The Dorsal Part Of The Mantle Is A Linear Series Of Calcareous Overlapping Plates

The dorsal part of the mantle is a linear series of calcareous overlapping plates

The Dorsal Part Of The Mantle Is A Linear Series Of Calcareous Overlapping Plates

The chiton is a marine and slow-moving animal, attached to rocks between rocks, empty shells, corals and traces of tides. Usually called a marine mouse, measuring about 1 to 5 cm. The body is oval, bilaterally symmetrical and dorsally flattened and differentiated into a dorsal mantle forming a small, obscure head, a large flat foot and a roof-like cover. The head consists of abdominal mouth and labial palps. Under the head is the sole abdomen of the foot. Eyes and traps are absent. The mouth and anus are opposite ends. The dorsal part of the mantle consists of a linear series of 8-calcareous overlapping plates marked with lines of growth.

The edges of the mantle form the mantle girdle. Several pairs of dipactinate catenidia for respiration. Chiton is sometimes eaten by humans. The foot is called the sea beel. Class II: Scaphopoda (gr., Scafa = boat + podos = feet) tooth shells or tooth shells. Shell and mantle tubular, curved and open at both ends. E.g. Dentium Example: Dentium dorsal shell opening - shell captacula ft a fig.

Systematics Example: Shell stitches step Apex Penaltymate Voral Peristome Body Voral Nucleus Growth Orchulum Lines or Varicose Concentric Lines of Growth Navel Outer Lip Inner or Columbular Lip Fig. The pale yellow globosa is one of the largest freshwater gastropods abundant in ponds, in tanks, rice fields, and in lush vegetation. Usually called freshwater apple snail. The body is covered with a thick yellow or brown circular unilateral shell, with a body circumference, the last angle and the apex.

Each partition is separated by stitches. The surface of the shell is marked by lines of growth. The shell is spirally coiled around the axis, called the columela, which opens outward from the mouth of the hole. The type of coiling is right handed and is called dextral. After removing the shell, the soft part contains the mass of the head, legs and an intestine. The mouth of the shell is wide, and covered by the operakulam, which is attached to the back of the foot and shows concentric rings of growth around the nucleus, the navel and columbular lip are placed closely.

The zoology head is upwards and has 1 pair of eyes. The foot is highly muscular and acts as a crawling organ. The mass of the intestine is spirally coiled and has internal organs. It is covered with mantle or pallium. When the foot protrudes during the living stage, the head, nasal lobes, eyes, tentacles etc. are seen from a distance. These structures are observed after the shell is removed. Gender is different but without s*xual dimorphism.

Yellow is the slowest moving animal but it has great medicinal, experimental and study value. Category IV: Pelesipoda (gr., Pelexus = Bachet + Podos = feet)% 3! Or bivalve (lamelibranchia) biennial shell made of 2 lateral valves. 1 or 2 pairs of mantle flattened gills. E.g. Unio Example: Unio Umbo Hinge Ligament Lines of Growth Excellent Siphon Inhalant Siphon.