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Unlike the flatworms, nematodes have a tubular digestive system, with openings at both ends. Like tardigrades, they have a reduced number of Hox genes , but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum.
This nematode is a multicellular parasite that lives within a single muscle cell, which it extensively modifies according to its own requirements. [4] T. spiralis larvae within the diaphragm muscle of a pig. Nurse cell formation in skeletal muscle tissue is mediated by the hypoxic environment surrounding the new vessel formation. [5]
Trichinella is the genus of parasitic roundworms of the phylum Nematoda that cause trichinosis (also known as trichinellosis). Members of this genus are often called trichinella or trichina worms. A characteristic of Nematoda is the one-way digestive tract, with a pseudocoelom (body cavity made up of only an ectoderm and endoderm).
Nematoida is a clade of pseudocoelomate free living or parasitic animals.It consists of phyla Nematoda and Nematomorpha. [3] [4] The two groups share a number of features in common; the presence of a cloaca in both sexes, aflagellate sperm, and a cuticle made of collagen.
The stichosome is composed by very visible cells in Trichosomoides crassicauda. A stichosome (from Greek stichos (στίχος) = row; soma (σῶμα) = body) is a multicellular organ that is very prominent in some species of nematodes and consists of a longitudinal series of glandular unicellular cells (stichocytes) arranged in a row along the oesophagus that forms the posterior esophageal ...
Spicule (sponge), small skeletal elements of sea sponges; Spicule (nematode), reproductive structures found in male nematodes (roundworms) Spicule (solar physics), jets of solar material from the Sun; Spicule (glass manufacture), glass flakes formed in the production of glass vials.
While the majority of the soft-bodied animals typically don't have any kind of skeleton, some do, mainly in the form of stiff cuticles (roundworms, water bears) or hydrostatic skeletons (annelids). [5] While lack of a skeleton typically restricts the body size of soft-bodied animals on land, marine representatives can grow to very large sizes.
The term ‘alae’ is the plural of ala (wing), describing either one of the pair of ridges that forms on a nematode or an individual crease found on an individual ridge. The term ‘ala’ is rarely used in describing the alae and scientific journals use the term ‘alae’ both singularly and in the plural.