The shape of the Discurria insessa are nearly oval or can be elongated with the right and left margins of the shell nearly parallel to the distance.

[1] This marine species occurs from South Alaska to Baja California, Mexico.

The geograpichal range of Disccuria inessa is Wranglell Island, Alaska to Bahia Magdalena, Baja, California.

[2][3] Discurria insessa is believed to live only on Egregia menziesii (feather boa kelp).

Larvae settle preferentially on large, crowded, post-reproductive Egregia and on fronds which already have adults.