AngelinaSalter, 1859, [1] is a genus of ptychopariidtrilobite belonging to the Family Olenidae, Suborder olenina. It lived during the Tremadocian 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, Central and South America. It differs from most other Triarthrinae in being larger, with a relatively narrow glabella, 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. [2]
The type species, Angelina sedgwickii Salter, 1859, was named for the Revd. Adam Sedgwick, the 19th Century Cambridge geologist who coined the term "Cambrian". This is the classic trilobite species found at Y Garth Hill, near Porthmadog, North West Wales (grid referenceSH 598 394), and which has been collected for well over 100 years. This historic locality is described in Howells and Smith (1997) [3] and Rushton et al. (2000, p.111). [4] 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.
Fossils of Angelina have been found in Argentina, Bolivia, Mexico, [5] North West Wales and Shropshire, England.
Galleryedit
Angelina sedgwickii from the Tremadocian of North Wales.
Referencesedit
^ SALTER, J. W., 1859. In Murchison, R. I., Siluria (3rd edition). John Murray, London. xix + 592 pp.
^ MOORE, R. C. (1959). Arthropoda I - Arthropoda General Features, Proarthropoda, Euarthropoda General Features, Trilobitomorpha. Treatise on Invertebrate Paleontology. Vol. Part O. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. pp. 1–560. ISBN0-8137-3015-5.
^ HOWELLS, M. F. and SMITH M. 1997. The geology of the country around Snowdon. Memoir of the British Geological Survey, Sheet 119 (England and Wales) x + 104 pp.
^ 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. [dated 1999].
angelina, trilobite, angelina, salter, 1859, genus, ptychopariid, trilobite, belonging, family, olenidae, suborder, olenina, lived, during, tremadocian, stage, lowermost, standard, worldwide, divisions, forming, lower, ordovician, series, lowest, seven, stages. Angelina Salter 1859 1 is a genus of ptychopariid trilobite belonging to the Family Olenidae Suborder olenina It lived during the Tremadocian 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 Central and South America It differs from most other Triarthrinae in being larger with a relatively narrow glabella 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 2 AngelinaTemporal range Early Ordovician 488 478 Ma PreꞒ Ꞓ O S D C P T J K Pg N Angelina sedgwickii Salter 1859 Coin diameter 23 4mm Scientific classification Kingdom Animalia Phylum Arthropoda Class Trilobita Order Ptychopariida Suborder Olenina Family Olenidae Subfamily Triarthrinae Genus AngelinaSalter 1859 Species A sedgwickii Salter 1859 Type A hyeronimiA kayseriA punctolineataA spinosa Synonyms Keidelaspis The type species Angelina sedgwickii Salter 1859 was named for the Revd Adam Sedgwick the 19th Century Cambridge geologist who coined the term Cambrian This is the classic trilobite species found at Y Garth Hill near Porthmadog North West Wales grid reference SH 598 394 and which has been collected for well over 100 years This historic locality is described in Howells and Smith 1997 3 and Rushton et al 2000 p 111 4 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 Contents 1 Species 2 Distribution 3 Gallery 4 ReferencesSpecies editAngelina sedgwickii Type species Angelina hyeronimi Angelina kayseri Angelina punctolineata Angelina spinosaDistribution editFossils of Angelina have been found in Argentina Bolivia Mexico 5 North West Wales and Shropshire England Gallery edit nbsp Angelina sedgwickii from the Tremadocian of North Wales References edit SALTER J W 1859 In Murchison R I Siluria 3rd edition John Murray London xix 592 pp MOORE R C 1959 Arthropoda I Arthropoda General Features Proarthropoda Euarthropoda General Features Trilobitomorpha Treatise on Invertebrate Paleontology Vol Part O Boulder Colorado Lawrence Kansas Geological Society of America University of Kansas Press pp 1 560 ISBN 0 8137 3015 5 HOWELLS M F and SMITH M 1997 The geology of the country around Snowdon Memoir of the British Geological Survey Sheet 119 England and Wales x 104 pp 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 dated 1999 Angelina at Fossilworks org nbsp This Ptychopariida related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Angelina trilobite amp oldid 1060812709, wikipedia, wiki, book, books, library,
