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Acmarhachis

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Journal Article
Published: 01 March 2012
Journal of Paleontology (2012) 86 (2): 201–237.
... and correlates with the lower part of the Paibian and the basal Steptoean of North America. The “Innitagnostus” inexpectans Fauna is more diverse and likely correlates into part of the lower Steptoean Aphelaspis Zone of western North America. The youngest fauna, the Acmarhachis kindlei n. sp. Fauna, also...
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Species of <b>Acmarhachis</b> from Alabama and Maryland.  1–6 , <b>Acmarhachis</b> typica...
Published: 01 March 2012
F igure 13 Species of Acmarhachis from Alabama and Maryland. 1–6 , Acmarhachis typicalis Resser, 1938 , Nolichucky Formation between McCalla and Pleasant Hill, Alabama ( Resser, 1938 locality 56v): 1–3 , pygidium, USNM 94958 (holotype), dorsal, posterior and lateral views ( Resser, 1938 , pl
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<b>Acmarhachis</b> kindlei n. sp., Shallow Bay Formation, western Newfoundland.  1...
Published: 01 March 2012
F igure 15 Acmarhachis kindlei n. sp., Shallow Bay Formation, western Newfoundland. 1 , cephalon, GSC 134579, dorsal view; 2 , cephalon, GSC 134580, dorsal view; 3 , cephalon, GSC 134581, dorsal view; 4–6 , cephalon, GSC 134582, dorsal, anterior and lateral views; 7, cephalon, GSC 134583
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<b>Acmarhachis</b> kindlei n. sp., Shallow Bay Formation, western Newfoundland.  1...
Published: 01 March 2012
F igure 16 Acmarhachis kindlei n. sp., Shallow Bay Formation, western Newfoundland. 1, 2, pygidium, GSC 134590 (holotype), dorsal and posterior views; 3–5, pygidium, dorsal, posterior and lateral views; 6, 7, pygidium, GSC 134591, posterior and dorsal views; 8, 9, pygidium, GSC 134592
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Bivariate plots showing size-related variation in <b>Acmarhachis</b> kindlei n. sp...
Published: 01 March 2012
F igure 17 Bivariate plots showing size-related variation in Acmarhachis kindlei n. sp. 1 , maximum axis width-axis length ratio against pygidial length; 2 , maximum axis width-pygidial width ratio against pygidial length; 3 , axis length∶pygidial length ratio against pygidial width; 4
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<b>Acmarhachis</b> whittingtoni n. sp., Shallow Bay Formation, western Newfoundlan...
Published: 01 March 2012
F igure 18 Acmarhachis whittingtoni n. sp., Shallow Bay Formation, western Newfoundland. 1–3 , cephalon, GSC 134601, dorsal, lateral and anterior views; 4 , cephalon, GSC 134602, dorsal view; 5–7 , cephalon, GSC 134603 (holotype), anterior, lateral and dorsal views; 8 , cephalon, GSC 134604
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<b>Acmarhachis</b> from the Shallow Bay Formation, western Newfoundland.  1–8 , Ac...
Published: 01 March 2012
F igure 19 Acmarhachis from the Shallow Bay Formation, western Newfoundland. 1–8 , Acmarhachis whittingtoni n. sp.: 1–3 , pygidium, GSC 134607, dorsal, posterior and lateral views; 4–6 , pygidium, GSC 134608, lateral, posterior and dorsal views; 7 , pygidium, GSC 134609, dorsal view; 8
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Bivariate plot showing reduced major axis regression of acrolobe width and ...
Published: 01 March 2012
F igure 20 Bivariate plot showing reduced major axis regression of acrolobe width and maximum cephalic width (both measured along a line tangential to the anterior tip of the glabella) for species of Acmarhachis. Acmarhachis kindlei n. sp.: acrolobe width = 0.831, cephalic width = 0.04, standard
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Distribution of agnostoid species among boulders from the Shallow Bay Forma...
Published: 01 March 2012
166, HC 202 and CH57 comprise the Acmarhachis kindlei Fauna. Note that only a single agnostoid species, H . cf. H. obseus (Belt) occurs in more than one fauna.
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Figure  1 —Stratigraphic section of lower part of section N of the Rabbitke...
