Diversity of Mollusca (Gastropoda) along Intertidal Rocky Shores of Thiruvananthapuram District, Kerala Coast
Keywords:Biodiversity, Mollusca, Gastropoda, Intertidal rocky, species
An assessment of intertidal rocky shore biodiversity of gastropods along Mulloor, Kovalam and Vizhinjam sites of Thiruvananthapuram district Kerala coast is done during three different seasons during 2020- 2022, and identified 108 species across 6 subclasses, 9 orders, 20 super families, 27 families and 61 genera. Neogastropoda was the most species- rich order (50 species) followed by orders Littoriimorpha (30 species), Trochida (7 species), Cycloneritida (7 species), Lepettellida (5 species), Patellogastropoa (2 species), Cephalaspidea (2 species) and Seguenziida (1 species). Family Muricidae was having maximum species diversity (18 species) followed by family Conidae (17 species). Among the 108 species observed in the study, 50 were commonly occurring, whereas 22 were uncommon and 36 were rare. Littorara undulata was the most abundant species observed during the study. A site - wise comparison of the three study sites revealed that Vizhinjam (84 species) was having maximum species diversity followed by Mulloor (82 species) and Kovalam (61 species). An assessment of diversity indices such as Shannon-Wiener index (H) Simpson Dominance Index (D), Evenness index (E) gave significant values indicating very high diversity of gastropods along the study sites. The present study provides information on the gastropod resources of the selected study area, which forms the baseline data for future ecological studies.