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Triarthrus becki

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Journal Article

Morphometric analysis of ontogeny and allometry of the Middle Ordovician trilobite Triarthrus becki Available to Purchase

Keonho Kim, H. David Sheets, Robert A. Haney, Charles E. Mitchell
Journal: Paleobiology
Published: 01 January 2002
Paleobiology (2002) 28 (3): 364–377.
DOI: https://doi.org/10.1666/0094-8373(2002)028<0364:MAOOAA>2.0.CO;2
... in holaspides is very small relative to that in meraspides. The boundary between meraspis and holaspis in Triarthrus becki appears to correspond to a large change in the rate of ontogenetic change, but neither to a change in the direction of that trajectory nor to a cessation of ontogenetic change...
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View PDF for article title, Morphometric analysis of ontogeny and allometry of the Middle Ordovician trilobite <span class="search-highlight">Triarthrus</span> <span class="search-highlight">becki</span>
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Figure 4. Small (A) to large (L) specimens of Triarthrus becki. A, Meraspis, NYSM 16781, Cephalic length (CL) = 0.97 mm. B, Meraspis, NYSM 16782, CL = 1.13 mm. C, Meraspis, NYSM 16783, CL = 1.31 mm. D, Meraspis, NYSM 16784, CL = 1.41 mm. E, Meraspis, NYSM 16785, CL = 1.49 mm. F, Meraspis, NYSM 17058, CL = 1.72 mm. G, Meraspis, NYSM 17059, CL = 1.91 mm. H, Meraspis, NYSM 17060, CL = 2.13 mm. I, Holaspis, NYSM 17061, CL = 3.10 mm. J, Holaspis, NYSM 17062, CL = 4.25 mm. K, Holaspis, NYSM 17063, CL = 5.39 mm. L, Holaspis, NYSM 17064, CL = 6.42 mm. These 12 specimens are reposited in the New York State Museum as hypotypes

Figure 4. Small (A) to large (L) specimens of Triarthrus becki . A, Meras... Available to Purchase

Published: 01 January 2002
Figure 4. Small (A) to large (L) specimens of Triarthrus becki . A, Meraspis, NYSM 16781, Cephalic length (CL) = 0.97 mm. B, Meraspis, NYSM 16782, CL = 1.13 mm. C, Meraspis, NYSM 16783, CL = 1.31 mm. D, Meraspis, NYSM 16784, CL = 1.41 mm. E, Meraspis, NYSM 16785, CL = 1.49 mm. F, Meraspis, NYSM
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Figure 5. Twelve landmark points on the cranidium exoskeleton of Triarthrus becki

Figure 5. Twelve landmark points on the cranidium exoskeleton of Triarthr... Available to Purchase

Published: 01 January 2002
Figure 5. Twelve landmark points on the cranidium exoskeleton of Triarthrus becki
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Table 1.  Locations of the 12 landmarks in left side on the cephalon of Tr... Available to Purchase

Published: 01 January 2002
Table 1.  Locations of the 12 landmarks in left side on the cephalon of Triarthrus becki in Figure 5 . Landmarks 1 to 4 lie on the plane of bilateral symmetry
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Figure 3. Plot of bivariate relationships between cephalic length (length between landmark 1 and 4) and glabellar width at 1s glabellar furrow (width between landmark 8 and sagittal axis) of Triarthrus becki

Figure 3. Plot of bivariate relationships between cephalic length (length ... Available to Purchase

Published: 01 January 2002
Figure 3. Plot of bivariate relationships between cephalic length (length between landmark 1 and 4) and glabellar width at 1s glabellar furrow (width between landmark 8 and sagittal axis) of Triarthrus becki
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Figure 2. Upper surface of rock slab containing numerous cranidia of Triarthrus becki from sample studied herein. Scale units are 1 cm. Note predominantly convex-up orientation and wide range of cranidium size

Figure 2. Upper surface of rock slab containing numerous cranidia of Tria... Available to Purchase

Published: 01 January 2002
Figure 2. Upper surface of rock slab containing numerous cranidia of Triarthrus becki from sample studied herein. Scale units are 1 cm. Note predominantly convex-up orientation and wide range of cranidium size
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Figure 8. Plots of deformation vectors from the predicted smallest to the predicted largest specimen according to regression model within the meraspid (upper three figures) and the holaspid (lower three figures) stages; vectors calculated from three different superimposition settings (GLS, SBR, and BTR from left to right in each ontogenetic stage). Twelve landmarks on the left side of Triarthrus becki were used for these graphical presentations

