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Definition: Many marine mollusks attain or increase their predatory efficiency using complex chemical secretions, which are often produced and delivered through specialized anatomical structures of the foregut

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Definition: An ink sac is an anatomical feature that is found in many cephalopod mollusks used to produce the defensive cephalopod ink.

Non Example: Pen

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Definition: The radula is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus

Non Example: Teeth

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Definition: Is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda. Siphons in molluscs are tube-like structures in which water flows. The water flow is used for one or more purposes such as locomotion, feeding, respiration, and reproduction.

Non Example: Nose

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Definition: The gill filament adductor muscles contract twice during a normal respiratory cycle.

Non Example: Lungs

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Definition: The primary function of the is muscle group is to adduct the thigh at the hip joint

Non Example: Hip muscle

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Definition: One of a pair of elongated, often segmented appendages usually found near the mouth in invertebrate organisms such as mollusks, crustaceans, and insects, the functions of which include sensation, locomotion, and feeding

Non Example: Antennae

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Definition: The gastropods, commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda. This class comprises snails and slugs from saltwater, from freshwater, and from the land.

Non Example: Cows

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Definition: A cephalopod is any member of the molluscan class Cephalopoda such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles modified from the primitive molluscan foot.

Non Example: Ants

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Definition: Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as mollusks

Non Example: Fish

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Definition: A body part of the Entoprocta from which tentacles arise and the mouth and anus are located.

Non Example: Body

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Definition: Crinoids are marine animals that make up the class Crinoid, one of the classes of the phylum Echinodermata, which also includes the starfish, brittle stars, sea urchins and sea cucumbers.[3] Those crinoids which, in their adult form, are attached to the sea bottom by a stalk are commonly called sea lilies, while the unstalked forms are called feather stars or comatulids,

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Definition: Sea cucumbers are echinoderms from the class Holothuroidea. They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. Sea cucumbers are found on the sea floor worldwide

Non Example: Pigs

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Definition: Sea urchins are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean. The spherical, hard shells of sea urchins are round and spiny, ranging in diameter from 3 to 10 cm.

Non Example: Cows

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Definition: Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea.

Non Examples: Pigs

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Definition: Helps keeps sea lily's attached to the sand

Non Example: Hook

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Definition: Starfish have sexual organs, or gonads, in each arm. During a breeding season the males' gonads fill with sperm and the females' gonads fill with eggs.

Non Example: Ovaries

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Definition: a tube in many echinoderms that contains calcareous deposits and leads from the madreporite to the ring of the water-vascular system surrounding the mouth.

Non Example: Teeth

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Definition: An essential part of the circulation system in echinoderms. Through this plate the echinoderm draws in seawater and expels water to fuel its vascular system. The madreporite functions like a trap door through which water can move in and out in a controlled manner.

Non Example: Heart

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Definition: The circular tube of the sea star's water vascular system that connects the stone canal to the ampullae in its rays

Sentence: The ring canal connects the radial canals and the radial canals move water into the ampullae, which have tube feet through which the water moves

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Definition: The radial canal which is across each arm of the sea star has tooth-like structures called ampullae, which surround the radial canal. The aboral surface is also covered with papule that are involved with the sea star's respiratory system.

Non Example: Spine

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Definition: A pouch or sack-like part of the sea star's water vascular system that expands and contracts to move water up and down each tube foot. When the sea star wants to create a suction at the end of its tube foot, its ampullae pulls water out of the podia.

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Definition: a large number of small flexible hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food and operated by hydraulic pressure within the water-vascular system.

Non Example: Human Feet

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Definition: A phylum of marine invertebrates which includes starfishes, sea urchins, brittle stars, crinoids, and sea cucumbers. They have fivefold radial symmetry, a calcareous skeleton, and tube feet operated by fluid pressure.

Non Example: Cats