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Journal Article

The hypostome of Encrinurus variolaris and its relation to the cephalon Free

J. T. Temple
Published: 01 July 1954
Geological Magazine (1954) 91 (4): 315–318.
...J. T. Temple Abstract "The hypostome of a specimen of Encrinurus variolaris (Brongniart) from the Wenlock limestone (Silurian) is described with particular reference to the intricate shape of the lateral wing. This lies very closely underneath the axial furrow of the cephalon in the region...
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Journal Article

Etude statistique de l'evolution du cephalon chez les trilobites Proparia et Opistoparia Available to Purchase

Pierre Hupe
Published: 01 January 1950
Bulletin de la Société Géologique de France (1950) S5-XX (1-3): 9–24.
DOI: https://doi.org/10.2113/gssgfbull.S5-XX.1-3.9
...Pierre Hupe Abstract A statistical study of morphologic elements of the cephalon of proparian and opistoparian trilobites shows that the neotenic tendency is striking in the Proparia, which accounts for the increase in longevity and variability of both groups. GeoRef, Copyright 2004, American...
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Morphologically immature Wanneria cranbrookense Webster n. sp. from the Cranbrook Lagerstätte. (1) Smallest known cephalon, in phase 3 or 4 of development, internal mold, RBCM.EH2015.013.0151.003. (2) Cephalon in phase 4 of development, internal mold, RBCM.EH2015.013.0186.001. (3) Cephalon in phase 4 of development, internal mold, RBCM.EH2015.013.0247.002. (4) Cephalon in phase 4 of development, latex peel of external mold, RBCM.EH2015.013.0132.003. (5) Cephalon in phase 4 of development, latex peel of external mold, RBCM.EH2015.013.0132.002. (6) Cephalon in phase 4 of development, latex peel of external mold, RBCM.EH2015.013.0182.010. (7) Cephalon in phase 4 of development, internal mold, RBCM.EH2015.013.0127.001. (8) Cephalon in phase 4 of development, internal mold, RBCM.EH2015.013.0062.003. (9) Cephalon in early phase 5 of development, latex peel of external mold, RBCM.EH2015.013.0233.002. (10) Cephalon in early phase 5 of development, latex peel of external mold, RBCM.EH2015.013.0072.004. (11) Cephalon in early phase 5 of development, internal mold, RBCM.EH2015.013.0033.001. (12) Cephalon in early phase 5 of development, internal mold, RBCM.EH2015.013.0057.003. All scale bars 1 mm. All from Eager Formation at Locality B.

Morphologically immature Wanneria cranbrookense Webster n. sp. from the C... Open Access

Published: 01 July 2024
Figure 19. Morphologically immature Wanneria cranbrookense Webster n. sp. from the Cranbrook Lagerstätte. ( 1 ) Smallest known cephalon, in phase 3 or 4 of development, internal mold, RBCM.EH2015.013.0151.003. ( 2 ) Cephalon in phase 4 of development, internal mold, RBCM.EH2015.013.0186.001
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Morphologically immature specimens of Olenellus santuccii Webster n. sp. from the Cranbrook Lagerstätte. All in early phase 5 of cephalic development unless otherwise stated. (1) Cephalon in earliest phase 5 of development, RBCM.EH2015.013.0140.001. (2) Cephalon in earliest phase 5 of development, RBCM.EH2015.013.0107.001. (3) Cephalon in earliest phase 5 of development with partial thorax, latex peel of external mold, RBCM.EH2015.013.0090.001. (4) Cephalon, RBCM.EH2015.013.0182.001. (5) Cephalon, RBCM.EH2015.013.0208.001. (6) Cephalon, RBCM.EH2015.013.0130.001. (7) Cephalon in late phase 5 of cephalic development, RBCM.EH2015.013.0193.001. (8) Almost complete dorsal exoskeleton, latex peel of external mold, RBCM.EH2015.013.0002.001. (9) Cephalon, RBCM.EH2015.013.0007.002. (10) Cephalon, RBCM.EH2015.013.0100.004. Scale bars 1 mm in (1–7), 3 mm in (8–10). All from Eager Formation at Locality B.

