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.[1]
S. chuanxiensis (Li & Xiao, 1984) (synonymMicroparia (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 Petrunina, 1975 is present in the Upper Ordovician of China (?Ashgill, Kielanella-Tretaspis Beds of the Ulugtay District, south Tien Shan).
S. felix Koroleva, 1967 (type) has been collected from the Middle Ordovician of Kazakhstan (Caradoc, Nemagraptus gracilis Zone, Saga Formation, Saga River section, Stepnyak district).
S. glans Fortey & Owens, 1987 was excavated from the Upper Ordovician of the United Kingdom (late Arenig, Pontyfenni Formation, South Wales).
S. heterocyclopygeformis Koroleva, 1982 is known from the Middle Ordovician of northern Kazakhstan (Caradoc).
S. modica Koroleva, 1967 is known from the Middle Ordovician of Kazakhstan (Caradoc, Nemagraptus gracilis Zone, Saga Formation, Saga River section, Stepnyak district).
S. novakellaformis Koroleva, 1982 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).[1]
S. zhuyegouensis Koroleva, 1982 occurs at the Middle Ordovician of China (late Caradoc, Dangmengou, Ningqiang Northwestern Sichuan).
Descriptionedit
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.[1]
Differences with related generaedit
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.[1]
Referencesedit
^ abcdZhou Zhiyi; Zhou Zhiqiang (2007). "The Late Ordovician cyclopygid trilobite Sagavia Koroleva, 1967, from the Pagoda Formation of southwestern Shaanxi, China" (PDF). Memoirs of the Association of Australasian Palaeontologists. 34: 181–187. Retrieved 18 June 2013.
This Asaphida-related article is a stub. You can help Wikipedia by expanding it.
sagavia, genus, trilobites, that, lived, during, middle, upper, ordovician, what, northwest, southeast, china, north, kazakhstan, wales, typical, cyclopygid, that, distinguished, large, separate, eyes, elongated, glabella, five, thorax, segments, pygidium, wit. 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 1 SagaviaTemporal range Middle and Upper Ordovician PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Domain Eukaryota Kingdom Animalia Phylum Arthropoda Class Trilobita Order Asaphida Family Cyclopygidae Genus SagaviaKoroleva 1967 Species See text Contents 1 Species and distribution 2 Description 2 1 Differences with related genera 3 ReferencesSpecies and distribution editS chuanxiensis Li amp Xiao 1984 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 Petrunina 1975 is present in the Upper Ordovician of China Ashgill Kielanella Tretaspis Beds of the Ulugtay District south Tien Shan S felix Koroleva 1967 type has been collected from the Middle Ordovician of Kazakhstan Caradoc Nemagraptus gracilis Zone Saga Formation Saga River section Stepnyak district S glans Fortey amp Owens 1987 was excavated from the Upper Ordovician of the United Kingdom late Arenig Pontyfenni Formation South Wales S heterocyclopygeformis Koroleva 1982 is known from the Middle Ordovician of northern Kazakhstan Caradoc S modica Koroleva 1967 is known from the Middle Ordovician of Kazakhstan Caradoc Nemagraptus gracilis Zone Saga Formation Saga River section Stepnyak district S novakellaformis Koroleva 1982 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 1 S zhuyegouensis Koroleva 1982 occurs at the Middle Ordovician of China late Caradoc Dangmengou Ningqiang Northwestern Sichuan Description editThe 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 1 Differences with related genera edit 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 1 References edit a b c d Zhou Zhiyi Zhou Zhiqiang 2007 The Late Ordovician cyclopygid trilobite Sagavia Koroleva 1967 from the Pagoda Formation of southwestern Shaanxi China PDF Memoirs of the Association of Australasian Palaeontologists 34 181 187 Retrieved 18 June 2013 nbsp This Asaphida related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Sagavia amp oldid 1082694341, wikipedia, wiki, book, books, library,
