Anatomy Of Mollusks

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. The image above is of a humboldt squid dosidicus which is the largest of the mollusks imaged.

Solved Figure 28 20 Which Of The Following Statements About

Gills respiratory organs located between the foot and the mantle formed of two layers of ciliated filaments which filter water and retain food particles.

Anatomy of mollusks. 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. The other members of the lophotrochozoa are the annelid worms and seven marine phyla. Genital gland located at the apex of the shell ensuring production of sperm and eggs.

Marine and freshwater filter feeders. The coelom is a cavity present in body of molluscs which contains internal organs suspended from mesenteries. Z class bivalvia clams scallops and oysters.

In swimming and sessile forms however the foot is greatly reduced or greatly modified. 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 anatomystructures of molluscs are complex in nature.

Of the five classes of mollusks four listed below are fairly common and the first three will be studied in the laboratory figure 1. The eyes of the giant squid are the largest in the animal kingdom almost the size of dinner plates. Genital gland producing spermatozoa sperm or ova eggs depending on the sex of the mollusk.

The foot although the basic form of the foot is a flat broadly tapered muscular organ which is highly. 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. Radula plural radulae or radulas horny ribbonlike structure found in the mouths of all mollusks except the bivalves.

The snail has both male and female organs. Locomotion the foot is the organ of locomotion in land gastropods. Describe the morphology and anatomy of mollusks a large muscular foot that may be modified into tentacles but it functions in locomotion.

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. Characterized by a hinged shell of two valves parts and a foot used for digging. One of the special features of their body structure is the presence of a coelom.

Only some species of molluscs have a brain.

Phylum Mollusca Ppt Download