Description
With characters of the family (Fig. 46). Beinbrech , 1967) CILIOPHORA , PERITRI Figs. 47-53. Peritrichia . Fig . 47 . Lorica of Platycola sp. SEM . Fig. 48 . Vorticella microstoma . Phase contrast. Fig . 49 . Opercularia sp . Note two individuals on a non-contractile stalk. Phase contrast . Fig . 50 . Vorticella in a contracted state. Note that both the cell body and the stalk are contractile (cf. Fig . 48). Fig . 51 . Carchesium polypinum colony . Phase contrast. Fig. 52 . A zooid of Episty /is sp. Phase co ntrast. Fig . 53 . Zooids of large colony of Epistylis galeata. SEM . 634 CILIOPHORA, ASTOMATIA SUBCLASS ASTOMATIA Schewiakoff, 1896 6 Mouthless symbionts (parasites? ), living 6 in guts of annelids, especially oligochaetes ; somatic monokinetids like those of other 7 Oligohymenophorea, with a divergent postciliary 7 ribbon (absent in some genera), distinct , anteriorly di rected ki netodesmal fibril originating near triplets 5-7, a radial, transverse ribbon near triplets 3,4 (reduced to distinct) and extending laterally towards adjacent kinety ; cortical a cytoskeleton in thi gmotactic region may be s conspicuously developed as anterior attachment o structure (s); one order. NOTE: Because the ciliates in this subclass are mouthless , there are relat ively few characters , such as the structure of attachment organelles and the patte rn of suture systems , that can be used to separate taxa . It is not known how subject to converg ence these features are , and this will only be known when molecular studies test the 1 relationsh ips among genera.
Type species
Figures
Raw text
With characters of the family (Fig. 46). Beinbrech , 1967) CILIOPHORA , PERITRI Figs. 47-53. Peritrichia . Fig . 47 . Lorica of Platycola sp. SEM . Fig. 48 . Vorticella microstoma . Phase contrast. Fig . 49 . Opercularia sp . Note two individuals on a non-contractile stalk. Phase contrast . Fig . 50 . Vorticella in a contracted state. Note that both the cell body and the stalk are contractile (cf. Fig . 48). Fig . 51 . Carchesium polypinum colony . Phase contrast. Fig. 52 . A zooid of Episty /is sp. Phase co ntrast. Fig . 53 . Zooids of large colony of Epistylis galeata. SEM . 634 CILIOPHORA, ASTOMATIA SUBCLASS ASTOMATIA Schewiakoff, 1896 6 Mouthless symbionts (parasites? ), living 6 in guts of annelids, especially oligochaetes ; somatic monokinetids like those of other 7 Oligohymenophorea, with a divergent postciliary 7 ribbon (absent in some genera), distinct , anteriorly di rected ki netodesmal fibril originating near triplets 5-7, a radial, transverse ribbon near triplets 3,4 (reduced to distinct) and extending laterally towards adjacent kinety ; cortical a cytoskeleton in thi gmotactic region may be s conspicuously developed as anterior attachment o structure (s); one order. NOTE: Because the ciliates in this subclass are mouthless , there are relat ively few characters , such as the structure of attachment organelles and the patte rn of suture systems , that can be used to separate taxa . It is not known how subject to converg ence these features are , and this will only be known when molecular studies test the 1 relationsh ips among genera.