Is Mollusca oviparous or viviparous?
Table of Contents
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?
Gastropods can be oviparous, ovoviviparous, or viviparous. Larval forms are present in some taxa.
Are molluscs herbivores?
Most molluscs are herbivorous, grazing on algae or filter feeders. For those grazing, two feeding strategies are predominant.
Do molluscs lay eggs?
Mollusks reproduce sexually. Slugs and snails are hermaphrodites (possessing both male and female organs), but they must still mate to fertilize their eggs. Most aquatic mollusks lay eggs that hatch into small, free-swimming larvae called veliger.
Are Mollusca Monoecious or dioecious?
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 echinoderms oviparous or viviparous?
All echinoderms are viviparous.
Do all molluscs have shells?
Not all shelled molluscs live in the sea; many live on the land and in freshwater. The ancestral mollusc is thought to have had a shell, but this has subsequently been lost or reduced on some families, such as the squid, octopus, and some smaller groups such as the caudofoveata and solenogastres.
Do Mollusca have appendages?
Hint: Arthropods and molluscs are both invertebrates. Arthropods are organisms having exoskeleton and segmented bodies with paired appendages….Differentiate between Arthropoda and Mollusca.
| Arthropoda | Mollusca |
|---|---|
| Arthropods have wings to fly with jointed legs usually to their abdominal segments. | Molluscs have a muscular foot that helps in locomotion. |
Are mollusks Heterotrophs or Autotrophs?
Yes, all mollusks are heterotrophic, because mollusks are animals, and all animals are heterotopic, meaning that they need to consume organic carbon…
Do mollusks have a larval stage?
Like many invertebrates, the mollusk life cycle includes one or more juvenile or larval stages that are very different from the adult form of the animal. Both mollusks and annelids develop through a larval stage called a trochophore larva. Mollusks reproduce sexually, and most species have separate sexes.
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.