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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Discocriconemella

Discocriconemella DeGrisse & Loof, 1965 (ref. ID; 5832)

Synonym Acrozostron Orton Williams, 1981 (ref. ID; 5832)

ref. ID; 5832

Diagnosis (emended)

Female body 0.20-0.43 mm. Annules 65-174, smooth or crenate retrorse. Anastomoses may be present. Labial annule discoid, set off from body. Submedian lobes absent or present. Sylet 37-113 µm, rigid, or flexible in species with stylet more than 65 µm. Vulva open or closed. Tail 6-17 annules, conical rounded VL/VB 0.7-1.7. (ref. ID; 5832)
  • Juvenile female (Fourth stage): Annules crenate. (ref. ID; 5832)
  • Male: Lateral incisures two, three, or four, bursa small or absent, head conical or with disc, spicules 15-24 µm. (ref. ID; 5832)

    Notes

    The genus Acrozostron is considered herein as a synonym of Discocriconemella. Acrozostron was stated to differ from Discocriconemella by the large amphid apertures, Discocriconemella having small amphids. Acrozostron pannosa, A. hengsungica, and A. macramphidia as described by Luc (1970) and Sauer and Winoto (1975) respectively have small apertures. DeGrisse (1977) showed that D. limitanea, the type species of Discocriconemella, also has large amphid apertures. Acrozostron was also stated to have hyaline areas around the head but these are absent in A. pannosa and A. macramphidia and were not mentioned in A. hengsungica by Choi and Geraert (1975). Amphid aperture size and the hyaline nature of the head clearly overlaps between both genera and are of little taxonomic value. Stylet rigidity or flexibility and stylet length is also insufficient for separation of Acrozostron from Discocriconemella due to overlap of the characters between the two genera. The head disc structure of Acrozostron species does form a species group, but this group should be considered within Discocriconemella and not as generically distinct. Discocriconemella barberi cannot be distinguished from D. limitanea (see Loof and Sharma 1980) on the basis of stylet length, number of annules, vulva position, and other characters and is therefore synonymized with D. limitanea. (ref. ID; 5832)

    Type species

    Discocriconemella limitanea (Luc, 1959) DeGrisse & Loof, 1965 (ref. ID; 5832)
    1. Discocriconemella baforti DeGrisse, 1967 (ref. ID; 5832)
    2. Discocriconemella barberi Chawla & Samathanam, 1980
      See; Discocriconemella limitanea (ref. ID; 5832)
    3. Discocriconemella caudaventer Orton Williams, 1979 (ref. ID; 5832)
    4. Discocriconemella colbrani (Luc, 1970) Loof & DeGrisse, 1973 (ref. ID; 5832)
    5. Discocriconemella degrissei Loof & Sharma, 1980 (ref. ID; 5832)
    6. Discocriconemella discolabia (Diab & Jenkins, 1966) DeGrisse, 1967 (ref. ID; 5832)
    7. Discocriconemella glabrannulata DeGrisse, 1967 (ref. ID; 5832)
    8. Discocriconemella hengsungica Choi & Geraert, 1975 (ref. ID; 5832)
    9. Discocriconemella lamottei (Luc, 1959) n. comb (ref. ID; 5832)
      Syn; Criconemoides lamottei Luc, 1970 (ref. ID; 5832)
    10. Discocriconemella limitanea (Luc, 1959) DeGrisse & Loof, 1965 (ref. ID; 5832)
      Syn; Discocriconemella barberi Chawla & Samathanam, 1980 (ref. ID; 5832)
    11. Discocriconemella macramphidia DeGrisse, 1967 (ref. ID; 5832)
    12. Discocriconemella mauritiensis (Williams, 1960) DeGrisse & Loof, 1965 (ref. ID; 5832)
    13. Discocriconemella pannosa Sauer & Winoto, 1975 (ref. ID; 5832)
    14. Discocriconemella recensi Khan et al., 1971 (ref. ID; 5832)
    15. Discocriconemella repleta Pinochet & raski, 1976 (ref. ID; 5832)
    16. Discocriconemella retroversa Sauer & Winoto, 1975 (ref. ID; 5832)
    17. Discocriconemella theobromi (Chawla & Samathanam, 1980) n. comb. (ref. ID; 5832)
      Syn; Madinema theobromi Chawla & Samathanam, 1980 (ref. ID; 5832)