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8.9. Nematodes

Phylum nematodes

Nematodes or nematodes are also known as "roundworms" or "cylindrical worms" due to the shape of their body in cross section. They are not segmented.

Dentro de los "gusanos" se incluyen los anélidos, los nematodos y los platelmintos

They have a digestive tube, with a mouth and anus.

They are predominantly aquatic, but also thrive in moist terrestrial environments.

Some nematodes are free-living, but many are parasitic, such as roundwormswhipworm,  and filariae. They feed on the blood or other fluids of the host.

They reproduce by both parthenogenesis and sexual reproduction. The females deposit the eggs in the host and leave with the feces, from where they pass to other animals through the digestive tract.

The whipworm, roundworms, or anisakis are examples of nematodes.

Anisakis sobre arenques

By Anilocra [Public domain], via Wikimedia Commons

Curiosity: Nemertines

The Nemertine Phylum is a group of marine worms (ribbon worms), intermediate between annelids and flatworms, quite strange. The most striking thing is that they capture their prey by launching a tongue similar to a trunk. A sticky slime comes out that allows it to hunt down its prey.