Collecting site
Antonovo (Rakumaka, Rakuma) village, north of Kholmsk, southern coast of Sakhalin (Saghalien, Saghalin, Karafuto, Kabafuto) Island, Russia
12 km north of Kholmsk, near tghe Antonovo village
latitude: 47.133331     47°7'59.99"N
longitude: 142.066666     142°3'60"E
[Precision of location: Alexandria Digital Library (with NGA GNDB data)] 
[Site Named Here by name of site (or city, etc.)] 
Collected here:
| Oxyposthia praedator Ivanov, 1952 | 1946 | 1-2 m | sand, gravel, silt | overgrown with Zostera, and with an infusion of Sargassum and other seaweeds.  Sargassum yielded large numbers of specimens, but also found in gravel in the Laminaria Zone among the rhyzoids. | 
| Otocelis sachalinensis Ivanov, 1952 | 1946 | 1-2 m |  | especially abundant among the growth of Sargassum on various substrates. | 
| Convoluta sagittifera Ivanov, 1952 | late summer, fall 1946 | 0.5-2 m |  | One of the most common acoels in the littoral zone of the Island.  great numbers among the seaweeds on different substrates. | 
| Oxyposthia praedator var rufa Ivanov, 1952 | 1946 | 1-2 m |  | shallow water among the sea weed. |