What is the class Polychaeta?

polychaete, any worm of the class Polychaeta (phylum Annelida). About 8,000 living species are known. Polychaetes, which include rag worms, lugworms, bloodworms, sea mice, and others, are marine worms notable for well-defined segmentation of the body.

Which characteristic is unique to polychaete annelids?

Polychaetes are distinguished from other annelids by having pairs of appendages called parapodia attached to the outside of each segment. Parapodia are shaped like paddles, and they are used for both locomotion and respiration.

Is the example of class Polychaeta?

Polychaete/Lower classifications

What characteristics distinguish the Oligochaeta from the Polychaeta?

The main difference between polychaetes and oligochaetes is that the polychaetes have a pair of parapodia per body segment that bear many bristles. But, oligochaetes have few bristles on their outer surface of the body but, no parapodia.

What is the most obvious feature of polychaetes?

Polychaetes are particularly common on and in muddy and sandy shores. Their most obvious feature are the pairs of parapodia appendages. One pair comes from each body segment. These parapodia are used for crawling and swimming.

What are 4 characteristics of annelids?

They have a well-developed nervous system. The circulatory system is closed type. They are hermaphrodites. They might possess fin-like appendages called parapodia.

How are polychaetes different from other annelids?

Polychaetes differ from other annelids in having a well differentiated head with specialized sense organs and no clitellum. They have many setae, usually arranged in bundles on the parapodia. The head bears eyes, antennae, and sensory palps.

What is the difference between leeches and polychaetes?

Polychaetes are the most diverse group of annelids and most live in the marine environment. They differ from earthworms and leeches in that they have appendages called parapodia and do not possess a clitellum. In size they range from 1 mm (0.04”) to 3 m (10′) but most are around 10 cm (4”).

What is unique about a Oligochaeta?

Oligochaetes, which range in length from a few millimetres (a fraction of an inch) to more than 3 m (10 feet), are notable for the absence of a head and parapodia, the flat, lobelike outgrowths used by many polychaete annelids (class Polychaeta) for locomotion. They have few setae, or bristles, on the body.

Which of the following is a characteristics of annelids?

So the correct answer is ‘Metameric segmentation‘.

What is defining characteristic of the phylum Annelida?

annelid, phylum name Annelida, also called segmented worm, 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.

What are characteristics or examples of phylum Annelida quizlet?

Body wall with outer circular and inner longitudinal muscle. specialization of head region into differentiated organs, such as tentacles, palps, and eyespots of polycaetes. Capable of complete regeneration. asexual reproduction by budding in some.

Which of the following characteristics is not characteristic of annelids?

Thus being ‘pseudocoelomate‘ is the only character not possessed by animals of the phylum Annelida. Hence, the correct answer is option A, i.e., Pseudocoelomate.

What are the three classes of phylum Annelida?

Critical appraisal. Most authors accept the annelids as having three major classes: Polychaeta, Oligochaeta, and Hirudinea.

What are three examples of annelids?

The annelids /ˈænəlɪdz/ (Annelida /əˈnɛlɪdə/, from Latin anellus, “little ring”), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.

What are the 7 classification of earthworm?

The seven categories of biological taxonomy are Kingdom, Phylum, Class, Order, Family, Genus and Species. All living organisms belong to specific groups within these categories, most of which have already been established, and earthworms are no exception.

What are 3 characteristics of worms?

Characteristics. All worms are bilaterally symmetrical, meaning that the two sides of their bodies are identical. They lack scales and true limbs, though they may have appendages such as fins and bristles. Many worms have sense organs to detect chemical changes in their environments, and some have light-sensing organs.