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Types of Nematodes

Adenophorea​
Adenophorea​

Primarily free-living marine, freshwater, and terrestrial nematodes; considered to be the most primitive form of nematodes Evolution and systematics Nematoda, the phylum above the class Adenophorea, have left very few fossil remains.

Ascaridida​
Ascaridida​

ASCARIDIDA. The ascaridida is an order of nematodes that includes Toxocara cati which is one of the most common parasites of the cat around the world. The ascarids are characterized by being cream-colored, robust, and relatively long as nematodes go, being one to several inches in length.

source: aavp.org
Enoplea​
Enoplea​

Enoplea (enopleans) is a class, which with the classes Secernentea and Chromadorea make up the phylum Nematoda in current taxonomy. The Enoplea are considered to be a more ancestral group than the Chromadorea, and researchers have referred to its members as the "ancestrally diverged nematodes", compared to the "more recently diverged nematodes" of Chromadorea.

Secernentea​
Secernentea​

Secernentea Secernentea was a class of nematodes in the Classical Phylogeny System (Chitwood, 1958) and is no longer in use [2, 3]. This morphological-based classification system has been replaced by the Modern Phylogeny system, where taxonomy assignment is based on small subunit ribosomal DNA (SSU rDNA) [4, 5].