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Very large corona with no cilia (may have setae).
No toes.
Order Collothecacea
![Collotheca campanulata](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/PACollothecacampanulataCorona.jpg)
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Corona a double wreath in which the cilia of the
inner circle are longer than those of the outer, with a ciliated
furrow between. No toes.
Order Floscularidae (most)
![Conochilus hippocrepis](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/ANSPConochilushippocrepis_small.jpg) ![Hexarthra mira](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/RRHexarthramira4.jpg)
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Long moveable spines attached like arms. No foot
or toes.
Order Floscularidae
Family
Testudinellidae
Genus Filinia
![Filinia longiseta](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/ANSPFilinialongiseta_small.jpg)
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Corona not especially large. No foot or toes. Lorica
flat or 4-lobed in cross-section. Plates confluent at edges.
Order Floscularidae
Family
Testudinellidae
Genus Pompholyx
![Pompholyx sulcata](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/PAPompholyxsulcata.jpg)
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Round with foot ending in a tuft of cilia rather
than toes.
Order Floscularidae
Family
Testudinellidae
Genus Testudinella
![Testudinella parva](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/PATestudinellaparva.jpg)
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Corona reduced to a subequatorial fringe. No foot
or toes.
Order Floscularidae
Family
Testudinellidae
Genus Trochosphaera
Photo NA
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Corona not especially large, and not a double wreath.
1-2 toes.
Order Ploima
(most)
![Lecane stenroosi](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/ANSPLecanestenroosi_small.jpg) ![Notommata copeus](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/ANSPNotommatacopeus_small.jpg)
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Corona not especially large. No foot or toes. With
rigid, immobile spines oriented anterior and posterior
Order Ploima (in part)
![Brachionus havanaensis](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/ANSPBrachionushavanaensis_small.jpg)
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Corona not especially large. Sac shaped with no
foot or toes.
Order Ploima (in part)
![Asplanchnopus multiceps](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/ANSPAsplanchnopusmulticeps_small.jpg)
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Corona not especially large. No foot or toes. Lorica
ventral plate flate and dorsal arched. Plates separated by an infolded
cuticle.
Order Ploima (in part)
Family
Brachionidae
Genus Anuraeopsis
![Anuraeopsis fissa](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/PAAnuraeopsisfissa.jpg)
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12 moveable paddlelike appendages. No foot or toes.
Order Ploima
Family
Synchaetidae
Genus Polyarthra
![Polyarthra dolichoptera](https://webarchive.library.unt.edu/eot2008/20080923224400im_/http://www.glerl.noaa.gov/seagrant/GLWL/Zooplankton/Rotifers/Images/PAPolyarthradolichoptera.jpg)
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