Assuming the arthropod phylogenetic relationships discussed in chapter 15,which of the following statements are accurate? Check all that apply.
A) Biramous appendages of trilobites and crustaceans had separate origins,they are not homologous.
B) The uniramous appendages of hexapods arose from a bilateral ancestral form.
C) Chelicerae of arachnids and mandibles of crustaceans are homologous.
D) An exoskeleton with jointed appendages is unique to the arthropods.The phyla most closely related to the arthropods are characterized by an exoskeleton with non-jointed appendages.
E)The mandibles of crustaceans and insects are homologous.The mandibles of myriapods may also be homologous to those of crustaceans and insects.
F)The traditional subphylum names "Crustacea" and "Hexapoda" should be abandoned or redefined.

Question

Quizplus · Accepted Answer

If arthropod relationships are as described in this chapter,then the following are true.Trilobites are a sister group to all other arthropods.Trilobite biramous appendages must have originated separately from those of crustaceans.Hexapods form a monophyletic group within the paraphyletic "Crustacea."Hexapod uniramous appendages must be secondarily derived.Mandibles arose within the Pancrustacea.Mandibles are not homologous to arachnid chelicerae.Onychophora and Tardigrada have non-jointed appendages associated with their exoskeleton,while arthropod appendages are jointed.Crustacea is a paraphyletic grouping and probably should be abandoned as a subphylum as it is traditionally defined.

Assuming the Arthropod Phylogenetic Relationships Discussed in Chapter 15,which of the Following