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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Achaeta

Achaeta Levinsen, 1883 (ref. ID; 5971) or Vejdovsky, 1877 (ref. ID; 1257) reported year? (ref. ID; 7265)

Family Enchytraeidae (ref. ID; 1257, 1928, 6650)

Family Enchytraeidae: Subfamily Achaetinae (ref. ID; 5790)
  1. Achaeta aberrans (ref. ID; 5790)
  2. Achaeta affinis (ref. ID; 5790)
  3. Achaeta bibulba Graefe, 1989 (ref. ID; 6653)
  4. Achaeta bohemica Vejdovsky, 1879 (ref. ID; 1257) reported year? (ref. ID; 1928)
  5. Achaeta brevivasa Graefe, 1980 (ref. ID; 6650)
  6. Achaeta bulbosa (ref. ID; 5790)
  7. Achaeta camerani (Cognetti, 1899) (ref. ID; 1257, 6653) reported author and year? (ref. ID; 5790)
  8. Achaeta christenseni (ref. ID; 5790)
  9. Achaeta danica (ref. ID; 5790)
  10. Achaeta dzwilloi Graefe, 1973 (ref. ID; 6664)
  11. Achaeta eiseni Vejdovsky, 1877 (ref. ID; 1257) reported year? (ref. ID; 1928) reported author and year? (ref. ID; 5790)
  12. Achaeta hallensis (ref. ID; 5790)
  13. Achaeta indica Prabhoo, Liang & Xie, 1992 (ref. ID; 6650) reported author and year? (ref. ID; 5790), cf. indica Prabhoo, 1961 (ref. ID; 6650)
  14. Achaeta iridescens (ref. ID; 5790)
  15. Achaeta littoralis (ref. ID; 5790)
  16. Achaeta maorica (ref. ID; 5790)
  17. Achaeta minima Southern (ref. ID; 1928) reported author and year? (ref. ID; 1257)
  18. Achaeta nielseni (ref. ID; 5790)
  19. Achaeta nurmineni (ref. ID; 5790)
  20. Achaeta parva (ref. ID; 5790)
  21. Achaeta piti (ref. ID; 5790)
  22. Achaeta segmentata (ref. ID; 5790)
  23. Achaeta seminalis Kasp. (ref. ID; 6913) reported author and year? (ref. ID; 5790)
  24. Achaeta silvatica (ref. ID; 5790)
  25. Achaeta vesiculata Nielsen & Christensen, 1959 (ref. ID; 6653) reported author and year? (ref. ID; 5790)

Achaeta bohemica (Vejdovsky, 1879) (ref. ID; 1257) reported year? (ref. ID; 1928)

Descriptions

The specimens were all small, 5-6 mm long. (ref. ID; 1928)

Achaeta brevivasa Graefe, 1980 (ref. ID; 6650)

Descriptions

Length 1.4-2 mm (fixed), 2 mm (living); segments 17-25. Head pore small. No chaetal follicles. Clitellum over XII-1/2XIII, with gland cells in transverse rows. Brain about twice as long as width, anterior concave, posterior rounded. Septal glands all united dorsally; one pair of secondary glands behind septum 5/6. Gut dilatation gradual in VII. Oesophageal appendages one pair, confined to V and without internal canal. Dorsal vessel originating in VII. Nephridia from 6/7 onwards with anteseptal parts ca. 1/2 as long as postseptal; efferent ducts terminal. Coelomocytes abundunt and round, with attached filaments; cytoplasm transparent, nuclei 1/4-1/2 of the cell, round or irregular, sometimes absent. Sperm funnels about twice as long as width, with collar slightly narrower than funnel. Vasa deferentia short, confined to XII. Penial bulbs crescent-shaped. No seminal vesicles. Spermathecae dumb-bell-shaped, opening laterally and confined to V, length shorter than body width. Ampullae irregularly oval, with globules on surface and small lumen. (ref. ID; 6650)

Remarks

The morphological characters of our specimens conform quite well to the original description. A. camerani is similar to A. brevivasa but is larger (length 6-10 mm, segments 32-35), possesses two pairs of secondary septal glands in V-VI, a dorsal vessel was originating in VIII, and coelomocytes had larger nuclei (Graefe 1980). (ref. ID; 6650)

Material examined

Ten whole mounts and three live specimens from T3, T5(17.IV.91), T8. (ref. ID; 6650)

Achaeta indica Prabhoo, Liang & Xie, 1992 (ref. ID; 6650) reported author and year? (ref. ID; 5790), cf. indica Prabhoo, 1961 (ref. ID; 6650)

Descriptions

Fixed length 2-3 mm; segments 20-30. No chaetal follicles. Clitellum over XII-XIII; gland cells scarce and small, arranged in transverse rows. Brain 1.5 times as long as wide, anterior end concave, posterior rounded. Septal glands all united dorsally. Oesophageal appendages one pair, confined to V. Gut dilatation sudden in VII. Dorsal vessel originating in VII. Coelomocytes round with numerous granules. Efferent ducts of all nephridia terminal. Sperm funnels 2-4 times as long as wide, with collar slightly narrower than funnel. Seminal vesicle present. Spermathecae opening ventro-laterallly and extending to VII; ampullae oval, ca. 60 µm in length, 26 µm in maximum width; ectal ducts ca. 160 µm long and 8 µm wide, dilated near ectal pore and forming a small spindle-shape lumen. (ref. ID; 6650)

Remarks

Although individuals from the type position (India) were longer (length 7 mm, segments 31-36), and possessed oesophageal appendages extending into VI, the present material agrees with the original description (Prabhoo 1961) in many characters, especially spermathecal morphology. The authors are of the opinion that it should be identified as A. indica for the time being. (ref. ID; 6650)

Material examined

Four whole mounts and two live specimens from T14. (ref. ID; 6650)