Is a Ctenophore a metazoan?

Is a Ctenophore a metazoan?

Introduction. Ctenophores (also known as comb jellies or sea gooseberries) are free-living marine organisms. They represent a non-bilaterian lineage of Metazoa (besides cnidarians, sponges, and placozoans) of particular importance for understanding early animal evolution.

What are basal Metazoa?

Basal metazoans comprise the four non-bilaterian animal phyla Porifera (sponges), Cnidaria (anthozoans and jellyfishes), Placozoa (Trichoplax) and Ctenophora (comb jellies).

What is the sister group of platyhelminthes?

Catenulids form the sister group to the rest of platyhelminths, whereas a complex clade formed by Acoela, Tricladida, “Dalyellioida,” and perhaps “Typhloplanoida” is sister to Neodermata.

What does it mean if two species are sister taxa?

When two lineages stem from the same branch point, they are called sister taxa. A branch with more than two lineages is called a polytomy and serves to illustrate where scientists have not definitively determined all of the relationships.

Is a sea star a Eumetazoa?

Eumetazoa (from Ancient Greek εὖ (eû) ‘well’, μετά (metá) ‘after’, and ζῷον (zôion) ‘animal’), also known as Diploblasts, Epitheliozoa, or Histozoa, are a proposed basal animal clade as a sister group of the Porifera (Sponges)….Eumetazoa.

Does comb jelly still exist?

Despite going extinct over 400 million years ago, ancient comb jellies are still blowing scientists away. Long thought of as entirely soft-bodied creatures — like their modern counterparts — these predatory marine animals may have had hard, skeleton-like parts, according to a study published in Science Advances today.

Are insects metazoans?

Everything from sponges and jellyfish to insects and vertebrates is belongs in “Metazoa”, and considered to have evolved from a single unicellular choanoflagellate ancestor, sometime during the Ediacaran period.

Which one of the following is an example of phylum Platyhelminthes?

Schistosoma is a parasitic flatworm belonging to phylum Platyhelminthes. Thus, the correct answer is option B.

What is an example of sister taxa?

Sister taxa or sister groups are pairs of terminal taxa and/or clades that branch from a common node and are often considered closely related. Pairs of sister terminal taxa in the figure above include: B and C, E and F, and G and H.

What is a sister group example?

An example is birds, whose commonly cited living sister group is the crocodiles, but that is true only when discussing extant organisms; when other, extinct groups are considered, the relationship between birds and crocodiles appears distant.