infrabasal

infrabasal

[¦in·frə′bā·səl]
(biology)
Inferior to a basal structure.
References in periodicals archive ?
Infrabasal circlet of five identical plates; visible in lateral view of cup.
It is different from Arachnocrinus in the conical rather than rounded cup, five infrabasals, rather than single fused conical infrabasal circlet, the presence of an anal plate in the cup, in the axillary primibrachials and secundibrachials contacting the radial facet, completely different arm construction and in the rounded rather than square outline of the stem facet, with a wide axial canal with no additional canals.
Infrabasals presumably five and equal in size; infrabasal circlet low, approximately 18% of aboral cup height; infrabasal concavity absent.