Gonostomum Sterki, 1878 3' . Onl
Description
Paroral and endoral parallel to each other with 4. Marg endoral anterior to paroral; some frontoventral 4' . Mar cirri form a file along anterior right border of peristomal area ; transverse cirri; transverse 5. More cirri; caudal cirri , posterior and dorsal (Fig. 58). ora 5' . Six 6. At le I ! cir ( I 6' . Onl I ; I 1 7. Dors ! 't / t .... 7'. Dors 1-- [_, 8. More '~ . s ~ ..... A diff .. . 8'. Dorsal surface . From Song (1 990) . in AMILY OXYTRICHIDAE EHRENBERG, 1838 ntral cirri scattered over mid-area of surface, usually with three cirri posterior rior vertex of oral region but several ith conspicuous files of cirri (e .g., ella, Onychodromus); division morpho- shows 6 frontoventral anlagen streaks that ongitudinal fan-like form ; 22 genera. epresentative Genera in the Family b 9<9 with tail-like process ... Ancystropodium uch process .. ..... .............. ..... .... ... .. .............. 2 al cirri absent (Note : caudal cirri of kiella are an extension of left marginal al file) .............. .... ... ... ......... ... .. ... .... ...... ..... 3 al cirri present... ... .. ...... .. .. .... ..... ....... ....... . 6 ast one cirral file to left of right marginal ral file; transverse cirri may be in two ups ... .. ........... .. ... ... ...... .......... . Pleurotricha y a right marginal cirral file ..... .. ... ...... ... .. . 4 inal cirri confluent at rear .... Histriculus g inal cirri not confluent at rear. ... .. ... .. .. .. .. 5 than six frontoventral c1 m posterior to l region ; body firm .. .... ... Parastylonychia or fewer frontoventral c1m posterior of oral region; body contractile and flexible Tachysoma ast one file of cirri to left of right marginal ral file ...... ...... .. ... ......... ........ ..... ..... ..... ..... .. .. 7 y a right marginal cirral file ... ..... .... ... .. .. . 10 al kineties apparently disorganized ........ . .... ........ .... ... ... ... .... .. ...... ........ ... . Lauren tiel/a al kineties in organized files .... .... .. ...... .. ... 8 than five ventral cirral files with little erentiation of frontoventral cirri ... .... .. ... .. .. . ....... .. ... ...... .......................... .. Onychodromus Fewer than five ventral cirral files; ontoventral cirri differentiated from cirri files ....... .... ... .. ... .. ...... ... .... ...... ............. ..... ... 9 460 CILIOPHORA, STICH 9. Marginal cirral files distinctly separated posteriorly; some parental marginal files reta ined after division ; caudal cirri dorsal ........ .... ..... ........ ............ .... ... .. Coniculostomum 9' . Marginal cirral files not distinctly separated posteriorly ; no parental marginal files retained after division; caudal cirri ventral. .... ....... ........ . ... ..... .. .. .. .. ... .. .. ... .. .. .. .. .. ... .. .. ... . .. Onychodromopsis 10. Paroral bent in a broad arc along anterior margin of oral cavity .... .... .. .. ... .. Cyrtohymena 10' . Paroral not as above ... ... .... .. .......... ........... ... . 11 11. Caudal cirri enlarged , more than four along dorsal posterior margin of cell ; planktonic ..... . . . . .. . . . ... . . ... . .. . . .. . . ... . . .. . .... ... Pseudostrombidium 11'. Caudal cirri not as above ..... .. ................... .... 12 12 . Marginal cirral files appear almost confluent because caudal cirri are associated wit posterior end of left marginal cirral file ..... ...... . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . . .. . .. . . . . . . . . . . 12'. Marginal cirral files not confluent..... .. ... .... 13 13. Paroral distinctly curved with hooked distal end bent anteriorly and ventrally .Notohymena 13'. Paroral not as above ... ......... ... .. ..... ........ ....... 14 14. Endoral sinusoidal , fragmented in middle and widely separated from paroral. ... ........ ...... .. Steinia 14'. Endoral not fragmented .. .. ..... Australocirrus 15'. Left serial oral polykinetids termi anterior of anterior ends of paroral endoral. ........ .... ............ ....... ... ........ ..... ...... ... ... 16 16. Paroral and endoral long, straight , and parallel ; oral region wide and expansive .... .. . .. . . .. . ... . ... ... . ... . .. . .... ... . ... . . ... . .. . . . . .. . . . . Sty/onyc 16'. Paroral and endoral not long; oral region not wide and expansive .. .. ... ...... ......... ... ........ .... .... 17 17. Endoral cilia less densely packed, ending some distance anterior of paroral ; some species tailed ............... ..... ....... ....... .. .. .... .. .. .. ... Urosoma 17'. Paroral and endoral slightly curved with paroral crossing over endoral at about its middle ... ...... .. ..... .... .. ..... ..... .. .... ..... ... ....... ..... ... 18 18. One pretransverse ventral cirrus; three or fewer transverse cirri ... ... ......... ...... .. Urosomoida OTRICHA 18'. Two pretransverse ventral cirri; four or more transverse cirri .... .. .. ..... ... .... ... .... .... Oxytricha h . . . . . . . . Sterkiella (from Borror, 1972) .
