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Animal Bio Ch12

The segmental arrangement of body parts in an animal is called metamerism
The specialization of body regions in a segmented animal is called tagmatization
Annelids and Arthropods have been traditionally considered to be closely related. Recent reevaluation of these relationships places Annelids in the Lophotrochozoa. If this is true they would be more closely related to the Mollusca
Which group of animals do Annelids not share common ancestry with? Echinodermata
The annelid class whose members are mostly marine is Polychaeta.
A distinctive feature of members of the subclass Hirudinea is anterior and posterior suckers
Earthworms belong to the annelid subclass Oligochaeta
The Clitellata are believed to have evolved from a group of polychaetes that invaded freshwater habitats.
A distinctive feature of members of the class Polychaeta is parapodia
Recent morphological and molecular evidence has lead to this group of worms being included within the phylum Annelida echiurans
The girdle-like structure that is used for mucus secretion during copulation and cocoon formation is the clitellum.
A clitellum is present in the members of the subclass(es) Hirudinea and Oligochaeta
Oligochaetes are monoecious
Most polychaetes are dioecious
An excretory structure consisting of an open, ciliated funnel and a tubule that opens through the body wall is called a metanephridium
The main propulsive structure(s) in the circulatory system of an earthworm is (are) dorsal and ventral blood vessels
The _______ is a site of amino acid metabolism in an earthworm and is analogous to the vertebrate liver chloragogen tissue
No free-living larval forms occur in the annelid class or subclass(es) Hirudinea
Flexible support and efficient locomotion are probably the primary adaptive features of metamerism. True
Metamerism appears to have arisen just once in the evolution of animals. False
The peristomium is the first segment of a polychaete. It surrounds the mouth and bears sensory tentacles or cirri. True
During copulation of earthworms there is mutual sperm exchange. Sperm passes from the seminal receptacles of each worm to the seminal vesicles of the partner. False
The secondary divisions of a member of the class Hirudinea are called annuli; they are easier to see than the true segments. True
The looping form of locomotion of leeches utilizes a single hydrostatic cavity formed as a result of the loss of septa separating coelomic compartments. True
A taxonomic reevaluation of the phylum Annelida confirms the designation of three classes: Polychaeta, Oligochaeta, and Hirudinea. False
The oligochaetes were the first annelids to be derived from ancestral annelids. The hirudineans and freshwater polychaetes were derived from the oligochaetes, and marine polychaetes were derived from freshwater polychaetes. False
Oligochaetes evolved on land during a time when flowering plants were proliferating. This fact is evidenced, in part, by the reliance of modern oligochaetes on deciduous vegetation. True
The immature stages of polychaetes occur in cocoons deposited on the ocean floor. False
Current evidence indicates that Polychaeta is a probably a paraphyletic grouping. True
Created by: skmmonks



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