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The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity.
- Which animal belongs to annelida?
- What are the three types of annelids?
- What are the most common types of annelids?
- Is a millipede an annelid?
- Are earthworms annelids?
- Why are earthworms annelids?
- Are annelids Acoelomates?
- Is a leech an annelid?
- What is the common name for Arthropoda?
- What are the 2 main groups of annelids?
- What are examples of Hirudinea?
- What type of worms are Polychaetes?
Which animal belongs to annelida?
A major invertebrate phylum of the animal kingdom, the annelids number more than 9,000 species distributed among three classes: the marine worms (Polychaeta), which are divided into free-moving and sedentary, or tube-dwelling, forms; the earthworms (Oligochaeta); and the leeches (Hirudinea).
What are the three types of annelids?
Most authors accept the annelids as having three major classes: Polychaeta, Oligochaeta, and Hirudinea.
What are the most common types of annelids?
Earthworms. Earthworms are probably the best known and most common of the annelids; more than 2,700 kinds of earthworms have been identified around the world.
Is a millipede an annelid?
The Annelid phylum contains three classes of organisms: Polychaeta, Oligochaeta and Hirudinea. ... The Arthropoda phylum contains five classes: Crustacea (shrimp and lobster), Arachnida (spiders and scorpions), Chilopoda (centipedes), Diplopoda (millipedes) and Insecta (roaches and beetles).
Are earthworms annelids?
The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity. Segmentation is also called metamerism.
Why are earthworms annelids?
Earthworms belong to a class of terrestrial annelids. Hence, earthworms share the characteristics of a typical annelid such as rounded body with segments, presence of a body cavity, complete digestive system, closed circulatory system, and hermaphroditic reproduction.
Are annelids Acoelomates?
The protostome coelomates (acoelomates and pseudocoelomates are also protostomes) include the mollusks, annelids, arthropods, pogonophorans, apometamerans, tardigrades, onychophorans, phoronids, brachiopods, and bryozoans. Deuterostomes include the chaetognaths, echinoderms, hemichordates, and chordates.
Is a leech an annelid?
leech, (subclass Hirudinea), any of about 650 species of segmented worms (phylum Annelida) characterized by a small sucker, which contains the mouth, at the anterior end of the body and a large sucker located at the posterior end. All leeches have 34 body segments. ... Leeches occur primarily in fresh water and on land.
What is the common name for Arthropoda?
arthropod, (phylum Arthropoda), any member of the phylum Arthropoda, the largest phylum in the animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes, and millipedes.
What are the 2 main groups of annelids?
For the purposes of this concept, we will consider two main classes of annelids: Polychaetae and Clitellata. The Clitellata are characterized by the presence of a specialized reproductive organ called the clitellum.
What are examples of Hirudinea?
The class Hirudinea in the phylum Annelida (segmented worms) comprises the leeches, the most highly specialized of the major annelid groups. Leeches are typically dorsoventrally flattened annelids with suckers at both ends and 34 body segments (designated I-XXXIV) which are externally divided into a number of annuli.
What type of worms are Polychaetes?
Polychaetes, which include rag worms, lugworms, bloodworms, sea mice, and others, are marine worms notable for well-defined segmentation of the body. Unique among annelids, most polychaete body segments bear a pair of parapodia (flat, lobelike outgrowths) with setae, or tiny bristles.
