Draw a phylogenetic tree of Bilateria that includes the ten...

Draw a phylogenetic tree of Bilateria that includes the ten phyla of bilaterians discussed in detail in this chapter. Label each branch that leads to a phylum with a C, P, or A, depending on whether members of the phylum are coelomates (C), pseudocoelomates (P), or acoelomates (A). Use your labeled tree to answer the following questions: "(a) For each of the three major clades of bilaterians, what (if anything) can be inferred about whether the common ancestor of the clade had a true coelom? (b) To what extent has the presence of a true coelom in animals changed over the course of evolution?

Transcript

00:01 Hi everyone, so in this particular question you need to make the phylogenic tree of the bilatria, which would comprise of the ten phyla.

00:11 Okay, so ten phyla of the bilatria.

00:14 So as you can see in this phylogenetic tree as well, that there are superphylams such as ectysoa, okay, so that would comprise of the nematodes, arthropods, all right, which are defined by the molting.

00:26 And also there is another group, another bilateral group, which is termed as a deuterostomia, which comprised of the hemicordates, echinoderms, chordates, chordates are the organisms or the vertebrates organisms.

00:43 They also belong to this group.

00:46 So next is the loophotrozoa, which would comprise of the platy helmynthes, rotifera, okay, and ectoprocta, brachyopoda, and annelids.

00:58 So in this particular question, what we need to figure out is we need to find out that which phylum is siloam, which comprised of the selom, so which one is silomate, which one is pseudo -celomate or another group is acilomate.

01:12 So we need to find out whether platy helmintas comprised of the selome or not.

01:18 So basically what are this silumate, a -silumate and pseudo -celomate? so we can say that the animals possessing the selom.

01:28 So they are termed as the celomate.

01:30 Okay, for example, the annelates.

01:32 So these are the celomates.

01:34 So in some animals, the mesoderm is present as scattered pouches.

01:39 In between the ectoderm and the endoderm, the outer layer and the inner layer...

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