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367 results for “crinoid”
Fig. 4 in Crinoid and ostracod succession within the Early-Middle Frasnian interval in the Wietrznia quarry, Holy Cross Mountains, Poland
Fig. 4. Stratigraphic distribution of the Early Frasnian ostracod species in the Wietrznia Id−W section, Holy Cross Mountains. Lithology, stratigraphy and stable carbon isotope geochemistry modified from Pisarzowska et al. (2006). Abbreviations: LWB, lower Wietrznia Beds; SML, Śluchowice Marly Level.
Fig. 3 in Crinoid and ostracod succession within the Early-Middle Frasnian interval in the Wietrznia quarry, Holy Cross Mountains, Poland
Fig. 3. Early–Middle Frasnian crinoids from the Wietrznia Ie section, Holy Cross Mountains. A, B. Platycrinites sp. A. GIUS−4−404/2, sample Ie−66, articular facet with very weakly developed fulcrum. B. GIUS−4−404/3, sample Ie−66, articular facet with marginal culmina. C, D. Haplocrinites sp. C. GIUS−4−404/5, sample Ie−48, theca from A−ray side. D. GIUS−4−404/6, sample Ie−48, theca from E−ray side. E. Cupressocrinites sp., GIUS−4−404/8, sample Ie−19. F. Floricrinus sp., GIUS−4−404/6, sample Ie−66. G. Anthinocrinus wenjukowi Yeltyschewa in Yeltyschewa and Stukalina, 1977, GIUS−4−404/15, sample Ie−34. H. Marettocrinus kartzevae (Yeltyschewa and Dubatolova in Dubatolova and Yeltyschewa, 1961), GIUS−4−404/10, sample Ie−19. I. Laudonomphalus humilicarinatus (Yeltyschewa in Dubatolova and Yeltyschewa, 1961), GIUS−4−404/7, sample Ie−19. J. Kstutocrinus sp., GIUS−4−404//13, sample Ie−66. K. Schyschcatocrinus multiformis Głuchowski, 1993, GIUS−4−404/16, sample Ie−19. L. Schyschcatocrinus delicatus Głuchowski, 1993, GIUS−4−404/14, +
Figure 20 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 20. Modifications in the profile of the levels of organization of the columnals along the stalk during ontogeny. (a) Guillecrinus neocaledonicus; (b) comparison of adult stages of the two species of Guillecrinus. A, Adult stage (A1 and A2: see Figure 17); J, juvenile stage; Prox. 1, new columnals appearing proximally (proximal vertical axis on Figure 17).
Figure 18 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 18. Reconstruction of the growth curves in Guillecrinus, from specimens retaining the proximal part of the stalk. (a) Ontogenic index (kH) provided by the most proximal segment of the simplified biometric profiles of the heights of the columnals (see Figure 16); (b) ontogenic growth curves using the proximal diameter of the stalk as an index of the size and kH as an index of relative age. AC, aboral cup. See text for explanations.
Figure 17 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 17. Ontogeny of the columnals in relation to their place within the stalk in Guillecrinus. Horizontal row of columnals represents a succession of columnals along individual stalks; lines connecting columnals of adjacent rows represent a succession of ontogenetic stages with a growth in size. For the axial sections below and to the right each columnal cross-section, the black areas schematize the place and the amplitude of the ligamentary depressions. J, juvenile stage; A, adult stage; J2 and A2, observed stages; J1 and A1, earlier stages deduced from observations on J2 and A2; solid lines, ontogenetic trends of G. neocaledonicus; dotted lines, hypothetical relationships with G. reunionensis; r, rigid; f, flexible; a, ankylosis. See text for explanations.
Figure 16 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 16. Simplified schemes of the principal modifications in the biometric profiles of Guillecrinus stalks during ontogeny. Hm, minimal proximal height; Dc, diameter of the base of the aboral cup; DM, maximum proximal diameter; Dm, minimal proximal diameter; dotted area, proxistele; open area, mesistele; short scattered lines, dististele.
Figure 15 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 15. Distribution of the types of articular facets along the adult stalk of Guillecrinus. (A) Ontogenetic distal process (subsidiary crests); (B) proximal ontogenetic process (only interareolar ridges).
