An Updated Survey and Biodiversity Assessment of the Terrestrial Snail (Mollusca: Gastropoda) Species in Marinduque, Philippines
Benjamin O. Sosa III1, Gizelle A. Batomalaque1 and Ian Kendrich C. Fontanilla1,2
1* Department of Agriculture – Bureau of Agricultural Research,
RDMIC Bldg., cor Visayas Ave., Diliman, Quezon City, Philippines
2Animal and Dairy Sciences Cluster (Dairy Training and Research Institute),
College of Agriculture, University of the Philippines Los Baños (UPLB),
College, Laguna 4031, Philippines
Marinduque is an island province of volcanic origin and is found in the southern portion of the Luzon Group of Islands. The island has an uneven topography but has experienced drastic deforestation in recent times. Records on the terrestrial snail species diversity in the Philippines in general and Marinduque in particular are sparse in the zoological literature. Previous literature noted only 13 species in Marinduque, which could be a gross underestimation of the terrestrial malacofaunal diversity of the island because the area was not systematically surveyed. This study aimed to assess the malacofaunal biodiversity of Marinduque and prepare a comprehensive list of snail taxa via opportunistic sampling. Sampling was conducted in 12 pre-determined areas of the island, with emphasis on minimally disturbed areas. This study reported ten (10) new records of stylommatophoran species and six (6) new records of terrestrial prosobranch species in Marinduque, which brings a total of 24 terrestrial snail species known to date (or 26 if two previously recorded species that were not encountered in this study are included).
The Philippine islands serve as haven for a large number of invertebrate species, including pulmonate stylommatophoran snails, with 88 described species, and terrestrial prosobranch snails, with 14 described species (Springsteen & Leobrera 1986). It is highly likely that these numbers could be gross underestimates of the actual malacofaunal diversity in the Philippines as many more could be undescribed or cryptic species may abound . . . . . . . . .
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