Morphologically immature specimens of Olenellus santuccii Webster n. sp. ... Open Access

Published: 01 July 2024
Figure 8. Morphologically immature specimens of Olenellus santuccii Webster n. sp. from the Cranbrook Lagerstätte. All in early phase 5 of cephalic development unless otherwise stated. ( 1 ) Cephalon in earliest phase 5 of development, RBCM.EH2015.013.0140.001. ( 2 ) Cephalon in earliest phase
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Morphologically immature specimens of Olenellus santuccii Webster n. sp. from the Cranbrook Lagerstätte. All in phase 4 of cephalic development. (1) Cephalon, latex peel of external mold, RBCM.EH2015.013.0002.003. (2) Cephalon, RBCM.EH2015.013.0081.003. (3) Cephalon with partial thorax, latex peel of external mold, RBCM.EH2015.013.0246.001. (4) Cephalon, RBCM.EH2015.013.0006.004. (5), Cephalon, RBCM.EH2015.013.0154.004. All scale bars 1 mm. All from Eager Formation at Locality B.

Morphologically immature specimens of Olenellus santuccii Webster n. sp. ... Open Access

Published: 01 July 2024
Figure 7. Morphologically immature specimens of Olenellus santuccii Webster n. sp. from the Cranbrook Lagerstätte. All in phase 4 of cephalic development. ( 1 ) Cephalon, latex peel of external mold, RBCM.EH2015.013.0002.003. ( 2 ) Cephalon, RBCM.EH2015.013.0081.003. ( 3 ) Cephalon with partial
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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, dorsal view; 8–10, cephalon, GSC 134584, anterior, lateral and dorsal views; 11, cephalon, GSC 134585, dorsal view; 12, cephalon, GSC 134586, dorsal view; 13–15, cephalon, GSC 134587, lateral, anterior and dorsal views; 16, cephalon, GSC 134588, dorsal view; 17, cephalon, GSC 134589, dorsal view. All ×20 and all from HC 202.

Acmarhachis kindlei n. sp., Shallow Bay Formation, western Newfoundland. 1... Available to Purchase

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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Cephala of Mesonacis eagerensis (Best, 1952b) from the Cranbrook Lagerstätte. (1) Morphologically immature cephalon in phase 4 or 5 of development, internal mold, RBCM.EH2015.013.0086.001. (2) Tentatively assigned morphologically immature cephalon in early phase 5 of development, internal mold, RBCM.EH2015.013.0179.001. (3) Morphologically immature cephalon in early phase 5 of development, internal mold, RBCM.EH2015.013.0162.001. (4) Morphologically mature cephalon, internal mold, RBCM.EH2015.013.0191.002. (5) Morphologically mature cephalon, latex peel of external mold, RBCM.EH2015.013.0199.001. (6) Largest known morphologically mature cephalon, internal mold, RBCM.EH2015.013.0212. Scale bars 1 mm in (1–3), 3 mm in (4–6). All from Eager Formation at Locality B.

Cephala of Mesonacis eagerensis (Best, 1952b ) from the Cranbrook Lagers... Open Access

Published: 01 July 2024
Figure 13. Cephala of Mesonacis eagerensis (Best, 1952b ) from the Cranbrook Lagerstätte. ( 1 ) Morphologically immature cephalon in phase 4 or 5 of development, internal mold, RBCM.EH2015.013.0086.001. ( 2 ) Tentatively assigned morphologically immature cephalon in early phase 5
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Pseudagnostus cf. P. communis (Hall and Whitfield, 1877), Shallow Bay Formation, western Newfoundland. 1–3, cephalon, GSC 134524, dorsal, lateral and anterior views; 4, cephalon, GSC 134525, dorsal view; 5, cephalon, GSC 134526, dorsal view; 6, cephalon, GSC 135368, dorsal view; 7–9, cephalon, GSC 134527, dorsal, lateral and anterior views; 10–12, cephalon, GSC 134528, lateral, anterior and dorsal views; 13, cephalon, GSC 134529, dorsal view; 14, cephalon, GSC 134530, dorsal view; 15, cephalon, GSC 134531, dorsal view. All from boulder CH 49 and all ×12, except Figure 6.5, 6.13, 6.15 (all ×20) and Figure 6.10–6.12 (×20).

