Ellipsocephalus Zenker, 1833,[1] is a genus of blind Cambriantrilobite, comprising benthic species inhabiting deep, poorly lit or aphotic habitats.[2]E. hoffi is a common trilobite mainly from central Europe (Czech Republic).[3]
E. hoffi (Schlotheim, 1823) [4] occurs in the Middle Cambrian of the Czech Republic, Jince Formation, Ellipsocephalus hoffi–Paradoxides (Rejkocephalus)–Lingulella Biozone of Fatka & Szabad (2014).[5][6]
E. polytomus Linnarsson, 1877,[7] is widely distributed in the ‘Oelandicus Beds’ (Baltoparadoxides oelandicus Biosuperzone) of Sweden and found near Viken, Näkten lake, Närke and Jämtland. The species is also known from drill cores retrieved from the island of Gotland, Sweden (e.g., Ahlberg 1989).[8][9]
E. sanctacrucensis (Samsonowicz, 1959) [10][11] is known from the Middle Cambrian of Poland (Słowiec Sandstone Formation, Paradoxides insularis and P. pinus-zones, near Brzechów, Holy Cross Mountains).[12]
DescriptionEdit
Ellipsocephalus is approximately oval in shape and markedly convex. It has opistoparian facial sutures that are directed slightly outward from both front and back of the eyes[clarification needed]. The glabella has approximately parallel, slightly concave sides and is rounded frontally. Lateral furrows are indiscernible, as is the occipital ring. The palpebral lobes are not distinctly separated from the narrow occular ridges. The preglabellar field is somewhat inflated and librigenae are half as wide as the fixigenae. Some species have genal spines (as in E. sanctacrucensis), whereas in the most common species (E. hoffi) the genae lack spines and are only slightly angular posterolaterally. Ellipsocephalus has 12 thoracicsegments and the pygidium is 4× wider than long.[13]
BehaviourEdit
Ellipsocephalus and some other primitive micropygous Cambrian genera, such as Bailiella, enroll differently from other trilobites so that the posterior thorax segments and pygidium bend under the thorax. This is called "double enrollment".[13]
ReferencesEdit
^ZENKER, J. C., 1833. Beiträge zur Naturgesichte der Urwelt. Organische Reste (Petrefacten) aus der Altenbruger BraunkohlenFormation, dem Blankenburger Quadersandstein, Jenaischen bunten Sandstein und Böhmischen Uebergangsgebirge. Friedrich Mauke, Jena, 67
^SCHLOTHEIM, E.F., 1823. Nachträge zur Petrefactenkunde. Zw. Abteilung, Becker, Gotha, 114 pp.
^FATKA, O. & SZABAD, M., 2014. Biostratigraphy of Cambrian in the Příbram-Jince Basin (Barrandian area, Czech Republic). Bulletin of Geosciences, 88, 413–429.
^S.M. GON III. "Trilobites of the Jince Formation, Czech Republic". Retrieved 19 October 2012.
^LINNARSSON, G., 1877. Om faunan i lagren med Paradoxides ölandicus. Geologiska Föreningens i Stockholm Förhandlingar, 3, pp. 352 – 375
^AHLBERG, P., 1989. Cambrian stratigraphy of the När 1 deep well, Gotland. Geologiska Föreningens i Stockholm Förhandlingar, 111, 137–148.
^RUSHTON, A. W. A.; WEIDNER, T. (2007). "The Middle Cambrian paradoxidid trilobite Hydrocephalus from Jämtland, central Sweden" (PDF). Acta Geologica Polonica. 57 (4): 391–401. Retrieved 30 March 2013.
^SAMSONOWICZ, J. 1959a. On Strenuaeva from Lower Cambrian in Klimontów Anticlinorium. ´ Bulletin de l’Académie Polonaise des Sciences, Série des sciences chimiques, géologiques et géographiques. 7, pp. 521 – 4.
^SAMSONOWICZ, J. 1959b. On Strenuella and Germaropyge from the Lower Cambrian in the Klimontów Anticlinorium. Bulletin de l’Academie Polonaise des Sciences, Série des sciences chimiques, géologiques et géographiques, 7, 525 – 9.
^MASSIAK, M.; ŽYLIŃSKA, A. (1994). "Burgess shale-type fossils in Cambrian sandstones of the Holy Cross Mountains" (PDF). Acta Palaeontologica Polonica. 39 (4): 329–340.
^ abMOORE, 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.
