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Nematodes are very small, slender worms. Most are free-living, often less than 2.5 mm long and some only about 1 mm. Many nematodes are microscopic. Some soil nematodes can reach up to 7 mm in length, and some marine species can reach up to 5 cm. Some are parasitic and can reach lengths of 50 cm or more. [42]
Worms vary in size from microscopic to over 1 metre (3.3 ft) in length for marine polychaete worms (bristle worms); [1] 6.7 metres (22 ft) for the African giant earthworm, Microchaetus rappi; [2] and 58 metres (190 ft) for the marine nemertean worm (bootlace worm), Lineus longissimus. [3]
Caenorhabditis elegans (/ ˌ s iː n oʊ r æ b ˈ d aɪ t ə s ˈ ɛ l ə ɡ æ n s / [6]) is a free-living transparent nematode about 1 mm in length that lives in temperate soil environments. [7]
Bipalium species are predatory.Some species prey on earthworms, while others may also feed on mollusks. [10] [11] These flatworms can track their prey. [12]When captured, earthworms begin to react to the attack, but the flatworm uses the muscles in its body, as well as sticky secretions, to attach itself to the earthworm to prevent escape.
parasitic worm: ranges from a few millimeters up to 65 centimetres (26 in) Annelida: phylum: segmented worms: ranges from microscopic to 3 metres (9.8 ft) Aplacophora: Sub-phylum: molluscs that look like worms: a few millimeters to several centimeters Chaetognatha: phylum: arrow worms: 2 to 120 millimetres (0.079 to 4.724 in) Cycliophora: phylum
Adult worms resemble typical nematode roundworms. Long and threadlike, B. malayi and other nematode possess only longitudinal muscles and move in an S-shape motion. [8] Adults are typically smaller than adult W. bancrofti, though few adults have been isolated. Female adult worms (50 mm) are larger than male worms (25 mm). [9]
Taenia solium, the pork tapeworm, belongs to the cyclophyllid cestode family Taeniidae.It is found throughout the world and is most common in countries where pork is eaten. . It is a tapeworm that uses humans (Homo sapiens) as its definitive host and pigs (family Suidae) as the intermediate or secondary hos
D. dipsaci is a microscopic worm about 1.5 mm long. It penetrates plants from either the soil or infested planting material and occasionally from seeds. They live between the cells of onion or garlic leaves and between the scales of the bulbs where they feed on cell sap and multiply.