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533 results for “Cephalopoda”
Figure 5 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family
Figure 5. Three similarly sized shells of varied appearance selected from the examined SBMNH lot: a–c, three similarly sized shells of varied appearance selected from the single lot collected at El Mogote, La Paz, Baja California Sur, Mexico (24° 10' 00" N, 110° 24' 00" W) on 15 January 2000; a, shell #74 (65.0 mm shell length, SBMNH 345766) assigned the name cornutus-type voucher; b, shell #42 (61.2 mm shell length, SBMNH 345766) assigned the name intermediate voucher; c, shell #109 (66.5 mm shell length, SBMNH 345768) assigned the name nouryi-type voucher; i–iv, multiple perspectives of each shell; i, left lateral view; ii, anterior aperture view; iii, posterior keel view; iv, ventral view. Scale bar = 1 cm.
Figure 4 in Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family
Figure 4. Comparison of a shell from the examined SBMNH lot with the type specimen and illustrations taken from the original description of Argonauta cornutus Conrad, 1854: a, reproduced illustration taken from the original description of A. cornutus Conrad, 1854, plate 34, fig. 2; b, photographs of the type specimen illustrated in the original description (58.6 mm shell length, ANSP 63496; please note, the original description illustrations mirror the characters of the shell, most likely due to the engraving and printing process of the era); c, illustrations of a shell matching the description of A. cornutus taken from the examined lot (shell #74, 65.0 mm shell length, SBMNH 345766). Illustration: R. Plant. Scale bar = 1 cm.
Figure 1. Argonauta hians Lightfoot, 1786 in Short Communication Argonauta hians Lightfoot, 1786 (Cephalopoda: Argonautidae): A new record to the northern east coast of India
Figure 1. Argonauta hians Lightfoot, 1786: A. female in shell; B. Body of female; C – D. Lateral view of shell (both side); E. apertural view; F. abapertural view.
FIGURE 15 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 15. Two-dimensional plot Lsn (standardised length form apex to the protoconch) vs. AV (ventral aspect) of guards of Bln. kazimiroviensis from central and southern Russia and Central Asia, as illustrated by Naidin (1975). The dashed lines indicate the variability of Bln. kazimiroviensis and Bln. skolozdrownae from the Maastricht and the Middle Vistula valley regions.
FIGURE 20 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 20. Relationship of BI (Birkelund Index) vs Dp (dorso ventral diameter at the protoconch) (BI = Ls/Dp; compare with Figure 6) of guards of Bln. skolozdrownae from the Middle Vistula valley in Poland and the Maastricht area in the Dutch-Belgian border region, in addition to two specimens from Denmark (blank triangles) as illustrated in the scientific literature (Jeletzky, 1951, pl. 7, figure 1; Birkelund, 1957, pl. 6, figure 4).
FIGURE 17 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 17. Belemnella (Neobelemnella) kazimiroviensis (Skołozdrówna, 1932). 1-4, NHMM JJ 4048/1, former Curfs-Ankerpoort quarry; basal Geulhem Member, Vroenhoven Horizon, + 0.00-0.05 m; 5-8, NHMM JJ 8339, former Blom quarry, Meerssen Member IVf-4; 9-12, NHMM MK 2516, Geulhemmerberg subterranean galleries near Geulhem, top of Meerssen Member (IVf-6); 13-16, MWGUW ZI/69/44, 17-20, ZI/69/47 and 21-24, ZI/69/51, respectively, from the "phosphatic layer" at Nasiłów quarry. All specimens are in natural size in following views: dorsal (1, 5, 9, 13, 17, 21), lateral (2, 6, 10, 14, 18, 22), longitudinally split specimen showing internal features (3, 7, 11, 15, 19, 23), and close-up of alveolar part [x2] with the course of the bottom of ventral fissure – dashed line (4, 8, 12, 16, 20, 24).
FIGURE 14 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 14. Two-dimensional plot Lsn (standardised length form apex to the protoconch) vs. AV (ventral aspect) of guards of Bln. kazimiroviensis and Bln. skolozdrownae from deposits in the Maastricht area (the Netherlands, Belgium). The dashed lines indicate the variability of Bln. kazimiroviensis and Bln. skolozdrownae from the Middle Vistula valley region (Poland).
FIGURE 8 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 8. Relative distribution of size groups of Bln. gr. kazimiroviensis from the Maastricht area – Geulhemmerberg underground section above the Berg en Terblijt Horizon (the Netherlands) and Albert Canal sections above the Vroenhoven Horizon (Belgium).
FIGURE 7 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 7. Relative distribution of size groups of Bln. gr. kazimiroviensis from the glauconitic sandstone and basal Siwak at Nasiłów (Poland).
