The Nematoda or roundworms, are perhaps the second largest animal phylum, and are also invertebrates. Roundworms are typically microscopic, and occur in nearly every environment where there is water. A number are important parasites. Smaller phyla related to them are the Kinorhyncha, Priapulida, and Loricifera.
Which is the 2nd largest phylum?
Mollusca is the second largest Phylum in the Animal Kingdom.
Which is the largest and second largest phylum among Kingdom Animalia?
Mollusca composes the 2nd largest phylum of animal kingdom after arthropods, which is the largest phylum in the animal kingdom. Around 85,000 species of molluscs are recognised. Molluscs is the largest marine phylum, comprising about 23% of all the named marine organisms.
Is phylum Mollusca the largest second largest or third largest phylum in the world?
Introduction. The vast majority of animal diversity (∼99%) is comprised of invertebrates, and members of the phylum Mollusca are the second largest phylum with up to 110 000 living species, most of which are marine.
What is the largest invertebrate group?
Arthropods are invertebrates with hard outer shells (exoskeletons), with jointed legs, and with segmented bodies. Since about 75% of all animal species are arthropods, they represent the largest invertebrate group.
Which is the largest class in animal kingdom?
The biggest class of animal kingdom is? Answer: Insecta is a class of invertebrates. They are placed within the phylum Arthropoda. The characteristics of group Insecta are that they have six legs or three pairs of legs.
What are the 9 major phyla?
- * Porifera (sponges)
- * Cnidaria (jellyfish, corals, anenomes)
- * Platyhelminthes (flatworms)
- * Nematoda (roundworms)
- * Mollusca (bivalves, squid)
- * Annelida (segmented worms)
- * Arthropoda (arachnids, crustaceans, insects)
- * Echinodermata (starfish, urchins)
Is second largest phylum in Animal Kingdom a Mollusca B Arthropoda C porifera D platyhelminthes?
There are 10 distinct phylum in animal kingdom, and they are porifera, Coelenterata, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordate, Chordata. The largest animal kingdom is Arthropoda and Mollusca comes second.
What phylum is the body segmented?
Phylum Annelida includes vermiform, segmented animals. Segmentation is seen in internal anatomy as well, which is called metamerism. Annelids are protostomes. These animals have well-developed neuronal and digestive systems.
Which one of the following belongs to Mollusca?
The animals belonging to the phylum Mollusca are apple snail, pearl oyster, devil fish, tusk shell, etc. Hence correct answer is option A.
Which phylum contains the greatest number of species of animals?
The arthropod phylum includes all insects, spiders and millipedes, as well as crustaceans and sea spiders. The long-extinct trilobites were also arthropods. Arthropoda is currently the largest phylum, with well over a million species.
What is true Mollusca?
Mollusca have bilateral symmetry and they have CaCO3 (calcareous) shell. Was this answer helpful?
What is visceral mass?
visceral mass: the soft, non-muscular metabolic region of the mollusc that contains the body organs. mantle: the body wall of a mollusc, from which the shell is secreted.
Is snake a vertebrate?
Snakes belong to the vertebrates, along with all other reptiles and amphibians, mammals, birds, and fish. All these animals have an inner skeleton. Bones give structure and strength to bodies.
Is a frog an invertebrate?
So, Are Frogs Vertebrates or Invertebrates? Frogs are vertebrates. In other words, they do have a backbone and a complex skeletal system just like other vertebrates. In the animal kingdom, frogs are classified as amphibians.
Which is the largest group?
Answer: Domain is the largest group in that it breaks all living things into three broad categories. Species is the smallest group in the classification system.