C. Tan & Peter K. L. Ng
Laboratory; Systematics & Ecology Laboratory
& Ecology Laboratory
Cave shrimps of the Philippines)
Friday, 2nd March 2001
1pm - 2pm
Biological Sciences Conference Room,
Block S3, Level 5, Science Drive 4, Faculty of Science,
The National University of Singapore
NUS-USC Expedition to Cebu, Bohol, in central
natural history of Bohol and Cebu, well known for the
endemic Philippine tarsiers, is both interesting and
intriquing. Having emerged from the sea during the mid
Tertiary, both islands are oceanic in origin and made up of
extensive karst formation which support many unusual and
bizarre stream and cave invertebrates. Near Bohol Island are
deep sea trenches that have not been surveyed for the
crustacean fauna and fishes. A joint expedition was
organized between the Biology Department of University of
San Carlos and the RMBR of DBS-NUS to survey, albeit
preliminarily, the fresh water stream, cave and deep sea
fauna of central Philippine Sea from Dec 11-20, 2000.
Several new species of fresh water and cave crabs were
collected. Discussion of the evolution and biogeography of
the two islands' fauna will be made in the light of new
findings that emerged from this expedition. Additional notes
on the local conservation program and public education will
also be presented.
shrimps of the Philippines"
- The diversity of cavernicolous shrimps of the Philippines
is reappraised on the basis of recent as well as old
collections. This study shows that the subterranean shrimp
fauna of the Philippines is represented only by the family
Atyidae, with 11 species in 5 genera--Antecaridina,
Jolivetya, Edoneus, Halocaridinides, and Caridina, belonging
to three subfamilies--Typhlatyinae, Caridellinae and
Atyinae. Nine stygobiont species and 2 stygoxene species are
recorded. Of these, five are new to science and four are
recorded from the Philippines for the first time. Results of
morphological comparisons suggest that the subterranean
shrimps of the Philippines might have multiple origins.
Three hypothetical origin pathways are proposed.
Morphological illustrations are provided. The adaptations of
these shrimps to these subterranean habitats and their
possible speciation are discussed.