Figure 8. Plots of deformation vectors from the predicted smallest to the ... Available to Purchase

Published: 01 January 2002
, and BTR from left to right in each ontogenetic stage). Twelve landmarks on the left side of Triarthrus becki were used for these graphical presentations
Journal Article

Ontogeny and shape change of the phacopid trilobite Calyptaulax Available to Purchase

Gabriel S. Jacobs, Jesse R. Carlucci
Published: 01 November 2019
Journal of Paleontology (2019) 93 (6): 1105–1125.
DOI: https://doi.org/10.1017/jpa.2019.38
... in the same molt in Calyptaulax , but sagittal lengths of pre- and post-holeidos specimens are consistent with contemporaneity of the two transitions. A similar conclusion was drawn by Kim et al. ( 2002 ) in a study of Triarthrus becki (Walcott, 1879 ), identifying the meraspid-holaspid transition...
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Journal Article

TRIARTHRINID TRILOBITES (OLENIDAE) FROM THE MIDDLE AND UPPER ORDOVICIAN, PRECORDILLERA OF ARGENTINA Available to Purchase

GREGORY D. EDGECOMBE, BRIAN D. E. CHATTERTON, NORBERTO E. VACCARI, BEATRIZ G. WAISFELD
Published: 01 January 2005
Journal of Paleontology (2005) 79 (1): 89–109.
DOI: https://doi.org/10.1666/0022-3360(2005)079<0089:TTOFTM>2.0.CO;2
... analysis of ontogeny and allometry of the Middle Ordovician trilobite Triarthrus becki . Paleobiology , 28 : 364 – 377 . Kobayashi , T. 1936 . On the Parabolinella Fauna from Province Jujuy, Argentina, with a note on the Olenidae . Japanese Journal of Geology and Geography , 13 : 85 – 102...
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WALCOTT IN ALBANY, NEW YORK: JAMES HALL’S “SPECIAL ASSISTANT” Available to Purchase

Ellis L. Yochelson
Published: 01 April 1987
Earth Sciences History (1987) 6 (1): 86–94.
DOI: https://doi.org/10.17704/eshi.6.1.w65wn4l2215472q4
... from the Upper Ordovician Utica Shale. He was particularly interested in the trilobite Triarthrus becki and went off to Utica and Trenton Falls partly to obtain more more specimens and partly to bring his Calciferous specimens to Albany -- after first removing his own locality labels. By the end...
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Journal Article

Variation on cranidial shape of Parabolinella argentinensis Kobayashi (Trilobita, Olenidae) from the Tremadocian of northwestern Argentina: taxonomic implications Available to Purchase

Daniela S. Monti, María del Huerto Benítez, Mariano A. Ramirez
Published: 01 July 2016
Journal of Paleontology (2016) 90 (4): 672–688.
DOI: https://doi.org/10.1017/jpa.2016.53
... of Triarthrus becki Green, 1832 and its relation with the size and examined geographic patterns of variation in cranidial shape, providing valuable phylogenetic information. In the present work, classic morphometry and geometric morphometry (landmark-based methods) were used to evaluate the variability...
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Journal Article

TRILOBITE SYSTEMATICS: THE LAST 75 YEARS Available to Purchase

RICHARD A. FORTEY
Published: 01 November 2001
Journal of Paleontology (2001) 75 (6): 1141–1151.
DOI: https://doi.org/10.1666/0022-3360(2001)075<1141:TSTLY>2.0.CO;2
... . On the mode of occurrence and development of Triarthrus becki . American Geologist , 13 : 38 – 43 . Beecher , C. E. 1897 . Outline of a natural classfication of the trilobites . American Journal of Science , 3 : 89 – 106 . Benton , M. J. (ed.) 1993 . The Fossil Record 2...
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Nonlandmark classification in paleobiology: computational geometry as a tool for species discrimination Available to Purchase

Joshua Mike, Colin D. Sumrall, Vasileios Maroulas, Fernando Schwartz
Journal: Paleobiology
Published: 18 May 2016
Paleobiology (2016) 42 (4): 696–706.
DOI: https://doi.org/10.1017/pab.2016.19
... landmark and outline-based approach to ontogenetic shape change in the Ordovician trilobite Triarthrus becki . Pp. 67 – 82 in A.M.T. Elewa, ed. Morphometrics: applications in biology and paleontology . Springer Verlag , Berlin...
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Systematics, Biometry of the species Opsidiscus from the Middle Cambrian succession of the Spiti Basin, India Available to Purchase

