Acmarhachis

Acmarhachis
Temporal range: Upper Cambrian
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Agnostida
Suborder:
Agnostoidea
Family:
Agnostidae
Subfamily:
incertae subfamiliae
Genus:
Acmarhachis

Resser, 1938
Species
  • A. typicalis Resser, 1938 (type)
  • A. acuta (Kobayashi, 1938)
  • A. anhuiensis (Qiu, 1983) synonym Wanagnostus anhuiensis
  • A. apicula Öpik, 1967 synonym Oxyagnostus apicula
  • A. elegans (Lermontova, 1940)[1] synonym Cyclagnostus elegans Lerm., 1940
  • A. karatauensis Ergaliev, 1980
  • A. longispinus Ergaliev, 1980
  • A. punctatus Ergaliev, 1980
  • A. whittingtoni Westrop & Eoff, 2012[2]
Synonyms

Cyclagnostus, Wanagnostus

Acmarhachis is a genus of trilobite in the order Agnostida, which lived in what are now Australia (Queensland, Tasmania), Canada (British Columbia, Newfoundland, Northwest Territories), China (Anhui), Kazakhstan, Russia (Kharaulakh), and the US (Alaska, Alabama, Nevada, Maryland, Vermont). It was described by Resser in 1938, and the type species is Acmarhachis typicalis.[3]

Distribution

  • A. typicalis occurs in the Cambrian of Kazakhstan (Kyrshabakty River, Lejopyge laevigata-trilobite zone, Zhumabai Formation, Paibian and Cambrian Stage 9, 43.5° N, 70.0° E).[4]
  • A. whittingtoni is known from the Upper Cambrian of Canada (Hickey Cove, Dunderbergia-trilobite zone, Downes Point Member, Shallow Bay Formation, Paibian, Newfoundland, 49.8° N, 57.9° W).[5]

Description

Like all Agnostida, Acmarhachis is diminutive and the headshield (or cephalon) and tailshield (or pygidium) are of approximately the same size (or isopygous) and outline. As in all Agnostina, Acmarhachis has two thorax segments. When Agnostina are enrolled, a tiny opening between the cephalon and the thorax becomes visible (the cephalothoracic aperture) that uniquely distinguishes this group from the Eodiscina. A feature shared with all Agnostoidea is that the frontal lobe of the central raised area of the cephalon (or glabella) is not laterally expanded compared to the backward lobe, like in the Condylopygoidea. In Acmarhachis the furrow at midline between the front of the glabella and the border is weak or absent. The glabella has a long ogival to subquadrate front lobe, and the furrow defining it at its back is straight. The back lobe of the glabella is accompanied by two triangular basal lobes of moderate to large size. On the pygidium the axis or rhachis reaches the border. It is divided along its length in three lobes. It is shaped a bit like an amphora, the back pointed and strongly constricted across the middle lobe. The middle lobe also carries a node where it contacts the posterior lobe.[2]

References

  1. ^ Arthropoda - Klass trilobity (Class Trilobita). EV Lermontova, Atlas of the Leading Forms of the Fossil Faunas of the USSR, 1940
  2. ^ a b Whittington, H. B. et al. Part O, Treatise on Invertebrate Paleontology. Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. 1997
  3. ^ Available Generic Names for Trilobites P.A. Jell and J.M. Adrain.
  4. ^ Ergaliev, G.K.; Ergaliev, F.G. (2008). Agnostidy srednego i verkhnego Kembriya Aksayskogo Gosudarstvennogo Geologicheskogo Zakaznika v yushnom Kazakhstane (Kyrshabakty, Malyy Karatau) [Middle and Upper Cambrian Agnostida from the Aksai National Geological Reserve in southern Kazakhstan (Kyrshabakty River, Malyy Karatau Range)]. pp. 1–359. cited in Paleobiological Database. "Acmarhachis whittingtoni". Retrieved 17 December 2021.
  5. ^ Westrop, S.R.; Eoff, .J.D. (2012). "Late Cambrian (Furongian; Paibian, Steptoean) agnostoid arthropods from the Cow Head Group, western Newfoundland". Journal of Paleontology. 86 (2): 201–237. Bibcode:2012JPal...86..201W. doi:10.1666/11-034.1. S2CID 128401877. cited in Paleobiological Database. "Acmarhachis whittingtoni". Retrieved 17 December 2021.


