<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31339649</termId><termName>Bivalvia</termName><termType>PT</termType><termNote><![CDATA[ Class of mollusks characterized by a two-piece, hinged outer shell divided from front to back into left and right valves, and large, flattened gills covered with tiny beating cilia; most species are sedentary, often burrowing, filter feeders such as clams, oysters, and others. ]]></termNote><termCreatedDate>2026-03-30 20:31:36</termCreatedDate><relation><relationType>UF</relationType><termId>31339650</termId><termName>Acephala</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339651</termId><termName>Lamellibranchia</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339652</termId><termName>Lamellibranchiata</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339653</termId><termName>Pelecypoda</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339654</termId><termName>acephals</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339655</termId><termName>bivalve</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339656</termId><termName>bivalves</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339657</termId><termName>lamellibranchs</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31339658</termId><termName>pelecypods</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31316346</termId><termName>Mollusca</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31370416</termId><termName>clams</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31370418</termId><termName>Pteriomorphia</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31370419</termId><termName>mussels</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31370421</termId><termName>Heterodonta</termName><termType>PT</termType></relation></term>  </Zthes>