Shivani Pandey, Suraj Kumar Parcha
Published: 01 October 2013
Jour. Geol. Soc. India (2013) 82 (4): 330–338.
DOI: https://doi.org/10.1007/s12594-013-0160-1
... Ordovician trilobite Triarthrus becki . Paleobiology , v. 28 ( 3 ), pp. 364 – 377 . Kobayashi , T. (1939) On the agnostids (Part 1 ). Jour. Faculty of Sci ., Tokyo University, Section II , v. 5 , pp. 69 – 198 . Kobayashi , T. (1962) The Cambrian –Ordovician formations and faunas...
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The ontogeny of trilobite segmentation: a comparative approach Available to Purchase

Nigel C. Hughes, Alessandro Minelli, Giuseppe Fusco
Journal: Paleobiology
Published: 01 December 2006
Paleobiology (2006) 32 (4): 602–627.
DOI: https://doi.org/10.1666/06017.1
... Ústredního Ústavu Geologického , 66 . 257 – 273 . Kim , K. , H. D. , Sheets , R. A. , Haney , C. E. , and Mitchell , 2002 , Morphometric analysis of the ontogeny and allometry of the Middle Ordovician trilobite Triarthrus becki : Paleobiology , 28 . 364 – 377...
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Reply to Comment on: Álvaro J.J., Esteve, J. & Zamora, S. 2019. Morphological assessment of the earliest paradoxidid trilobites (Cambrian Series 3) from Morocco and Spain [Geological Magazine] by Geyer G, Nowicki J, Żylińska A & Landing E Available to Purchase

J Javier Álvaro, Jorge Esteve
Published: 13 April 2020
Geological Magazine (2020) 157 (12): 1971–1982.
DOI: https://doi.org/10.1017/S0016756820000217
... Spanien . Senckenbergiana lethaea 39 , 235 – 53 . Sheets HD , Kim K and Mitchell CE ( 2004 ) A combined landmark and outline-based approach to ontogenetic shape change in the Ordovician trilobite Triarthrus becki . In Morphometrics: Applications in Biology and Paleontology...
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Evolutionary Modifications of Ontogeny of Three Dechenella Species (Proetidae), from the Middle Devonian of the Ardenne Massif (France) Available to Purchase

Arnaud Bignon, Catherine Crônier
Published: 01 May 2012
Journal of Paleontology (2012) 86 (3): 558–566.
DOI: https://doi.org/10.1666/10-163.1
... . Kim K. Sheets H. D. Haney R. A. Mitchell C. E. 2002 . Morphometric analysis of ontogeny and allometry of the Middle Ordovician trilobite Triarthrus becki...
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ONTOGENY AND GEOGRAPHIC VARIATION OF A NEW SPECIES OF THE CORYNEXOCHINE TRILOBITE ZACANTHOPSIS (DYERAN, CAMBRIAN) Available to Purchase

MELANIE J. HOPKINS, MARK WEBSTER
Published: 01 July 2009
Journal of Paleontology (2009) 83 (4): 524–547.
DOI: https://doi.org/10.1666/08-102R.1
... analysis of ontogeny and allometry of the Middle Ordovician trilobite Triarthrus becki : Paleobiology , 28 . 364 – 377 . Kim , K. , Sheets , H.D. , and Mitchell , C.E. , 2009 , Geographic and stratigraphic change in the morphology of Triarthrus beckii (Green) (Trilobita): A test...
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Morphological evolution during the last hurrah of the trilobites: morphometric analysis of the Devonian asteropyginid trilobites Open Access

Rene P. Martin, Natalia López Carranza, Rhiannon J. LaVine, Bruce S. Lieberman
Journal: Paleobiology
Published: 01 May 2023
Paleobiology (2023) 49 (2): 296–312.
DOI: https://doi.org/10.1017/pab.2022.39
...-based approach to ontogenetic shape change in the Ordovician trilobite Triarthrus becki . Pp. 67 – 82 in A. M. T. Elewa , ed., Morphometrics . Springer, Berlin...
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Is 3D, a more accurate quantitative method than 2D, crucial for analyzing disparity patterns in extinct marine arthropods (Trilobita)? Available to Purchase

Catherine Crônier, Sébastien Couette, Rémi Laffont
Journal: Paleobiology
Published: 01 November 2024
Paleobiology (2024) 50 (4): 563–581.
DOI: https://doi.org/10.1017/pab.2024.44
... Triarthrus becki . Paleobiology 28 : 364 – 377 . Kimmel , C. B. , C. M. Small , and M. L. Knope...
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