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5.TheBrachionidaeandtheEuchlanidaefeatureastronglydevelopedpartof
theheadanteriortothemouthandawell-developedbuccalfieldextendingto
theapicalpartofthehead.Thereare3-5ciliatedlobeswhichmaycarrysetae.
Theapicalfieldissmall.Thecircularbandconsistsofasingleringoflongcilia
andisusedforlocomotionandfeeding(Fig.7F,G).
6.TheCollothecidaeshowagreatlymodifiedcorona,resemblingafunnelwith
whichtocatchprey;itsedgesareprotractedtoformlongerorshorterlobes.
Theciliaaretransformedintolong,stiffsetaeoccurringintufts.Theapical
bandismoreorlessreduced.Insidethefunnelthereisasmallcircleofcilia
(Fig.7H,I).
7.CupelopagisandAtrochushavethecoronawithasmoothmargin,afewsmall
horn-likeprocessesbeingvisibleinAtrochus(Fig.23B,D).
Fig.6.Senseorgans;A-Synchaetapectinata;B-Ascomorpha;C-Filinia;D-Rotaria:dorsal
antennae;E-Trichocercarattus;F-Conochilus;G-Tetrasiphon:lateralantennae;H,Euchlanis:
posteriorantennae(afterWULFERT1969).Symbols:aa-apicalantenna;pw-pitswithantennae;
da-dorsalantenna;ca-coronaantennae;me-membranellae;br-brain;au-auricles;
tn-tentacle(palp)
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