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Triarthrus eatoni

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Pyritized specimens of  <b>Triarthrus</b> <b>eatoni</b>  from the Ordovician Whetstone Gu...
in > Geology
Published: 01 March 2017
Figure 2. Pyritized specimens of Triarthrus eatoni from the Ordovician Whetstone Gulf Formation (Lorraine Group), upstate New York (USA). A: Ventrally preserved specimen (Yale Peabody Museum [YPM] 535703) showing nine eggs in the specimen’s left genal angle. B: Ventrally preserved specimen (YPM
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Fossils from trilobite beds. A) Ventral view of pyritized <b>Triarthrus</b> <b>eatoni</b>...
in > PALAIOS
Published: 01 November 2011
FIGURE 4— Fossils from trilobite beds. A) Ventral view of pyritized Triarthrus eatoni (YPM.516160 and 516161). B) Lateral view of pyritized Triarthrus eatoni (YPM.227952). C) Fully articulated unpyritized Triarthrus eatoni, (Bed 822, YPM.221894). D) Pyritized ostracode (Bed 906, YPM.307293). E
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FIGURE 7 —Trends in average abundance of  <b>Triarthrus</b> <b>eatoni</b>  (T),  Leptobol...
in > PALAIOS
Published: 01 March 2008
FIGURE 7 —Trends in average abundance of Triarthrus eatoni (T), Leptobolus insignis (L), and Rafinesquina sp. (R), in the Alexandria submember along the study transect. Vertical scale for all plots is relative abundance by visual estimate, where 0 = absent, 1 = rare, 2 = common, and 3
Journal Article
Journal: Geology
Published: 01 March 2017
Geology (2017) 45 (3): 199-202.
...Figure 2. Pyritized specimens of Triarthrus eatoni from the Ordovician Whetstone Gulf Formation (Lorraine Group), upstate New York (USA). A: Ventrally preserved specimen (Yale Peabody Museum [YPM] 535703) showing nine eggs in the specimen’s left genal angle. B: Ventrally preserved specimen (YPM...
FIGURES
Journal Article
Journal: Paleobiology
Published: 01 January 2002
Paleobiology (2002) 28 (3): 364-377.
... trilobite species, including Triarthrus eatoni , for the first time. Raw (1925) proposed the terms meraspid and holaspid periods for later successive developmental stages of trilobites. He defined the meraspid period as the series beginning with subdivision of the protaspis into cephalon and transitory...
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Journal Article
Journal: PALAIOS
Published: 01 November 2011
PALAIOS (2011) 26 (11): 730-742.
...FIGURE 4— Fossils from trilobite beds. A) Ventral view of pyritized Triarthrus eatoni (YPM.516160 and 516161). B) Lateral view of pyritized Triarthrus eatoni (YPM.227952). C) Fully articulated unpyritized Triarthrus eatoni, (Bed 822, YPM.221894). D) Pyritized ostracode (Bed 906, YPM.307293). E...
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Journal Article
Published: 01 January 2005
Journal of Paleontology (2005) 79 (1): 89-109.
... hours picking samples of appropriate size fractions from these levels, suggests that either this species lacked sclerotized protaspid growth stages, or they are rare. A similar situation pertains to Triarthrus eatoni ( Hall, 1838 ) from Beecher's Trilobite Bed, in which the preserved record...
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New soft-bodied and delicate fossils from the new Beecher's-type beds. A: V...
in > Geology
Published: 01 October 2009
Figure 2. New soft-bodied and delicate fossils from the new Beecher's-type beds. A: Ventral view of Triarthrus eatoni (Yale Peabody Museum, YPM 509231); note ostracod (arrowed, YPM 223943), like that in C, splayed across its midline. B: Lateral view of Triarthrus eatoni (YPM 223935). C
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Figure  8. A–C, Three examples of trilobite ontogenies known from articulat...
Published: 01 December 2006
Figure 8. A–C, Three examples of trilobite ontogenies known from articulated material with thoracic segment numbers directly observed. A, Triarthrus eatoni showing synarthromeric development. B, Ctenopyge ( Eoctenopyge ) angusta showing hypoprotomeric development. C, Shumardia ( Conophyrs
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Representative Upper Ordovician trilobite occurrences. (A, B) Trilobites fr...
in > PALAIOS
Published: 01 May 2012
of Triarthrus eatoni (Hall, 1838) showing possible current alignment (scale bar 1 cm). C) Ceraurus pleurexanthemus Green, 1832; (MCZ 111708), 38 mm long (sag.), from the upper surface of a layer, Upper Ordovician Rust Formation, Trenton Group, Walcott-Rust Quarry, Trenton Falls, New York (A, B, adapted from
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FIGURE 5 —Fossil event beds in the Alexandria submember of Kope Formation. ...
in > PALAIOS
Published: 01 March 2008
and anal tube in center of view; cycle 29. D) Cluster of articulated molts (thoracopygidia missing cephala) of Triarthrus eatoni molt bed from cycle 28, preserved as both external molds and some original skeletal elements; oriented top upward. E) Articulated small specimen of Isotelus cf. I. maximus
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Figure  3. Trunk segmentation schedules for selected trilobite taxa. Note t...
