BIO 106 For Exam 2. STUDY. PLAY. A researcher discovers a new unicellular organism that contains a single circular chromosome and no membrane-bound organelles. Upon closer observation, the researcher notices that this organism can also fix nitrogen and produce methane. ... Annelids are characterized by: (select all that apply) A. Cylindrical ...
Members are segmented worms Lophotrochozoan branch of animalia. Share a common ancestry with Mollusca, Brachopoda, Bryozoa, Nemertea, and many others. There are roughly 15,000 species of annelids. Learn with flashcards, games, and more — for free.
Annelid: Annelid, any member of a phylum of invertebrate animals that are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they take their name. The coelom is reduced in leeches, and
Besides being segmented, the body wall of annelids is characterized by being made up of both circular and longitudinal muscle fibers surrounded by a moist, acellular cuticle that is secreted by an epidermal epithelium. All annelids except leeches also have chitonous hair-like structures, called setae, projecting from their cuticle.
Define annelid. annelid synonyms, annelid pronunciation, annelid translation, English dictionary definition of annelid. n. Any of various worms or wormlike animals of the phylum Annelida, characterized by an elongated, cylindrical, segmented body and including the earthworms...
The Clitellata are a class of annelid worms, characterized by having a clitellum - the 'collar' that forms a reproductive cocoon during part of their life cycles. The clitellates comprise around 8,000 species.Unlike the class of Polychaeta, they do not have parapodia and their heads are less developed.
8. How is the respiratory system of species of the phylum Annelida characterized? Respiration in annelids can be cutaneous or branchial. Cutaneous respiration occurs through the large amount of veins under the epidermis. Gills are present in aquatic annelids are located in the parapodia (false claws), which have an extensive network of capillaries.
Annelids are considered members of the Lophotrochozoa, a "super-phylum" of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans. The basic annelid form consists of multiple segments. Each segment has the same sets of organs and, in most polychates, has a pair of parapodia that many species use for locomotion.
Annelids; Annelids. Annelid, any member of a phylum of invertebrate animals that are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they take their name. The coelom is reduced in leeches, and...
Annelida is a group commonly referred to as segmented worms, and they are found worldwide from the deepest marine sediments to the soils in our city parks and yards. Through most of the 20th century Annelida was split into three major groups; Polychaeta, Oligochaeta (earthworms etc.) and Hirudinea (leeches).