The Echinoid Directory

Glossary

Click on a letter, or enter the start of a word into the search box

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Glossary terms beginning with: I

show all images

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. (show image)
insert
An arrangement of apical disc plates in which the ocular plates are in contact with the periproct (monocyclic plating).
insert
interambulacra
pleural of interambulacrum (show image)
interambulacrum (-al)
Of or pertaining to the plates separating ambulacral zones in the corona and which are usually biserially arranged. (show image)
interporal partition
The calcite bar that separates the two pores in a pore-pair. (show image)
interradial
at or towards the centre of the interambulacral zone (direction) (show image)
interradius
Suture separating the two columns of interambulacral plates (show image)
isopore
An ambulacral pore-pair connecting tube-foot and internal water vessel composed of a pair of similar-sized pores. (show image)