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875 results for “Brachiopod”
Fig. 5 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 5. Mickwitzia cf. occidens Walcott, fragment of mature shell MGUH 26298. A. Acrotretoid−type column with clusters of adhering cocci; scale bar 10 µm. B. Acrotretoid−type column entirely filled by centripetal lamination. Note the two single adhering cocci; scale bar 10 µm. C. Detail of single dome−shaped coccus attached to column; scale bar 2 µm. D. Acrotretoid−type column (left) entirely covered by attached and overlapping discoidal bodies (= deformed cocci) and some individual spheroidal cocci; scale bar 10 µm. E. Detail of surface of left column with overlapping discoidal structures; scale bar 2 µm. F. Aborted, dome−shaped acrotretoid−type column, with indications of annulations; scale bar 10 µm. G. Detail of top of aborted column in F, showing a finely platy cover; scale bar 2 µm. H. Cluster of cocci, with indication of asexual binary fission; scale bar 2 µm. I. Detail of central cocci in H, showing platy cover; scale bar 1 µm. J. Detail of cocci−covered lamina and columns; scale bar 5 µm. K. Detail of single spheroidal cocci attached to column; scale bar 2 µm. L. Detail of K, showing possible aperture. Note the platy appearance of the outer surface; scale bar 1 µm. The specimen is from the Ella Island Formation (sample GGU 314816).
Fig. 1 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 1. Stratigraphical subdivisions of the Lower Cambrian and location map of Northeast Greenland, with simplified stratigraphical logs. Sample numbers and levels indicated.
Fig. 13 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 13. Inferred distribution of setae (as indicated by nick−points) in juvenile (A) and early mature ventral valves of Mickwitzia cf. occidens Walcott.
Fig. 12 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 12. Mickwitzia cf. occidens Walcott. A. Fragmentary mature valve (indeterminate) MGUH 26317. A1. Exfoliated interior surface showing numerous acrotretoid−type columns and scattered large tubes, position of A2 and A3 indicated; scale bar 50 µm. A2. Detail of A1 showing single large tube with adhering cocci and numerous acrotretoid−type columns; scale bar 10 µm. A3. Detail of A1 showing numerous acrotretoid−type columns, some of which have a central canal of varying diameter or are completely filled; scale bar 10 µm. A4. Detail of A1 showing lamina perforated by empty large tube (marked by arrow) and +
Fig. 6 in New brachiopods from the Lower-Middle Ordovician (Billingen-Volkhov stages) of the East Baltic
Fig. 6. Bivariate plots of 51 measured specimens of Leoniorthis robusta. Solid rhombi represent specimens from Putilovo mud mound, open squares represent specimens from Popovka River, triangles represent specimens from Suhkrumägi road cut.
Fig. 5 in New brachiopods from the Lower-Middle Ordovician (Billingen-Volkhov stages) of the East Baltic
Fig. 5. Leoniorthis robusta gen. et. sp. nov. A–F. Specimens from Putilovo mud mound. G–J. Specimens from Popovka River. A. Holotype, PMU In 110, dorsal exterior (A1) and interior (A2). B. PMU In 111, ventral exterior. C. PMU In 145, ventral interior. D. PMU In 144, ventral interior. E. PMU In 120, dorsal interior (E1); enlargement of cardinal region (E2). F. PMU In 153, oblique view of hingeline and dorsal valve of conjoined specimen. G. PMU In 121, dorsal exterior. H. PMU In 122, dorsal interior. I. PMU In 125, ventral exterior. J. PMU In 123, ventral interior. Scale bars 1 mm.
Fig. 2 in New brachiopods from the Lower-Middle Ordovician (Billingen-Volkhov stages) of the East Baltic
Fig. 2. The standard section in Putilovo Quarry compared with the mud mound section (after Tolmacheva, Fedorov, and Egerquist in press). Levels with occurrences of Neumania paucicostata are marked with squares; levels with Leoniorthis robusta are marked with circles.
