The Echinoid Directory

Glossary

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Glossary terms beginning with: I

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inner (fasciole)
A fasciole band that encircles the adapical part of the anterior ambulacrum but does not enclose the petals, passing closer to the apical disc than any well-developed petal pore-pairs.
inner (fasciole)
insert
An arrangement of apical disc plates in which the ocular plates (white) are separated from the periproct opening by genital plates (purple) (dicyclic plating).
insert
interambulacra
pleural of interambulacrum
interambulacra
interambulacrum (-al)
Of or pertaining to the plates separating ambulacral zones in the corona and which are usually biserially arranged.
interambulacrum (-al)
interporal partition
The calcite bar that separates the two pores in a pore-pair.
interporal partition
interradial
at or towards the centre of the interambulacral zone (direction)
interradial
interradius
Suture separating the two columns of interambulacral plates
interradius
isopore
An ambulacral pore-pair connecting tube-foot and internal water vessel composed of a pair of similar-sized pores.
isopore