BIS2C_Lect26_Ward_Development___Sponges_ppt

C animals with diploblastic development form a

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Unformatted text preview: imals with diploblastic development form a paraphyletic group. d. Animals with triploblastic development are a clade. Sponges (Porifera) The older edition of your textbook (Life, 8th Edition) treated sponges as a paraphyletic group comprising three clades: 1. glass sponges (Hexactinellida) 2. demosponges (Demospongiae) 3. calcareous sponges (Calcarea) What would this suggest about the features observed in thi th sponges? Major lineages of metazoans, according to older (8th) edition of Life 3 Sponges (Porifera) Clicker Question 2. Pick the best answer. Based on the phylogeny presented in the older edition of your textbook (Life, 8th Edition), features shared among sponges are likely to represent: a. b. c. d. If sponges were a paraphyletic group, as in the phylogeny below, the most parsimonious interpretation would be that features observed in sponges trace back to their MRCA – which is the MRCA of all animals! Eumetazoan synapomorphies. Synapomorphies of the glass sponges. Ancestral metazoan conditions. Convergen...
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