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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Coniculostomum

Coniculostomum Njine, 1979 (ref. ID; 4894)

Family Oxytrichidae Ehrenberg, 1838: Subfamily Stylonychinae Berger & Foissner, 1997 (ref. ID; 4894 subfamily original paper)

Synonym Laurentiella (Laurosticha) Jankowski, 1979 (type species by original designation: Laurentia monilata Dragesco & Njine, 1971) (ref. ID; 4894)

[ref. ID; 2129]
Coniculostomum usually also included in the Oxytrichidae, develops, unlike Onychodromopsis, only a single right marginal primordium and retains most of the parental marginal and some dorsal kineties. Based upon the mode of marginal row formation, Eigner (1995) transferred Coniculostomum to Kahliellidae. (ref. ID; 2129)

[ref. ID; 4894]
Improved characterization; Undulating membranes in Stylonychia pattern. Two or more right and one or more left marginal rows, distinctly separate posteriorly. More than six dorsal kineties. Caudal cirri present and usually distinctly elongated. Primordium II of the proter originates from oral primordium. Primordia V and VI of the proter and primordium IV of the opisthe originate from postoral ventral cirrus V/4. Parental marginal cirri partially retained after division. Dorsal morphogenesis in Coniculostomum pattern. (ref. ID; 4894)
Remarks; The subgenus Laurosticha Jankowski, 1979 was published in the same year as Coniculostomum which prevailed. The oxytrichid lineage of this peculiar genus was recognized only recently by detailed morphogenetic studies (Kamra & Sapra 1990; Kamra et al. 1994) showing several conspicuous synapomorphies with the Stylonychia mytilus-complex. Thus, a classification within the kahliellids (Eigner 1995), based solely on the retention of parental marginal rows and dorsal kineties, is very likely artificial. (ref. ID; 4894)
Type species (by monotypy); Laurentia monilata Dragesco & Njine, 1971 (ref. ID; 4894)
  1. Coniculostomum monilata (Dragesco & Njine, 1971) Njine, 1979 (ref. ID; 4253, 4894, 7423, 7538 redescribed paper) reported author and year? (ref. ID; 191)
    Syn; Laurentia monilata Dragesco & Njine, 1971 (ref. ID; 4894, 7423)

Coniculostomum monilata (Dragesco & Njine, 1971) Njine, 1979 (ref. ID; 4253, 4894, 7423, 7538 redescribed paper) reported author and year? (ref. ID; 191)

Synonym

Laurentia monilata Dragesco & Njine, 1971 (ref. ID; 4894, 7423)

Descriptions

See description of Pleurotricha indica. (ref. ID; 4253)

Remarks

The N1 anlage generates also the row four, obviously by participation of the first and second cirrus of the old row four. There are several rows old cirri on ventral and old cilia on dorsal side, which are products of neokinetal waves. Usually four cirri develop in each of the two rightmost ventral rows. (ref. ID; 7423)