The word Mollusc is stemmed from the Latin word "Molluscus" which means soft. It is the second-largest phylum of invertebrates; as the very first one is arthropods. The phylum consists of soft-bodied animals. The phylum Mollusca consists of a diverse group of organisms which include slow-moving snails and slug, bivalved clams, and highly Most of the mollusc species that they capture are not subject to any type of surveillance or control, so their extraction, despite their low abundances, remains intense. 3.2. Income from Fishing The fishermen have their economic income as exclusive product of the mollusk they fish, worth $1806.00 Mexican pesos per week. 1.0 INTRODUCTION. Oyster is a mollusc with a soft un-segmented body protected by two permanent hard shells which increase in size as the animal grows. This marine bivalve belongs to the family Ostereidae which comprises three genera, namely: Ostrea, Crassostrea and Pyncnodonta. There are more than 100 known species of oysters, but only several thus, it plays a pivotal role in rural livelihood and constitute as an important socio-economic economic valuation, hotspots, molluscs pdf (accessed on economic importance of arthropods. the whole animal is cooked and eaten decapods & bivalve molluscs known for their economic value a list the economic importance of fish, some molluscs and sea … Echinoderms are economically important to humans due to their use in scientific research and education and also for food. Scientists have learned much about animal reproduction, fertilization and development by studying sea urchins, sea stars and other echinoderms. Scientists have used echinoderms to study fertilization due to the fact that of Snails of Medical Importance. Snails are terrestrial and aquatic invertebrate of the. order gastropoda that can be identified by hamped. shell, mucus secretion and use of its soft shapeless. muscles for locomotion. Classification. Snails (Mollusca) of medical importance belong to three. genera. The maximum amount of oyster meats are collected from two genera— Ostrea and Crassostrea, which Economic Importance of Phylum Molluscs Arthropoda. Arthropoda is the largest phylum with about nine lakh species. They may be aquatic, terrestrial or even parasitic. They have jointed appendages and a chitinous exoskeleton. iv. ABSTRACT . The deep seas include marine waters below 200 m, where sunlight does not penetrate or is so dim that the environment does not allow photosynthesis. 4. Economic Importance of Rats: Rats occur in almost all the terrestrial habitats that support life. They multiply rapidly and soon establish their colony. Rats are omnivorous, feeding on seeds, fruits, grains, roots, insects, snails and invertebrate and vertebrate bodies. They are mainly fossorial, nesting and living much of the time in burrows. Economic Importance of Phylum Molluscs Arthropoda. Arthropoda is the largest phylum with about nine lakh species. They may be aquatic, terrestrial or even parasitic. They have jointed appendages and a chitinous exoskeleton. This phylum includes several large classes and contains the class Insecta which itself represents a major Page 8/14