Table of Contents
What are the main examples of molluscs?
clams, mussels, oysters, and scallops (class Bivalvia)
- ark shell (family Arcidae)
- cockles (family Cardiidae)
- coquina clam (genus Donax)
- gaper clams (Tresus nuttallii and Tresus capax)
- geoduck (Panopea generosa)
- jingle shells (family Anomiidae)
- mussels (families Mytilidae and Unionidae)
- genus Nuculana.
What category of invertebrates are starfish?
class Asteroidea
sea star, also called starfish, any marine invertebrate of the class Asteroidea (phylum Echinodermata) having rays, or arms, surrounding an indistinct central disk.
What kind of blastula is found in starfish?
A starfish egg, denuded of the fertilization membrane and placed on a glass surface, becomes a cell monolayer after several cleavages. This sheet of cells folds and forms a hollow sphere resembling a normal blastula at the 29–210-cell stage (‘closing movement’).
Which animal belongs to Mollusca?
Classification
| Class | Major organisms |
|---|---|
| Gastropoda | all snails and slugs including abalone, limpets, conch, nudibranchs, sea hares, sea butterflies |
| Bivalvia | clams, oysters, scallops, geoducks, mussels, rudists† |
| Polyplacophora | chitons |
| Cephalopoda | squid, octopuses, cuttlefish, nautiluses, Spirula, belemnites†, ammonites† |
Do starfish have mesoderm?
The slide of stages in starfish development illustrates stages from unfertilized egg to gastrula—typical of echinoderms and chordates that have very little yolk in the egg. Three embryonic cell layers—ectoderm, endoderm, and mesoderm—are established. All adult tissues are derived from these layers.
Is starfish a type of invertebrate?
Some of the most common types of invertebrates are: protozoans – single-celled organisms such as amoebas and paramecia annelids – earthworms, leeches echinoderms – starfish, sea urchins, sea cucumbers mollusks – snails, octopi, squid, snails, clams arthropods – insects, spiders, crustaceans such as shrimp, crabs, lobsters
What are the important characteristics of Mollusca?
One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical.
Which phylum is the starfish in?
The echinoderm phylum includes starfish, sea urchins, and sea cucumbers. About 6,000 species exist today. They are mostly marine animals. Traits: First, echinoderms have bilateral symmetry as larva.