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519 results for “Trilobites”
Fig 1 in A new Cambrian catillicephalid trilobite from the Shallow Bay Formation of western Newfoundland, Canada
Fig 1. Cranidia of catillicephalid trilobite Catillicephala cifellii sp. nov. from the Downes Point Member, Shallow Bay Formation, Guzhangian, Miaolingian, Cambrian; boulder BPS 467, Broom Point South, western Newfoundland, Canada. A. GSC 142512, holotype; dorsal (A1), lateral (A2), and anterior (A3) views. B. GSC 142513, paratype; dorsal view. C. GSC 142514, paratype; dorsal (C1), lateral (C2), and anterior (C3) views. D. GSC 142515, paratype; dorsal view. Scale bars 1 mm.
Fig. 3 in A new Cambrian catillicephalid trilobite from the Shallow Bay Formation of western Newfoundland, Canada
Fig. 3. Pygidia of catillicephalid trilobite Catillicephala cifellii sp. nov. from the Downes Point Member, Shallow Bay Formation, Guzhangian, Miaolingian, → Cambrian; boulder BPS 467, Broom Point South, western Newfoundland, Canada. A. GSC 142520, paratype; dorsal (A1), lateral (A2), and posterior (A3) views. B. GSC 142521, paratype; posterior (B1), dorsal (B2), and lateral (B3) views. C. GSC 142522, paratype; posterior (C1) and dorsal (C2) views. D. GSC 142523, paratype; posterior (D1) and dorsal (D2) views. E. GSC 142524, paratype; dorsal view. Scale bars 1 mm.
FIGURE 2 in Geometric morphometric assessment of Guanshan trilobites (Yunnan Province, China) reveals a limited diversity of palaeolenid taxa
FIGURE 2. Reconstruction of the Palaeolenus douvilei cephalon showing chosen landmarks and semilandmarks. Blue outlines show semilandmarks placement. White arrows indicate semilandmarks trajectory. The black lines show the orientations which are following Whittington et al. (1997). Abbreviations: sag. – sagittal; tr. – transverse; exs. – exsagittal.
FIGURE 3 in Geometric morphometric assessment of Guanshan trilobites (Yunnan Province, China) reveals a limited diversity of palaeolenid taxa
FIGURE 3. Plots of principal component analyses. A. Plot of PC1-PC2 space where two main clusters are identified. Cluster in more positive PC1 space contains Palaeolenus douvillei specimens and the cluster in more negative PC1 space contains Megapalaeolenus deprati specimens. Thin-plate spline indicates the extreme shape for each axis. B. Plot of PC2-PC3 space showing no distinct clusters. C. Plot of PC1-PC3 space showing two distinct clusters of the P. douvillei and M. deprati. Clusters are all bound by convex hulls of proposed taxa.
FIGURE 1. Geological and biostratigraphical maps. A in Geometric morphometric assessment of Guanshan trilobites (Yunnan Province, China) reveals a limited diversity of palaeolenid taxa
FIGURE 1. Geological and biostratigraphical maps. A. The Shitangshan Section showing approximate stratigraphic distribution of Redlichia mansuyi and Redlichia mai (modified from Hu et al. 2010). B–D. Studied sections showing their approximate stratigraphic levels respectively in Wulongqing Formation. B. Huanglongqing Section. C. Longbaoshan Section. D. Xinglongcun Section. E. Map of Kunming showing the localities of studied sections. The red lines with arrows showing approximate sampling interbeds in each section.
FIGURE 6 in Geometric morphometric assessment of Guanshan trilobites (Yunnan Province, China) reveals a limited diversity of palaeolenid taxa
FIGURE 6. Articulated and disarticulated specimens of Megapalaeolenus deprati from the Huanglongqing Section. A. HLQ-39A. B. HLQ-19. C. HLQ-37. D. HLQ-50. E. HLQ-13. F. HLQ-33. Scale bars equal 5 mm.
FIGURE 5 in Geometric morphometric assessment of Guanshan trilobites (Yunnan Province, China) reveals a limited diversity of palaeolenid taxa
FIGURE 5. Articulated specimens of Palaeolenus douvillei from the Longbaoshan and Xinglongcun sections. A. LBS- 548. B. XLC-1960. C. LBS-566. D. XLC-2000A. E. LBS-661A. F. LBS-151. G. XLC-0904. H. LBS-629. I. LBS-177. Scale bars equal 3 mm. White arrows indicate the thorax-pygidium boundary.
