Runcinodiscus Rushton (in Bassett et al. 1976, p. 636-7) [1] is a genus of Lower Cambrian Eodiscinid trilobite belonging to the family Weymouthiidae (Kobayashi 1943),[2] Order Agnostida (Salter 1864).[3]
By Monotypy and original designation, Runcinodiscus index Rushton (in Bassett et al. 1976). Holotype is A 15360 in the collection of the Sedgwick Museum of Earth Sciences, University of Cambridge.
Locality and ageedit
The Type specimen (Cobbold, 1931) was collected from the Protolenus Limestone (Ac5) [Comley Series], 180m south of Comley Quarry, near Church Stretton, Shropshire, England - grid referenceSO 4849 9625 according to Morris (1988, p.205).[4]
Remarksedit
Fletcher & Theokritoff (2008) [5] designated Shaw’s (1950, pl. 79, fig. 24) [6] specimen of “ Weymouthia nobilis (Ford, 1872)” [7] as the holotype of a new species, Serrodiscus weymouthioides, and considered Runcinodiscus Rushton (in Bassett et al., 1976) [= ?Weymouthia nobilis (Ford, 1872)] to be a junior synonym of Serrodiscus; Rushton (1976) had previously regarded Weymouthia and Runcinodiscus as closely allied with Serrodiscus. Weymouthia nobilis (Ford 1872), first described from the Taconic region of New York State, was also recorded by Cobbold (1931) from the Protolenus Limestone (Ac5) [Protolenid-Strenuellid Zone] at Comley, Shropshire, England,[8] but Rushton (in Bassett et al., 1976, p. 637) showed that the English specimens are specifically distinct from W. nobilis as described by Ford (1872) and, with some reservation, erected new genus and species, Runcinodiscus index.
Runcinodiscus cf. index Rushton, described originally by Kiær (1917) as Weymouthia nobilis,[9] was recovered from the Lower Cambrian Holmia Shale (Holmia Kjerulfi Assemblage-zone) at Tømten, close to Lake Mjøsa, Southeast Norway (Ahlberg, 1983, p. 289, fig. 1).[10]
^KOBAYASHI T. 1943. Brief notes on the Eodiscids 1, their classification with a description of a new species and a new variety, Proceedings of the Imperial Academy, Tokyo, Volume 19, pp. 37-42.
^SALTER, J. W. 1864: On some new fossils from the Lingula - flags of Wales. Quarterly Journal of the Geological Society of London, 20, 233–241.
^ MORRIS, S. F. 1988. A review of British trilobites, including a synoptic revision of Salter's monograph. Palaeontogr. Soc. (Monogr.), 1-316. pp. 26, 255.
^FLETCHER, T. P. & THEOKRITOFF, G., 2008. The Early Cambrian of eastern Massachusetts. Northeastern Geology and Environmental Science, 30, 301-329.
^SHAW, A. B., 1950. A revision of several Early Cambrian trilobites from eastern Massachusetts. Journal of Paleontology, 24, 577-590.
^FORD, S. W., 1872. Descriptions of some new species of primordial fossils. American Journal of Science, Series 3, 3, 419-422.
^COBBOLD, E. S. 1931. Additional fossils from the Cambrian rocks of Comley, Shropshire. Q. J. Geo/. Soc. Lond.87, 459 - 511.
^KIÆR, J. 1917. The Lower Cambrian Holmia fauna at Tømten in Norway. Skr. Nor. Videnskapsselsk., l. Mat.-Naturvidensk. Kl. 1916, (10), 140 pp.
^AHLBERG, P. 1983. Redescription of a Lower Cambrian eodiscid trilobites from Norway. Norsk Geologisk Tidsskrift, Vol. 63, pp. 289 - 290. Oslo.
