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22 results for “Cambrian Stage 3”
Fig. 8 in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 8. Two conical fossils regarded as palaeoscolecid fragments from Khuhtolgoi section, northern Mongolia, Cambrian Stage 3. A. NRM X11556 in latero-abapical (A1) and latero-apical (A2) views, with a close-up on button-shaped elements (A3). B. NRM X11556 in latero-apical (B1, B2) views, with a close-up on button-shaped elements (B3).
Fig. 6 in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 6. Fibrous structures observed on elevations on the dorsal sides of palaeoscolecid Floraconformis egiinensis gen. et sp. nov., plate from Khuhtolgoi section, northern Mongolia, Cambrian Stage 3. these structures are only visible when the outer hyaline layer is absent. A. NRM X11499. B. NRM X11497.
Fig. 7 in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 7. Unusual plates of palaeoscolecid Floraconformis egiinensis gen. et sp. nov. from Khuhtolgoi section, northern Mongolia, Cambrian Stage 3. A. NRM X11467; two merged plates. B. NRM X11524; second and third-generation elevations are not elongated toward the margin but parallel to it. C. NRM X11510; absence of the usual larger central elevation.
Fig. 5 in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 5. Palaeoscolecid Floraconformis egiinensisgen. et sp. nov., plates (in ventral view) from Khuhtolgoi section, northern Mongolia, Cambrian Stage 3. A. NRM X11516; note the fingerprint-like ornamentation on this plate. B. NRM X11522. C. NRM X11498. D. NRM X11518. E. NRM X11501.
Fig. 4 in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 4. Palaeoscolecid Floraconformis egiinensis gen. et sp. nov., plates (in dorsal view) from Khuhtolgoi section, northern Mongolia, Cambrian Stage 3. A. NRM X11465. B. NRM X11493. C. NRM X11502. D. NRM X11492. E. NRM X11489. F. NRM X11497. G. NRM X11495. H. NRM X11521. I. NRM X11508. J. NRM X11505 in general (J1) and close-up (J2) views; the dashed line in J2 represents the second large elevation delimited from the brim mentioned in the diagnosis. K. NRM X11500. L. NRM X11513. M. NRM X11499. N. NRM X11490. O. NRM X11496. P. MNRM X11491. Q. NRM X11523. R. NRM X11463.
Fig. 3 in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 3. Palaeoscolecid Floraconformis egiinensis gen. et sp. nov., plate from Khuhtolgoi section, northern Mongolia, Cambrian Stage 3. Holotype NRM X11462 in dorsal (A1) and dorso-lateral (A2) views. The white arrow shows the small gap present on few plates, at the bound between inner and outer sides. The black arrow shows small tubercles that are present on the brim, when the outer hyaline layer is preserved.
Fig. 2 in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 2. Schematic drawing of palaeoscolecid Floraconformis egiinensis gen. et sp. nov. plate showing the terminology used, based on specimen NRM X11497; outer (A1) and inner (A2) side.
Fig. 1. A in New palaeoscolecid plates from the Cambrian Stage 3 of northern Mongolia
Fig. 1. A. Map of Mongolia showing location of the studied section. B. Precise location of the section Khuhtolgoi.
Fig. 5 in New artiopodan euarthropods from the Chengjiang fauna (Cambrian, Stage 3) at Malong, Yunnan, China
Fig. 5. Phylogenetic reconstruction of Artiopoda showing the placements of Zhugeia acuticaudata, Tonglaiia bispinosa gen. et sp. nov., and Sidneyia malongensis sp. nov. The three new artiopodan species are in bold and asterisked. A–E. Strict consensus trees from parsimony analyses. Bootstrap, jackknife and group present/contradicted supports are placed at the top left, bottom left, and middle right of nodes and are in regular, italics and bold, respectively. Nodal supports are all in percentage, and those of 100 are not shown. Individual trees can be found in the SOM: fig. 1A–D. Results from using implied weighting of characters under various concavity values k. A. k = 3. Note that the result with k = 2 differs from that with k = 3 only in the placement of Neostrabops martini and the relationships between cheloniellids. B. k = 4, 5. C. k = 6–9. D. Results under k = 10, 20 only differ from those under k = 6–9 in the interrelationships of Xandarellida. E. Results from using equal weighting of characters, where concavity value k = ∞. F. 50% majority-rule consensus tree from Bayesian inference under the Mkv + gamma model. Nodal supports represent posterior probabilities in percentage, and those of 100 are not shown.