Published: 01 May 2002
and Robison, 2000 ; placed “ Pseudagnostus communis ” in synonymy with P. josepha — Peng and Robison, 2000 ; placed Acmarhachis acuta in synonymy with A. typicalis — Peng and Robison, 2000 ; placed Peratagnostus nobilis in synonymy with P. obsoletus — Peng and Robison, 2000 ; assigned Parabolina
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Agnostoids from McKay Group, west of Harrogate, British Columbia (“Paraboli...
Published: 01 March 2012
F igure 14 Agnostoids from McKay Group, west of Harrogate, British Columbia (“Parabolinella [ = Olenaspella] evansi (Kobayashi)] limestone”, locality P6/5). 1–10 , 14–17 , Acmarhachis acuta ( Kobayashi, 1938 ): 1, 2, cephalon, GSC 135359, dorsal and anterior views (previously unfigured
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Figure  12 —Upper slope trilobite biofacies, LATE CAMBRIAN, Ayusokkanian an...
Published: 01 November 2000
, SNIIGGiMS 459/3, ×4; 3, Lisogoragnostus sp., dorsal shield, SNIIGGiMS 459/4, ×15; 4, Acmarhachis acutus (Kobayashi), pygidium, SNIIGGiMS 459/5, ×9; 5, Clavagnostus sulcatus Westergard, cephalon, SNIIGGiMS 459/6, ×9; 6, 9, Genus and species undetermined 2; 6, cephalon, SNIIGGiMS 459/7, ×15; 9
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Figure  13 —Lower slope trilobite biofacies, LATE CAMBRIAN, Ayusokkanian an...
Published: 01 November 2000
( Pseudeugonocare ) borealis (Lermontova), cranidium, SNIIGGiMS 373/12, ×5; 13, Acmarhachis acutus (Kobayashi), pygidium, SNIIGGiMS 373/13, ×10; 14, 15, Erixanium sentum Öpik, ×5; 14, pygidium SNIIGGiMS 373/15; 15, cranidium, SNIIGGiMS 373/14; 16, Oedorhachis ? typicalis Resser, pygidium, SNIIGGiMS
Journal Article
Published: 01 May 2002
Journal of Paleontology (2002) 76 (3): 565–569.
... and Robison, 2000 ; placed “ Pseudagnostus communis ” in synonymy with P. josepha — Peng and Robison, 2000 ; placed Acmarhachis acuta in synonymy with A. typicalis — Peng and Robison, 2000 ; placed Peratagnostus nobilis in synonymy with P. obsoletus — Peng and Robison, 2000 ; assigned Parabolina...
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Journal Article
Published: 01 November 2000
Journal of Paleontology (2000) 74 (6): 1000–1019.
..., SNIIGGiMS 459/3, ×4; 3, Lisogoragnostus sp., dorsal shield, SNIIGGiMS 459/4, ×15; 4, Acmarhachis acutus (Kobayashi), pygidium, SNIIGGiMS 459/5, ×9; 5, Clavagnostus sulcatus Westergard, cephalon, SNIIGGiMS 459/6, ×9; 6, 9, Genus and species undetermined 2; 6, cephalon, SNIIGGiMS 459/7, ×15; 9...
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Journal Article
Published: 15 April 2014
Geological Magazine (2015) 152 (1): 28–40.
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Journal Article
Published: 01 September 2003
Journal of Paleontology (2003) 77 (5): 895–907.
... ): i.e., the Lejopyge laevigata , Proagnostus bulbus , and Linguagnostus reconditus zones of South China ( Peng and Robison, 2000 ), Lejopyge laevigata , Erediaspis eretes , and Acmarhachis quasivesta zones of Australia ( Öpik, 1967 ), and Lejopyge laevigata and Cedaria zones of Laurentia...
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Series: GSA Field Guide
Published: 01 January 2015
DOI: 10.1130/2015.0040(04)
EISBN: 9780813756400
... in a sediment-starved, basinal environment ( Brezinski et al., 2012 ). Specimens of the trilobite Olenellus and the enigmatic fossil Salterella , both Lower Cambrian guide fossils, have been recovered from the basal part of the Monocacy Member ( Brezinski, 2004 ). The Upper Cambrian agnostoid Acmarhachis...
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Series: Geological Society, London, Memoirs, Geological Society, London, Memoirs
Published: 01 January 2013
DOI: 10.1144/M38.19
EISBN: 9781862396425
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