''Angelina'' Salter, 1859, is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of ptychopariid

trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...

belonging to the Family Olenidae, Suborder

olenina ''Olenina'' is an extinct suborder of the trilobite order Ptychopariida. Subdivisions *Superfamily Olenoidea **Family Ellipsocephaloididae **Family Olenidae Olenidae is a family of ptychopariid trilobites. Some genera, '' Balnibarbi'' and ...

. It lived during the

Tremadocian The Tremadocian is the lowest stage of Ordovician. Together with the later Floian Stage it forms the Lower Ordovician Epoch. The Tremadocian lasted from to million years ago. The base of the Tremadocian is defined as the first appearance of the ...

Stage, lowermost of the two standard worldwide divisions forming the Lower Ordovician Series and lowest of the seven stages within the Ordovician System. It encompasses all rocks formed during Tremadocian times, which spanned the interval between 485.4 million and 477.7 million years ago. Fossilized remains of ''Angelina'' are known from

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

, Central and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

. It differs from most other Triarthrinae in being larger, with a relatively narrow

glabella The glabella, in humans, is the area of skin between the eyebrows and above the nose. The term also refers to the underlying bone that is slightly depressed, and joins the two brow ridges. It is a cephalometric landmark that is just superior to ...

, the occipital ring poorly defined, and lateral glabellar furrows relatively obscure. Eyes are placed midlength that of the cephalon and the facial sutures converge on the front border at the midline. Species also have long genal spines. The type species, ''Angelina sedgwickii'' Salter, 1859, was named for the Revd. Adam Sedgwick, the 19th Century

Cambridge Cambridge ( ) is a university city and the county town in Cambridgeshire, England. It is located on the River Cam approximately north of London. As of the 2021 United Kingdom census, the population of Cambridge was 145,700. Cambridge bec ...

geologist who coined the term "Cambrian". This is the classic trilobite species found at Y Garth Hill, near

Porthmadog Porthmadog (; ), originally Portmadoc until 1974 and locally as "Port", is a Welsh coastal town and community in the Eifionydd area of Gwynedd and the historic county of Caernarfonshire. It lies east of Criccieth, south-west of Blaenau Ffest ...

North West Wales North West Wales ( cy, Gogledd-Orllewin Cymru) refers to an area or region of Wales, commonly defined as a grouping of the principal areas of Conwy County Borough, Gwynedd and the Isle of Anglesey in the north-west of the country. These princi ...

(), and which has been collected for well over 100 years. This historic locality is described in Howells and Smith (1997) and Rushton ''et al''. (2000, p.111). RUSHTON, A. W. A., OWEN, A. W., OWENS R. M. and PRIGMORE J. K. 2000. ''Cambrian to Ordovician stratigraphy'' Joint Nature Conservation Council Peterborough, xxi + 435 pp. ated 1999 It lies in the Upper Mudstone Member of the Dol-cyn-afon Formation (formerly Angelina sedgwickii'' Beds' or 'Garth Hill Beds' of the Tremadoc slate.

Species

* ''Angelina sedgwickii'' (Type species) * ''Angelina hyeronimi'' * ''Angelina kayseri'' * ''Angelina punctolineata'' * ''Angelina spinosa''

Distribution

Fossils of ''Angelina'' have been found in Argentina, Bolivia, Mexico, ''Angelina''
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.org North West Wales and Shropshire, England.

Gallery

File:Angelina sedgwicki 3.jpg, ''Angelina sedgwickii'' from the

of North Wales.

References

Olenina Ptychopariida genera Early Ordovician trilobites of Europe Ordovician trilobites of North America Ordovician Mexico Ordovician trilobites of South America Ordovician Argentina Ordovician Bolivia {{Ptychopariida-stub