Fig. 4 in New artiopodan euarthropods from the Chengjiang fauna (Cambrian, Stage 3) at Malong, Yunnan, China
Fig. 4. Artiopodan euarthropod Sidneyia malongensis sp. nov. from the Cambrian Stage 3 Chengjiang fauna at Malong, Yunnan, China; paratype NIGP 200052. A. Whole specimen under high-angle light (A1), under low-angle light (A2), interpretative drawing (A3). B. Thoracic tergites under high-angle light (B1), under low-angle light (B2). C. Abdomen. Abbreviations: as1–as2, abdominal segments; ce, cephalon; e, eye; t1–78, thoracic tergites; tf, tail fluke.
Fig. 3 in New artiopodan euarthropods from the Chengjiang fauna (Cambrian, Stage 3) at Malong, Yunnan, China
Fig. 3. Artiopodan euarthropod Sidneyia malongensis sp. nov. from the Cambrian Stage 3 Chengjiang fauna at Malong, Yunnan, China; holotype NIGP 200051. A. Whole specimen under high-angle light (A1), under low-angle light (A2), interpretative drawing (A3). B. Left eye under high-angle light (B1), under low-angle light (B2). C. Fourth to eighth thoracic tergites. D. Abdomen. Abbreviations: as1–as2, abdominal segments; ce, cephalon; e, eye; t1–t8, thoracic tergites; tf, tail fluke.
Fig. 2 in New artiopodan euarthropods from the Chengjiang fauna (Cambrian, Stage 3) at Malong, Yunnan, China
Fig. 2. Artiopodan euarthropod Tonglaiia bispinosa gen. et sp. nov. from the Cambrian Stage 3 Chengjiang fauna at Malong, Yunnan, China; holotype NIGP 200050. A. Whole specimen under high-angle light (A1), under low-angle light (A2), interpretative drawing (A3). B. Left eye. C. Left cephalic spine. D. Right cephalic spine. E. Right appendage. F. Thoracic tergites (F1) with spines (F2). G. Pygidium. Abbreviations: ap, appendage; ce, cephalon; cs, cephalic spine; e, eye; ml, marginal line around cephalon; pa, pleural angle; py, pygidium; sp, marginal spine; t1–t7, thoracic tergites; ts, terminal spine.
Fig. 11. The tommotiid Shetlandia multiplicata Wrona, 2004, unknown type sclerite fragments from the Cambrian Series 2, Stages 3, 4 in Camenellan tommotiids from the Cambrian Series 2 of East Antarctica: Biostratigraphy, palaeobiogeography, and systematics
Fig. 11. The tommotiid Shetlandia multiplicata Wrona, 2004, unknown type sclerite fragments from the Cambrian Series 2, Stages 3, 4, Shackleton Limestone, Holyoake Range, Transantarctic Mountains, East Antarctica. A. NRM X10020, general view (A1), detail showing arched growth series (A2). B. NRM X10021, general view (B1), detail of broken margin (B2). C. NRM X10022, general view (C1), detail of comarginal ribs and broken edge (C2). D. NRM X10023. E. NRM X10024. Scale bars 200 µm, except B2, 100 µm. A–C taken with backscattered electron detector.
