Metaurostylopsis rubra Song and Wilbert, 2002

Wilbert, Norbert & Song, Weibo, 2005, New contributions to the marine benthic ciliates from the Antarctic area, including description of seven new species (Protozoa, Ciliophora), Journal of Natural History 39 (13), pp. 935-973 : 960-966

publication ID 10.1080/00222930400001509

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Metaurostylopsis rubra Song and Wilbert, 2002


Metaurostylopsis rubra Song and Wilbert, 2002

( Figures 10D–G View Figure 10 , 15A–I, N View Figure 15 )

The current population matches the original description very well. We thus supply here only some information derived from recent observation of its morphological features and the morphogenetic process.


Body often more oval than originally reported, size in vivo about 150650 M m. Eight left and six right marginal rows on average; adoral zone about one-third of body length with 45 membranelles; about 12 pairs of cirri in midventral rows, single ventral row extending to about posterior third of cell length with ca 13 cirri; ca 10 fronto-terminal, one buccal, four frontal and five transverse cirri ( Figures 10D View Figure 10 , 15E, F, I View Figure 15 ). Constantly three dorsal kineties, no caudal cirri.

On the basis of the morphogenetic stages obtained from the present population, formation of the ciliature in Metaurostylopsis rubra can be summarized as follows: (1) The parental oral apparatus is entirely renewed by the proter’s oral primordium. (2) Two sets of fronto-ventral-transverse cirral anlagen give rise to the buccal, fronto-terminal, transverse and anterior most frontal cirri, as well as to the ventral and the midventral rows in both divisional parts. (3) The leftmost frontal cirrus develops from the undulating membrane primordium in both proter and opisthe. (4) Streak II–III generates the other frontal and the buccal cirri. (5) Streaks IV to n-1 give rise to the midventral rows. (6) The short ventral row posterior to the midventral rows originates also from the anlage n-1 (the last but one). (7) The fronto-terminal cirri are formed by the last streak of the fronto-ventral-transverse anlagen. (8) Two anlagen develop within each marginal cirral row, each of which forms a separate marginal row. (9) One anlage develops within each of the three parental dorsal kineties in both dividers. (10) No caudal cirri are differentiated.

Thus the morphogenetic process is very similar to its congener, Metaurostylopsis marina ( Kahl, 1932) Song et al., 2001 ( Song et al. 2001), though some details of this new species remain unknown because certain divisional stages have not yet been observed.

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