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Achatella

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Journal Article

Systematics and paleobiogeographic significance of the Upper Ordovician pterygometopine trilobite Achatella Delo, 1935 Available to Purchase

Robert E. Swisher, Stephen R. Westrop, Lisa Amati
Published: 01 January 2016
Journal of Paleontology (2016) 90 (1): 59–77.
DOI: https://doi.org/10.1017/jpa.2015.71
...Robert E. Swisher; Stephen R. Westrop; Lisa Amati Abstract Study of type and new material of the pterygometopine Achatella Delo, 1935 demonstrates the presence of four species in Upper Ordovician (Katian) strata of Laurentian North America, A . achates (Billings, 1860) from the northeastern United...
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View PDF for article title, Systematics and paleobiogeographic significance of the Upper Ordovician pterygometopine trilobite <span class="search-highlight">Achatella</span> Delo, 1935
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Journal Article

Trilobites of the Pabos Formation (Ashgillian, Upper Ordovician), Perce area, Quebec Free

Pierre J. Lesperance, John A. Weissenberger
Published: 01 March 1998
Journal of Paleontology (1998) 72 (2): 303–316.
..., commented upon, and illustrated. Ten species are specifically determined and three of these are new: Remopleurides arenosus, Achatella (Achatella) clivosa, and Meadowtownella sacerdos. Hibbertia whittingtoni (McNamara, 1979) is a junior secondary homonym and renamed H. conistonensis. The Ashgillian...
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Results of a phylogenetic analysis of a character matrix (Table 1; see appendix for list of characters) for Achatella species. (1) Strict consensus of 42 trees discovered with a branch-and-bound search (implicit enumeration). Support metrics (calculated in TNT; Goloboff et al., 2008) show by numbers are Bremer support (boldface; only values &gt;1 are shown), GC bootstrap support (italics) and conventional bootstrap support (roman font). Shaded region comprises species of Achatella as diagnosed in this study. B, species from Baltica; L, species from Laurentian North America and Britain; (2) optimized character distribution plotted on one of the most parsimonious trees. Numbers above circles refer to characters and those below identify particular states (Appendix). Only unambiguous transformations (i.e., optimize to the same nodes under the assumptions of both ACCTRAN and DELTRAN) are shown; filled circles show states that originate at a single node, and open circles indicate states that are homoplastic.

Results of a phylogenetic analysis of a character matrix ( Table 1 ; see ap... Available to Purchase

Published: 01 January 2016
Figure 2 Results of a phylogenetic analysis of a character matrix ( Table 1 ; see appendix for list of characters) for Achatella species. ( 1 ) Strict consensus of 42 trees discovered with a branch-and-bound search (implicit enumeration). Support metrics (calculated in TNT; Goloboff et al
Journal Article

Ordovician Pterygometopidae (Trilobita) of North America Free

Rolf Ludvigsen, Brian D. E. Chatterton
Published: 01 November 1982
Canadian Journal of Earth Sciences (1982) 19 (11): 2179–2206.
DOI: https://doi.org/10.1139/e82-192
..., the Eomonorachinae characterizes Laurentia, and the Monorakinae characterizes Siberia. In North America, pterygometopids occur in strata of Whiterockian to Gamachian (Llanvirn to Ashgill) age. The Pterygometopinae is represented by Achatella Delo, the Monorakinae by Monorakos Schmidt, the Chasmopinae by Toxochasmops...
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Achatella achates (Billings, 1860) from Ontario. (1–4) Enrolled exoskeleton (ROM 49475), dorsal, ventral, lateral and anterior views, ×7, Verulam Formation, Gamebridge Quarry, Gamebridge; (5) complete, somewhat compacted exoskeleton (GSC 1784, holotype), ×3.75, Lindsay Formation, Ottawa.

Achatella achates (Billings, 1860 ) from Ontario. ( 1–4 ) Enrolled exoske... Available to Purchase

Published: 01 January 2016
Figure 3 Achatella achates (Billings, 1860 ) from Ontario. ( 1–4 ) Enrolled exoskeleton (ROM 49475), dorsal, ventral, lateral and anterior views, ×7, Verulam Formation, Gamebridge Quarry, Gamebridge; ( 5 ) complete, somewhat compacted exoskeleton (GSC 1784, holotype), ×3.75, Lindsay Formation
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Stratigraphic distribution of Achatella species from Laurentian North America. Third order depositional sequences from Holland and Patzkowsky, 1996. Sources of regional stratigraphic data: Missouri, Swisher, 2015; Oklahoma, Amati, 2014, Carlucci et al., 2014, Westrop et al., 2012; Cincinnati, Brett et al., 2004, Datillo et al., 2008; Ontario, Mitchell et al., 2004, Sharma et al., 2003, Amati and Westrop, unpublished.

