Animal Sciences. A-Crep by Allan B. Cobb

By Allan B. Cobb

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And William T. Keeton. Biological Science, 6th ed. New York: W. W. , 1996. , Larry S. Roberts, and Allan Larson. Animal Diversity. Dubuque, IA: Wm. C. Brown, 1994. Hildebrand, Milton. Analysis of Vertebrate Structure. New York: John Wiley, 1994. Allometry The relationship of the growth of one part of an organism to the growth of another part or the growth of the whole organism is called allometry. The term also applies to the measure and study of such growth relationships. ” Isometric growth, where the various parts of an organism grow in one-to-one proportion, is rare in living organisms.

Annelids have a true coelom, that is, one that is lined with cells originating from the embryonic mesoderm. The coelom is fluid-filled, which creates hydrostatic (water) pressure and acts as a hydrostatic skeleton. Annelids have a well-developed, closed circulatory system (one in which blood is limited to vessels) that is segmentally arranged. They also have a complete, one-way digestive tract with a mouth and anus. The digestive tract is not segmented. Annelida Respiration in annelids occurs primarily through their moist skin, although certain species have evolved specialized gills or use paired projections called parapodia in gas exchange.

Gametes (eggs and sperm) are shed into the water, and fertilization is external. Development is indirect, via a trochophore larval stage. The polychaetes are believed to be the most primitive of the annelid classes. Some species, however, are highly specialized. Various species of earthworms typically feed on organic debris and are capable of passing large quantities of soil through their guts. 31 Annelida Oligochaeta. The class Oligochaeta includes the familiar terrestrial earthworms, found just about everywhere, as well as some freshwater annelid species.

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