Aside from the molecular evidences, what morphological and physiological features of both the rotifers and acanthocephalans support this claim (belong to a single taxon) ? Explain your answe
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Aside from the molecular evidences, what morphological and physiological features of both the rotifers and acanthocephalans support this claim (belong to a single taxon) ? Explain your answer.
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- Rotifers and acanthocephalans previously belonged to separate phylum. But recent molecular studies and genome analysis show that acanthocephalans are sister groups of a class under Phylum Rotifera. And thus, the two should belong to a single taxon. Aside from the molecular evidences, what morphological and physiological features of both the rotifers and acanthocephalans support this claim? Explain your answer.The evolutionary ancestry of acanthocephalans is particularly obscure. Describe some characters of acanthocephalans that make it surprising that they could be highly derived rotifers.Describe and contrast the tegument of most turbellarians and the other classes of platyhelminths. Does the tegument provide evidence that trematodes, monogeneans, and cestodes form a clade within Platyhelminthes? Why?
- Label the parts that are visible of these rotifers and acanthocephalans: 1. Rotifer from class Bdelloidea 2. Rotifer from class MonogonontaDescribe and contrast the tegument of most turbellarians and the other classes ofPlatyhelminthes. Does the tegument provide evidence that trematodes,monogeneans, and cestodes form a clade within Platyhelminthes? Why?⮚ Given what you already know about tardigrades, would you agree that they are the toughest animals? Why or why not? ⮚ How are tardigrades able to survive in harsh conditions? ⮚ How is the biology of onychophorans related to their distribution? ⮚ What do you think is the trade – off, if any, during prey capture of velvet worms?
- Examine this whole mount of Branchiostoma (amphioxus) What is the function of this notochord? What happened to this structure in fishes and other vertebrates?Does the lack of a digestive system in tapeworms indicate that it is a primitive, ancestral form of Platyhelminthes? Explain your answer.Compare the body plan of Dugesia and cnidarians. Aside from differences in symmetry, what other innovative anatomical features did you observe in Dugesia that were not observed in cnidarians?
- Which of the following structures is not a component of the watervascular system of an echinoderm? a. Ossicles b. Ampullae c. Radial canals d. MadreporitesDoes Sahelanthropus share any anatomical traits with Ardipithecus that suggest bipedalism? Be explicit as to what traits and explain your answer.Discuss why some sa that hemichordates are said to be the missing link between the invertebrates and vertebrates.