Stratigraphic distribution of Achatella species from Laurentian North Ame... Available to Purchase

Published: 01 January 2016
Figure 1 Stratigraphic distribution of Achatella species from Laurentian North America. Third order depositional sequences from Holland and Patzkowsky, 1996 . Sources of regional stratigraphic data: Missouri, Swisher, 2015 ; Oklahoma, Amati, 2014 , Carlucci et al., 2014 , Westrop et al
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Achatella achates (Billings, 1860) from Canada. (1–3) Cephalon (ROM 63163), anterior, dorsal and lateral views, ×5.5, Trenton Group, Hull, Quebec; (4) Incomplete exoskeleton (ROM 63161), dorsal view, ×4.5, Trenton Group, Hull, Quebec; (5) cephalon (ROM 18747), dorsal view, ×4.5, Trenton Group, Hull, Quebec (illustrated previously by Ludvigsen and Chatterton, 1982, pl. 1, figs. 2); (6, 7) cephalon (ROM 63160), dorsal and posterior views, ×10, Verulam Formation, Lakefield Quarry, Lakefield, Ontario.

Achatella achates (Billings, 1860 ) from Canada. ( 1–3 ) Cephalon (ROM 63... Available to Purchase

Published: 01 January 2016
Figure 4 Achatella achates (Billings, 1860 ) from Canada. ( 1–3 ) Cephalon (ROM 63163), anterior, dorsal and lateral views, ×5.5, Trenton Group, Hull, Quebec; ( 4 ) Incomplete exoskeleton (ROM 63161), dorsal view, ×4.5, Trenton Group, Hull, Quebec; ( 5 ) cephalon (ROM 18747), dorsal view, ×4.5
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Achatella achates (Billings, 1860), Canada. (1–3) Cephalon (ROM 35371), anterior, lateral and dorsal views, ×6.5, Lakefield Quarry, Lakefield, Ontario; (4) nearly complete exoskeleton (ROM 63162), dorsal view, ×4, Trenton Group, Hull, Quebec; (5–7) pygidium (ROM 63159), dorsal, lateral and posterior views, ×10, Verulam Formation, Gamebridge Quarry, upper face.

Achatella achates (Billings, 1860 ), Canada. ( 1–3 ) Cephalon (ROM 35371)... Available to Purchase

Published: 01 January 2016
Figure 5 Achatella achates (Billings, 1860 ), Canada. ( 1–3 ) Cephalon (ROM 35371), anterior, lateral and dorsal views, ×6.5, Lakefield Quarry, Lakefield, Ontario; ( 4 ) nearly complete exoskeleton (ROM 63162), dorsal view, ×4, Trenton Group, Hull, Quebec; ( 5–7 ) pygidium (ROM 63159), dorsal
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Achatella carleyi (Meek, 1872), Cincinnati region, Ohio. (1–3) Cephalon (CM 51280a), dorsal, anterior and lateral views, ×8, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; (4, 5) cephalon (CM 31699a), dorsal and anterior views, ×12, “Lorraine Group” Formation, Cincinnati, Hamilton County, Ohio; (6–8) cephalon (CM 51280b), dorsal, lateral and posterior views, ×8, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; (9, 10) cephalon (UC 965; lectotype), lateral and dorsal views, ×8, Fairview Formation, Cincinnati.

Achatella carleyi (Meek, 1872 ), Cincinnati region, Ohio. ( 1–3 ) Cephalo... Available to Purchase

Published: 01 January 2016
Figure 6 Achatella carleyi (Meek, 1872 ), Cincinnati region, Ohio. ( 1–3 ) Cephalon (CM 51280a), dorsal, anterior and lateral views, ×8, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; ( 4, 5 ) cephalon (CM 31699a), dorsal
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Achatella carleyi (Meek, 1872), Cincinnati region, Ohio. (1, 2) Cephalon (CM 51280c), dorsal and anterior views, x9, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; (3) pygidium (CM 31699c), dorsal view, ×10, Lorraine Group”, Cincinnati, Ohio; (4, 5) pygidium (CM 51280d), posterior and dorsal views, ×7, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; (6) cephalon (CM 31699b), dorsal view, ×6, “Lorraine Group,” Cincinnati, Ohio.

