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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Cymatocylis

  1. Cymatocylis affinis Laackmann, 1910 (ref. ID; 7221) reported author and year? (ref. ID; 7039)
  2. Cymatocylis brevicaudata Laackmann, 1909 (ref. ID; 3544)
    Syn; Cymatocylis brevicaudata Kofoid & Campbell, 1929 (ref. ID; 3544); Cymatocylis calyciformis f. brevicaudata Laackmann, 1909 (ref. ID; 3544)
  3. Cymatocylis calyciformis (Laackmann) (ref. ID; 3544, 7039)
  4. Cymatocylis calyciformis f. brevicaudata Laackmann, 1909
    See; Cymatocylis brevicaudata Laackmann, 1909 (ref. ID; 3544)
  5. Cymatocylis calyx (ref. ID; 7039)
  6. Cymatocylis convallaria Laackmann, 1910 (ref. ID; 7221) reported author and year? (ref. ID; 7039)
  7. Cymatocylis cristallina Laackmann, 1909 (ref. ID; 3544)
    Syn; Cymatocylis subconica Kofoid & Campbell, 1929 (ref. ID; 3544)
  8. Cymatocylis drygalskii (ref. ID; 7039)
  9. Cymatocylis gaussi (ref. ID; 7221)
  10. Cymatocylis kerguelensis Laackmann, 1909 (ref. ID; 3544, 7039)
  11. Cymatocylis nobilis (ref. ID; 7039)
  12. Cymatocylis parva (Laackmann, 1909) (ref. ID; 3544, 7039)
  13. Cymatocylis scyphus (ref. ID; 7221)
  14. Cymatocylis subconica Kofoid & Campbell, 1929
    See; Cymatocylis cristallina Laackmann, 1909 (ref. ID; 3544)
  15. Cymatocylis urnula (ref. ID; 7221)
  16. Cymatocylis vanhoffeni (ref. ID; 7039)

Cymatocylis affinis Laackmann, 1910 (ref. ID; 7221) reported author and year? (ref. ID; 7039)

Notes

Cymatocylis affinis and C. convallaria are considered as two forms of one species and are described as C. affinis/convallaria (Boltovskoy et al., 1990). The basic difference between the two forms of C. affinis/convallaria is in the morphology of the aboral horn of the lorica. In C. affinis/convallaria, forma convallaria, it is short and conical, while in C. affinis/convallaria, forma affinis, it is elongated and terminally furrowed with a distinct 'tail'. (ref. ID; 7039)
Cymatocylis affinis and C. convallaria were erected by Laackmann in 1910 on the basis of small differences in the oral rim, overall shape, apical horn and surface smoothness (both were described as having furrowing or ridges on the distal part of the lorica). This author further subdivided C. affinis into four formae (typica, ventricosa, cylindrica and urnula) with but very minor morphological differences. Kofoid and Campbell (1929) rather indiscriminately (albeit, according to their remak, 'provisionally') raised all these forms to the rank of species (forma typica as C. affinis; f. ventricosa as C. gaussi; f. cylindrica as C. scyphus; and f. urnula as C. urnula). Subsequent authors followed chiefly Kofoid and Campbell's classification, although many had difficulty when trying to identify these closely related 'species' (e.g. Balech 1958, 1962; Spoel 1986; Barria de Cao 1987) and sometimes clumped them together in counts (Boltovskoy et al. 1989). (ref. ID; 7221)

Cymatocylis brevicaudata Laackmann, 1909 (ref. ID; 3544)

Synonym

Cymatocylis brevicaudata Kofoid & Campbell, 1929 (ref. ID; 3544); Cymatocylis calyciformis f. brevicaudata Laackmann, 1909 (ref. ID; 3544)

Descriptions

The lorica is stout goblet-shaped, and has a denticulate oral rim with an inverted flare and a conical aboral horn with slight spiral ridges. The surface of the bowl is usually smooth. (ref. ID; 3544)

Measurements

Length 150; oral diameter 85; length of a horn 55 um. (ref. ID; 3544)

Cymatocylis calyciformis (Laackmann) (ref. ID; 3544, 7039)

Descriptions

The lorica is elongate, having a slender long aboral horn. The oral end is provided with an expanding anterior band, a minutely denticulate oral rim and a slight striation composed of short parallel striae between them. The surface of the bowl is generally smooth without any ornamentation. (ref. ID; 3544)

Measurements

Length 260-390; oral diameter 130-115; length of a horn 130-270 um. (ref. ID; 3544)

Cymatocylis convallaria Laackmann, 1910 (ref. ID; 7221) reported author and year? (ref. ID; 7039)

Notes

See the description of C. affinis. (ref. ID; 7221)

Cymatocylis cristallina Laackmann, 1909 (ref. ID; 3544)

Synonym

Cymatocylis subconica Kofoid & Campbell, 1929 (ref. ID; 3544)

Descriptions

The lorica is tall bell-shaped without an aboral horn. The oral end has a minutely denticulate rim and a slight flare with short striae on the surface. The bowl tapers gradually in the main part, while rapidly to an aboral point in the posterior region, and has a somewhat smooth surface. (ref. ID; 3544)

Measurements

Length 253; oral diameter 107 um. (ref. ID; 3544)

Cymatocylis kerguelensis Laackmann, 1909 (ref. ID; 3544, 7039)

Descriptions

The lorica is rather small sac-shaped and has an oral flare with double rims making a shallow circular groove, of which the inner one is minutely denticulate. On the surface of the bowl are many lines composed of slight short striae. (ref. ID; 3544)

Measurements

Length 62; breadth 50 um. (ref. ID; 3544)

Cymatocylis parva (Laackmann, 1909) (ref. ID; 3544, 7039)

Descriptions

The lorica is more or less small bell-shaped and consists of a short collar with a backward flare and of a slightly inflated conical bowl with a minute distal cone. The oral rim is not denticulate, and the surface of the bowl is smooth. (ref. ID; 3544)

Comments

The oral rim of the specimen studied does not have a minute dentation, though the original specimen recorded by Laackmann (1909) is provided with a fine dentation. In Balech's report (1958), however, those with or without an oral dentation have been mixed. Therefore, the presence or absence of the oral dentation cannot serve as a criterion for specific determination. (ref. ID; 3544)

Measurements

Length 75; oral diameter 53 um. (ref. ID; 3544)