Editing Amphipoda (section)

===Size===
[[File:Amphipodredkils (flipped).jpg|thumb|right|Amphipods are typically less than {{convert|10|mm|1}} long.]]
[[File:Lepidepecreum longicornis.jpg|thumb|''[[Lepidepecreum longicorne]]'' ([[Amphilochidea]]: [[Lysianassidae]])]]
[[File:Pariambus typicus.jpg|thumb|''[[Pariambus typicus]]'' ([[Senticaudata]]: [[Caprellidae]])]]
[[File:Hyperia galba.jpg|thumb|''[[Hyperia galba]]'' ([[Hyperiidea]]: [[Hyperiidae]])]]

Amphipods are typically less than {{convert|10|mm|1}} long, but the largest recorded living amphipods were {{convert|28|cm}} long, and were photographed at a depth of {{convert|5300|m}} in the [[Pacific Ocean]].<ref name="Morris">{{cite book |first1=J. Laurens |last1=Barnard |first2=Darl E. |last2=Bowers |first3=Eugene C. |last3=Haderlie |chapter=Amphipoda: The Amphipods and Allies |title=Intertidal Invertebrates of California |editor1-first = Robert H. | editor1-last = Morris | editor2-first = Robert Hugh | editor2-last = Morris | editor3-first = Donald Putnam | editor3-last = Abbott | editor4-first = Eugene Clinton | editor4-last = Haderlie  |pages=559–566 |year=1980 |publisher=[[Stanford University Press]] |isbn=0-8047-1045-7}}</ref> Samples retrieved from the stomach of a [[black-footed albatross]] had a reconstructed length of {{convert|34|cm}}; it was assigned to the same species, ''[[Alicella gigantea]]''.<ref>{{cite journal |doi=10.2307/1548395 |title=The supergiant amphipod ''Alicella gigantea'' Chevreux from the North Pacific Gyre |first1=J. Laurens |last1=Barnard |first2=Camilla L. |last2=Ingram |journal=[[Journal of Crustacean Biology]] |volume=6 |issue=4 |year=1986 |pages=825–839 |jstor=1548395}}</ref> A study of the [[Kermadec Trench]] observed more specimens of ''A. gigantea'', the largest of which was estimated at 34.9&nbsp;cm long, and collected some for examination, the largest of which was measured at 27.8&nbsp;cm long.<ref>{{Cite journal |last1=Jamieson |first1=A. J. |last2=Lacey |first2=N. C. |last3=Lörz |first3=A. -N. |last4=Rowden |first4=A. A. |last5=Piertney |first5=S. B. |date=2013-08-01 |title=The supergiant amphipod Alicella gigantea (Crustacea: Alicellidae) from hadal depths in the Kermadec Trench, SW Pacific Ocean |url=https://www.sciencedirect.com/science/article/pii/S0967064512001932 |journal=Deep Sea Research Part II: Topical Studies in Oceanography |series=Deep-Sea Biodiversity and Life History Processes |language=en |volume=92 |pages=107–113 |doi=10.1016/j.dsr2.2012.12.002 |bibcode=2013DSRII..92..107J |issn=0967-0645|url-access=subscription }}</ref> The smallest known amphipods are less than {{convert|1|mm|2}} long.<ref>{{cite journal |doi=10.1098/rstb.1969.0014 |title=The fauna of Rennell and Bellona, Solomon Islands |first=T. |last=Wolff |journal=Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences |volume=255 |issue=800 |year=1969 |pages=321–343 |jstor=2416857|bibcode=1969RSPTB.255..321W |doi-access= }}</ref> The size of amphipods is limited by the availability of [[dissolved oxygen]], such that the amphipods in [[Lake Titicaca]] at an altitude of {{convert|3800|m}} can only grow up to {{convert|22|mm}}, compared to lengths of {{convert|90|mm}} in [[Lake Baikal]] at {{convert|455|m|-2}}.<ref>{{cite journal |first1=L.&nbsp;S. |last1=Peck |first2=G. |last2=Chapelle |title=Reduced oxygen at high altitude limits maximum size |doi=10.1098/rsbl.2003.0054 |journal=[[Proceedings of the Royal Society B]] |year=2003 |volume=270 |issue=Suppl 2 |pages=S166–S167 |pmid=14667371 |pmc=1809933}}</ref>

Some amphipods exhibit [[sexual dimorphism]]. In dimorphic species, males are usually larger than females, although this is reversed in the genus [[Crangonyx]].<ref name=Glazier/>