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What are the diagnostic features of Mollusca?

What are the diagnostic features of Mollusca?

Characteristic Features of Phylum Mollusca

  • They are bilaterally symmetrical.
  • They are triploblastic, which three layers.
  • They show organ system grade of organisation.
  • The body is soft and unsegmented.
  • Body is divisible into three regions – head, a visceral mass, and ventral foot.
  • Body is covered by a mantle and shell.

What are the 4 basic features of all mollusks?

Main characteristics of Mollusca :

  • Unsegmented soft body with bilateral symmetry.
  • Presence of an internal or external shell.
  • A toothed tongue (made mostly of chitin) called the radula.
  • A mantle which is a fold in the body wall that lines the shell.
  • Muscular foot (and/or tentacles in some).

What are the main characteristics of Aves?

Characteristics of Aves

  • Birds are warm-blooded animals.
  • Their forelimbs are modified into wings.
  • They have well-developed flight muscles that help during the flight.
  • Their hind limbs are adapted for walking, hopping, perching, grasping, wading and swimming.
  • There are epidermal scales on their legs.

What is a common feature of all mollusks?

WHAT FEATURES DO MOLLUSKS HAVE IN COMMON? As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.

What is the main characteristic that all molluscs have in common?

Mollusks have a soft body and share several characteristics, including a muscular foot, a visceral mass of internal organs, and a mantle.

What are the major groups of Mollusca?

The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods). The largest group is the gastropods. These are mollusks like snails and slugs that have just one shell or no shell at all. Gastropods creep along on their broad foot.

What are the 5 main classes of Mollusca?

The Phylum Mollusca consist of 8 classes: 1) the Monoplacophora discovered in 1977; 2) the worm-like Aplacophora or solenogasters of the deep sea; 3) the also worm-like Caudofoveata; 4) the Polyplacophora, or chitons; 5) the Pelecypoda or bivalves; 6) the Gastropoda or snails; 7) the Scaphopoda, or tusk shells; and 8) …

What are the four characteristics of Aves?

What are the main features of amphibians?

Amphibians

  • Amphibians are vertebrates.
  • Their skin is smooth and slimy.
  • Amphibians breath through their skin, as well as their lungs in some cases.
  • Amphibians are cold-blooded.
  • They have a complex life cycle (larval and adult stages).
  • Many species of amphibians vocalize.

What are five characteristics of phylum Mollusca?

Molluscs (also know as mollusks) are soft-bodied, bilaterally symmetrical, segmented, coelomate animals; usually shelled having a mantle, ventral foot, anterior head, and a dorsal visceral mass.

What do you know about phylum Mollusca?

In this article we will discuss about the Phylum Mollusca:- 1. Classification of Phylum Mollusca 2. Diagnostic Features of Phylum Mollusca 3. Classification 4. Systematic Resume. Phylum Mollusca is one of the most conspicuous invertebrate animals.

What are the 4 groups of molluscs?

There are four major groups within the phylum Mollusca: Class Polyplacophora consists of chitons, snail-like molluscs with eight-part overlapping scale shells (Fig. 3.51 A). Class Gastropoda are true snails and slugs (Fig. 3.51 B).

What is the function of the statocysts in Mollusca?

Phylum Mollusca is the second largest phylum. A few molluscs such as Unio possess green glands which mimic the liver in vertebrates. They possess osphradia to test the chemical nature of water. The statocysts maintain body equilibrium.

What is the classification of Molusca?

Ruppert and Barnes (1994), Meglitsch and Schram (1991) divided Molusca into 7 classes, while Parker and Haswell (1972), Morton and Yonge (1964) have clubbed class Aplacophora and Poly- placophora into a single class Amphineura. Barnes et al. (1999) has split Aplacophora into two classes Chaetodermorpha and Neomeniomorpha.