# Emuella

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{{Short description|Extinct genus of trilobites}}
{{Automatic taxobox
| fossil_range = {{Geological range|517}} late [Botomian](/source/Botomian)
| image = EmuellaPolymera.jpg
| image_caption = ''Emuella polymera''&nbsp; of the ''Emuella'' genus; Lower Cambrian Emu Shale, Kangaroo Island, South Australia<br/>(courtesy of Dave Simpson)
| taxon = Emuella
| authority = Pocock, 1970
| subdivision_ranks = Species
| subdivision = 
* ''Emuella polymera'' <small>Pocock, 1970</small><ref name="Paterson&Edgecombe">{{cite journal|last1= Paterson|first1= J.R.|last2= Edgecombe|first2= G.D.|title= The Early Cambrian Trilobite Family Emuellidae Pocock, 1970: Systematic Position and Revision of Australian Species|year= 2006|journal= Journal of Paleontology |volume= 80|issue= 3|pages= 496–513|url= http://www.bioone.org/doi/full/10.1666/0022-3360%282006%2980%5B496%3ATECTFE%5D2.0.CO%3B2|doi=10.1666/0022-3360(2006)80[496:TECTFE]2.0.CO;2|s2cid= 84868780|issn= 0022-3360|url-access= subscription}}</ref>
* ''Emuella dalgarnoi'' <small>Pocock, 1970</small><ref name="Paterson&Edgecombe"/>
}}

'''''Emuella''''' is a genus of [Cambrian](/source/Cambrian) [trilobite](/source/trilobite)s of the family [Emuellidae](/source/Emuellidae). Its fossils have been found in [South Australia](/source/South_Australia).

==Etymology==
The genus name means "little emu", and refers to [Emu Bay Shale](/source/Emu_Bay_Shale), on [Kangaroo Island](/source/Kangaroo_Island), one of the sites where fossils of ''Emuella'' have been collected. The species [epithet](/source/epithet) ''polymera'' is derived from Greek words πολύ -poly- meaning "many"; and μέρος -meros- meaning "part", for the many segmented thorax. ''E. dalgarnoi'' is named after R.C. Dalgarno, who discovered ''Balcoracania dailyi'' in the [Flinders Ranges](/source/Flinders_Ranges), near [Blinman](/source/Blinman), South Australia.<ref name='Pocock'>{{cite journal|last=Pocock|first=K.J.|year=1970|title=The Emuellidae, a new family of trilobites from the Lower Cambrian of South Australia|journal=Palaeontology|volume=13|pages=522–562}}</ref>

==Description==
It can be recognised by touching glabella and frontal border, and the sub-pentagonal head, as compared to, a short field between the front of the axis in the head or glabella and the border ridge, and a semi-circular headsheald in the sister-genus ''[Balcoracania](/source/Balcoracania)''. Both emuellid genera share eye ridges that are positioned parallel to the frontal and lateral border of the head, prominent genal spines that are a smooth continuation of the lateral margin of the head, a prothorax of 6 segments, with the 5th and 6th merged and carrying large trailing spines. Both genera have in adulthood a highly variable but large number of segments of the opistothorax, although the largest number found in ''B. dailyi'' with 97 is much larger than in ''Emuella'' (52).<ref name='Paterson&Edgecombe'/>

<!--- ==Ecology== --->
==References==
{{Reflist}}

==Further information==
{{Refbegin}}
* {{cite book
 | chapter = Burgess Shale-type Localities: The global picture
 | author = Hagadorn, J.W.
 | editor = Bottjer, D.J. |editor2=W. Etter |editor3=J.W. Hagadorn |editor4=C.M. Tang
 | title=Exceptional Fossil Preservation -- A Unique View on the Evolution of Marine Life
 | publisher=Columbia University Press 
 | year=2002
 | isbn =0231102542
 }}
* {{cite web
 |author1=Greg Edgecombe  |author2=the Australian Museum 
  |name-list-style=amp | title=Australian Trilobites: A Species List and Bibliography
 | url=http://www.austmus.gov.au/palaeontology/research/trilobites03.htm? | archive-url=https://web.archive.org/web/20080428044233/https://www.austmus.gov.au/palaeontology/research/trilobites03.htm
| archive-date=April 28, 2008
| url-status=dead
 }}
* {{cite web
 | author=Sam Gon III
 | title=Order Redlichiida
 | url=https://www.trilobites.info/ordredlichiida.htm
 | archive-url=https://web.archive.org/web/20231022014740/http://www.trilobites.info/ordredlichiida.htm
 | archive-date=October 22, 2023
 | url-status=live
 }}
* {{cite journal
 | author=Nedin, C.
 | title=The Emu Bay Shale, a Lower Cambrian fossil Lagerstätte, Kangaroo Island, South Australia 
 | journal=Memoirs of the Association of Australasian Palaeontologists
 | year=1995 | volume=18 | pages=31–40
 }}
* {{cite web
 |author      = Simpson, Dave
 |title       = Trilobites of South Australia
 |url         = http://info.esc.net.au/~dasimpson/index.htm
 |access-date  = November 4, 2023
 |url-status     = dead
 |archive-url  = https://web.archive.org/web/20060219192556/http://info.esc.net.au/~dasimpson/index.htm
 |archive-date = February 19, 2006
}}
{{Refend}}

{{Taxonbar|from=Q5374867}}

Category:Cambrian trilobites
Category:Emuelloidea
Category:Trilobites of Oceania
Category:Redlichiida genera
Category:Fossil taxa described in 1970
Category:Emu Bay Shale
Category:Cambrian genus extinctions

{{redlichiida-stub}}

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Adapted from the Wikipedia article [Emuella](https://en.wikipedia.org/wiki/Emuella) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Emuella?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.