Achatella carleyi (Meek, 1872 ), Cincinnati region, Ohio. ( 1, 2 ) Cephal... Available to Purchase

Published: 01 January 2016
Figure 7 Achatella carleyi (Meek, 1872 ), Cincinnati region, Ohio. ( 1, 2 ) Cephalon (CM 51280c), dorsal and anterior views, x9, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; ( 3 ) pygidium (CM 31699c), dorsal view, ×10
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Achatella katharina (Bradley, 1930), Kimmswick Formation, Batchtown, Illinois. (1–3) Cephalon (UC 33780a; paratype), dorsal, anterior and lateral views, ×4.5; (4) cephalon (UC 337380a; paratype), dorsal view, ×4.5; (5–7) cephalon (UC 20685; holotype), anterior, lateral and dorsal views, ×6.5; (8–11) cephalon (UC 33780e; paratype), anterior, lateral-exterior, lateral-interior and dorsal views, ×6.5.

Achatella katharina (Bradley, 1930 ), Kimmswick Formation, Batchtown, Ill... Available to Purchase

Published: 01 January 2016
Figure 8 Achatella katharina (Bradley, 1930 ), Kimmswick Formation, Batchtown, Illinois. ( 1–3 ) Cephalon (UC 33780a; paratype), dorsal, anterior and lateral views, ×4.5; ( 4 ) cephalon (UC 337380a; paratype), dorsal view, ×4.5; ( 5–7 ) cephalon (UC 20685; holotype), anterior, lateral
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Achatella katharina (Bradley, 1930), Kimmswick Formation, Missouri. All from a road cut along State Highway 79, Lincoln Co., Missouri, approximately 5.25 km south of the village of Elsbury, except (1–3) (road cut on County Road M, Jefferson Co., Missouri, 200 m southeast of the intersection with Old Lemay Ferry Road). (1–3) Cephalon (OU 222760), anterior, dorsal and lateral views, ×6.5, collection M19; (4–6) cephalon (OU 222761), anterior, dorsal and lateral views, ×6.5, collection 79 M-1 m; (7) cranidium, (OU 222762), dorsal view, ×6.5, collection 79 M-1 m; (8–10) cephalon (OU 222763), dorsal, anterior and lateral views, ×10, collection 79 M-1 m; (11) free cheek (OU 222764), lateral view, ×12, collection 79 M-1 m.

Achatella katharina (Bradley, 1930 ), Kimmswick Formation, Missouri. All ... Available to Purchase

Published: 01 January 2016
Figure 9 Achatella katharina (Bradley, 1930 ), Kimmswick Formation, Missouri. All from a road cut along State Highway 79, Lincoln Co., Missouri, approximately 5.25 km south of the village of Elsbury, except ( 1–3 ) (road cut on County Road M, Jefferson Co., Missouri, 200 m southeast
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Achatella katharina (Bradley, 1930), all from Viola Springs Formation, roadcut along west side of U.S, Highway 99, 5 km south of Fittstown, Pontotoc County, Oklahoma (except 9, 10, Lawrence Quarry, approximately 10 km southwest of Ada, Pontotoc County). (1–3) Cephalon (OU 12121), anterior, dorsal and lateral views, ×5.25, collection 99-51; (4–6) cephalon (OU 12123), anterior, lateral and dorsal views, ×6, collection 99-float; (7, 8) cephalon (OU 222765), lateral and dorsal views, ×5.5, collection HW99-51; (9, 10) cranidium (OU 12124), latex cast from external mold, dorsal and anterior views, ×5.25.

Achatella katharina (Bradley, 1930 ), all from Viola Springs Formation, r... Available to Purchase

Published: 01 January 2016
Figure 10 Achatella katharina (Bradley, 1930 ), all from Viola Springs Formation, roadcut along west side of U.S, Highway 99, 5 km south of Fittstown, Pontotoc County, Oklahoma (except 9, 10 , Lawrence Quarry, approximately 10 km southwest of Ada, Pontotoc County). ( 1–3 ) Cephalon (OU 12121
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Achatella katharina (Bradley, 1930), Kimmswick Formation. (1–3) Pygidium (UC 28977; paratype of A. katharina but assigned doubtfully to that species in this paper), dorsal, posterior and lateral views, ×7, Glen Park, Missouri; (4–6) pygidium (UC 33780b, paratype), dorsal, lateral and posterior views, Batchtown, Illinois, ×7; (7–9) pygidium (OU 222766), posterior, lateral, and dorsal views, ×7, collection 79 M-1 m.