Pseudagnostus cf. P. communis ( Hall and Whitfield, 1877 ), Shallow Bay For... Available to Purchase

Published: 01 March 2012
F igure 6 Pseudagnostus cf. P. communis ( Hall and Whitfield, 1877 ), Shallow Bay Formation, western Newfoundland. 1–3 , cephalon, GSC 134524, dorsal, lateral and anterior views; 4 , cephalon, GSC 134525, dorsal view; 5 , cephalon, GSC 134526, dorsal view; 6 , cephalon, GSC 135368, dorsal
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Homagnostus cf. H. alaskensis Palmer, 1968, Shallow Bay Formation, western Newfoundland. 1, cephalon, GSC 134560, dorsal view; 2, cephalon, GSC 134561, dorsal view; 3, cephalon, GSC 134562, dorsal view; 4, cephalon, GSC 134563, dorsal view; 5, cephalon, GSC 134564, dorsal view; 6, cephalon, GSC 134565, dorsal view; 7, cephalon, GSC 134566, dorsal view; 8–10, cephalon, GSC 134567, lateral, anterior and dorsal views; 11, cephalon, GSC 134568, dorsal view; 12, cephalon, GSC 134569, dorsal view; 13, cephalon, GSC 134570, dorsal view; 14, 15, pygidium, GSC 134571, lateral and dorsal views; 16, pygidium, GSC 134572, dorsal view; 17 pygidium, GSC 134573, dorsal view; 18–20, pygidium, GSC 134574, lateral, dorsal and posterior views; 21, pygidium, GSC 134575, dorsal view; 22, pygidium, GSC 134576, dorsal view; 23, pygidium, GSC 134577, dorsal view; 24, 25, pygidium, GSC 134578, lateral and dorsal views. All ×20 and all from boulder HC 202 except Figure 12.16 (collection HC 166).

Homagnostus cf. H. alaskensis Palmer, 1968 , Shallow Bay Formation, wester... Available to Purchase

Published: 01 March 2012
F igure 12 Homagnostus cf. H. alaskensis Palmer, 1968 , Shallow Bay Formation, western Newfoundland. 1 , cephalon, GSC 134560, dorsal view; 2 , cephalon, GSC 134561, dorsal view; 3 , cephalon, GSC 134562, dorsal view; 4 , cephalon, GSC 134563, dorsal view; 5 , cephalon, GSC 134564, dorsal
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(1, 2) Omegops honggulelengensis n. sp.: (1) length versus width of cephalon; (2) length of cephalon versus maximum width of glabella. (3, 4) Omegops xiangi n. sp.: (3) length versus width of cephalon; (4) length of cephalon versus maximum width of glabella. From the Hongguleleng Formation in western Junggar, NW China.

( 1, 2 ) Omegops honggulelengensis n. sp.: ( 1 ) length versus width of c... Available to Purchase

