BIO 2135 Study Guide - Annelid, Peristomium, Prostomium
Annelida-Key Terms
Aciculum:
Alpha-chitin:
Annelida:
Aortic arches:
Beta-chitin:
Calciferous glands:
Chloragogen tissue:
Chloragogue tissue:
Clitellum: special fused metameres in oligocheates and leeches that secrete mucous
during mating
Cocoon:
Crop: Any portion of the anterior part of the digestive tract used to store food prior to its
digestion.
Dorsal vessel:
Errant: mobile and actively moving organisms.
Giant axon:
Gizzard: Muscular, grinding part of the digestive system. In birds, it is an enlargement of
the anterior part of the stomach; in invertebrates, it is part of the foregut that may also be
lined with cuticular plates and teeth.
Hydrostatic Skelton: Formed from fluid-filled and closed cavity surrounded by a body
wall containing muscles oriented in different directions. Muscular contractions maintain
the rigid form or change the shape of the organism allowing movement.
Intestinal vessel:
Metamerism: The division of the body into a series of identical units, metameres,
repeated down the longitudinal axis of the aimals. Each metamere contains identical
strcutres to the adjacent metameres.
Metanephridia: An excretatory osmoregulatory organ consisting of a ciliated funnel,
nephrostome, connected to tubules that lead to the external nephridiopore. The
nephrostome collects coelomic clued, and all of its contents, to produce the urine.
Metanephridial vessel:
Nephridiopore: external openings to nephridia in invertebrate excretory systems.
Nephrostome: Open-ciliated funnel of the metanephridium; move coelomic fluid directly
into the metanephridium without ultrafiltration.
Neuropopodium:
Notopodium:
Oblique muscles:
Prapodium:
Pericaridal cavity:
Peristomium: The part of the body behind the prostomium in annelids that contains the
oral opening. Like the prostomium it is not a true segment and and has no setal hairs,
whihch are characteristics of the phylum.
Prostomium: The most anterior part of an annelid found just in front of the mouth. Like
the peristomium, it is not a true segment.
Pydigium: the most posterior part of a segmented animal that houses the anal opening.
The pygridium is not a true segment.