Fig. 10. The tommotiid Kennardiidae indet. from the Cambrian Series 2, Stages 3, 4 in Camenellan tommotiids from the Cambrian Series 2 of East Antarctica: Biostratigraphy, palaeobiogeography, and systematics
Fig. 10. The tommotiid Kennardiidae indet. from the Cambrian Series 2, Stages 3, 4, Shackleton Limestone, Holyoake Range, Transantarctic Mountains, East Antarctica. A. Symmetrical first sclerite type, KUMIP 585077, apical view (A1), oblique view of posterior field (A2), lateral field (A3). B. Third sclerite type, KUMIP 585078, apical (B1) and lateral (B2) views. C. Third sclerite type, KUMIP 585079, apical view (C1), ventral side (C2), dorsal side (C3). D. Third sclerite type, KUMIP 585080, ventral side (D1), apical view (D2). E. Third sclerite type, KUMIP 233002, apical view (E1), detail of dorsal side (E2), detail of ventral side (E3), ventral side (E4). F. Third type of sclerite, KUMIP 585081, ventral side (F1), detail showing plicae on ventral surface (F2), distal edge (F3). G. Second type of sclerite, KUMIP 585082, apical view (G1), oblique view of posterior field (G2), lateral field (G3). H. Third type of sclerite, KUMIP 585083, posterior side (H1), distal edge (H2), apical view (H3). I. Third type of sclerite, KUMIP 585084, ventral side (I1), detail showing plicae on the ventral surface (I2). Scale bars 200 µm, except E2, E3, I2, 100 µm.
Fig. 7. The camenellan tommotiids from from the Cambrian Series 2, Stages 3, 4 in Camenellan tommotiids from the Cambrian Series 2 of East Antarctica: Biostratigraphy, palaeobiogeography, and systematics
Fig. 7. The camenellan tommotiids from from the Cambrian Series 2, Stages 3, 4, Shackleton Limestone, Transantarctic Mountains, East Antarctica. Dailyatia braddocki Evans and Rowell, 1990, Churchill Mountains (A, B), Dailyatia decobruta Betts in Betts et al., 2019, Holyoake Range (C–F), and Dailyatia cf. odyssei, Holyoake Range (G–I). A. C sclerite, NRM X10001, ventral view (A1), detail showing fold in the margin of the ventral field (A2). B. Sclerite of unknown chirality, NRM X10002, dorsal view (B1), detail showing apex (B2). C. Dextral C sclerite, KUMIP 585071, details showing micro-ornament on the anterior-lateral (C1) and the posterior (C3) fields, apical view (C2). D. Dextral C sclerite, KUMIP 585072, apical view (D1), view of proximal edge and dorsal field (D2). E. Sclerite of unknown chirality, KUMIP 585073, oblique view of ventral field (E1), view of apical area showing perforated apex (E2). F. Sclerite of unknown chirality, KUMIP 585074, dorsal (F1) and oblique apical (F2) views. G. Dextral C sclerite, NRM X10003, view of broken dorsal field (G1), detail showing fine growth series (G2), apex (G3), oblique basal view showing plicae at distal edge (G4). H. Sinistral C sclerite, NRM X10004, apical view (H1), oblique view of distal edge and part of ventral field (H2). I. Unknown sclerite type, NRM X10005, ventral view (I1), detail showing fine growth series (I2). Scale bars 200 µm, except E2, 50 µm.
