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Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of about 1300 known species. [ 2 ] [ 3 ] Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies.
It is the only known species of fresh water Nemertea in Australia. [9] It is rarely found in the United States. [3] But in the state of Connecticut it lives in freshwater habitats. Here it usually lives among algae, plants, or detritus. It is more numerous during the Fall season. [6]
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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. [3] Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species ...
The largest animal phylum is also included within invertebrates: the Arthropoda, including insects, spiders, crabs, and their kin. All these organisms have a body divided into repeating segments, typically with paired appendages. In addition, they possess a hardened exoskeleton that is periodically shed during growth. [44]
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Parborlasia corrugatus is a proboscis worm in the family Lineidae. [1] It was formerly placed in family Cerebratulidae.This species of proboscis or ribbon worm can grow to 2 metres (6 ft 7 in) in length, and lives in marine environments down to 3,590 metres (11,780 ft).
Some plants have bracts that subtend the inflorescence, where the flowers are on branched stalks; the bracts are not connected to the stalks holding the flowers, but are adnate or attached to the main stem (Adnate describes the fusing together of different unrelated parts. When the parts fused together are the same, they are connately joined.)