Type species
Figures
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Raw text
Paroral and endoral parallel to each other with 4. Marg endoral anterior to paroral; some frontoventral 4' . Mar cirri form a file along anterior right border of peristomal area ; transverse cirri; transverse 5. More cirri; caudal cirri , posterior and dorsal (Fig. 58). ora 5' . Six 6. At le I ! cir ( I 6' . Onl I ; I 1 7. Dors ! 't / t .... 7'. Dors 1-- [_, 8. More '~ . s ~ ..... A diff .. . 8'. Dorsal surface . From Song (1 990) . in AMILY OXYTRICHIDAE EHRENBERG, 1838 ntral cirri scattered over mid-area of surface, usually with three cirri posterior rior vertex of oral region but several ith conspicuous files of cirri (e .g., ella, Onychodromus); division morpho- shows 6 frontoventral anlagen streaks that ongitudinal fan-like form ; 22 genera. epresentative Genera in the Family b 9<9 with tail-like process ... Ancystropodium uch process .. ..... .............. ..... .... ... .. .............. 2 al cirri absent (Note : caudal cirri of kiella are an extension of left marginal al file) .............. .... ... ... ......... ... .. ... .... ...... ..... 3 al cirri present... ... .. ...... .. .. .... ..... ....... ....... . 6 ast one cirral file to left of right marginal ral file; transverse cirri may be in two ups ... .. ........... .. ... ... ...... .......... . Pleurotricha y a right marginal cirral file ..... .. ... ...... ... .. . 4 inal cirri confluent at rear .... Histriculus g inal cirri not confluent at rear. ... .. ... .. .. .. .. 5 than six frontoventral c1 m posterior to l region ; body firm .. .... ... Parastylonychia or fewer frontoventral c1m posterior of oral region; body contractile and flexible Tachysoma ast one file of cirri to left of right marginal ral file ...... ...... .. ... ......... ........ ..... ..... ..... ..... .. .. 7 y a right marginal cirral file ... ..... .... ... .. .. . 10 al kineties apparently disorganized ........ . .... ........ .... ... ... ... .... .. ...... ........ ... . Lauren tiel/a al kineties in organized files .... .... .. ...... .. ... 8 than five ventral cirral files with little erentiation of frontoventral cirri ... .... .. ... .. .. . ....... .. ... ...... .......................... .. Onychodromus Fewer than five ventral cirral files; ontoventral cirri differentiated from cirri files ....... .... ... .. ... .. ...... ... .... ...... ............. ..... ... 9 460 CILIOPHORA, STICH 9. Marginal cirral files distinctly separated posteriorly; some parental marginal files reta ined after division ; caudal cirri dorsal ........ .... ..... ........ ............ .... ... .. Coniculostomum 9' . Marginal cirral files not distinctly separated posteriorly ; no parental marginal files retained after division; caudal cirri ventral. .... ....... ........ . ... ..... .. .. .. .. ... .. .. ... .. .. .. .. .. ... .. .. ... . .. Onychodromopsis 10. Paroral bent in a broad arc along anterior margin of oral cavity .... .... .. .. ... .. Cyrtohymena 10' . Paroral not as above ... ... .... .. .......... ........... ... . 11 11. Caudal cirri enlarged , more than four along dorsal posterior margin of cell ; planktonic ..... . . . . .. . . . ... . . ... . .. . . .. . . ... . . .. . .... ... Pseudostrombidium 11'. Caudal cirri not as above ..... .. ................... .... 12 12 . Marginal cirral files appear almost confluent because caudal cirri are associated wit posterior end of left marginal cirral file ..... ...... . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . . .. . .. . . . . . . . . . . 12'. Marginal cirral files not confluent..... .. ... .... 13 13. Paroral distinctly curved with hooked distal end bent anteriorly and ventrally .Notohymena 13'. Paroral not as above ... ......... ... .. ..... ........ ....... 14 14. Endoral sinusoidal , fragmented in middle and widely separated from paroral. ... ........ ...... .. Steinia 14'. Endoral not fragmented .. .. ..... Australocirrus 15'. Left serial oral polykinetids termi anterior of anterior ends of paroral endoral. ........ .... ............ ....... ... ........ ..... ...... ... ... 16 16. Paroral and endoral long, straight , and parallel ; oral region wide and expansive .... .. . .. . . .. . ... . ... ... . ... . .. . .... ... . ... . . ... . .. . . . . .. . . . . Sty/onyc 16'. Paroral and endoral not long; oral region not wide and expansive .. .. ... ...... ......... ... ........ .... .... 17 17. Endoral cilia less densely packed, ending some distance anterior of paroral ; some species tailed ............... ..... ....... ....... .. .. .... .. .. .. ... Urosoma 17'. Paroral and endoral slightly curved with paroral crossing over endoral at about its middle ... ...... .. ..... .... .. ..... ..... .. .... ..... ... ....... ..... ... 18 18. One pretransverse ventral cirrus; three or fewer transverse cirri ... ... ......... ...... .. Urosomoida OTRICHA 18'. Two pretransverse ventral cirri; four or more transverse cirri .... .. .. ..... ... .... ... .... .... Oxytricha h . . . . . . . . Sterkiella (from Borror, 1972) .