Is Nemertea a Deuterostome or Protostome?

Is Nemertea a Deuterostome or Protostome?

Also Know, is Nemertea a Deuterostome or Protostome? The Acoelomorpha, which are neither protostomes nor deuterostomes, are regarded as basal bilaterians. As a second line of defense, many ribbon worms are poisonous and taste bad.

Are ribbon worms segmented?

Some species live on land or in freshwater. Unlike annelids, ribbon worms are not segmented. Despite their soft, delicate appearance, ribbon worms are fearsome predators of annelid worms, clams, crabs and even fish. Ribbon worms feed using a proboscis which is kept tucked inside their bodies when not needed.

Is Nemertea a coelom?

Flatworms (phyla Platyhelminthes, Nemertea, and Mesozoa) lack a coelom, although nemerteans have a fluid-filled……

How is the rhynchocoel different from the coelom?

The rhynchocoel is an internal cavity lined by mesoderm that forms by schizocoely, making it a true coelom; however, a typical coelom forms a fluid-filled cavity around the digestive tract.

Are Nemertea Diploblastic or Triploblastic?

Place among living organisms

Kingdom Animalia Sub-kingdom Parazoa	Phyum Porifera: sponges, colonies of cells without apparent specialization of function
Nemertea	also flattened worms, but have circulatory system and anus; unsegmented, triploblastic
Nematoda	roundworms; unsegmented, triploblastic

What’s the longest worm in the world?

Microchaetus rappi
The longest earthworm is Microchaetus rappi of South Africa. In 1967 a giant specimen measuring 6.7 m (21 ft) in length when naturally extended and 20 mm (0.8 in) in diameter was found on a road between Alice and King William’s Town.

Are polychaete worms segmented?

Polychaetes are a diverse and abundant group of segmented worms. They are commonly known as bristle worms because of their characteristic hairs called ‘chaetae’.

Which is the longest worm?

bootlace worm
Lineus longissimus, the bootlace worm, is known as the longest animal on earth with a body length of up to 50 m (Fig. 1). This species belongs to the anoplan nemerteans, carrying a proboscis without a stylet.

Are Nemertea flatworms?

Traditional taxonomy says that nemerteans are closely related to flatworms. Both phyla are regarded as members of the Lophotrochozoa, a very large “super-phylum” that also includes molluscs, annelids, brachiopods, bryozoa and many other protostomes.

What organisms are Pseudocoelomates?

The pseudocoelomates include the nematodes, rotifers, gastrotrichs, and introverts. Some members of some other phyla are also, strictly speaking, pseudocoelomate. These four phyla of tiny body size (many species no larger than the bigger protozoans) are placed together in part because they…

How big is the body of a Nemertea?

1. Body of Phylum Nemertea is mostly slender; elongated and often flattened, hence called ‘ribbon worms’ or ‘proboscis worms’ (Fig. 14.31). 2. Most species of Phylum Nemertea are less than 20 cm in length and a few may be several me­tres or more. 3. Phylum Nemertea has un-segmented body.

What kind of food does a Nemertea eat?

The carnivorous marine ribbon worms or nemertines (Phylum Nemertea or Phylum Rhyncocoela) are predators of snails, small crustaceans, mollusks, and polychaetes.

How is the Nemertea related to the flatworm?

Morphological phylogenetic analyses have considered nemerteans to be most closely related with flatworms (phylum Platyhelminthes ). Recent molecular analyses, however, suggest Nemertea belongs to superphylum Lophotrochozoa, as do annelids, molluscs, and several other smaller phyla.

What kind of proboscis does a nemertea have?

Nemeteans have eversible proboscis situated in rhynchocoel. Ne­merteans range in length from a few mil­lime­ters to 30 me­ters (stretched) in length (most com­monly 20 cm or less) and may be drab or very brightly col­ored.