SourcesEdit
Trilobite info (Sam Gon III)
External linksEdit
Trilobite info (Sam Gon III)
August 29, 2023
ellipsocephalus, confused, with, elliptocephala, zenker, 1833, genus, blind, cambrian, trilobite, comprising, benthic, species, inhabiting, deep, poorly, aphotic, habitats, hoffi, common, trilobite, mainly, from, central, europe, czech, republic, temporal, ran. Not to be confused with Elliptocephala Ellipsocephalus Zenker 1833 1 is a genus of blind Cambrian trilobite comprising benthic species inhabiting deep poorly lit or aphotic habitats 2 E hoffi is a common trilobite mainly from central Europe Czech Republic 3 EllipsocephalusTemporal range 510 499 Ma PreꞒ Ꞓ O S D C P T J K Pg N Middle CambrianEllipsocephalus hoffi Cambrian Jince Formation Czech RepublicScientific classificationKingdom AnimaliaPhylum ArthropodaClass TrilobitaOrder PtychopariidaSuborder EllipsocephaloideaFamily EllipsocephalidaeMatthew 1887Genus EllipsocephalusZenker 1833SpeciesE hoffi Schlotheim 1823 Trilobites hoffiE polytomus Linnarsson 1877 E sanctacrucensis Samsonovicz 1959 E vetustus Pompeckj 1895 Ellipsocephalus sanctacrucensisContents 1 Distribution 2 Description 3 Behaviour 4 References 5 Sources 6 External linksDistribution EditE hoffi Schlotheim 1823 4 occurs in the Middle Cambrian of the Czech Republic Jince Formation Ellipsocephalus hoffi Paradoxides Rejkocephalus Lingulella Biozone of Fatka amp Szabad 2014 5 6 E polytomus Linnarsson 1877 7 is widely distributed in the Oelandicus Beds Baltoparadoxides oelandicus Biosuperzone of Sweden and found near Viken Nakten lake Narke and Jamtland The species is also known from drill cores retrieved from the island of Gotland Sweden e g Ahlberg 1989 8 9 E sanctacrucensis Samsonowicz 1959 10 11 is known from the Middle Cambrian of Poland Slowiec Sandstone Formation Paradoxides insularis and P pinus zones near Brzechow Holy Cross Mountains 12 Description EditEllipsocephalus is approximately oval in shape and markedly convex It has opistoparian facial sutures that are directed slightly outward from both front and back of the eyes clarification needed The glabella has approximately parallel slightly concave sides and is rounded frontally Lateral furrows are indiscernible as is the occipital ring The palpebral lobes are not distinctly separated from the narrow occular ridges The preglabellar field is somewhat inflated and librigenae are half as wide as the fixigenae Some species have genal spines as in E sanctacrucensis whereas in the most common species E hoffi the genae lack spines and are only slightly angular posterolaterally Ellipsocephalus has 12 thoracic segments and the pygidium is 4 wider than long 13 Behaviour EditEllipsocephalus and some other primitive micropygous Cambrian genera such as Bailiella enroll differently from other trilobites so that the posterior thorax segments and pygidium bend under the thorax This is called double enrollment 13 References Edit ZENKER J C 1833 Beitrage zur Naturgesichte der Urwelt Organische Reste Petrefacten aus der Altenbruger BraunkohlenFormation dem Blankenburger Quadersandstein Jenaischen bunten Sandstein und Bohmischen Uebergangsgebirge Friedrich Mauke Jena 67 Trends in benthic trilobites Jince formation SCHLOTHEIM E F 1823 Nachtrage zur Petrefactenkunde Zw Abteilung Becker Gotha 114 pp FATKA O amp SZABAD M 2014 Biostratigraphy of Cambrian in the Pribram Jince Basin Barrandian area Czech Republic Bulletin of Geosciences 88 413 429 S M GON III Trilobites of the Jince Formation Czech Republic Retrieved 19 October 2012 LINNARSSON G 1877 Om faunan i lagren med Paradoxides olandicus Geologiska Foreningens i Stockholm Forhandlingar 3 pp 352 375 AHLBERG P 1989 Cambrian stratigraphy of the Nar 1 deep well Gotland Geologiska Foreningens i Stockholm Forhandlingar 111 137 148 RUSHTON A W A WEIDNER T 2007 The Middle Cambrian paradoxidid trilobite Hydrocephalus from Jamtland central Sweden PDF Acta Geologica Polonica 57 4 391 401 Retrieved 30 March 2013 SAMSONOWICZ J 1959a On Strenuaeva from Lower Cambrian in Klimontow Anticlinorium Bulletin de l Academie Polonaise des Sciences Serie des sciences chimiques geologiques et geographiques 7 pp 521 4 SAMSONOWICZ J 1959b On Strenuella and Germaropyge from the Lower Cambrian in the Klimontow Anticlinorium Bulletin de l Academie Polonaise des Sciences Serie des sciences chimiques geologiques et geographiques 7 525 9 MASSIAK M ZYLINSKA A 1994 Burgess shale type fossils in Cambrian sandstones of the Holy Cross Mountains PDF Acta Palaeontologica Polonica 39 4 329 340 a b 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 Sources EditTrilobite info Sam Gon III External links EditTrilobite info Sam Gon III Retrieved from https en wikipedia org w index php title Ellipsocephalus amp oldid 1140517636, wikipedia, wiki, book, books, library,