Published: 01 December 2006
the case for holaspids in the epimorphic phase. A, Triarthrus eatoni based on descriptions of Whittington (1957) and Cisne (1973) , excluding the protaspids assigned by Cisne (1973) to that species. Synarthromeric development. B, Ctenopyge ( Eoctenopyge ) angusta based on Clarkson et al. (2003
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Updated summary of trilobites reported with preserved appendages, supplemen...
Published: 05 April 2017
Llanvirn Mudstone mould Whittington, 1993 Triarthrus eatoni Ptychopariida Olenidae ++ ++ ++ + Ord. Katian Beecher's-type beds Pyritic Cisne, 1975 , 1981 ; Whittington & Almond, 1987 ; Farrell et al . 2009 Cryptolithus bellulus Asaphida Trinucleidae + + + o Mid.-Upp
Journal Article
Journal: Geology
Published: 01 October 2009
Geology (2009) 37 (10): 907-910.
...Figure 2. New soft-bodied and delicate fossils from the new Beecher's-type beds. A: Ventral view of Triarthrus eatoni (Yale Peabody Museum, YPM 509231); note ostracod (arrowed, YPM 223943), like that in C, splayed across its midline. B: Lateral view of Triarthrus eatoni (YPM 223935). C...
FIGURES
Journal Article
Published: 05 April 2017
Geological Magazine (2017) 154 (6): 1306-1328.
... Llanvirn Mudstone mould Whittington, 1993 Triarthrus eatoni Ptychopariida Olenidae ++ ++ ++ + Ord. Katian Beecher's-type beds Pyritic Cisne, 1975 , 1981 ; Whittington & Almond, 1987 ; Farrell et al . 2009 Cryptolithus bellulus Asaphida Trinucleidae + + + o Mid.-Upp...
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Journal Article
Journal: PALAIOS
Published: 01 March 2008
PALAIOS (2008) 23 (3): 174-184.
...FIGURE 7 —Trends in average abundance of Triarthrus eatoni (T), Leptobolus insignis (L), and Rafinesquina sp. (R), in the Alexandria submember along the study transect. Vertical scale for all plots is relative abundance by visual estimate, where 0 = absent, 1 = rare, 2 = common, and 3...
FIGURES | View All (7)
Journal Article
Journal: PALAIOS
Published: 01 December 2006
PALAIOS (2006) 21 (6): 530-547.
... the examined shale intervals. Shale biofacies are dominated by the trilobites Triarthrus eatoni and Pseudogygites latimarginatus ( Fig. 7 ) and small brachiopods, predominantly the orthid Onniella and linguloid and orbiculoid inarticulates ( Fig. 8 ; Supplementary Data files 1 and 2 1 ). Additional...
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Journal Article
Journal: Paleobiology
Published: 01 December 2006
Paleobiology (2006) 32 (4): 602-627.
...Figure 8. A–C, Three examples of trilobite ontogenies known from articulated material with thoracic segment numbers directly observed. A, Triarthrus eatoni showing synarthromeric development. B, Ctenopyge ( Eoctenopyge ) angusta showing hypoprotomeric development. C, Shumardia ( Conophyrs...
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Journal Article
Published: 01 May 2006
Journal of Paleontology (2006) 80 (3): 496-513.
... and University of Kansas Press, Lawrence . Cisne , J. L. , 1975 , Anatomy of Triarthrus and the relationships of the Trilobita : Fossils and Strata , 4 . 45 – 63 . Cisne , J. L. , 1981 , Triarthrus eatoni (Trilobita): Anatomy of its exoskeletal, skeletomuscular, and digestive systems...
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Journal Article
Journal: PALAIOS
Published: 01 February 2006
PALAIOS (2006) 21 (1): 15-25.
...; Phacops sp. in Stürmer and Bergström, 1973 , fig. 5b, pl. 19, fig. b; Triarthrus eatoni in Cisne, 1981 , pl. 22, fig. 4; Dalmanitina socialis in Šnajdr, 1987 , pl. 3, fig. 14; Buenellus higginsi in Blaker and Peel, 1997 , fig. 28.2; Isotelus maximus in Babcock, 2003 , figs. 5.3, 5.5...
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