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Molluscs are either dioecious, with separate sexes, or hermaphroditic, one individual bearing both male and female sex organs. The eggs of aquatic species of bivalves and some species of gastropods develop into trochophores, which in turn usually develop into veliger larvae.
- Are most mollusks Monoecious or dioecious?
- Are molluscs dioecious?
- Are molluscs hermaphrodites?
- What are characteristics of Mollusca?
- Is Mollusca Oviparous or viviparous?
- Are molluscs viviparous?
- Does a Mollusca have a shell?
- Are molluscs dioecious and Oviparous?
- Is Mollusca a bilateral symmetry?
- Are molluscs hermaphrodites or have separate sexes?
- What type of reproduction is mollusk?
- Do mollusks go through metamorphosis?
- What are the salient features of Mollusca give example?
- Is Mollusca segmented?
Are most mollusks Monoecious or dioecious?
Respiration is facilitated by gills known as ctenidia. A chitinous scraper called the radula is present in most mollusks. Mollusks are mostly dioecious and are divided into seven classes. The phylum Annelida includes worm-like, segmented animals.
Are molluscs dioecious?
The animals in the phylum Mollusca (e.g., clams, snails, and squid) display a diversity of reproductive behaviour. The majority of the amphineurans (chitons) and pelecypods (e.g., clams, oysters) are dioecious—i.e., individuals are either male or female.
Are molluscs hermaphrodites?
The study reveals that about 40% of the 5600 mollusc genera are either simultaneous or sequential hermaphrodites. ... Sequential hermaphroditism, whatever its theoretical advantages over gonochorism, is not common among molluscs. Simultaneous hermaphroditism is common among the Euthyneura.
What are characteristics of Mollusca?
Molluscs (also know as mollusks) are soft-bodied, bilaterally symmetrical, segmented, coelomate animals; usually shelled having a mantle, ventral foot, anterior head, and a dorsal visceral mass.
Is Mollusca Oviparous or viviparous?
Birds, reptiles, amphibians, most fish, insects, mollusks, arachnids, and monotremes are oviparous animals. Most mammals are viviparous animals.
Are molluscs viviparous?
Mollusca : Normally oviparous and development through a trochophore or veliger larva.
Does a Mollusca have a shell?
mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.
Are molluscs dioecious and Oviparous?
Molluscs are usually dioecious, that is, sexes are separate, there are separate males and females. They are oviparous as they lay eggs. Molluscs show indirect development. The life cycle of many molluscs includes a free-swimming larva called trochophore.
Is Mollusca a bilateral symmetry?
Mollusca can be found in freshwater, marine and terrestrial habitats. More features of molluscs include bilateral symmetry, soft or unsegmented bodies, respiration via ctenidium, ganglia/nerve comprised nervous system, haemocoel body cavity, etc.
Are molluscs hermaphrodites or have separate sexes?
In many marine gastropods there are separate sexes (male and female); most terrestrial gastropods however are hermaphrodites. ... Gastropods are defined as snails and slugs, belonging to a larger group called Molluscs. Gastropods have unique reproductive systems, varying significantly from one taxonomic group to another.
What type of reproduction is mollusk?
Mollusks reproduce sexually, and most species have separate sexes. Sexual reproduction is achieved by the formation and fusion of gametes: sperm and eggs. Some species are hermaphrodites meaning that individuals are capable of forming both sperm and eggs.
Do mollusks go through metamorphosis?
Metamorphosis, the transition of free-swimming larvae to benthic and often sessile and attached juveniles, is one of the most distinctive life changing events in many molluscan species.
What are the salient features of Mollusca give example?
They respire through the general body surface, gills or pulmonary sac. The blood circulates through the open circulatory system. They have a pair of metanephridia that helps in excretion. The nervous system consists of number of paired ganglia and nerves.
Is Mollusca segmented?
The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. Mollusks may be primitively segmented, but all but the monoplacophorans characteristically lack segmentation and have bodies that are to some degree spirally twisted (e.g. torsion).