Achatella katharina (Bradley, 1930 ), Kimmswick Formation. ( 1–3 ) Pygidi... Available to Purchase

Published: 01 January 2016
Figure 11 Achatella katharina (Bradley, 1930 ), Kimmswick Formation. ( 1–3 ) Pygidium (UC 28977; paratype of A . katharina but assigned doubtfully to that species in this paper), dorsal, posterior and lateral views, ×7, Glen Park, Missouri; ( 4–6 ) pygidium (UC 33780b, paratype), dorsal
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Achatella katharina (Bradley, 1930). All from the Kimmswick Formation, road cut along State Highway 79, Lincoln Co., Missouri, approximately 5.25 km south of the village of Elsbury except (8–10) (Viola Springs Formation, roadcut along west side of U.S, Highway 99, 5 km south of Fittstown, Pontotoc County, Oklahoma, collection 99-49). (1–3) Pygidium (OU 222767) dorsal, lateral, and posterior views, ×15, collection 79 M-1 m; (4) pygidium (OU 222768), dorsal view, ×15, collection 79 M-1 m; (5–7) hypostome (UC 28975a, paratype), posterior, ventral, and lateral views, ×16; (8–10) pygidium (OU 12125), posterior, lateral, and dorsal views, ×10.

Achatella katharina (Bradley, 1930 ). All from the Kimmswick Formation, r... Available to Purchase

Published: 01 January 2016
Figure 12 Achatella katharina (Bradley, 1930 ). All from the Kimmswick Formation, road cut along State Highway 79, Lincoln Co., Missouri, approximately 5.25 km south of the village of Elsbury except ( 8–10 ) (Viola Springs Formation, roadcut along west side of U.S, Highway 99, 5 km south
Journal Article

JPA volume 90 issue 1 Cover and Back matter Available to Purchase

Published: 01 January 2016
Journal of Paleontology (2016) 90 (1): b1–b2.
DOI: https://doi.org/10.1017/jpa.2016.88
...) douvilleiceratid ammonites from Haida Gwaii, British Columbia, Canada 59 Robert E. Swisher, Stephen R. Westrop, and Lisa Amati Systematics and paleobiogeographic signifi cance of the Upper Ordovician pterygometopine trilobite Achatella Delo, 1935 78 Erika M. Danielsen and D. Jeffrey Over Lower Silurian conodonts...
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Journal Article

The Ordovician biogeography of the Grangegeeth terrane and the Iapetus suture zone in eastern Ireland Available to Purchase

A. W. OWEN, D. A. T. HARPER, M. ROMANO
Published: 01 February 1992
Journal of the Geological Society (1992) 149 (1): 3–6.
DOI: https://doi.org/10.1144/gsjgs.149.1.0003
...-Welsh) faunas in strata broadly equivalent to or only slightly younger than those at Grangegeeth. Con- versely, Achatella extended its range to undoubted Laurentian sites by the mid Caradoc. The biogeographical evidence from these four taxa, therefore, is not conclusive. The two remaining...
View PDF for article title, The Ordovician biogeography of the Grangegeeth terrane and the Iapetus suture zone in eastern Ireland
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Journal Article

JPA volume 90 issue 1 Cover and Front matter Available to Purchase

Published: 01 January 2016
Journal of Paleontology (2016) 90 (1): f1–f4.
DOI: https://doi.org/10.1017/jpa.2016.87
... and paleobiogeographic signifi cance of the Upper Ordovician pterygometopine trilobite Achatella Delo, 1935 78 Erika M. Danielsen and D. Jeffrey Over Lower Silurian conodonts from the Shine Jinst region, southwestern Mongolia 92 Agustín G. Martinelli, Marina Bento Soares, and Rainer R. Schoch Owenettids...
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Character matrix used in the phylogenetic analysis ( Fig. 2 ) ... Available to Purchase

Published: 01 January 2016
1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 Achatella achates 1 1 2 1 1 1 1 1 1 1 1 1 1 0 2 1 0 3 1 A . katharina 1 1 2 1 1 1 1 1 1 1 1 1 1 0 2 1 1 3 1 A . clivosa 1 1 ? 1 1 1 1 1 1 1 0 0 0 0 0 1 0 2 1
Journal Article

SEDIMENTARY FACIES AND TRILOBITE BIOFACIES ALONG AN ORDOVICIAN SHELF TO BASIN GRADIENT, VIOLA GROUP, SOUTH-CENTRAL OKLAHOMA Available to Purchase

LISA AMATI, STEPHEN R. WESTROP
Journal: PALAIOS
Published: 01 December 2006
PALAIOS (2006) 21 (6): 516–529.
DOI: https://doi.org/10.2110/palo.2006.p06-069
.... In addition to the eponymous genus, calymenid ( Flexicalymene ), pterygometopid ( Achatella and Calyptaulax ), isoteline ( Isotelus ), harpetid ( Dolichoharpes ), and aulacopleurid ( Harpidella ) trilobites are important components of the biofacies. Trilobite diversity was even higher...
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