FIGURE 9 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 9. Relationship of BI (Birkelund Index) vs Dp (dorso-ventral diameter at the protoconch) (BI = Ls/Dp; compare with Figure 6) of all guards of the kazimiroviensis group from the Middle Vistula River valley, the Maastricht area, Denmark, central and southern Russia and Central Asia, inclusive of data of early ontogenetic stages measured on longitudinally split specimens. The growth relationship is best described by a logarithmic curve, indicating that small (young) specimens are relatively more slender than larger (adult) ones.
FIGURE 11 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 11. Two-dimensional plot for PC 1 and PC 2 derived from the PCA of belemnites of the kazimiroviensis group of the Kazimierz Opoka (Opoka) and the glauconitic sandstone (Greensand) of the Middle Vistula valley, as well as of those from the Maastricht area (the Netherlands, Belgium) (Meerssen).
FIGURE 10 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 10. Two-dimensional plot Lsn (standardised length form apex to the protoconch) vs. AV (ventral aspect) of guards of Bln. kazimiroviensis and Bln. skolozdrownae from the Kazimierz Opoka (Kongiel Collection) from different localities (Kazimierz, Bochotnica and Nasilów), all except one from levels x and y sensu Pożaryski (1938).
FIGURE 12 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 12. Two-dimensional plot Lsn (standardised length form apex to the protoconch) vs. AV (ventral aspect) of guards of Bln. kazimiroviensis and Bln. skolozdrownae from the glauconitic sandstone at Nasilów quarry. The dashed line indicates the variability of both species in the stratigraphically older Kazimierz Opoka.
FIGURE 6 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 6. Diagram illustrating morphological features of the belemnite guard (lateral view of a longitudinally split guard on the left, ventral view on the right). AA = alveolar angle; FA = fissure angle; SD = Schatzky distance; Ls = length from apex to protoconch; Ds, Dp, Dc = dorso-ventral diameters at different part of the rostrum; Bs, Bp, Bc = lateral diameters at different part of the rostrum (after Keutgen, 1997; Keutgen et al., 2012).
FIGURE 5 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 5. Age, lithostratigraphy, general lithology and subdivision into lithostratigraphical horizons and units (IVe-1 to Va-4) of the section formerly exposed at the Curfs-Ankerpoort quarry (Geulhem), with indication (arrow) of the KPg boundary, equating with the Berg en Terblijt Horizon at the top of subunit IVf-6 (modified after Jagt and JagtYazykova, 2012). The range of belemnite species shown is that for the entire Maastricht area. R = remanié specimens.
FIGURE 3. 1, Generalised K in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 3. 1, Generalised K-Pg section at Nasiłów; 2, Details of the boundary interval and the position of the K-Pg boundary placed at the top of the Kazimierz Opoka; according to Machalski (1998).
FIGURE 4. 1 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 4. 1, Schematic map of southern Limburg (the Netherlands) showing the formerly available outcrops of the Meerssen Member (red stars) (after Jagt et al., 1996) that yielded representatives of the Belemnella kazimiroviensis group; black dots are smaller towns in the area; 2, Position of the Netherlands within Europe (red star).
FIGURE 13 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 13. Two-dimensional plot Lsn (standardised length form apex to the protoconch) vs. AV (ventral aspect) of guards of Bln. kazimiroviensis from the basal Siwak at Nasilów quarry. The dashed lines indicate the variability of Bln. kazimiroviensis and Bln. skolozdrownae from the stratigraphically older glauconitic sandstone.
FIGURE 1 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 1. Map of Europe and Central Asia, illustrating the general distribution of representatives of the Belemnella kazimiroviensis group as a whole, without differentiation into particular species of the group. The origin of holotype specimens of representatives of this group recorded in the literature are as follows: Belemnella kazimiroviensis – Vistula section; Belemnella skolozdrownae – Stevns Klint; Belemnella pensaensis – Saratov/Penza; Belemnella arkhangelskii – Turgay Plateau.
FIGURE 16 in The late Maastrichtian Belemnella kazimiroviensis group (Cephalopoda, Coleoidea) in the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium) - taxonomy and palaeobiological implications
FIGURE 16. Two-dimensional plot Lsn (standardised length form apex to the protoconch) vs. AV (ventral aspect) of guards of Bln. kazimiroviensis and Bln. skolozdrownae from Denmark mentioned in the scientific literature. The holotypes of Bln. kazimiroviensis, proposed by Jeletzky (1951) and Kongiel (1962), are also indicated (blank squares), in addition to the holotype of Bln. skolozdrownae from Denmark. The dashed lines indicate the variability of Bln. kazimiroviensis and Bln. skolozdrownae from the Middle Vistula valley (Poland) and the Maastricht area (the Netherlands, Belgium).
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