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==Polmone degli [[invertebrato|invertebrati]]==
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Alcuni [[invertebrato|invertebrati]] hanno anch'essi "polmoni", ma non così sviluppati come quelli dei [[vertebrato|vertebrati]]. Alcuni [[aracnide|aracnidi]] hanno una struttura chiamata "[[polmoni a libro]]", atti proprio allo scambio di gas. I [[granchio|granchi]] usano strutture chiamate [[branchiostegal]], le quali permettono la respirazione sott'acqua. I [[Polmonati]] sono un ordine di [[lumaca|lumache]] che hanno sviluppato dei primitivi polmoni.
<big>'''''QUESTA PARTE E' ANCORA DA TRADURRE!'''''</big>
==Amphibian lungs==
The lungs of most [[frog]]s and other [[amphibian]]s are simple balloon-like structures, with gas exchange limited to the outer surface area of the lung. This is not a very efficient arrangement, but amphibians have low metabolic demands and also frequently supplement their oxygen supply by diffusion across the moist outer skin of their bodies. Unlike mammals, which use a breathing system driven by [[negative pressure]], amphibians employ [[positive pressure]]. Note that the majority of salamander species are [[lungless salamander]]s and conduct respiration through their skin and the tissues lining their mouth.
==Invertebrate lungs==
Some invertebrates have "lungs" that serve a similar respiratory purpose but are not evolutionarily related to vertebrate lungs. Some [[arachnid]]s have structures called "[[book lung]]s" used for atmospheric gas exchange. The [[Coconut crab]] uses structures called [[branchiostegal]] lungs to breathe air and indeed will drown in water, hence it breathes on land and holds its breath underwater. The [[Pulmonata]] are an order of snails and slugs that have developed "lungs".
