New contributions to the marine benthic ciliates from the Antarctic area, including description of seven new species (Protozoa, Ciliophora) Author Wilbert, Norbert Author Song, Weibo text Journal of Natural History 2005 2005-04-30 39 13 935 973 http://dx.doi.org/10.1080/00222930400001509 journal article 10.1080/00222930400001509 1464-5262 4657793 Philasterides cf. armatalis Song, 2000 ( Figure 1C ) Only a few cells found in two protargol-impregnated slides, so that it can be described only at infraciliature level. According to the oral structure and general somatic infraciliature, it seems to be an undescribed member of the genus Philasterides . However, it has to be treated as an unknown species until further information is obtained. Description Cells about 40620 M m long after protargol impregnation; body shape long oval to slender, circular in cross-section; apical end widely pointed with small apical plate surrounded by somatic kineties ( Figure 1C , arrowhead); posterior end generally rounded. Ventral surface slightly indented around buccal area, dorsally convex. Buccal field about 50% of cell length. One large oval macronucleus centrally located, 12616 M m in size; position of micronucleus uncertain, possibly adjacent to macronucleus. About 22 somatic kineties longitudinally arranged, extending over entire length of body and mainly composed of dikinetids throughout. Each row with about 28 (paired or single) basal bodies. Buccal apparatus consisting of three well-developed membranelles (M1–3) and one short paroral membrane which extends anteriorly to about the middle of membranelle 2. Membranelle 1 (M1) long and consisting of about 11 transverse rows of kinetosomes; membranelle 2 (M2) about half as long as M1 with ca five rows; membranelle 3 (M3) smaller, close to M2 with only three transverse rows. Paroral membrane likely not bipartite (? impossible to detect since cells lying on side). Scutica (Sc) with several pairs of basal bodies, sparsely arranged, posterior to cytostome ( Figure 1C , double-arrowheads). Remarks This organism differs from the marine form P. armatalis Song, 2000 in structure of scutica, buccal apparatus, smaller body size and lower in having fewer ciliary rows (see Song 2000).