Description
Neck constricted at or near base; stalk relatively short; funnel of cone prominently folded on left (Fig . 36). Crumeyrolle , 1988) I RIA SUBCLASS SUCTORIA Claparede and Lachmann , 1858 Mature sessile trophonts , usually non- ciliated, with one to many tentacles that ingest prey ; extrusomes (haptocysts) at tentacle tips ; tentacles, short (e.g. , Cyathodinium, Phalacroc/eptes) or long and extensible (e.g ., Rhyncheta , Rhynchophrya), supported by an outer ring of microtubules and an inner set of microtubular ribbons (=phyllae); ciliated , migratory dispersal "larvae" or swarmers (usually formed by unequal cell division) typically bearing neither tentacles nor stalk; somatic monokinetids, each with slightly to moderately convergent postciliary ribbon , short laterally directed kinetodesmal fibril, and transverse fiber ; parasomal sacs on either side of kinetosome ; nematodesmatal "ribbon" ansmg from somatic kinetosomes, extending posteriorly beneath kinety ; many species , as trophonts , ectosymbiotic on other organisms; three orders. exogenous cytokinesis . B. Internal budding of Order Endogenida begun in a pouch , with endogenous cytokinesis . C. Internal budding of Order Evaginogenida begun in a pouch , with exogenous cytokinesis . (from Small and Lynn , 1985) NOTE: A group adapted to a sessile, sedentary I ife and whose modes of division are clearly systematically important may be subdivided by the key below. A field biologist may not find a suctorian dividing; therefore, the keys provide three separate paths for identification, the user deciding which convergent morphologies best fit the organism. CILIOPHORA, SUCTORIA 1. Budding beg inning on surface; cytokinesis exogenous (Fig. 1A) ...... ... .... .. ..... .. .... Exogenida 1'. Budding beginning in a cortical pouch .. ....... .... .. 2 2. Cytokinesis endogenous (Fig. 1B) ... Endogenida 2' . Cytokinesis begun in pouch , but completed exogenously (Fig. 1C) ...... ..... ... Evaginogenida
Type species
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Neck constricted at or near base; stalk relatively short; funnel of cone prominently folded on left (Fig . 36). Crumeyrolle , 1988) I RIA SUBCLASS SUCTORIA Claparede and Lachmann , 1858 Mature sessile trophonts , usually non- ciliated, with one to many tentacles that ingest prey ; extrusomes (haptocysts) at tentacle tips ; tentacles, short (e.g. , Cyathodinium, Phalacroc/eptes) or long and extensible (e.g ., Rhyncheta , Rhynchophrya), supported by an outer ring of microtubules and an inner set of microtubular ribbons (=phyllae); ciliated , migratory dispersal "larvae" or swarmers (usually formed by unequal cell division) typically bearing neither tentacles nor stalk; somatic monokinetids, each with slightly to moderately convergent postciliary ribbon , short laterally directed kinetodesmal fibril, and transverse fiber ; parasomal sacs on either side of kinetosome ; nematodesmatal "ribbon" ansmg from somatic kinetosomes, extending posteriorly beneath kinety ; many species , as trophonts , ectosymbiotic on other organisms; three orders. exogenous cytokinesis . B. Internal budding of Order Endogenida begun in a pouch , with endogenous cytokinesis . C. Internal budding of Order Evaginogenida begun in a pouch , with exogenous cytokinesis . (from Small and Lynn , 1985) NOTE: A group adapted to a sessile, sedentary I ife and whose modes of division are clearly systematically important may be subdivided by the key below. A field biologist may not find a suctorian dividing; therefore, the keys provide three separate paths for identification, the user deciding which convergent morphologies best fit the organism. CILIOPHORA, SUCTORIA 1. Budding beg inning on surface; cytokinesis exogenous (Fig. 1A) ...... ... .... .. ..... .. .... Exogenida 1'. Budding beginning in a cortical pouch .. ....... .... .. 2 2. Cytokinesis endogenous (Fig. 1B) ... Endogenida 2' . Cytokinesis begun in pouch , but completed exogenously (Fig. 1C) ...... ..... ... Evaginogenida