| buccalpodia | | first larval stage that follows fertilization in Holothuroidea |
| auricullarian | | dirverticulum from gut at the base of the proboscis in Hemichordata |
| ossicles | | arms of Crinoidea that trap food in ciliated ambilucral grooves that lead to the mouth |
| comatulid | | process of expelling out all guts and internal organ as a stress response but is later regenerated in Holothuroidea |
| bipemaria | | outer layer of Sea Squirts used for protection |
| BursalSacs | | allows for movement near peristomal membrance in Echinoidea |
| bivium | | fluid filled canals that serves as tendon in the Echinoderms and it derived from the hydrocoel, used for locomotion and feeding |
| madroporite | | stalked larval stage that settles to substrate and follows the vitellaria stage in Crinoidea |
| evisceration | | non-feeding planktonic larval stage that follows fertilization in Crinoidea |
| tunicin | | second larval stage that follows auricullarin in Holothuroidea |
| stomatocord | | the three rows of tube feet that face the substrate in Holothuroidea |
| endostyle | | larval stage that follows zygote in Echinoderms |
| pentaculla | | planktonic larval stage following bipemaria in Asteroidea |
| pedicellariae | | located in the ring canal, this aids in the regulation of pressure in the water vascular system |
| watervascularsystem | | 10 sacs, 2 at the end of each arm that acts as the respiratory system in Brittle Stars |
| ophioplueteus | | located on oral surface, this is where water enters into the water vascular system |
| polianVessicles | | calcerous plates lined with tubules and spines |
| trivium | | cells within the hemosystem that contains vanadium that assists in the production of tunicin |
| cuvierientubules | | larval stage that follows fertilization in Echinoidea |
| periproct | | found at the base of the spines, these tubes aid in gas exchange and excretions |
| Vanadocytes | | help keeps body free of settling planktonic larva and sometime aids in feeding, located on ossicles |
| brachiolaria | | planktonic larval stage that follows zygote in Brittle Stars |
| vitellaria | | third larval stage in Holothuroidea, follows diolarin and last stage before adult |
| echinopluteus | | tadpole larval stage that follows fertilization in Ascidiacea, possesses all characteristics of Chordata |
| papulae | | expelled in responsed to a predatos that contains a poison called holothurin, very sticky and can immobilize |
| pentacrinoid | | the two rows of tube feet that face upwards in Holothuroidea |
| appendicularian | | the mobile adult version of the Class Crinoidea |
| pimules | | bilateral planktonic larval stage that follows zygote in Asteroidea |
| diolarin | | plates that surround the anus Echinoidea |
| actinotrocha | | produces mucus that moves across the gills basket for food in Ascidiacea |