FIGURE 4 in Geometric morphometric assessment of Guanshan trilobites (Yunnan Province, China) reveals a limited diversity of palaeolenid taxa
FIGURE 4. The log-centroid size against regressed Procrustes ANOVA scores plot indicates the distinct clusters of the Palaeolenus douvillei and Megapalaeolenus deprati. Clusters bound by convex hulls of taxa. Hollow circles around points indicate specimens with 13 tergites and hollow pentagons around points indicate specimens with at least 14 tergites.
Fig. 2 in A new Cambrian catillicephalid trilobite from the Shallow Bay Formation of western Newfoundland, Canada
Fig. 2. Cranidia of catillicephalid trilobite Catillicephala cifellii sp. nov. from the Downes Point Member, Shallow Bay Formation, Guzhangian, Miaolingian, Cambrian; boulders BPS 468 (A), BPS 467 (B, D), BPS 458 (C), Broom Point South, western Newfoundland, Canada. A. GSC 142516, paratype; dorsal (A1), lateral (A2), and anterior (A3) views. B. GSC 142517, paratype; anterior (B1), lateral (B2), and dorsal (B3) views. C. GSC 142518, paratype; dorsal (C1), anterior (C2), and lateral (C3) views. D. GSC 142519, paratype; dorsal view. Scale bars 1 mm.
Fig. 7 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 7. Chart showing the frequency distribution of numbers of denticles on lateral margins of complete librigenae of Staurocephalus oliveae sp. nov. from the upper Katian (Upper Ordovician) Sholeshook Limestone Formation at Talfan Farm, Llanddowror, Carmarthenshire, Wales, UK. n = 36.
Fig. 3 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 3. Encrinurid trilobite Staurocephalus oliveae sp. nov. from the upper Katian (Upper Ordovician) Sholeshook Limestone Formation at Talfan Farm, Llanddowror, Carmarthenshire, Wales, UK. A. Holotype, NMW 2013.11G.1, cephalon in dorsal (A1), oblique anterolateral (A2), and frontal (A3) views. B. Paratype, NMW 2013.11G.2, cephalon in dorsal (B1), oblique anterolateral (B2), and dorsolateral (B3) views. C. Paratype, NMW 2013.11G.6, cranidium in dorsal view. D. Paratype, NMW 2013.11G.7, partial cranidium, dorsal view of internal mould (D1), ventral view of external mould (D2), and latex cast of external mould (D3). E. Paratype, NMW 2013.11G.8, cephalon, external mould in ventral view (E1) and latex cast of external mould (E2). F. Paratype, NMW 2013.11G.9, genal angle of cranidium, showing marginal denticles decreasing in size posteriorly. Scale bars 2 mm, except F 1 mm.
Fig. 6 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 6. Historic specimens of the encrinurid trilobite Staurocephalus from museum collections. A. SM A31592, cranidium in dorsal view labelled Staurocephalus cf. murchisoni Barrande" from the Sholeshook Limestone Formation (upper Katian, Upper Ordovician) in the Sholeshook railway cutting, Haverfordwest area, herein assigned to S. oliveae sp. nov.? B. BIRUG 48862, cranidium in dorsal view labelled "Staurocephalus cf. murchisoni" from the lower Tre-wylan Beds (Cautleyan) (upper Katian, Upper Ordovician) in the Llansantffraid-ym-Mechain district of the south-eastern Berwyn Hills, Mid Wales (Whittington 1938: 451, locality 42), herein assigned to S. oliveae sp. nov.? C, D. Specimens from the King collection, Sedgwick Museum, from the (locally) basal Ashgill mudstones (lower Rawtheyan, Ashgill Zone 5) (upper Katian, Upper Ordovician) of Aber Marchnant, Berwyn Hills, Mid Wales, originally identified as Staurocephalus cf. murchisoni by King (1923) and assigned to S. clavifrons by Whittington (1968), herein assigned to S. aff. oliveae. C. SM A39813, incomplete cranidium in dorsal view. D. SM A39814.A, incomplete cranidium in dorsal view (D1) and close up of left genal area (D2) to show large lateral denticles (arrowed). E. SM A31589, dorsal view of incomplete cranidium labelled "Staurocephalus globiceps" from the Marr collection, Sedgwick Museum, from the Slade and Redhill Mudstone Formation at Pelcomb Cross, Haverfordwest, herein assigned to S. cf. clavifrons. Note the prominent genal spine on the right side. Scale bars 1 mm, except D2 0.5 mm.