Figure 13 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 13. Biometric profiles of the stalk of three specimens of Guillecrinus reunionensis. (m) Fixation disk.
Figure 12 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 12. Proximal and median columnals of Guillecrinus reunionensis. (a) Proximal facet of holotype. (b–f) paratype: (b) columnal under the basal circlet, not visible externally; (c) first visible columnal, proximal facet; (d) the same, distal facet; (e) 62nd columnal, proximal facet; (f) 63rd columnal, proximal facet. ra, radials; ba, basals; col, first columnal; s, suture visible externally. Scale bars: 1 mm.
Figure 9 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 9. Proximal and median columnals of the adult specimens of Guillecrinus neocaledonicus. (a–d) Proximal columnals of the N6 specimen: (a) most proximal columnal, distal facet; (b) same columnal, proximal facet; (c) second columnal, proximal facet; (d) third columnal; (e) one of the proximal columnals of the N7 specimen; (f) most frequent type of columnal in the N7 specimen. Scale bars: 1 mm.
Figure 8 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 8. Biometric profiles of the stalk of the specimens of Guillecrinus neocaledonicus which do not belong to the type series. (m) Fixation disk.
Figure 6 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 6. Columnals of the mesistele and dististele of juvenile specimen N3. (a) Columnal 5b; (b, c) columnal 5c; (d) columnal 4; (e) columnal 39; (f) columnal 2 (see their place on the biometric profile on Figure 3). Scale bars: 0.2 mm.
Figure 5 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 5. Columnals of the stalk from the juvenile specimen N5, from the most proximal (a) to the distal extremity of the stalk (f). Scale bars: 0.5 mm.
Figure 7 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 7. Modifications in the biometric profile of columnal height during stalk ontogeny in Guillecrinus neocaledonicus. Specimens of the type series.
Figure 10 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 10. Distal columnals of the adult specimens of Guillecrinus neocaledonicus. (a–f) Increasingly distal columnals with an increasingly early development of subsidiary crests: (a–d) facets with a pentaradiate symmetry; (e) facet with a four-part symmetry inherited from a juvenile stage similar to that of Figure 5d; (f) facet with bilateral symmetry and with two generations of subsidiary crests, inherited from a juvenile stage similar to that of Figure 5f, note the growth in diameter of the axial canal resulting from resorption of the perilumen stereom of the initial fulcral ridge. Scale bars: 1 mm.
Figure 4 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 4. Biometric profiles of the stalk of the juvenile specimens of Guillecrinus neocaledonicus. The numbers in circles refer to the symmetry of the articulations (for 5b, 5c, 39 see Figure 6). Dotted area with the single line defines transitional zone of mesistele; double vertical lines define the entire mesistele.
Figure 19 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 19. Variations in the level of organization of the columnals during their ontogeny in relation to their position on the stalk at the juvenile stage in Guillecrinus neocaledonicus. Ontogenetic stages of Figure 16 (J1 and J2, juvenile stage; A1 and A2, adult stage). Position on the stalk at the juvenile stage (P, proxistele; M, mesistele; D, dististele). See text for explanations.
Figure 2 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 2. Developmental stages of the stalk in the genus Guillecrinus. The shaded portion represents columnals that appear earliest during development.
Figure 3 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 3. Morphological units versus functional units, and symmetries at two levels of integration (ossicle and stalk). (a) A columnal viewed along its proximal/distal axis; (b) symmetry produced by superimposing the proximal and distal fulcral ridges of the columnal in (a); (c) superposition of articular fulcra of all columnals along the stalk; (d) schematic diagram of morphological and functional stalk units and their interactions.
Figure 1 in Environmental control versus phylogenic fingerprint in ontogeny: The example of the development of the stalk in the genus Guillecrinus (stalked crinoids, Echinodermata)
Figure 1. External morphology of the proximal part of the arms of the stalk. (a–d) Guillecrinus neocaledonicus: (a) specimen N1, holotype; (b) specimen N2; (c, d) specimen N3, juvenile. (e–h) G. reunionensis: (e, f) specimen R2; (g, h) specimen R1, holotype. ba, basals; ib?, pseudo-infrabasals. Scale bars: 1 mm (a, b, e, g, h); 0.5 mm (c, f); 0.2 mm (d).
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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International Brain Laboratory public data
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OpenNeuro
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