May 11, 2024
runcinodiscus, rushton, bassett, 1976, genus, lower, cambrian, eodiscinid, trilobite, belonging, family, weymouthiidae, kobayashi, 1943, order, agnostida, salter, 1864, temporal, range, late, botomian, scientific, classification, kingdom, animalia, phylum, art. Runcinodiscus Rushton in Bassett et al 1976 p 636 7 1 is a genus of Lower Cambrian Eodiscinid trilobite belonging to the family Weymouthiidae Kobayashi 1943 2 Order Agnostida Salter 1864 3 RuncinodiscusTemporal range Late Botomian Scientific classification Kingdom Animalia Phylum Arthropoda Class Trilobita Order Agnostida Suborder Eodiscina Superfamily Eodiscoidea Family Weymouthiidae Genus RuncinodiscusRushton 1976 species R indexR cf index Contents 1 Type Species 2 Locality and age 3 Remarks 4 ReferencesType Species editBy Monotypy and original designation Runcinodiscus index Rushton in Bassett et al 1976 Holotype is A 15360 in the collection of the Sedgwick Museum of Earth Sciences University of Cambridge Locality and age editThe Type specimen Cobbold 1931 was collected from the Protolenus Limestone Ac5 Comley Series 180m south of Comley Quarry near Church Stretton Shropshire England grid reference SO 4849 9625 according to Morris 1988 p 205 4 Remarks editFletcher amp Theokritoff 2008 5 designated Shaw s 1950 pl 79 fig 24 6 specimen of Weymouthia nobilis Ford 1872 7 as the holotype of a new species Serrodiscus weymouthioides and considered Runcinodiscus Rushton in Bassett et al 1976 Weymouthia nobilis Ford 1872 to be a junior synonym of Serrodiscus Rushton 1976 had previously regarded Weymouthia and Runcinodiscus as closely allied with Serrodiscus Weymouthia nobilis Ford 1872 first described from the Taconic region of New York State was also recorded by Cobbold 1931 from the Protolenus Limestone Ac5 Protolenid Strenuellid Zone at Comley Shropshire England 8 but Rushton in Bassett et al 1976 p 637 showed that the English specimens are specifically distinct from W nobilis as described by Ford 1872 and with some reservation erected new genus and species Runcinodiscus index Runcinodiscus cf index Rushton described originally by Kiaer 1917 as Weymouthia nobilis 9 was recovered from the Lower Cambrian Holmia Shale Holmia Kjerulfi Assemblage zone at Tomten close to Lake Mjosa Southeast Norway Ahlberg 1983 p 289 fig 1 10 References edit BASSETT M G OWENS R M and RUSHTON A W A 1976 Lower Cambrian fossils from the Hell s Mouth Grits Journal of the Geological Society 132 6 623 644 http pubs geoscienceworld org jgs article pdf 132 6 623 4885552 gsjgs 132 6 0623 pdf KOBAYASHI T 1943 Brief notes on the Eodiscids 1 their classification with a description of a new species and a new variety Proceedings of the Imperial Academy Tokyo Volume 19 pp 37 42 SALTER J W 1864 On some new fossils from the Lingula flags of Wales Quarterly Journal of the Geological Society of London 20 233 241 MORRIS S F 1988 A review of British trilobites including a synoptic revision of Salter s monograph Palaeontogr Soc Monogr 1 316 pp 26 255 FLETCHER T P amp THEOKRITOFF G 2008 The Early Cambrian of eastern Massachusetts Northeastern Geology and Environmental Science 30 301 329 SHAW A B 1950 A revision of several Early Cambrian trilobites from eastern Massachusetts Journal of Paleontology 24 577 590 FORD S W 1872 Descriptions of some new species of primordial fossils American Journal of Science Series 3 3 419 422 COBBOLD E S 1931 Additional fossils from the Cambrian rocks of Comley Shropshire Q J Geo Soc Lond 87 459 511 KIAER J 1917 The Lower Cambrian Holmia fauna at Tomten in Norway Skr Nor Videnskapsselsk l Mat Naturvidensk Kl 1916 10 140 pp AHLBERG P 1983 Redescription of a Lower Cambrian eodiscid trilobites from Norway Norsk Geologisk Tidsskrift Vol 63 pp 289 290 Oslo Retrieved from https en wikipedia org w index php title Runcinodiscus amp oldid 1163315148, wikipedia, wiki, book, books, library,
