Annelida

Phylum Annelida (Leeches and Worms) 
Courtesy of the Cacapon InstituteBody is soft, muscular and cylindrical in shape; body consists of many similar, round ring-like segments arranged in rows; numerous segments along the entire length, number often depends upon the order or family.  Leeches have distinct suckers situated on the bottom of the body, one at the front and one at the rear.  All invertebrates within this category have a high tolerance to insults. 

Leeches

1.

Hirudinea (Leech): Body dorsally flattened with 34 segments, which are divided so there appears to be more; suction disks present on one or both ends; eyespots may be present. Crawler/burrower; Predator/parasite; S-VL (S/F)

Worms

2.

Oligochaeta (Aquatic worm): Body elongated (worm-like); divided into many segments most having bundles of small hairs; no eyespots or suckers present. Aquatic earthworms are common in riffles; however wetlands have a much wider variety from this group (i.e. Naidid worms, Tubiflex worms etc.)  Crawler/burrower; Collector/gatherer; VS-VL (F/S)

3.

Nematoda (Round worm): Worm-like; no segmentation; body usually translucent or having a pale coloration. Crawler/burrower; Collector/gatherer; VS-M (S)

4.

Nematomorpha (Horsehair worm): Body very long and slender; no segments. Burrower; Parasite/predator; VL (S)

 

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