<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">Hydra</topic></authority><related type="broader"><topic>Hydridae</topic></related><variant type="other"><topic>hydra</topic></variant><variant type="other"><topic>hydrae</topic></variant><variant type="other"><topic>hydras</topic></variant> <note xml:lang="en"><![CDATA[ Members of a genus containing freshwater invertebrate animals of very simple structure, the body having the form of a cylindrical tube, with a mouth surrounded by a ring of tentacles with stinging thread-cells, usually living attached to objects or plants, though able to float or move by cartwheeling from base to tentables; they reproduce by buds or eggs. ]]></note></mads>