. The biogeography of the herpetofauna of the subhumid forests of Middle America : (Isthmus of Tehuantepec to northwestern Costa Rica). Herpetology; Reptiles, Fossil. three groups: a western subhumid lowland assemblage, an eastern mesic lowland assemblage, and a central upland assemblage (see discussion in Major Geohistorical Events). The species in this group are as follows (closest relatives in either the eastern lowland or upland assem- blages are indicated parenthetically): Oedipina stuarti (uniformis subgroup of O. uniformis group) Oedipina taylori {uniformis subgroup of O. uniformis grou
. The biogeography of the herpetofauna of the subhumid forests of Middle America : (Isthmus of Tehuantepec to northwestern Costa Rica). Herpetology; Reptiles, Fossil. three groups: a western subhumid lowland assemblage, an eastern mesic lowland assemblage, and a central upland assemblage (see discussion in Major Geohistorical Events). The species in this group are as follows (closest relatives in either the eastern lowland or upland assem- blages are indicated parenthetically): Oedipina stuarti (uniformis subgroup of O. uniformis group) Oedipina taylori {uniformis subgroup of O. uniformis group) Bufo canaliferus (B. valliceps) Bufo luetkeni (B. valliceps) Staurotypus salvini (5. triporcatus) Coleonyx elegans (C mitratus) Lepidophyma smithi (L. flavimaculatum) Norops cupreus (N. dollfusianus) Sibon carri {S. fisheri) Tantilla striata (J. jani and T. taeniata) All of the species in this track are in our endemic catego- ry, except for C. elegans and L. smithi. Grismer (1988) postulated an early Pliocene origin south of the Tehuantepec Portal for the C. elegans-mitratus ancestor. Such a scenario would allow for the in situ development of C. elegans in the evolving Pacific lowlands with subse- quent Quaternary dispersal across the Isthmus of Tehuantepec to the Yucatan Peninsula and up the east coast of Mexico. 4. EASTERN MIDDLE AMERICAN GENERALIZED TRACK (9 species; Table 10; Fig. 6) The species in this track are postulated to have evolved in situ from a mesic-adapted ancestor widely distributed in Middle America from the base of the Yucatan Peninsula southward. Six species are in the Middle American and three are in the Old Northern historical units. The species in this track are as follows (closest relatives are indicated parenthetically): Bolitoglossa yucatana (B. dofleini) Eleutherodactylus yucatanensis (E. alfredi) Kinosternon creaseri (K. acutum) Laemanctus serratus (L. longipes) Coniophanes meridianus (C. imperialis) Dipsas brevifacies (D. bicolor) Imantodes tenui
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Keywords: ., bookcentury1900, booksubjectherpetolo, booksubjectreptilesfossil