Stub icon

This Agnostida-related article is a stub. You can help Wikipedia by expanding it.

Read other articles:

Enrique B. Magalona

Peta menunjukkan lokasi Enrique B. Magalona Enrique B. Magalona adalah munisipalitas yang terletak di provinsi Negros Occidental, Filipina. Pada tahun 2010, munisipalitas ini memiliki populasi sebesar 57.424 jiwa dan 11.485 rumah tangga. Pembagian wilayah Secara administratif Enrique B. Magalona terbagi menjadi 23 barangay, yaitu: Alacaygan Alicante Poblacion I (Barangay 1) Poblacion II (Barangay 2) Poblacion III (Barangay 3) Batea Consing Cudangdang Damgo Gahit Canlusong Latasan Madalag Mant...

 

Hasan Din

Hasan DinLahir1905Padang, Hindia BelandaMeninggal1974 (umur 68/69)MakamTaman Pemakaman Umum Karet BivakKebangsaanIndonesiaPekerjaanPengusahaSuami/istriSiti Chadijah dan 3 lainnyaAnakFatmawati Hildawati Hasan Din (lahir di Padang, Sumatera Barat, tahun 1905 - wafat 1974) adalah seorang pengusaha dan tokoh Muhammadiyah di Bengkulu.[1] Dia merupakan ayah dari Fatmawati, ibu negara Republik Indonesia yang pertama. Kehidupan Hasan merupakan seorang pengusaha Minangkabau yang aktif melakuk...

 

Spine (zoology)

This article is about needle-like growths in animals. For backbone, see Vertebral column. For other uses, see Spine (disambiguation). In a zoological context, spines are hard, needle-like anatomical structures found in both vertebrate and invertebrate species. The spines of most spiny mammals are modified hairs, with a spongy center covered in a thick, hard layer of keratin and a sharp, sometimes barbed tip. Occurrence Mammals The defensive spines on a porcupine Spines in mammals include the ...

Grand Orient de France

Grand Orient de France GODF Grand Orient de France (GODF) adalah yang tertua dan terbesar dari beberapa organisasi Masonik yang berbasis di Perancis dan yang tertua di benua Eropa (karena organisasi ini dibentuk dari Grand Lodge yang lebih tua di Perancis pada tahun 1773[1] dan secara singkat menyerap bagian belakang organisasi yang lebih tua pada tahun 1799, sehingga dapat diketahui tanggal pendiriannya hingga 1728 atau 1733). Grand Orient de France umumnya dianggap sebagai pondok in...

 

Andreas Bernard

Italian ice hockey player Ice hockey player Andreas Bernard Andreas BernardBorn (1990-06-09) 9 June 1990 (age 33)Neumarkt, ItalyHeight 6 ft 0 in (183 cm)Weight 200 lb (91 kg; 14 st 4 lb)Position GoaltenderCatches LeftICEHL teamFormer teams HC PustertalSaiPaÄssätVäsby IKEC VSVNational team  ItalyPlaying career 2008–present Andreas Bernard (born 9 June 1990) is an Italian professional ice hockey goaltender who currently plays for HC Pusterta...

 

My Country: The New Age

My Country: The New AgePoster promosiHangul나의 나라 GenreSejarahRomanMelodramaDitulis olehChae Seung-daeSutradaraKim Jin-wonPemeranYang Se-jongWoo Do-hwanKim Seol-hyunJang HyukNegara asalKorea SelatanBahasa asliKoreaJmlh. episode16ProduksiProduser eksekutifOh Hwan-minProduserPark Woo-lamKim Ji-wooDurasi70 menitRumah produksiCelltrion EntertainmentMy Country SPCDistributorJTBCRilis asliJaringanJTBC, NetflixFormat gambar1080i (HDTV)Format audioDolby DigitalRilis4 Oktober (2019-10-04)...

