Boreomysis sibogae is a species of mysid crustaceans from the subfamily Boreomysinae (family Mysidae).

The species is an epi-bathypelagic mysid, widely distributed in the Indo-Pacific and possibly also in the Atlantic Ocean.

The material went to a Danish zoologist Hans Jacob Hansen, who shortly described a new species Boreomysis sibogae in 1910.

[3][1] In 1937 I. Coifmann described a small male with long eye papilla and long terminal spiniform setae of telson from the Gulf of Aden in the Northwest Indian Ocean under the name Boreomysis spinifera.

[7] However, the specimens they dealt with had the dilatation of the telson cleft, and thus did not belong to neither B. sibogae, nor to B. spinifera, but most probably to B. sphaerops.

The synonymisation was supported by all subsequent workers, though the species is still considered taxonomically difficult due to immaturity of the types, poor preservation and great variability.

sibogae are large or moderate in size, but never dominating over the stalk, and bear papilla, which is quite variable from small to rather long.

Antennal scale is relatively broad (4.7–5.5 times as long as wide), with apical part not produced beyond the outer spine.

In juveniles of B. sibogae, however, this part of the antennal scale can be slightly produced, making the relationship between the four taxa rather confusing.

[1] Unlike most of boreomysines B. sibogae was occasionally recorded in epipelagic zone at depth of 50-200 m. Most of findings are still deeper than 1000 m (down to 5000 m).