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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Hemifridericia

Family Enchytraeidae (ref. ID; 6650)

Family Enchytraeidae: Subfamily Achaetinae (ref. ID; 5790)
  1. Hemifridericia parva Nielsen & Christensen, 1959 (ref. ID; 6650) reported author and year? (ref. ID; 5790)

Hemifridericia parva Nielsen & Christensen, 1959 (ref. ID; 6650) reported author and year? (ref. ID; 5790)

Descriptions

Length 1.6 mm (fixed), 2 mm (living); segments 21-22. Dorsal chaetae 2 per bundle; ventral chaetae 3 per bundle (2 in II) in the anteclitellar, 2 per bundle postclitellar. Clitellum over XII-1/2XIII; gland cells oval and transversely arranged; chaetae present in XII. Posterior brain deeply incised. No septal glands unite dorsally; secondary glands one pair in IV. Dorsal vessel originating in XII-XIII. Nephridia from 6/7 onwards with efferent duct terminal. Coelomocytes of two types. Sperm funnels pear-shaped, 1.5 times as long as width, with inconspicuous collar. No seminal vesicles. Spermathecae small, connecting jointly with oesophagus. (ref. ID; 6650)

Remarks

The specimens from the type locality (Denmark) were described as possessing 2 chaetae per bundle ventrally in XI (Nielsen & Christensen 1959), whereas our specimens have 3 in the same position. The presence of secodary septal glands in IV was not mentioned in the original description. (ref. ID; 6650)

Material examined

Three species from T6. (ref. ID; 6650)