, these smooth, crenulate or intermediate; ratio of chela length to palm width 3.3 to 6.2; ratio of fixed-finger length to length of palm 0.7 to 1 .4; ratio of movable-finger length to palm width 2.0 to 4.4; pedipalp with 6 supernumerary granules on fixed, 7 on movable finger.
Notes: Williams (1980) included the following Baja California species in the eusthenura group: V. confusus, V. waeringi, V. galbus, V. diazi, V. eusthenura, V. hoffmanni, V. gravicaudus, V. spinigerus, V. puritanus, V. vittatus, V. viscainensis, and V. pattersoni. Sissom Web Catalog: The eusthenura group was formally diagnosed by Williams (1970g), although he had made earlier references to it. Initially (e.g. Williams, 1968a), he suggested separate “spinigerus” and “eusthenura” groups, but later considered them to represent only a single group. Members of this group are found throughout western North America, including southwestern USA, Baja Calfornia, and most of mainland México. Key to the species in Baja Calfornia was provided by Williams (1980), and that key will also be helpful for adjacent areas of southwestern USA. The only key that treats species in mainland México is that of Hoffmann (1931); as readily guessed, it is outdated, and the species there are in need of reevaluation.
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