Fig. 4 in New brachiopods from the Lower-Middle Ordovician (Billingen-Volkhov stages) of the East Baltic
Fig. 4. Neumania paucicostata sp. nov. Specimens from Putilovo Quarry. A. Holotype PMU In 108; ventral valve interior (A1), enlargement of the spondylium showing the muscle attachment area (A2). B. PMU In 113, oblique internal view of ventral valve showing the U−shaped spondylium. Note that this specimen does not possess rounded muscle scars as in the holotype. C. PMU In 112, enlargement of spondylium on broken ventral valve, slightly oblique view showing theroughmuscleattachmentarea. D.PMUIn109,ventralviewofconjoinedspecimen. E.ExteriorofspecimenPMUIn228indifferentviews. F.PMUIn107, dorsal interior and exterior. G. PMU In 224; oblique posterior view of cardinalia (G1), dorsal valve interior (G2). Scale bars 1 mm.
Fig. 3. Neumania paucicostata. A. Dorsal valve interior showing the anteriorlylobedmusclescars,drawnfromspecimenPMUIn107. B in New brachiopods from the Lower-Middle Ordovician (Billingen-Volkhov stages) of the East Baltic
Fig. 3. Neumania paucicostata. A. Dorsal valve interior showing the anteriorlylobedmusclescars,drawnfromspecimenPMUIn107. B.Lateralview of ventral valve drawn from specimen PMU In 108 (holotype).
Fig.9. A–F in Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan
Fig.9. A–F. Nalivkinia (Pronalivkinia) zvontsovi sp.nov.; A–E, from sample 5190, F, from sample 2523. A. NMW 98.30G.54, holotype, lateral (A1), anterior (A2), ventral (A3), and dorsal (A4) views of conjoined valves, × 3. B. NMW 98.30G.53, lateral (B1), anterior (B2), ventral (B3), and dorsal (B4) views of conjoined valves, × 2.5. C. NMW 98.30G.55, lateral (C1), anterior (C2), dorsal (C3), and ventral (C4) views of conjoined valves, × 2. D. NMW 98.30G.57, lateral view of incomplete shell showing spiralia, × 3.7. E. NMW 98.30G.56, anterior (E1), dorsal (E2), ventral (E3), and lateral (E4) views of conjoined valves, × 1.7. F. NMW 98.30G.58, lateral view of incomplete shell showing spiralia, × 2.25. G. Sulcatospira prima Popov, Nikitin, and Sokiran; sample 5190; NMW 98.30G.49, lateral (G1), anterior (G2), ventral (G3), and dorsal (G4) views of conjoined valves, × 4.
Fig.8 in Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan
Fig.8.Transverse serial sections of conjoined valves and reconstruction of brachial supports of Nalivkinia (Pronalivkinia) zvontsovi sp.nov.Dorsal valve uppermost.
Fig.7 in Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan
Fig.7.Transverse serial sections of conjoined valves of Sulcatospira prima Popov, Nikitin, and Sokiran.Distance in mm is measured from the posterior tip of the ventral beak. Dorsal valve uppermost.
Fig.6 in Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan
Fig.6.Transverse serial sections of conjoined valves of Rhynchotrema seletensis sp.nov.Distance in mm is measured from the posterior tip of the ventral beak. Dorsal valve uppermost.
Fig. 4 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 4. Mickwitzia cf. occidens Walcott. A. Ventral valve MGUH 26296. A1. Interior of juvenile−early mature ventral valve showing tubular openings surrounded by circular depressions, where non−phosphatic material has been dissolved; scale bar 200 µm. A2. Detail of interior of A1, with recrystallized and secondarily enlarged cocci; scale bar 100 µm. B. Exterior of ventral valve MGUH 26297, showing concentric zones of resistant phosphatic material (cocci) around the tubes result in knobs protruding over the surrounding regions; scale bar 500 µm. All specimens from the Bastion Formation (sample GGU 314905).