Published: 01 July 2023
Figure 3. ( 1, 2 ) Omegops honggulelengensis n. sp.: ( 1 ) length versus width of cephalon; ( 2 ) length of cephalon versus maximum width of glabella. ( 3, 4 ) Omegops xiangi n. sp.: ( 3 ) length versus width of cephalon; ( 4 ) length of cephalon versus maximum width of glabella. From
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 Figure16—Silicified specimens representing the ontogenetic development of the cephalon of Nephrolenellus geniculatus (phase 4). 1–3, Coarsely silicified cephalon, dorsal, anterior, and right lateral views, UCR 9963.17, ×10. Tip of left genal spine missing. 4–6, Coarsely silicified cephalon, dorsal, anterior, and left lateral views, UCR 9963.18, ×8. 7–9, Cephalon, dorsal, anterior, and right lateral views, UCR 9963.21, ×8. Left genal spine missing. 10–13, Cephalon, dorsal, anterior, right lateral, and oblique right anterolateral views, UCR 9963.19, ×8. 14, Incomplete cephalon, dorsal view, FMNH PE57956, ×8. 15, Incomplete cephalon, dorsal view, FMNH PE57966, ×8. 16, Incomplete cephalon, dorsal view, FMNH PE57962, ×8. 17–19, Fractured cephalon, dorsal, anterior, and right lateral views, FMNH PE57971, ×7. 20–23, Incomplete cephalon, dorsal, ventral, anterior, and right lateral views, FMNH PE57972, ×6. 24–27, Incomplete cephalon, dorsal, anterior, and left lateral views, FMNH PE57973, ×6. All specimens from ICS-1173, Hidden Valley section, Burnt Springs Range, Nevada. See text for stratigraphic details

Figure 16 —Silicified specimens representing the ontogenetic development o... Available to Purchase

Published: 01 November 2007
Figure 16 —Silicified specimens representing the ontogenetic development of the cephalon of Nephrolenellus geniculatus (phase 4). 1–3 , Coarsely silicified cephalon, dorsal, anterior, and right lateral views, UCR 9963.17, ×10. Tip of left genal spine missing. 4–6 , Coarsely silicified cephalon
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Omegops xiangi n. sp. from the Upper Devonian Famennian Hongguleleng Formation in western Junggar, NW China. (1–4) The exuvia consist of enrolled thoracopygon and isolated cephalon (BGEG–HB–04): (1, 3) dorsal and side views of exuvia; (2) dorsal view of pygidium and some thoracic segments; (4) close-up of left postocular pad. (5–7) Cephalon (BGEG–HB–49): (5) dorsal view; (6) side view; (7) close-up of intercalating ring. (8, 9) Incomplete cephalon (BGEG–HB–111): (8) dorsal view; (9) close-up of right postocular pad. (10, 11) Cephalon (BGEG–HB–32): (10) dorsal view; (11) ventral view. (12) Enrolled cephalon and thorax (BGEG–HB–68), dorsal view. (13, 14) Enrolled cephalon and thorax (BGEG–HB–16): (13) side view; (14) anterior view of cephalon. (15) Cephalon (BGEG–HB–86), dorsal view, part of the shell was detached, revealing impressions of S2 and S3 (white arrows). Specimen BGEG–HB–32 was collected from the Buninuer section; the other specimens were taken from the Bulongguoer section. Scale bars = 5 mm unless otherwise specified.

Omegops xiangi n. sp. from the Upper Devonian Famennian Hongguleleng Forma... Available to Purchase

Published: 01 July 2023
Figure 4. Omegops xiangi n. sp. from the Upper Devonian Famennian Hongguleleng Formation in western Junggar, NW China. ( 1–4 ) The exuvia consist of enrolled thoracopygon and isolated cephalon (BGEG–HB–04): ( 1, 3 ) dorsal and side views of exuvia; ( 2 ) dorsal view of pygidium and some
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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, dorsal view; 9, 10, cephalon, GSC 134605, lateral and dorsal views; 11, cephalon, GSC 134606, dorsal view. All ×20 and all from CH 57 except Figure 18.8 (HC 202).

Acmarhachis whittingtoni n. sp., Shallow Bay Formation, western Newfoundlan... Available to Purchase

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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Gogglops ensifer gen. et sp. nov., Horizon Yt22-2, Yaoxian Formation, Taoqupo, 11 km NW of Yaoxian, Shaanxi Province, China. (a–d, h) Holotype, incomplete cephalon, dorsal stereo-pair, anterior-oblique, lateral views, ×5, dorsal view of eye, ×15, dorsal view of central part of cephalon, ×10; NIGPAS 160534; (e, l) cephalon, dorsal, anterior views, ×4.5; NIGPAS 160535; (f) dorsal view, ×6.0; NIGPAS 160536; (g, k) cephalon, dorsal, lateral views, ×4.5; NIGPAS 160537; (i, o, p) cephalon, lateral, dorsal, anterior views, ×4.7; NIGPAS 160538; (j, m) cephalon, anterior, dorsal views, ×5.0; NIGPAS 160539; and (n) cephalon lacking eyes, anterior-oblique view, ×6; NIGPAS 160540.

