What are the two major groups of animals in Bilateria with bilateral symmetry?
The 2 groups of bilaterally symmetrical animals (the Bilateria)- protostomes and deuterostomes- differ in embryology. Possession of a coelom is an ancestral character of the clade comprising the protostome and deuterostomes.
What animal groups have bilateral symmetry?
Examples of animals that possess bilateral symmetry are: flatworms, common worms (“ribbon worms”), clams, snails, octopuses, crustaceans, insects, spiders, brachiopods, sea stars, sea urchins, and vertebrates. The symmetry of an animal generally fits its lifestyle.
What kingdoms have bilateral symmetry?
The vast majority of animals display bilateral symmetry; also known as plane symmetry, this is a trait that applies to 99% of all animals, in the majority of phyla: Chordata, Annelida, Arthropoda, Platyzoa, Nematoda, and most Mollusca.
Which 2 groups make up the bilaterians?
The Bilateria has traditionally been divided into two main lineages or superphyla. The deuterostomes include the echinoderms, hemichordates, chordates, and a few smaller phyla. The protostomes include most of the rest, such as arthropods, annelids, mollusks, flatworms, and so forth.
What are the two major clades of Bilateria?
The lophotrochozoan clade is still relatively poorly represented in terms of genomic resources compared to the other two major clades of bilaterians; the Ecdysozoa (containing arthropods, nematodes and other related phyla) and the Deuterostomia (chordates, echinoderms and hemichordates) [4].
Why are most animals bilaterally symmetrical?
Having bilaterally symmetrical bodies (the same on both sides along an axis) permit them to propel forward in a straight line. In evolutionary history, animals that moved quickly and efficiently from point A to point B would have been more successful and selected for than those who were ineffective at locomoting.
Which of the following is bilateral symmetry?
So, the correct answer is ‘Earthworm’
Which of the following is associated with bilateral symmetry quizlet?
Which of the following is associated with bilateral symmetry? Cephalisation. Many young animals are __________, a sexually immature form that is morphologically distinct from the adult stage.
Are all deuterostomes bilaterally symmetrical?
In turn, the deuterostomes belong to a larger group within the Animalia called the Bilateria, because they are bilaterally symmetrical with a left and a right side to their bodies.
What are major clades?
Bilaterians are divided into two major clades: Protostomia and Deuterostomia. Phylogenetic positions of the bilaterian clades Protostomia and Deuterostomia. Each clade is characterized by its ordering of embryonic development.
Are platyhelminthes bilaterally symmetrical?
Flatworms are bilaterally symmetrical with a defined head and tail region and a centralized nervous system containing a brain and nerve cords. Clusters of light-sensitive cells make up eyespots on either side of the head.
Which of the following is bilaterally symmetrical?
The correct answer is Aschelminthes. Aschelminthes is a group of animals that is bilaterally symmetrical and triploblastic.