Fig. 2 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 2. Stratigraphical column showing the age of the Sholeshook Limestone Formation (in blue) and the underlying and overlying formations together with the shelly and chitinozoan biozonations of the Anglo-Welsh succession. Asterisk shows approximate age of the Talfan Farm locality, in the lower part of the formation (equivalent to Cautleyan Zone 1).
Fig. 5 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 5. Reconstruction drawings of the encrinurid trilobite Staurocephalus oliveae sp. nov. A. Cephalon, in anterior (A1), left lateral (A2), ventral (A3), and dorsal (A4) views. B. Pygidium, in ventral (B1) and dorsal (B2) views. Cephalon has a mean maximum width (tr.) of 10.15 mm; pygidium has a mean maximum width (tr.) of 3.96 mm.
Fig. 4 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 4. Encrinurid trilobite Staurocephalus oliveae sp. nov. from the upper Katian (Upper Ordovician) Sholeshook Limestone Formation at Talfan Farm, Llanddowror, Carmarthenshire, Wales, UK. A. Paratype, NMW 2013.11G.5, rostral plate in ventral view. B. Paratype, NMW 2013.11G.3, right librigena in lateral view. C. Paratype, NMW 2013.11G.10, left librigena in lateral view. D. Paratype, NMW 2013.11G.12, right librigena in lateral view. E. Paratype, NMW 2013.11G.13, thoracic segment in dorsal view. F. Paratype, NMW 2013.11G.4, pygidium in dorsal view. G. Paratype, NMW 2013.11G.11, pygidium in dorsal view. H. Paratype, NMW 2013.11G.15, pygidium in ventral view of external mould (H1) and latex cast of external mould (H2). Scale bars 2 mm.
Fig. 8 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 8. Graph showing the number of lateral denticles on librigenae of various Staurocephalus species through time. Circle represents the mean, vertical lines the range where one was observed in that species. Chatterton and Campbell (1980) described S. struszi as having "twelve (possibly eleven on some specimens)" denticles. Species names in black font represent occurrences in England and Wales, those in red font occur outside Avalonia. Note that Cautleyan and Rawtheyan are regional stages from the AngloWelsh chronostratigraphy and belong in the upper part of the international Katian Stage. The remaining stages are international. The Telychian is approximately twice the length of the other stages (e.g., Ogg et al. 2008: fig. 1.1), hence the wider spacing allocated to it.
Fig. 5 in Floian, Early Ordovician, trilobites from the Olongbluk Terrane, northwest China
Fig. 5. Asaphid trilobite Zhiyia tsinghaiensis (Chang and Fan, 1960), from the middle part of the Duoquanshan Formation (upper Floian, Lower Ordovician) of Shihuigou, Delingha, northern Qinghai Province, China. A. NIGP10115, holotype, cranidium (refigured from Chang and Fan 1960: 124, pl. 6: 10). B. NIGP 203164, cranidium. C. NIGP 203165, cranidium. D. NIGP 203166, cranidium. E. NIGP 203167, librigena. F. NIGP 203168, juvenile hypostome. G. NIGP 203169, hypostome. H. NIGP 203170, pygidium. I. NIGP 203171, pygidium. J. NIGP 203172, pygidium. K. NIGP 203173, pygidium. L. NIGP 203174, pygidium. M. NIGP 203175, pygidium. N. NIGP 203176, pygidium. Scale bars: A–E, G–N 5 mm; F 2 mm.
Fig. 1 in Floian, Early Ordovician, trilobites from the Olongbluk Terrane, northwest China
Fig. 1. The Ordovician palaeogeographic units of the Qilian and Qaidam regions (modified from Zhu et al. in press) (A), location of the Shihuigou section of Delingha, north Qinghai Province (B), and photograph of the middle part of the Duoquanshan Formation at the Shihuigou section and percentage data of trilobites from the sample SHG215a (C).
Fig. 4 in Floian, Early Ordovician, trilobites from the Olongbluk Terrane, northwest China
Fig. 4. Reconstruction of the asaphid trilobite Tsaidamaspis diarmatus Chang and Fan, 1960. Not to scale.
Fig. 7 in Floian, Early Ordovician, trilobites from the Olongbluk Terrane, northwest China
Fig. 7. Pliomerid trilobite Liexiaspis sp., from the middle part of the Duoquanshan Formation (upper Floian, Lower Ordovician) of Shihuigou, Delingha, northern Qinghai Province, China. A. NIGP 203177, pygidium. B. NIGP 203178, pygidium. Scale bars 2 mm.
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