Fig. 9 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 9. Mickwitzia cf. occidens Walcott. Fragmentary mature valves (indeterminate) MGUH 26311 (A), MGUH 26312 (B), MGUH 26313 (C). A1, A2. Pustulose mature ornamentation with low cone−shaped pustules, perforated by the radiating rows of large tubular openings; scale bar 200 µm. A3. Detail of cone−shaped pustules of A, also showing three large tubular openings; scale bar 50 µm. A4. Detail of pyramidal pustules of A1, showing also scattered large tubular openings; scale bar 50 µm. A5. Detail of large tubular opening of A1. Note lack of depressions around the aperture; scale bar 10 µm. A6. Detail of granular surface structure of A1 and pyramidal pustules; scale bar 50 µm. B. Detail of exfoliated surface of mature valve showing numerous openings to acrotretoid−type columns and single large tubular opening; scale bar 20 µm. C1. Section through re−crystallized primary layer with pyramidal pustules; scale bar 20 µm. C2. Detail of primary layer of C1; scale bar 10 µm. All specimens from the Ella Island Formation, sample GGU 314816.
Fig.5. A–F in Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan
Fig.5. A–F. Rhynchotrema seletensis sp.nov. A, C, F, sample 2523; B, D, E, sample 550a. A. NMW 98.30G.40, ventral (A1), dorsal (A2), anterior (A3), and lateral (A4) views of conjoined valves, × 2.25. B. NMW 98.30G.43, ventral internal mould (B1) and latex cast (B2), × 3. C. NMW 98.30G.41, holotype, ventral (C1), dorsal (C2), lateral (C3), and anterior (C4) views of conjoined valves, × 2.25. D. NMW 98.30G.45, latex cast of dorsal interior, × 2.5. E.NMW 98.30G.42, latex cast of dorsal valve interior (E1) and dorsal internal mould (E2), × 2.25. F. NMW 98.30G.44, anterior (F1), ventral (F2), dorsal (F3), and lateral (F4) views of conjoined valves, × 3. G. Dinorthis taukensis sp. nov.; NMW 98.30G.37, holotype, sample 2523; dorsal (G1), ventral (G2), lateral (G3), anterior (G4), and posterior (G5) views of conjoined valves, × 2.25. H. Glyptomena kaskolica sp. nov.; NMW 98.30G.12, holotype, sample 550a; latex cast of ventral interior showing muscle field, × 2.25.
Fig. 8 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 8. Mickwitzia cf. occidens Walcott. A, B. Ventral valves; MGUH 26305 (A), MGUH 26306 (B). A1. Early mature valve showing beginning pustulose ornamentation; scale bar 500 µm. A2. Detail of pustule of A1; scale bar 20 µm. B1. Mature valve with exfoliated apex showing pustulose ornamentation with offset radiating rows; scale bar 500 µm. B2. Detail of pustulose ornamentation B1; scale bar 200 µm. B3. Oblique lateral view of B1; scale bar 500 µm. C. Dorsal valve MGUH 26307; scale bar 200 µm. All specimens from the Bastion Formation. A, sample GGU 314804; B, sample GGU 314814; C, sample GGU 314905.
Fig. 2. Mickwitzia occidens Walcott. A. Ventral valve MGUH 26294 in The Early Cambrian (Botomian) stem group brachiopod Mickwitzia from Northeast Greenland
Fig. 2. Mickwitzia occidens Walcott. A. Ventral valve MGUH 26294, lateral view of exterior; scale bar 500 µm. B. Ventral valve MGUH 26295, detail of exfoliated exterior with large tube and cocci; scale bar 20 µm. All specimens from the middle member of the Poleta Formation in Indian Springs Canyon, northern Montezuma Range, Esmeralda County, Nevada.
Fig.2 in Late Ordovician brachiopods from the Selety river basin, north Central Kazakhstan
Fig.2.Generalised successions in selected sections of the Tauken Formation showing stratigraphic position of the Kaskol beds and brachiopod sampl es.
Fig. 9 in Frasnian-Famennian extinction and recovery of rhynchonellid brachiopods from the East European Platform
Fig. 9. Transverse serial sections of Ripidiorhynchus livonicus (Buch, 1834) from the early Frasnian of the Main Devonian Field, northwestern Russia. Numbers refer to distances in mm from the top of the ventral umbo. A. CNIGR 1/13076. B. Longitudinal section. CNIGR 2/13076, Chudovo beds, Vybuty rapids, Velikaya River, Pskov region. C. CNIGR 3/13076, Dubnik beds, quarry near town Stary Izborsk, Pechory district.
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