Gogglops ensifer gen. et sp. nov., Horizon Yt22-2, Yaoxian Formation, Taoq... Available to Purchase

Published: 24 April 2017
Figure 5. Gogglops ensifer gen. et sp. nov., Horizon Yt22-2, Yaoxian Formation, Taoqupo, 11 km NW of Yaoxian, Shaanxi Province, China. (a–d, h) Holotype, incomplete cephalon, dorsal stereo-pair, anterior-oblique, lateral views, ×5, dorsal view of eye, ×15, dorsal view of central part
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 Figure13—Morphologically mature cephala of Eopeachella angustispina. 1, poorly preserved, exfoliated cephalon in early phase 5 of development, dorsal view, FMNH PE58066, ×10; 2, incomplete and exfoliated cephalon, dorsal view, FMNH PE58065, ×7; 3, exfoliated cephalon, dorsal view, FMNH PE58064, ×5; 4, mostly exfoliated cephalon, dorsal view, FMNH PE58063, ×5; 5, incomplete and exfoliated cephalon, dorsal view, FMNH PE58067, ×4; 6, mostly exfoliated cephalon, dorsal view, FMNH PE58062, ×3; 7, incomplete and mostly exfoliated cephalon, dorsal view, FMNH PE58068, ×4. All specimens from ICS-1003, Oak Spring Summit section, Delamar Mountains, Lincoln County, Nevada. See text for stratigraphic details

Figure 13 —Morphologically mature cephala of Eopeachella angustispina . ... Available to Purchase

Published: 01 March 2009
Figure 13 —Morphologically mature cephala of Eopeachella angustispina . 1, poorly preserved, exfoliated cephalon in early phase 5 of development, dorsal view, FMNH PE58066, ×10; 2, incomplete and exfoliated cephalon, dorsal view, FMNH PE58065, ×7; 3, exfoliated cephalon, dorsal view, FMNH
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 Figure9—Silicified specimens representing the ontogenetic development of the cephalon of Nephrolenellus multinodus (phases 3 and 4). 1–4, Slightly broken cephalon in phase 3 of development, dorsal, ventral, right lateral, and anterior views, FMNH PE57898, ×13. 5–8, Incomplete cephalon in phase 3 of development, dorsal, left lateral, anterior, and oblique left anterolateral views, UCR 9949.9, ×12. 9–12, Incomplete cephalon in phase 3 of development, dorsal, ventral, left lateral, and anterior views, FMNH PE57894, ×10. 13, Slightly broken cephalon in phase 3 of development, dorsal view, FMNH PE57900, ×10. 14–17, Cephalon in phase 4 of development, dorsal, ventral, right lateral, and anterior views, FMNH PE57925, ×10. 18, Incomplete cephalon in phase 4 of development, dorsal view, FMNH PE57941, ×9. 19, Incomplete cephalon in phase 4 of development, dorsal view, FMNH PE57927, ×8. 20, Incomplete cephalon in phase 4 of development, dorsal view, FMNH PE57932, ×8 21, Incomplete cephalon in phase 4 of development, dorsal view, FMNH PE57895, ×8. 22, 23, Incomplete cephalon in phase 4 of development, dorsal and left lateral views, FMNH PE57899, ×8. 24, Incomplete cephalon in phase 4 of development, dorsal view, FMNH PE57897, ×8. 25, 26, Incomplete cephalon in phase 4 of development, dorsal and ventral views, FMNH PE57902, ×7. Specimens in figures 1–4, 9–13, and 21–26 from ICS-1158, Oak Spring Summit section, Delamar Mountains, Nevada. Specimens in figures 14–17, 19, 20, from ICS-1279, Hidden Valley section, Burnt Springs Range, Nevada. Specimen in figure 18 from ICS-1049, Ruin Wash section, Chief Range, Nevada. Specimens in figures 5–8 from Groom Range, Nevada. See text for stratigraphic details

