planospiral

planospiral

[¦plā·nō′spī·rəl]
(invertebrate zoology)
Having the shell coiled in one plane, used particularly of foraminiferans and mollusks.
References in periodicals archive ?
74, 75) up to 15 mm, sinistral, planospiral, with 4.
76, 77) up to 7 mm, but mostly less than 4 mm, planospiral, 3.