11. SPECIES COMPOSITION AND KEY TO SPECIES OF SUBCLASS PTERIOMORPHIA IN THE MANGROVE FOREST ECOSYSTEM OF XUAN THUY NATIONAL PARK, GIAO THUY DISTRICT, NAM DINH PROVINCE

Tóm tắt

The Pteriomorphia is a subclass of Bivalvia, phylum Mollusca that lives in saltwater. The species in this subclass have a soft body, with a protective and supportive limestone shell. The species belonging to the subclass Pteriomorphia quite varied in morphology and ecological characteristics. Many species with high nutrition are used as valuable foods. Analysis results of the collected samples in the mangrove ecosystem of Xuan Thuy National Park, Nam Dinh province have identified 20 species belonging to 10 genera; (Anadara, Estellacar, Crassostrea, Saccostrea, Anomia, Placuna, Brachidontes, Xenostrobus, Perna, and Isognomon), 7 families (Arcidae, Noetiidae, Ostreidae, Anomiidae, Placunidae, Mytilidae, Isognomonidae) and 5 orders (Arcida, Mytilida, Ostreida, Pectinida and Pteriida). Some food valuable species in the subclass Pteriomorphia in the study area such as: Antique ark, Blood cockle, Half-crenated ark, Nodular ark, Olive ark, Green-shell mussel, Estuarine oyster, Japanese oyster,...that local people exploit and cultivate. The results indicated that the key to 20 species of the subclass Pteriomorphia based on the morphological characteristics of the shell.