Figure 9 —Silicified specimens representing the ontogenetic development of... Available to Purchase

Published: 01 November 2007
Figure 9 —Silicified specimens representing the ontogenetic development of the cephalon of Nephrolenellus multinodus (phases 3 and 4). 1–4 , Slightly broken cephalon in phase 3 of development, dorsal, ventral, right lateral, and anterior views, FMNH PE57898, ×13. 5–8, Incomplete cephalon
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Species of Olenellus Hall, 1861, from the upper Olenellus Zone, Northwest Territories: (1–4, 6, 10) Olenellus gilberti Meek in White, 1874; (1, 2) cephalon (dorsal, oblique) GSC 142281, sandy limestone, Mount Clark Formation, Dodo Canyon; (3) partially complete cephalon (dorsal) GSC 142282, silty mudstone, Mount Cap Formation, Inlin Brook; (4) fractured cephalon (dorsal) GSC 142283, silty mudstone, Mount Cap Formation, Inlin Brook; (6) cephalon (dorsal) GSC 142284, sandstone, Mount Clark Formation, measured section 12-MWB-05; (10) cephalon (dorsal) GSC 142285, carbonate, Mount Clark Formation, measured section 12-MWB-06. (5, 7, 9) Olenellus terminatus Palmer, 1998b; (5) cephalon (dorsal, latex mold) GSC 142286, silty mudstone, Mount Cap Formation, Little Bear River; (7) possible fractured hypostome (dorsal) GSC 142287, silty mudstone, Mount Cap Formation, Inlin Brook; (9) partially complete cephalon (dorsal) GSC 142287, silty mudstone, Mount Cap Formation, Inlin Brook. (8) Olenellid gen. and sp. indet., partially complete cephalon (dorsal) GSC 142288, lime mudstone, Mount Cap Formation, Little Bear River. All scale bars = 2 mm.

Species of Olenellus Hall, 1861 , from the upper Olenellus Zone, North... Available to Purchase

Published: 01 June 2022
Figure 8. Species of Olenellus Hall, 1861 , from the upper Olenellus Zone, Northwest Territories: ( 1 – 4 , 6 , 10 ) Olenellus gilberti Meek in White, 1874 ; ( 1 , 2 ) cephalon (dorsal, oblique) GSC 142281, sandy limestone, Mount Clark Formation, Dodo Canyon; ( 3 ) partially complete
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Figure3—1–5,Geragnostus cf. sidenbladhi (Linnarsson, 1869); 1, latex cast of cephalon, R 64787a, from Pt. TS9, ×8; 2, cephalon, R 64787b, from Pt. TS9, ×7.7; 3, pygidium, R 64788, from Pt. CM14, ×8.4; 4, pygidium, R 64789, from Pt. TS8, ×8.5; 5, latex cast of pygidium, R 64790, from Pt. BB91, ×7.5. 6, Geragnostus aff. sidenbladhi (Linnarsson, 1869), latex mold of cephalon, R 64791, from Pt. PV64, ×8.8. 7–21,Geragnostus crassusTjernvik, 1956; 7, cephalon, R 64792, from Pt. CM14, ×10.2; 8, cephalon, R 64793, from Pt. CM14, ×9.6; 9, cephalon, R 64794, from Pt. CM15, ×9.1; 10, cephalon, R 64795, from Pt. CM14, ×9; 11, cephalon, R 64796, from Pt. CM14, ×8.9; 12, latex cast of pygidium, R 64797, from Pt. TS8, ×13.5; 13, latex cast of pygidium, R 64798, from Pt. FL5, ×9.6; 14, pygidium, R 64799, from Pt. FL27, ×10.4; 15, cephalon, R 64800, from Pt. CM14, ×9.8; 16, cephalon, R 64801, from Pt. FL27, ×14; 17, pygidium, R 64802, from Pt. FL2, ×12.3; 18, pygidium, R 64803, from Pt. CM14, ×10.4; 19, pygidium, R 64804, from Pt. CM14, ×11; 20, cephalon, R 64805, from Pt. FL34, ×13.3; 21, cephalon, R 64806, from Pt. CM14, ×12.5. 22, Geragnostus cf. explanatusTjernvik, 1956, latex cast of cephalon, R 64807, from Pt. PV85, ×7.5. 23, 24, Geragnostus splendens (Holub, 1912); 23, latex cast of cephalon, R 64808, from Pt. PV74, ×9.1; 24, pygidium, R 64809, from Pt. SC85, ×11.5. 25–27, Geragnostus cf. explanatus; 25, cephalon, R 64810, from Pt. PV85, ×7.2; 26, pygidium (enrolled specimen), R 64811, from Pt. CS52, ×7.4; 27, pygidium, R 64812, from Pt. CS52, ×9.

