No common name

Proteocephalus longicollis

ORDER

Proteocephalidea FAMILY

Proteocephalidae TAXONOMY

Alyselmintus longicollis Zeder, 1800, type locality unknown.

OTHER COMMON NAMES None known.

PHYSICAL CHARACTERISTICS

Body up to 8.7 in (220 mm) long and about 0.06-0.08 in (1.5-2 mm) wide. Scolex small (diameter up to 0.016 in [0.4 mm]), provided with small suckers and small sucker-like apical organ. Gravid proglottides up to 0.06-0.08 in (1.5-2 mm) long. Genital pores on the lateral margins of proglottides, irregularly alternating.

DISTRIBUTION Eurasia and North America.

HABITAT

The microhabitats are the intestines of freshwater fishes (Salmonidae, Coregonidae, and Osmeridae, sometimes in others). This species inhabits lakes and rivers in the Northern Hemisphere.

FEEDING ECOLOGY AND DIET

Internal parasite absorbing nutrients through the tegument.

BEHAVIOR

Nothing is known.

REPRODUCTIVE BIOLOGY

This species is hermaphroditic. Eggs released in water are eaten by copepods, which are intermediate hosts. The infective larva develops in the body cavity of the crustacean. The fishes become infected by eating copepods containing cestode larvae.

CONSERVATION STATUS Not listed by the IUCN.

SIGNIFICANCE TO HUMANS

Parasitic in fishes, including in those in fish farms. No data of economic significance. ♦

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