1807 Massachusetts gubernatorial election

Governor's election, United States 1807 Massachusetts gubernatorial election ← 1806 April 6, 1807 1808 →   Nominee James Sullivan Caleb Strong Party Democratic-Republican Federalist Popular vote 41,954 39,224 Percentage 51.47% 48.12% Governor before election Caleb Strong Federalist Elected Governor James Sullivan Democratic-Republican Elections in Massachusetts General 1942 1944 1946 1948 1950 1952 1954 1956 1958 1960 1962 1964 1966 1970 1974 1978 1982 1986 199...

 

Payré

Pour les articles homonymes, voir Payre (homonymie). Cet article est une ébauche concernant une commune de la Vienne. Vous pouvez partager vos connaissances en l’améliorant (comment ?). Le bandeau {{ébauche}} peut être enlevé et l’article évalué comme étant au stade « Bon début » quand il comporte assez de renseignements encyclopédiques concernant la commune. Si vous avez un doute, l’atelier de lecture du projet Communes de France est à votre disposition pou...

 

Diapason

Cet article concerne l'outil de musicien. Pour les autres significations, voir Diapason (homonymie). Diapason Diapason à branches carrées à 440 Hz. Échantillon sonore Diapason à 440 Hz. modifier  En musique, le diapason est à la fois un instrument matériel produisant un son de référence et cette référence elle-même : un son dont la hauteur est dans presque tous les cas un la (corde à vide du violon). Cette référence permet aux musiciens d'accorder ensem...

Vainqueurs du Concours Eurovision de la chanson

Carte visualisant le nombre de victoires par pays. Le Concours Eurovision de la chanson est un événement annuel organisé par l’UER, l’Union européenne de radio-télévision. Il réunit les membres de l’Union dans le cadre d’une compétition musicale, diffusée en direct et en simultané par tous les pays participants. Depuis 1956, le concours (appelé plus communément Eurovision) s’est tenu chaque année, sauf en 2020, à cause de la pandémie de COVID-19[1]. Jusqu'à présent,...

 

112th Air Refueling Group

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (December 2012) (Learn how and when to remove this message) 112th Air Refueling Group112th Air Refueling Group emblemActive1942–1993CountryUnited StatesBranchAir National GuardTypeGroupRoleAerial RefuelingPart ofMississippi Air National GuardGarrison/HQPittsburgh IAP Air...

 

Thaler

Large silver coin used in 16th- to 19th-century Europe For other uses, see Thaler (disambiguation). Four thalers and one double thaler, compared to a U.S. quarter (bottom center): Clockwise from top left: Saxe-Altenburg 1616 (reverse), Saxony 1592, Austria 1701 (obverse), Saxony 1592 (obverse), Center: double thaler, Austria 1635 (obverse). A thaler or taler (/ˈtɑːlər/ TAH-lər; German: Taler [ˈtaːlɐ], previously spelled Thaler) is one of the large silver coins minted in the st...

Outlaws of Stampede Pass

1943 film directed by Wallace Fox Outlaws of Stampede PassTheatrical release posterDirected byWallace FoxScreenplay byAdele BuffingtonStory byJohnston McCulleyProduced byScott R. DunlapStarringJohnny Mack BrownRaymond HattonEllen HallJohn DawsonHarry WoodsCharles KingCinematographyMarcel Le PicardEdited byCarl PiersonProductioncompanyMonogram PicturesDistributed byMonogram PicturesRelease date October 15, 1943 (1943-10-15) Running time58 minutesCountryUnited StatesLanguageEngli...