Figure 3 — 1–5, Geragnostus cf. sidenbladhi ( Linnarsson, 1869 ); 1 ,... Available to Purchase

Published: 01 May 2006
Figure 3 — 1–5, Geragnostus cf. sidenbladhi ( Linnarsson, 1869 ); 1 , latex cast of cephalon, R 64787a, from Pt. TS9, ×8; 2 , cephalon, R 64787b, from Pt. TS9, ×7.7; 3 , pygidium, R 64788, from Pt. CM14, ×8.4; 4 , pygidium, R 64789, from Pt. TS8, ×8.5; 5 , latex cast of pygidium, R 64790
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Omegops honggulelengensis n. sp. from the Upper Devonian Fammenian Hongguleleng Formation in western Junggar, NW China. (1–7) Cephalon (BGEG–HB–59): (1) dorsal view; (2) left side view; (3) right side view; (4) anterior view; (5) ventral view; (6, 7) close-ups of the intercalating ring (6) and postocular pad (7). (8) The exuvia consist of enrolled thoracopygon and isolated cephalon (BGEG–HB–55), ventral view of cephalon, and dorsal view of thoracopygon. (9–12) Cephalon (BGEG–HB–03): (9) dorsal view; (10) ventral view; (11) left side; (12) anterior view. (13) Incomplete cephalon (BGEG–HB–178), dorsal view; part of the shell was detached, revealing impressions of S2 and S3 (white arrows). (14, 15) Enrolled cephalon and thorax (BGEG–HB–05): (14) dorsal view; (15) right side view. (16) Cephalon (BGEG–HB–02), dorsal view. Specimen BGEG–HB–178 was collected from the Bulongguoer section; the other specimens were taken from the Buninuer section. Scale bars = 5 mm unless otherwise specified.

Omegops honggulelengensis n. sp. from the Upper Devonian Fammenian Honggul... Available to Purchase

Published: 01 July 2023
Figure 2. Omegops honggulelengensis n. sp. from the Upper Devonian Fammenian Hongguleleng Formation in western Junggar, NW China. ( 1–7 ) Cephalon (BGEG–HB–59): ( 1 ) dorsal view; ( 2 ) left side view; ( 3 ) right side view; ( 4 ) anterior view; ( 5 ) ventral view; ( 6, 7 ) close-ups
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Fig. 3.

Bristolia kurtzi n. sp., from the Rabbit Point Formation, Devon Island. (... Available to Purchase

Published: 31 October 2011
Fig. 3. Bristolia kurtzi n. sp., from the Rabbit Point Formation, Devon Island. (A, P) Cephalon and detail of genal spine (P, ×3.8), respectively, NMW 2011.18G.6 from J.W. Cowie collection 1927, ×2.25. (B) Cephalon, NMW 2011.18G.7 from J.W. Cowie collection 1927, ×2.25. (C) Hypostome, NMW