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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ogma

Ogma Southern, 1914 (ref. ID; 5848)

Family Criconematidae (ref. ID; 6182)

Synonym Variasquamata (Mehta & Raski, 1971) Khan et al., 1976 (ref. ID; 5848)

ref. ID; 5848

Diagnosis (emended)

Female body 0.27-0.57 mm. Annules 59-88, retrorse with 8-18 longitudinal rows of round, undivided scales at mid-body. Head annules two, set off, smooth or crenate. Lip region elevated, truncate to broadly rounded. Stylet 48-116 µm. Vulval lips conical. Tail 11-19 annules, conical pointed, VL/VB 1.1-2.3. (ref. ID; 5848)
  • Juveniles (fourth stage): Cuticle with 10-15 longitudinal rows of rounded scales with refractive tip elements. Males with stylet. (ref. ID; 5848)
  • Males: Lateral incisures three, bursa absent, spicules 28-30 µm. (ref. ID; 5848)

    Type species

    Ogma murrayi Southern, 1914 (ref. ID; 5848)

    Nominal species

    Ogma coffeae (Edward et al., 1970) Andrassy, 1979 (ref. ID; 5848)
    1. Ogma coffeae (Edward et al., 1970) Andrassy, 1979 (ref. ID; 5848)
      Syn; Ogma gracile (Mehta & Raski, 1971) Andrassy, 1979 (ref. ID; 5848)
    2. Ogma decalineatum (Chitwood, 1957) Andrassy, 1979 (ref. ID; 5848)
    3. Ogma duodevigintilineatum (Andrassy, 1968) Andrassy, 1979 (ref. ID; 5848)
    4. Ogma fotedari (Mahajan & Bijral, 1973) Andrassy, 1979 (ref. ID; 5848)
    5. Ogma gracile (Mehta & Raski, 1971) Andrassy, 1979
      See; Ogma coffeae (ref. ID; 5848)
    6. Ogma lentiforme Schuurmans-Stekhoven & Teunisson, 1938 (ref. ID; 5848)
    7. Ogma murrayi Southern, 1914 (ref. ID; 5848)
    8. Ogma octangulare (Cobb, 1914) Schuurmans-Stekhoven & Teunisson, 1938 (ref. ID; 5848)
    9. Ogma rhombosquamatum (Mehta & Raski, 1971) Andrassy, 1979 (ref. ID; 5848)
    10. Ogma rhosimium (Khan et al., 1976) Andrassy, 1979
      See; Ogma simlaensis (ref. ID; 5848)
    11. Ogma simlaensis (Jairajpuri, 1963) Andrassy, 1979 (ref. ID; 5848)
      Syn; Ogma rhosimium (Khan et al., 1976) Andrassy, 1979 (ref. ID; 5848)
    12. Ogma spinosum Andrassy, 1979 (ref. ID; 5848)
    13. Ogma squamiferum (Heys, 1970) Andrassy, 1979 (ref. ID; 5848)
    14. Ogma zernovi Kirjanova, 1948 (ref. ID; 5848)

    Ogma gracile (Mehta & Raski, 1971) Andrassy, 1979

    See

    Ogma coffeae (ref. ID; 5848)

    Notes

    Ogma gracile cannot be separated satisfactorily from O. coffeae by stylet length (58-79 vs. 58-68 µm), number of annules (78-88 vs. 75-85), vulva position (annules 11-14) or the number of scale rows (10 vs. 8-10). Scale shape, head, tail, and vulva structure all appear to be similar. Ogma gracile, therefore is synonymized with O. coffeae. Examination of O. gracile specimens indicated that the terminus is not a single elongate conical annule as depicted by Mehta and Raski (1971) but is composed of three or four smaller annules, similar to that illustrated for O. coffeae by Edward et al. (1970). (ref. ID; 5848)

    Ogma rhosimium (Khan et al., 1976) Andrassy, 1979

    See

    Ogma simlaensis (ref. ID; 5848)

    Notes

    Ogma rhosimium was stated to differ from O. simlaensis by the presence of submedian lobes (stated as absent in O. simlaensis) and by vulva and anus position. Original illustrations of both species show the presence of four submedian lobes. The vulva and anus in O. rhosimium are on annules 11-13 and 9 respectively and not on annules 9 and 4 as stated by Khan et al. (1976). Based on stylet length (59-65 vs. 60-65 µm) number of annules (67-72 vs. 68) vulva position (annules 11-13 vs. 13-16), 10 scale rows, and the shape of the head, tail, and scales, these species are not sufficiently different to justify specific separation and, therefore, O. rhosimium is synonymized with O. simlaensis. (ref. ID; 5848)