 

Bertrand Delanoë

Bertrand Delanoë Wali kota ParisMasa jabatan25 Maret 2001 – 5 April 2014PendahuluJean TiberiPenggantiAnne HidalgoSenator Prancis dari ParisMasa jabatan24 September 1995 – 27 Maret 2001Anggota Majelis Majelis Nasional Prancisdapil Paris (Konstituensi ke-26)Masa jabatan21 Juni 1981 – 1 April 1986PendahuluJoël Le TacPenggantiAlain Juppé Informasi pribadiLahir30 Mei 1950 (umur 73)Tunis, Tunisia Prancis Kebangsaan PrancisPartai politikPartai Sosialis P...

 

Spencer Horatio Walpole

British Conservative politician The Right HonourableSpencer Horatio WalpoleQCHome SecretaryIn office6 July 1866 – 17 May 1867Prime MinisterThe Earl of DerbyPreceded bySir George GreySucceeded byGathorne HardyIn office26 February 1858 – 3 March 1859Prime MinisterThe Earl of DerbyPreceded bySir George GreySucceeded byT. H. S. Sotheron-EstcourtIn office27 February 1852 – 19 December 1852Prime MinisterThe Earl of DerbyPreceded bySir George GreySucceeded byThe Visc...

History of COVID-19 vaccine development

Scientific work to develop a vaccine for COVID-19 COVID‑19 vaccine research samples in a NIAID lab freezer (30 January 2020) Part of a series on theCOVID-19 pandemicScientifically accurate atomic model of the external structure of SARS-CoV-2. Each ball is an atom. COVID-19 (disease) SARS-CoV-2 (virus) Cases Deaths Timeline 2019 2020 January responses February responses March responses April responses May responses June responses July responses August responses September responses October re...

 

LimeWire

LimeWire LimeWire PRO 5.5.14TipeBitTorrent client (en) Versi pertama29 Mei 2000; 24 tahun lalu (2000-05-29)Versi stabil 5.6.1 (7 Mei 2010) 5.5.16 (26 Oktober 2010) LisensiGNU General Public LicenseBahasaDaftar bahasa 31 languages Karakteristik teknisPlatformMesin Virtual Java Bahasa pemrogramanJava Format berkasDaftarLimeWire theme (en) Sunting di Wikidata  • Sunting kotak info • L • BBantuan penggunaan templat ini LimeWire adalah sebuah program free peer-to-peer fil...

 

Marguerite Bertsch

Marguerite Bertsch Marguerite Bertsch (New York, 14 dicembre 1889 – Houston, 11 agosto 1967) è stata una sceneggiatrice e regista statunitense. Indice 1 Carriera 2 Filmografia 2.1 Sceneggiatrice 2.2 Regista 3 Note 4 Collegamenti esterni Carriera La Bertsch diresse quattro film, ed il suo nome appare in 48 pellicole come soggettista o sceneggiatrice. Nella sua carriera, collaborò spesso con Ralph Ince, William Humphrey, Wilfrid North e Theodore Marston. Filmografia La filmografia è comple...

Manvini Bhavai

1947 Gujarati novel by Pannalal Patel Manvini Bhavai AuthorPannalal PatelOriginal titleમાનવીની ભવાઈTranslatorV. Y KantakLanguageGujaratiGenreNovelPublisherSahitya Akademi (Eng. ed.)Publication date1947Publication placeIndiaPublished in English1995Media typePrintDewey Decimal891.473LC ClassPK1859.P28 M3 Manvi Ni Bhavai (English: Endurance: A Droll Saga) is a 1947 Gujarati novel written by Pannalal Patel. It is set in the period of the Indian famine of ...

 

معركة غروتسكا

يفتقر محتوى هذه المقالة إلى الاستشهاد بمصادر. فضلاً، ساهم في تطوير هذه المقالة من خلال إضافة مصادر موثوق بها. أي معلومات غير موثقة يمكن التشكيك بها وإزالتها. (ديسمبر 2019) معركة غروتسكا جزء من الحروب العثمانية الهابسبورغية   معلومات عامة التاريخ 21-22 يوليو، 1739م الموقع غروتس�...