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an aquatic mollusk that has a compressed body enclosed within a hinged shell, such as oysters, clams, mussels, and scallops.

Sentence: The bivalve washed ashore during the storm.

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1. an active predatory mollusk of the large class Cephalopoda, such as an octopus or squid.

Sentence: There are many different types of Cephalopodn who roam the ocean.

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a mollusk of the large class Gastropoda, such as a snail, slug, or whelk.

Sentence: The gardener noticed the trails of slime left behind by gastropods in the flowerbed.

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Trochophore: A free-swimming larval stage found in the development of many mollusks and certain other invertebrates.

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Trochophore: A free-swimming larval stage found in the development of many mollusks and certain other invertebrates.

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Under the microscope, the biologist observed the distinctive trochophore larvae in the water sample.

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The part of a mollusk's body that contains the internal organs, such as the digestive and reproductive systems.

During dissection, the students carefully examined the visceral mass of the clam.

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A thin membrane in mollusks that surrounds the visceral mass and secretes the shell.

The scientist studied how changes in temperature affected the growth of the mantle in oysters.

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The space between the mantle and the body wall in mollusks.

Sentence: Water enters and exits the mantle cavity of bivalves through specialized openings called siphons.

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A rasping, tonguelike structure in certain mollusks, used for feeding.

The snail used its radula to scrape algae off the rocks.

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A mass of nerve tissue that serves as a center of nervous activity in invertebrates.

Each ganglion in the octopus's nervous system plays a role in coordinating its movements.

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A twisting or rotation of the body during the development of certain mollusks, resulting in the anus and mantle cavity being located above the head.

Torsion is a significant evolutionary adaptation seen in many gastropod mollusks.

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The fluid that circulates in the open circulatory system of many invertebrates, including mollusks.

In some mollusks, hemolymph serves both as a transport medium and as a means of distributing nutrients.

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The primary body cavity in arthropods and mollusks, containing the hemolymph.

The surgeon carefully avoided puncturing the hemocoel while operating on the injured crustacean.

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A tube-like structure in certain mollusks that brings water into the mantle cavity.

The clam's incurrent siphon extended into the sandy substrate, drawing in water for filter feeding.

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A tube-like structure in certain mollusks that expels water from the mantle cavity.

When threatened, the octopus can expel ink through its excurrent siphon to confuse predators.

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An organ in aquatic animals, including mollusks, used for gas exchange.

The fishmonger inspected the gills of the shellfish to ensure their freshness.

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Sensory appendages found near the mouth of certain mollusks, used for feeding and sensing the environment.

The snail extended its palps to explore the leaf litter for food.

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A muscle in bivalve mollusks that controls the opening and closing of the shell valves.

The scallop's adductor muscle allowed it to quickly clamp its shell shut when threatened.

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Pigment-containing cells in the skin of certain mollusks and other animals, responsible for color changes and camouflage.

The cuttlefish's chromatophores shifted rapidly, matching its surroundings with astonishing precision.

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Describing organisms that are permanently attached to a substrate and do not move.

Barnacles are sessile crustaceans that attach themselves to rocks, ships, and other hard surfaces.