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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Lanceimermis

Lanceimermis Artyukhovsky, 1969 (ref. ID; 1770)

Family Mermithidae (ref. ID; 1770)

ref. ID; 1770

Diagnosis

Head set off from body, cephalic papillae six, amphids large, posterior to level of cephalic papillae. Mouth opening terminal, Vagina S shaped, vulva flap present, eggs medium sized, many. Tail terminus acutely to bluntly rounded in both sexes. Male with J-shaped spicule, shaft sculptured. Genital papillae in three rows, numerous. (ref. ID; 1770)

Notes

Rubtsov (1974) lists 11 species of Lanceimermis which he considered as belonging to this subgenus, viz. Gastromermis (Lanceimermis) austriaca (Micol.); G. (L.) cephalomyremecida (Steiner); G. (L.) distoicha (Steiner); G. (L.) euvaginata (Steiner); G. (L.) lanceicapita Rubtsov; G. (L.) phreatica (Coman); G. (L.) prolata (Coman); G. (L.) serbani (Coman); G. (L.) trachelata (Steiner); G. (L.) unica Rubtsov; and G. (L.) zschkokkei (Schmassmann). Nickle (1972) considered Lanceimermis as designated by Artyukhovsky (1969) a valid genus. The diagnostic vulval flap of the female and the characteristically shaped spicule of the male supports strongly the basis for Lanceimermis as a valid genus. (ref. ID; 1770)

Type species

Lanceimermis prolata (Coman, 1961) Artyukhovsky, 1969 (ref. ID; 1770)
  1. Lanceimermis prolata (Coman, 1961) Artyukhovsky, 1969 (ref. ID; 1770)
  2. Lanceimermis schlitzensis n. sp. (ref. ID; 1760 original paper)

Lanceimermis prolata (Coman, 1961) Artyukhovsky, 1969 (ref. ID; 1770)

Descriptions

  • Male: Head rounded mouth opening terminal, vestibulum strongly developed. Amphid aperture well posterior to level of cephalid papillae, walls of pouch thick. Spicule J-shaped, shaft sculptured. Spicule head expanded, shaft of uniform thickness to bluntly rounded tip. Genital papillae with inner ducts, closely spaced and nearly extending to tail terminus. Tail conoid with acutely rounded terminus. (ref. ID; 1770)
  • Female: Head angular, mouth opening terminal, vestibulum well developed. Amphid aperture posterior to level of cephalic papillae, walls of pouch thick. Vulva flap well developed, vagina S shaped. Eggs medium sized, in single row or in two or three in mature female. Tail conoid with acutely rounded terminus. (ref. ID; 1770)

    Measurements

  • Male: Body length 10.9(10-15) mm; body width 95(90-100) µm; head width 44(40-50) µm; amphid aperture 6-7 µm; amphid pouch 10-13x15-18 µm; spicule length 175(160-190) µm; spicule head width 13.0(12-15) µm; spicule midshaft width 9.5(9-10) µm; tail length 170(135-230) µm; midbody cuticle width 6-8 µm. (ref. ID; 1770)
  • Female: Body length 12.2(10-15) mm; body width 139(130-145) µm; head width 48-55 µm; amphid aperture 5-6 µm; amphid pouch 6-9x10-13 µm; eggs 55-65x45-60 µm; midbody cuticle width 6-8 µm. (ref. ID; 1770)