Fig. 9. The camenellan tommotiid from the Cambrian Series 2, Stages 3, 4 in Camenellan tommotiids from the Cambrian Series 2 of East Antarctica: Biostratigraphy, palaeobiogeography, and systematics
Fig. 9. The camenellan tommotiid from the Cambrian Series 2, Stages 3, 4, Shackleton Limestone, Transantarctic Mountains, East Antarctica. Dailyatia sp. 1, C sclerites and indeterminate fragments, Holyoake Range and Churchill Mountains (A–G) and Dailyatia braddocki Evans and Rowell, 1990, Churchill Mountains (H, I). A. Dextral C sclerite, NRM X10013, apical view (A1), dorsal field (A2), proximal edge (A4), distal edge (A3), ventral field ( A5), detail showing broken apex (A6). B. Dextral C sclerite, NRM X10014, oblique view of distal edge and dorsal field (B1), oblique view of proximal edge and ventral field (B2), and apical view (B3). C. Sinistral C sclerite, NRM X10015, apical view (C1), oblique view of proximal edge and dorsal →
Fig. 3 in The endemic radiodonts of the Cambrian Stage 4 Guanshan Biota of South China
Fig. 3. Amplectobeluid radiodont "Anomalocaris" kunmingensis Wang, Huang, and Hu, 2013, from the Cambrian (Stage 4) Guanshan Biota, Lihuazhuang section, Yunnan, China. YKLP 12414, details of left frontal appendage (A1, A2), details of oral cone (A3, A4). Photographs (A1, A3) and explanatory drawing (A2, A4). Abbreviations: co, central opening; ds, dorsal spine; en, endite; lp?, putative left large plate; pd, podomere; pp? putative posterior plate; rp, right large plate; s?, shaft podomere; sp, small plate. Numbers indicate individual small plates between posterior and left plates.
Small shelly fossils and carbon isotopes from the early Cambrian (Stage 3-4) Mural Formation of western Laurentia
<p>The extraordinary window of phosphatised and phosphatic Small Shelly Fossils (SSFs) during the early and middle Cambrian is an important testament to the radiation of biomineralising metazoans. While SSF are well known from most Cambrian palaeocontinents during this time interval, western Laurentia has relatively few SSF faunas. Here we describe a diverse SSF fauna from the early Cambrian (Stage 3-4) Mural Formation at three localities in Alberta and British Columbia, Canada, complemented by carbon isotope measurements at two of the recorded sites to aid in a potential future bio-chemostratigraphic framework.. The fauna expands the recorded SSF assemblage diversity in western Laurentia and includes several brachiopods, four bradoriids, three chancelloriids, two hyoliths, a tommotiid and a helcionellid mollusc as well as echinoderm ossicles and specimens of <i>Microdictyon</i>, <i>Volborthella </i>and <i>Hyolithellus</i>. New taxa include the tommotiid genus <i>Canadiella</i> gen. nov., the new bradoriid species <i>Hipponicharion perforata</i> sp. nov. and <i>Pseudobeyrichona taurata</i> sp. nov. Compared to contemporaneous faunas from western Laurentia, the fauna is rich, particularly in taxa with originally phosphatic shells, which appear to be associated with archaeocyathid buildups. This suggests that the generally low faunal diversity in western Laurentia may be at least partly a consequence of poor sampling of suitable archaeocyathan reef environments. In addition, the tommotiid <i>Canadiella filigrana</i> appears to be of biostratigraphic significance in Cambrian Stage 3 strata of western Laurentia and the unexpected high diversity of bradoriid arthropods in the fauna also suggests that this group may prove useful for biostratigraphic resolution in the region.</p>
Small shelly fossils and carbon isotopes from the early Cambrian (Stage 3-4) Mural Formation of western Laurentia
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Data from: Ontogeny of the articulated yiliangellinine trilobite Zhangshania typica from the lower Cambrian (Series 2, Stage 3) of southern China
New discoveries of the early Cambrian yiliangellinine trilobite Zhangshania typica Li and Zhang in Kunming preserve almost all instars from early postembryonic (protaspid) to mature (holaspid) phases in articulated state, in addition to mature specimens with antennae bearing paired spines on the basal articles. The ontogenetic series shows protarthrous development with some, but likely not all, early holaspid instars expressing additional pygidial segments, gradual rearward migration of the location of the longest pleural spines on the trunk segments, and striking positive allometry of the genal spines. It also reveals Parazhangshania sichuanensis Li and Zhang, 1990 to be the holaspid stage 3 of Z. typica, and therefore its junior synonym. This new find in the Hongjingshao Formation provides species-based regional correlation across the South China block and Z. typica may provide an important biostratigraphic marker for the base of the traditional Tsanglangpuan Stage.
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