Description
2' . With f Frontoventral cirri as 2 or more zig-zag files almost full length of ventral surface; these zig-zag 3. With 2 o files may range from a "single" file of zig-zag or margin offset cirri to multiple and short files of cirri that 3' . Not as are offset (=developed zig-zag) at their anterior and posterior ends (e .g., Eschaneustyla) ; three 4. With sev families. cirral 4' . With n b 5. With tra Y<9 5' . Transv 6. Frontove 1. Frontal cirri form a conspicuous, arc-like f i I e anterio that parallels the anterior left serial oral 6'. Frontov polykinetids .... ................................... ......... ... ... 2 equator 1'. Frontal cirri not so conspicuously organized .. .......... .................. ..... .. ..... ... ... ... ... . Urostylidae 7. Frontove obliqu 2. 2-7 left marginal files of cirri , several right 7' . Fronto files .................. .... ............ Pseudourostylidae y 1 (rarely 2) left files ...... .... ...................... . ................... ...... .......... Pseudokeronopsidae
Type species
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2' . With f Frontoventral cirri as 2 or more zig-zag files almost full length of ventral surface; these zig-zag 3. With 2 o files may range from a "single" file of zig-zag or margin offset cirri to multiple and short files of cirri that 3' . Not as are offset (=developed zig-zag) at their anterior and posterior ends (e .g., Eschaneustyla) ; three 4. With sev families. cirral 4' . With n b 5. With tra Y<9 5' . Transv 6. Frontove 1. Frontal cirri form a conspicuous, arc-like f i I e anterio that parallels the anterior left serial oral 6'. Frontov polykinetids .... ................................... ......... ... ... 2 equator 1'. Frontal cirri not so conspicuously organized .. .......... .................. ..... .. ..... ... ... ... ... . Urostylidae 7. Frontove obliqu 2. 2-7 left marginal files of cirri , several right 7' . Fronto files .................. .... ............ Pseudourostylidae y 1 (rarely 2) left files ...... .... ...................... . ................... ...... .......... Pseudokeronopsidae