<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31339611</termId><termName>Echinoidea</termName><termType>PT</termType><termNote><![CDATA[ Members of a class containing around 950 living species of marine invertebrates having a globular or discoid form, and a rigid shell composed of many calcareous plates, in some species covered with projecting spines. ]]></termNote><termCreatedDate>2026-03-30 20:31:35</termCreatedDate><relation><relationType>UF</relationType><termId>31339612</termId><termName>sea urchin</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339613</termId><termName>sea urchins</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339614</termId><termName>sea-urchins</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339615</termId><termName>urchins, sea</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31316331</termId><termName>Echinodermata</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31370350</termId><termName>Clypeastroida</termName><termType>PT</termType></relation></term>  </Zthes>