{{Short description|Extinct genus of trilobites}} {{Automatic taxobox | fossil_range = {{fossil_range| 470|444|Middle and Upper Ordovician}} | image = | image_caption = | taxon = Sagavia | authority = Koroleva, 1967 | subdivision_ranks = Species | subdivision = See text }}
'''''Sagavia''''' is a genus of trilobites that lived during the Middle and Upper Ordovician in what are now Northwest and Southeast China, North Kazakhstan and Wales. It is a typical cyclopygid that can be distinguished by its large but separate eyes, elongated glabella, five thorax segments and a pygidium with clearly defined axis and border.<ref name='Z&Z'>{{cite journal|author1= Zhou Zhiyi|author2= Zhou Zhiqiang|year= 2007|title= The Late Ordovician cyclopygid trilobite ''Sagavia'' Koroleva, 1967, from the Pagoda Formation of southwestern Shaanxi, China|journal= Memoirs of the Association of Australasian Palaeontologists|volume= 34|pages= 181–187|url= http://159.226.74.248:8000/pagelinks/131880.pdf|access-date= 18 June 2013|archive-date= 19 May 2018|archive-url= https://web.archive.org/web/20180519034505/http://159.226.74.248:8000/pagelinks/131880.pdf|url-status= dead}}</ref>
== Species and distribution == * ''S. chuanxiensis'' <small>(Li & Xiao, 1984)</small> (synonym ''Microparia (Microparia) chuanxiensis'') is found in the Middle and Upper Ordovician of China (late Caradoc-Ashgill, top of the Pagoda Formation, limestone block in a Triassic melange accumulation at Shiqu; Yuanba, Hougou and Liangshan, Nanzheng; Dangmengou and Zhuyegou, Ningqiang; Qishuba and Gaoqiaogou, Mianxian; all Northwestern Sichuan). * ''S. elongata'' <small>Petrunina, 1975</small> is present in the Upper Ordovician of China (?Ashgill, ''Kielanella''-''Tretaspis'' Beds of the Ulugtay District, south Tien Shan). * ''S. felix'' <small>Koroleva, 1967 (type)</small> has been collected from the Middle Ordovician of Kazakhstan (Caradoc, ''Nemagraptus gracilis'' Zone, Saga Formation, Saga River section, Stepnyak district). * ''S. glans'' <small>Fortey & Owens, 1987</small> was excavated from the Upper Ordovician of the United Kingdom (late Arenig, Pontyfenni Formation, South Wales). * ''S. heterocyclopygeformis'' <small>Koroleva, 1982</small> is known from the Middle Ordovician of northern Kazakhstan (Caradoc). * ''S. modica'' <small> Koroleva, 1967</small> is known from the Middle Ordovician of Kazakhstan (Caradoc, ''Nemagraptus gracilis'' Zone, Saga Formation, Saga River section, Stepnyak district). * ''S. novakellaformis'' <small> Koroleva, 1982</small> occurs at the Koroleva from the Middle Ordovician of northern Kazakhstan (late Llanvirn?), and the United Kingdom (''Hustedograptus teretiusculus'' Biozone of the Llanfawn Mudstone Formation, central Wales).<ref name='Z&Z'/> * ''S. zhuyegouensis'' <small> Koroleva, 1982</small> occurs at the Middle Ordovician of China (late Caradoc, Dangmengou, Ningqiang Northwestern Sichuan).
== Description == The glabella of ''Sagavia'' is elongate with parallel sides or slightly converging towards the front. The large eyes are separated at the front by the glabella and the cephalic doublure. The rostral suture is vaulted upwards. It has a thorax of five segments. ''Sagavia'' has a pygidium with well a defined axis and border with clear furrows.<ref name='Z&Z'/>
=== Differences with related genera === * ''Sagavia'' is similar to ''Microparia'' but has a more elongate glabella and much better defined pygidial axis and border. * ''Heterocyclopyge'' also has a defined pygidial axis, a five-segmented thorax, and a defined pygidial border, but has a shorter glabella and the pygidial border and axis are poorly defined medially.<ref name='Z&Z'/>
== References == {{Reflist}}
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Category:Cyclopygidae Category:Asaphida genera Category:Ordovician trilobites Category:Fossils of China Category:Fossils of Kazakhstan Category:Fossils of Great Britain Category:Middle Ordovician first appearances Category:Late Ordovician extinctions Category:Nektonic trilobites
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