Editing Sea slug (section)

==Diversity in sea slugs==
Like many nudibranchs, ''[[Glaucus atlanticus]]'' can store and use stinging cells, or [[nematocysts]], from its prey ([[Portuguese man o' war]]) in its finger-like [[cerata]].<ref>{{Cite journal |last1=Thompson |first1=T. E. |last2=Bennett |first2=I. |date=1969-12-19 |title=Physalia Nematocysts: Utilized by Mollusks for Defense |url=https://www.science.org/doi/10.1126/science.166.3912.1532 |journal=Science |language=en |volume=166 |issue=3912 |pages=1532–1533 |doi=10.1126/science.166.3912.1532 |pmid=17742854 |bibcode=1969Sci...166.1532T |issn=0036-8075|url-access=subscription }}</ref>
Other species, like the Pyjama slug ''[[Chromodoris quadricolor]]'', may use their striking colors to advertise their foul chemical taste.

The lettuce sea slug (''[[Elysia crispata]]'') has lettuce-like ruffles that line its body. This slug, like other [[Sacoglossa]], uses [[kleptoplasty]], a process in which the slug absorbs [[chloroplasts]] from the [[algae]] it eats, and uses "stolen" cells to [[Photosynthesis|photosynthesize]] sugars. The ruffles of the lettuce sea slug increase the slug's surface area, allowing the cells to absorb more light.

Headshield slugs, like the ''[[Chelidonura varians]]'', use their shovel-shaped heads to dig into the sand, where they spend most of their time. The shield also protects sand from entering the mantle during burrowing.

''[[Peronia indica]]'' is a [[species]] of air-breathing sea slug, a shell-less [[marine (ocean)|marine]] [[pulmonate]] [[gastropod]] [[mollusk]] in the [[family (biology)|family]] [[Onchidiidae]].<ref name="WoRMS">MolluscaBase (2019). MolluscaBase. Peronia indica (Labbé, 1934). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1033079 on 2019-10-05</ref>

The largest species of sea hare, the California black sea hare, ''[[Aplysia vaccaria]]'' can reach a length of 75 centimetres (30&nbsp;in) and a weight of 14 kilograms (31 lb).<ref>{{Cite web |title=WoRMS - World Register of Marine Species - Aplysia californica J. G. Cooper, 1863 |url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=240765 |access-date=2024-02-09 |website=www.marinespecies.org |language=en}}</ref> Most sea hares have several defenses; in addition to being naturally toxic, they can eject a foul ink or secrete a viscous slime to deter predators.

Some species of [[Acochlidiacea|acochlidian]] sea slugs have made evolutionary transitions to living in freshwater streams<ref>{{Cite journal|last1=Schrödl|first1=Michael|last2=Neusser|first2=Timea P.|date=2010-01-01|title=Towards a phylogeny and evolution of Acochlidia (Mollusca: Gastropoda: Opisthobranchia)|journal=Zoological Journal of the Linnean Society|language=en|volume=158|issue=1|pages=124–154|doi=10.1111/j.1096-3642.2009.00544.x|issn=0024-4082|doi-access=free}}</ref> and there is at least one evolutionary transition to land.<ref>{{Cite journal|last1=Kano|first1=Yasunori|last2=Neusser|first2=Timea P.|last3=Fukumori|first3=Hiroaki|last4=Jörger|first4=Katharina M.|last5=Schrödl|first5=Michael|date=2015-10-01|title=Sea-slug invasion of the land|journal=Biological Journal of the Linnean Society|language=en|volume=116|issue=2|pages=253–259|doi=10.1111/bij.12578|issn=0024-4066|doi-access=free}}</ref>