Setonophrys nivalis ( Kane, 1969 )

Clamp, John C. & Kane, John R., 2003, Redescription of Four Species of Lagenophryid Peritrichs (Ciliophora) from Australia and New Guinea, With Descriptions of Two New Species, Records of the Australian Museum 55 (2), pp. 153-168 : 162-163

Setonophrys nivalis ( Kane, 1969)

Fig. 16 ; Table 8

Lagenophrys nivalis Kane, 1969: 369 .

Circolagenophrys nivalis .– Jankowski, 1986: 87.

Setonophrys nivalis .– Clamp, 1991: 360.

Redescription. Lorica hemispheroidal, suboval in dorsal view, moderately longer than wide. Lorica symmetrical in dorsal view. Rim of lorica heavily thickened at posterior, diminishing to moderately thickened at anterior. Lips of lorica aperture tall, with vertical sides, creating almost tubular aperture. Short to moderately long spine on each side of anterior lip, originating slightly below edge of anterior lip and projecting almost directly laterad. Anterior lip thick-walled, with straight, symmetrical edge. Posterior lip thin-walled, without spines or other projections, with straight, symmetrical edge.

Macronucleus elongate, cylindroid, located in approximate centre of body. Medial portion of macronucleus slender, straight or slightly curved, usually slanting posteriad from left to right at slight angle to transverse axis of body, infrequently parallel to transverse axis of body. Ends of macronucleus thicker than medial portion; right end always curved sharply anteriad away from medial portion, left end usually curved sharply anteriad away from medial portion but sometimes extending straight out from medial portion. Micronucleus ovoid, located near right end of macronucleus.

Etymology. The specific name (Latin: snowy) refers to the montane habitat of the host.

from the type locality and host (n=15).

Type material. LECTOTYPE, AUSTRALIA, Victoria, Mt Baw Baw (1850 m elevation); 13 Oct 1963, J. R. Kane; on Colubotelson searlei Nicholls, 1944 , pereiopods and dorsum . Lectotype slide with lectotype organism marked by inscribed circle (Erlich’s hematoxylin), AM P62819 . PARALECTOTYPE slides (Erlich’s hematoxylin), AM P62820, P62884, P62885, and IPTC USNM 1004292 (the latter comprises 3 slides) .

Remarks. Most species of Setonophrys have one or more spines on the anterior lip of the lorica aperture; S. nivalis , however, is distinct from them in regard to the shape, position, and angle of projection of its two spines. Spines tend to be long, are always located on the anterior or anterolateral parts of the anterior lip, and project anteriad in other species of Setonophrys ( Kane, 1965; Clamp, 1991). In addition, these spines tend to be wider at their bases, tapering gradually to a sharp tip. By contrast, the spines of S. nivalis are relatively short, are located on the lateral parts of the anterior lip, project directly laterad, and are quite slender from their bases to their tips ( Fig. 16 ).

Figures

Figs. 16–19.(16) Setonophrys nivalis, Erlich’s hematoxylin preparation. Dorsal view of lectotype individual from the type locality and host, AM P62819. (AL) Anterior lip of lorica aperture; (PL) posterior lip of lorica aperture; see Fig. 1 for explanation of other symbols. The micronucleus is the small, ovoid, darkly stained body located near the right end of the macronucleus. (17–19) Lagenophrys turneri. (17) Dorsal view of lectotype individual from the type locality and host; Erlich’s hematoxylin preparation, AM P62821. The lori ca aperture is partially open. (Cs) Boundary between infundibulum and cytostome (= ampulla); see Figs. 1, 16 for explanation of other symbols. The micronucleus is the small, ovoid, darkly stained body located near the posterior end of the macronucleus. (18) Dorsal view of individual from Papua New Guinea; Heidenhain’s hematoxylin preparation, AM P62822. The lorica aperture is almost closed. (19) Dorsal view of infundibular polykinetids of individual from Papua New Guinea; protargol preparation,AM P62886.The polykinetids are rows of kinetosomes and associated cilia (not shown) that are located on the wall of the infundibulum (Figs. 17, 21, 22). The rows of kinetosomes that constitute the polykinetidal infraciliature normally visible under the light microscope are shown as solid lines for the sake of convenience and clarity. (Ab) abstomal direction (= away from the cytostomal region); (Ad) adstomal direction (= toward the cytostomal region); (P1) polykinetid 1; (P2) polykinetid 2; (P3) polykinetid 3; (Pk) polykinety (the part of P1 that extends out onto the peristomial lip—only the part proximal to the infundibulum is shown); arrow with numerals shows the convention for numbering individual rows within each polykinetid; large arrow, adstomal curvature of P1.