Anatomy Of Mollusks

Molluscs are generally regarded members of the lophotrochozoa a group defined by having trochophore larvae and in the case of living lophophorata a feeding structure called a lophophore. The other members of the lophotrochozoa are the annelid worms and seven marine phyla.

Animal Kingdom Mollusks Snail Anatomy Of A Snail Image

The radula part of the odontophore may be protruded and it is used in drilling holes in prey or in rasping food particles from a surface.

Anatomy of mollusks. The image above is of a humboldt squid dosidicus which is the largest of the mollusks imaged. Most molluscs have a head with eyes and all have a pair of tentacles with sensors also on the head that detect chemicals vibrations and touch. The eyes of the giant squid are the largest in the animal kingdom almost the size of dinner plates.

The foot although the basic form of the foot is a flat broadly tapered muscular organ which is highly. These techniques are relatively quick and allow the anatomy to be scanned in rich detail while leaving the specimen intact and also can be done on live animals says biologist darlene ketten director of the computerized scanning and imaging facility at whoi and a coauthor of the paper. One of the special features of their body structure is the presence of a coelom.

Describe the morphology and anatomy of mollusks a large muscular foot that may be modified into tentacles but it functions in locomotion. They have a mantle a structure of tissue that covers and encloses the dorsal portion of the animal and secretes the shell when it is present. Gills respiratory organs located between the foot and the mantle formed of two layers of ciliated filaments which filter water and retain food particles.

The anatomystructures of molluscs are complex in nature. Only some species of molluscs have a brain. Genital gland producing spermatozoa sperm or ova eggs depending on the sex of the mollusk.

Of the five classes of mollusks four listed below are fairly common and the first three will be studied in the laboratory figure 1. Marine and freshwater filter feeders. Locomotion the foot is the organ of locomotion in land gastropods.

In swimming and sessile forms however the foot is greatly reduced or greatly modified. Characterized by a hinged shell of two valves parts and a foot used for digging. Z class bivalvia clams scallops and oysters.

The coelom is a cavity present in body of molluscs which contains internal organs suspended from mesenteries. The snail has both male and female organs. Radula plural radulae or radulas horny ribbonlike structure found in the mouths of all mollusks except the bivalves.

Genital gland located at the apex of the shell ensuring production of sperm and eggs.

Wisconsin Geological Natural History Survey Cephalopod