Suborder: Frontoventral cirri as 2 or more zig-zag files almost full length of ventrum.
Family: Frontal cirri differ in size and/or pattern from ventral ones of files; "collar" extends short distance along right edge of body; oral area not U-shaped (Illustrated Guide, 1985).
Genus: Many species; usually ovoid or elongate in shape; AZM 1/4 of the body length; two rows of ventral cirri; frontal cirri present (Carey, 1992). Frontventral cirri in zig-zag files; rear rounded, body oval to long (Illustrated Guide, 1985).

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Holosticha sp.1 many Mac. 150-170 x 40 μm Japan, 1998	H. polystylata many Mac. 200-212 x 67 μm Japan, 199?, 1999	Holosticha sp.2 many Mac. 132 x 41 μm Japan, 1998
H. diademata ? two Mac. 126 x 30 μm Japan, 1998, 99	H. diademata ? two Mac. 115 x 40 μm Saitama, 1999	Holosticha sp. 56 x 20 μm Saitama, 1999

Similar Genus ->> Urostyla ; Pseudourostyla; Amphisiella

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2 or more right marginal files of cirri .
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