Description
Cirral files curved or spiral obliquely around body , some ending on dorsal surface; dorsal surface as a helical strip around body ; family probably polyphyletic ; 12 genera b 9<9 1. Loricate ... ....... ............. ...... ....... ....... .. ....... ..... 1'. Aloricate ... ..... .... ... ... .. .. .. .... .. .. .................... 2. Tapered anterior end in form of corkscrew .... ..... ........ .... .. .. ... .. ...... .. .. ...... .. .... ...... ... .. Cha 2' . Tapered anterior end not twisted . Stichotricha 3. Oral cavity broad; six oblique cirral files encircle posterior half of body ; planktonic .. ...... . . .... . . . . . .. . . . . . . . .. .... . .... . .... . . . .. . . . . 3' . Oral cavity not broad .. .... .. .... ...... ...... .. ...... .... .... 4. Several closely adjacent cirral rows make at least 2 hel ical turns .. .. .. .. .... .. .... .. .. .. .. .. .. .... Atract 4'. Cirral files make less than 2 helical turns ... .. .... ......... ... .. ........ ...... ... .... ........ .. .... .... 5. Body plump , with rostrum ; 2 groups of ventral cirri , 1 on each side ; planktonic .... . Spire tel/a 5'. Body not as above .. .. ........ .. .. .. .. .. .... ...... .......... .. 6. Body elongate .. .. .. .... .. .. .. .. ...... .. .. .... .... .. .. .. .. 6'. Body ovoid; rightmost cirral file ending on dorsal anterior surface ...... .. Mucotrichidium 7. With tapered posterior end and rounded anterior end ; leftmost cirral file begins on dorsal posterio r surface.. ...... .. .. .. .. .. ... Strongylidium 7'. With both anterior and posterior ends tapered .. .. ... ...... ..... .. ... .. .. .... ... .. .. ... .. ..... .... Urostrongy
Type species
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Cirral files curved or spiral obliquely around body , some ending on dorsal surface; dorsal surface as a helical strip around body ; family probably polyphyletic ; 12 genera b 9<9 1. Loricate ... ....... ............. ...... ....... ....... .. ....... ..... 1'. Aloricate ... ..... .... ... ... .. .. .. .... .. .. .................... 2. Tapered anterior end in form of corkscrew .... ..... ........ .... .. .. ... .. ...... .. .. ...... .. .... ...... ... .. Cha 2' . Tapered anterior end not twisted . Stichotricha 3. Oral cavity broad; six oblique cirral files encircle posterior half of body ; planktonic .. ...... . . .... . . . . . .. . . . . . . . .. .... . .... . .... . . . .. . . . . 3' . Oral cavity not broad .. .... .. .... ...... ...... .. ...... .... .... 4. Several closely adjacent cirral rows make at least 2 hel ical turns .. .. .. .. .... .. .... .. .. .. .. .. .. .... Atract 4'. Cirral files make less than 2 helical turns ... .. .... ......... ... .. ........ ...... ... .... ........ .. .... .... 5. Body plump , with rostrum ; 2 groups of ventral cirri , 1 on each side ; planktonic .... . Spire tel/a 5'. Body not as above .. .. ........ .. .. .. .. .. .... ...... .......... .. 6. Body elongate .. .. .. .... .. .. .. .. ...... .. .. .... .... .. .. .. .. 6'. Body ovoid; rightmost cirral file ending on dorsal anterior surface ...... .. Mucotrichidium 7. With tapered posterior end and rounded anterior end ; leftmost cirral file begins on dorsal posterio r surface.. ...... .. .. .. .. .. ... Strongylidium 7'. With both anterior and posterior ends tapered .. .. ... ...... ..... .. ... .. .. .... ... .. .. ... .. ..... .... Urostrongy