More on Mexican snails

Edna Naranjo-García published (quite) recently two other papers on terrestrial land snails from Mexico. Not having seen the papers so far, I can only make you aware of their existence and copy the abstracts.

The first paper by Araiza & Naranjo-García (2013) is about the state of Veracruz. “Previous studies about the gastropod diversity of Atoyac, demonstrated the presence of 37 terrestrial gastropods species. However, due to the disappearance of the natural landscape due to the increase in recent years of coffee and cane crops in the municipality and the lack in  Mexico of specimens reported in those studies, it is interesting to  document the actual diversity of the municipality, using collecting  techniques directed to the study of the terrestrial malacofauna, so 21  localities were visited in Atoyac, Veracruz in 2007 and 2008. Fifty seven species, 21 subspecies and 19 families of terrestrial gastropods were found. The families with the largest number of species are Spiraxidae (with 17 species), Subulinidae (11), Euconulidae (8), Helicinidae (7) and Orthalicidae (6). The species with the widest distributions are: Hawaiia minuscula minuscula, Helicina (Tristamia) zephyrina zephyrina, Schasicheila (Atoyac) alata and Leptopeas micra.
The malacofauna known in Atoyac increases in 21 species, 10 subspecies and 7 families; 5 species Pyrgodomus simpsoni, Pupisoma dioscoricola, Salasiella camerata, Pseudosubulina minuta and Punctum minutissimum are registered for the first time for Veracruz and 7 are possible new species.”

The second paper is by Naranjo-García on the biodiversity of terrestrial snails. “The land Mollusca are exclusively from the class Gastropoda. They are diverse in shapes, sizes (1 to 200-300 mm), habits, environments (by  climate and vegetation), life cycles and life spans. Prosobranchia has the least number of species, Pulmonata is the richest. They are either preys or predators. Towards the end of the 19th century and beginning of the 20th century comprehensive works compiled the known diversity. We recognize 8 families in Prosobranchia, and 39 in Pulmonata, with 5 families: Cerionidae, Eucalodiidae, Holospiridae, Epirobiidae, Echinichidae, recently added. Endemism among the lesser families attains 62%; the 1184 known Mexican terrestrial species represent 3.4% of the global molluscan diversity; 2 200 additional species are estimated yet  to be found. The population patterns of the families Holospiridae and  Epirobiidae are well established since they are defined by the presence of calcite and/or dolomite in the soil. Land American mollusks are solitary; however, some develop abundant populations (Xerarionta, Praticolella, Humboldtiana). Lysinoe ghiesbreghti is utilized locally for food consumption. Nine families are the most diverse: Spiraxidae, Orthalicidae, Holospiridae, Helicinidae, Eucalodiidae, Helminthoglyptidae, Vertiginidae, Polygyridae and Humboldtianidae.
Richness per state is unequal; Veracruz is the best known, whereas  Aguascalientes and Tlaxcala possess no records. Between the years 1891-1895 and 1926-1930, a great number of species were described. Studies on life cycles, behavior and ecology are still needed in the group.”

References:
Araiza, V. & Naranjo-García, E. (2013). Systematic checklist of the terrestrial malacofauna from Atoyac, Veracruz. — Revista Mexicana de Biodiversidad 84: 765–773.
Naranjo-García, E. (2014). Biodiversity of terrestrial molluks in Mexico. — Revista Mexicana de Biodiversidad 85: S431–S440.

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