. Annual report - Western Society of Malacologists. Mollusks; Mollusks. %. a 40 ^^ 45 48. 63 Sonora Sinaloa NayarJt Jalisco Colima Mich. QuerreroOaxaca Chiapas ^i=!!!!!;| Families States ^ Genera I I Species Figure 1. Taxa of land snails known from the Pacific States of Mexico. In the eighties W. B. Miller, J. Hoffman, J. Deisler and E. Naranjo-Garcia explored mainly the northern region of Sonora. At the same time Polaco and M. T. Olivera were doing studies in various sites of Mexico. Of the many people who collected snails through al- most two centuries, one can determine that profession
. Annual report - Western Society of Malacologists. Mollusks; Mollusks. %. a 40 ^^ 45 48. 63 Sonora Sinaloa NayarJt Jalisco Colima Mich. QuerreroOaxaca Chiapas ^i=!!!!!;| Families States ^ Genera I I Species Figure 1. Taxa of land snails known from the Pacific States of Mexico. In the eighties W. B. Miller, J. Hoffman, J. Deisler and E. Naranjo-Garcia explored mainly the northern region of Sonora. At the same time Polaco and M. T. Olivera were doing studies in various sites of Mexico. Of the many people who collected snails through al- most two centuries, one can determine that professional malacologists did the most serious collecting during the last four decades. At the present time the compiled list contains 445 species, 66 genera and 26 families. Figure 1 shows the distribution of taxa per state, fami- lies, genera and species. The states with more information are Oaxaca, Sonora, Chiapas and Jalisco. Guerrero, Michoacan, Sinaloa, Nayarit and Colima are the least known states with 48, 45, 31, 25 and 24 species respectively. The second analysis of the information contained in the species list was to calculate the Sorensen Index at the generic level. The following tree (Figure 2) was obtained, showing three main branches, that can be interpreted as faunal dif- ferences. To the left, Sonora appears distinctly separate from the rest of the states. It shares some features with those states, however. In the southern region of Sonora, the more tropical fauna -coming from the south - penetrates - into the state (Naranjo-Garcia, 1991). There is a main group composed by Jalisco, Michoacan, Sinaloa, Nayarit, Colima, Guerrero and Oaxaca. Chiapas clearly segregates from the fauna of the central Pacific region. The central Pacific region is then constituted by Jalisco, Michoacan, Sinaloa, Nayarit, Colima, Guerrero and Oaxaca, with a slightly more homogeneous fauna than that of Sonora or Chiapas. Annual Report, Vol. 26. Please note that these images are extracted from scan
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmollusks
