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Plaesiomys

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Journal Article

Phylogenetic Revision of the Late Ordovician Orthid Brachiopod Genera Plaesiomys and Hebertella from Laurentia Available to Purchase

David F. Wright, Alycia L. Stigall
Published: 01 November 2013
Journal of Paleontology (2013) 87 (6): 1107–1128.
DOI: https://doi.org/10.1666/12-083
...David F. Wright; Alycia L. Stigall A bstract The orthidine brachiopod genera Plaesiomys and Hebertella are significant constituents of Late Ordovician benthic marine communities throughout Laurentia. Species-level phylogenetic analyses were conducted on both genera to inform systematic revisions...
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View PDF for article title, Phylogenetic Revision of the Late Ordovician Orthid Brachiopod Genera <span class="search-highlight">Plaesiomys</span> and Hebertella from Laurentia
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Journal Article

Evolution of the Late Ordovician plaesiomyid brachiopod lineage in Laurentia Available to Purchase

Colin D. Sproat, Jisuo Jin
Published: 04 July 2013
Canadian Journal of Earth Sciences (2013) 50 (8): 872–894.
DOI: https://doi.org/10.1139/cjes-2013-0022
... would have allowed for larger diductor muscles to open a larger, heavier shell. In this study, two new species, Plaesiomys periosa sp. nov. and Plaesiomys lenzi sp. nov., are proposed, and two existing species are transferred from Dinorthis to Plaesiomys. Corresponding author: Colin D. Sproat...
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View PDF for article title, Evolution of the Late Ordovician plaesiomyid brachiopod lineage in Laurentia
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Journal Article

Late Ordovician brachiopods from east-central Alaska, northwestern margin of Laurentia Available to Purchase

Jisuo Jin, Robert B. Blodgett
Published: 01 July 2020
Journal of Paleontology (2020) 94 (4): 637–652.
DOI: https://doi.org/10.1017/jpa.2020.10
... (Twenhofel, 1928 ), Plaesiomys occidentalis (Okulitch, 1943 ), Eoplectodonta sp., Holtehdalina sp., Leptaena sp., Brevilamnulella minuta n. sp., Tcherskidium tenuicostatum n. sp., Rhynchotrema iowense Wang, 1949 , and Whitfieldella sp. The presence of Plaesiomys occidentalis and Tcherskidium tenuicostata n...
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View PDF for article title, Late Ordovician brachiopods from east-central Alaska, northwestern margin of Laurentia
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Fig. 7.

(A–E) Plaesiomys occidentalis ( Okulitch, 1943 ) hypotype: dorsal, ventra... Available to Purchase

Published: 04 July 2013
Fig. 7. (A–E) Plaesiomys occidentalis ( Okulitch, 1943 ) hypotype: dorsal, ventral, anterior, posterior, and lateral views, respectively; GSC 117745, Gunn Member, Stony Mountain Formation, Manitoba. (F–J) Plaesiomys browni ( Billings, 1865 ) (note scale change): dorsal, ventral, anterior
Journal Article

Orthacea from the Montoya Group (Ordovician) of trans-Pecos Texas Free

Herbert J. Howe
Published: 01 March 1966
Journal of Paleontology (1966) 40 (2): 241–257.
...Herbert J. Howe Abstract Orthacea in the Upham, Aleman, and Cutter formations include Glyptorthis insulpta maquoketensis Ladd, Hesperorthis kirki n. sp., Plaesiomys bellistriatus Wang, P. cf. P. subquadratus (Hall), P. subquadratus cutterensis n. subsp., Hebertella occidentalis montoyensis n. subsp...
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Fig. 6.

(A–E) Plaesiomys subcircularis ( Roy, 1941 ) holotype: dorsal, ventral, a... Available to Purchase

Published: 04 July 2013
Fig. 6. (A–E) Plaesiomys subcircularis ( Roy, 1941 ) holotype: dorsal, ventral, anterior, posterior, and lateral views, respectively; GSC 113498, Amadjuack Formation, Silliman’s Fossil Mount, Baffin Island. (F–J) Specimen from Western University: dorsal, ventral, anterior, posterior
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Data ranges for continuous characters of species analyzed in phylogenetic a... Available to Purchase

Published: 01 November 2013
Table 5 Data ranges for continuous characters of species analyzed in phylogenetic analysis of Plaesiomys .
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Statistical separation of continuous characters in Plaesiomys analysis (S... Available to Purchase

Published: 01 November 2013
Table 7 Statistical separation of continuous characters in Plaesiomys analysis (SD=standard deviation).
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Character state distribution for species included in phylogenetic analysis ... Available to Purchase

Published: 01 November 2013
Table 9 Character state distribution for species included in phylogenetic analysis of Plaesiomys (X=0 and 1).
Journal Article

EPIPUNCTAE AND PHOSPHATIZED SETAE IN LATE ORDOVICIAN PLAESIOMYID BRACHIOPODS FROM ANTICOSTI ISLAND, EASTERN CANADA Available to Purchase

JISUO JIN, RENBIN ZHAN, PAUL COPPER, W. G. E. CALDWELL
Published: 01 July 2007
Journal of Paleontology (2007) 81 (4): 666–683.
DOI: https://doi.org/10.1666/pleo0022-3360(2007)081[0666:EAPSIL]2.0.CO;2
... of ‘ Orthis sola ’ Billings, 1866 , the type species of Pionorthis , is allied to Plaesiomys Hall and Clarke, 1892 . It bears the characteristic epipunctae. The holotype of Orthis sola is a dalmanelloid shell with true punctae, assignable to Mendacella Cooper, 1930 . This warrants rejection of the genus...
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View PDF for article title, EPIPUNCTAE AND PHOSPHATIZED SETAE IN LATE ORDOVICIAN PLAESIOMYID BRACHIOPODS FROM ANTICOSTI ISLAND, EASTERN CANADA
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Stratigraphic and geographic distribution of Plaesiomys . Symbol † indicat... Available to Purchase

Published: 01 November 2013
Table 11 Stratigraphic and geographic distribution of Plaesiomys . Symbol † indicates Gamachian (Hirnantian), all other species are Richmondian (Katian).
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Plaesiomys occidentalis (Okulitch, 1943). Asterisk (*) denotes measurement... Available to Purchase

Published: 01 July 2020
Plaesiomys occidentalis (Okulitch, 1943). Asterisk (*) denotes measurement of actually preserved portion.   Length Width Thickness/depth GSC131805 3.5 4.9 2.1 GSC131806 4.6 6.5* 2.4 GSC131804 12.3 20.3 1.5
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Phylogenetic relationships for species of Plaesiomys Hall and Clarke, 1892 and Hebertella Hall and Clarke, 1892 mapped onto geologic time. Time scale modified from Holland and Patzkowsky, 1996.

Phylogenetic relationships for species of Plaesiomys Hall and Clarke, 189... Available to Purchase

Published: 01 November 2013
Figure 3 Phylogenetic relationships for species of Plaesiomys Hall and Clarke, 1892 and Hebertella Hall and Clarke, 1892 mapped onto geologic time. Time scale modified from Holland and Patzkowsky, 1996 .
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Fig. 13.

Tracings of serial sections of specimens W-MI5 ( Plaesiomys browni ) from t... Available to Purchase

Published: 04 July 2013
Fig. 13. Tracings of serial sections of specimens W-MI5 ( Plaesiomys browni ) from the Verulam Formation on Manitoulin Island. Measurements refer to distance from the most posterior point on the dorsal umbo.
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Fig. 10.

Aditicules (the larger of the shell perforations) and epipunctae (smaller p... Available to Purchase

Published: 04 July 2013
Fig. 10. Aditicules (the larger of the shell perforations) and epipunctae (smaller perforations) in Plaesiomys subquadrata . Note how the aditicules form a distinct row perpendicular to the anterior commissure while the epipunctae are distributed more uniformly.
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Plaesiomys occidentalis (Okulitch, 1943 ). Asterisk (*) denotes measureme... Available to Purchase

Published: 01 July 2020
Plaesiomys occidentalis (Okulitch, 1943 ). Asterisk (*) denotes measurement of actually preserved portion.   Length Width Thickness/depth GSC131807 — 28.5 8.9 GSC131808 24.5 26.7 — GSC131809 23.2 26.3* — GSC131810 17.2 20.8* — GSC131811 28.6 28.6* 9.3
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Silicified Plaesiomys occidentalis (Okulitch, 1943) from unnamed upper Katian strata, locality 92ABd8, Black River D-1 1:63,360 scale quadrangle, east-central Alaska. (1) GSC 131809, interior of ventral valve, with large muscle field and slender, elongate oval adductor scars enclosed by diductor scars laterally and anteriorly; (2, 3, 10) GSC 131810: (2) exterior and (3) interior of medium-sized dorsal valve and (10) local enlargement of cardinalia; (4–9) GSC 131811: (4) interior, (5) exterior, and (6) lateral views of dorsal valve; (7–9) local enlargement of (7, 8) trilobed cardinal process and (9) dense, single-column aditicules per rib.

Silicified Plaesiomys occidentalis (Okulitch, 1943 ) from unnamed upper ... Available to Purchase

Published: 01 July 2020
Figure 4. Silicified Plaesiomys occidentalis (Okulitch, 1943 ) from unnamed upper Katian strata, locality 92ABd8, Black River D-1 1:63,360 scale quadrangle, east-central Alaska. ( 1 ) GSC 131809, interior of ventral valve, with large muscle field and slender, elongate oval adductor scars
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1, Plaesiomys subquadratus (Hall, 1847), AMNH 30263, lectotype, ventral view, ×1.9; 2, dorsal view, ×1.9; 3, YPM S-728d, ventral interior, ×1.7; 4, YPM S-238f, dorsal interior, ×1.7; 5, P. proavitus (Winchell and Schuchert, 1892), YPM S-703a, lectotype, dorsal view, ×2.3; 6, SUI 1808, ventral view, ×2.9; 7, P. idahoensis Ross, 1949, USNM 133239, cast of holotype, dorsal view, ×2.6; 8, ventral view, ×2.6; 9, P. cutterensisHowe, 1966, USNM 268935, cast of holotype, ventral view, ×2.0.

1, Plaesiomys subquadratus ( Hall, 1847 ), AMNH 30263, lectotype, ventral... Available to Purchase

Published: 01 November 2013
Figure 6 1, Plaesiomys subquadratus ( Hall, 1847 ), AMNH 30263, lectotype, ventral view, ×1.9; 2 , dorsal view, ×1.9; 3 , YPM S-728d, ventral interior, ×1.7; 4 , YPM S-238f, dorsal interior, ×1.7; 5 , P. proavitus ( Winchell and Schuchert, 1892 ), YPM S-703a, lectotype, dorsal view
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Fig. 12.

Plaesiomys browni ( Billings, 1865 ). Holotype: (A) ventral valve embedded... Available to Purchase

Published: 04 July 2013
Fig. 12. Plaesiomys browni ( Billings, 1865 ). Holotype: (A) ventral valve embedded in rock; GSC 1620, Trentonian Formation (equivalent to the Simcoe Group), Belleville, Ontario. Paratype: (B) dorsal valve embedded in rock; GSC 6391, Hull or Sherman Fall beds (approximately equivalent
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Fig. 14.

Plaesiomys occidentalis ( Okulitch, 1943 ). (A–G) Hypotype: dorsal, ventra... Available to Purchase

Published: 04 July 2013
Fig. 14. Plaesiomys occidentalis ( Okulitch, 1943 ). (A–G) Hypotype: dorsal, ventral, lateral, posterior, and anterior views, respectively, with an enlargement of the posterior showing trilobed cardinal process and open delthyrium, and an enlargement of the anterior showing aditicules