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1,015 results for “Ostracods”
Fig. 21 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 21. Detailed views of carapaces of Bennelongia dedeckkeri Shearn et al., 2012 from Lake Dunn to show the domes in both images and 4 cones in the top image of an A-3 specimen, and only one cone in the image of an A-4 specimen. Note the interlacing reticulation around the domes, and the small nodes coating the valves, with 2 different diameters best seen to the right of the largest dome. These nodules are thought to be part of the valve ornamentation.
Fig. 18 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 18. Specimens of Bennelongia cf. barangaroo nov. sp. from McNeil Claypan, to show specific features of juvenile specimens. Top left image shows the poorly pronounced domes in the dorsal region of the LV of an A-3 specimen. Top right image shows an internal view of an A-3 that shows the less pronounced inner list and the depression located opposite the cones and the possible larger depression matching the external dome. The middle images show the cones with the lips near their apex. Bottom left image shows the larger pores on the inside of the valve, that are connected to the opening of each pore on the apex of each cone. Bottom right corner image shows the highly reticulated texture of an A-3 valve and the domes that are not as pronounced as in other Bennelongia species (e.g., compare to B. nimala nov. sp. in Fig. 3).
Fig. 14 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 14. Bennelongia kimberleyensis Martens et al., 2012 from Taylor's Lagoon. Lateral views of carapaces of different moult stages going from adult to A-3 specimens, plus a lateral view of a single LV of an A-4 specimen (bottom image) that is partly broken along its anterior margin. Top left image represents an adult showing the asymmetric valves, with the antero-ventral beak-like expansion of the LV that is the characteristic of most Bennelongia species in the adult stage. Right lateral views are in the left column, left lateral views are in right column. Note that the pseudo-punctation is more pronounced in the youngest stages compared to the almost smooth nature of the adult valve.
Fig. 19 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 19. Dorsal views of carapaces of Bennelongia dedeckkeri Shearn et al., 2012 from Lake Dunn (Queensland) for the last 4 instars (A-4 to A-1) and the adult to show the changes in external ornamentation and the progressive disappearance of the domes and cones with ontogeny, such that at the adult stage, there is no ornamentation. Observe the presence of outer lists in all juvenile specimens clearly visible in the antero-dorsal region.
Fig. 16 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 16. Lateral views of carapaces of Bennelongia cf. barangaroo nov. sp. from McNeil Claypan. Left column displays carapace in right lateral view, right column shows carapaces in left lateral view. Note the pronounced asymmetry between the adult valves and the less-pronounced beak-like feature of the anteroventral region of the adult LV. Pseudo-punctation is more pronounced in the younger instars and the domes and cones are only clearly visible in A-3 specimens, although remnants remain in the last two juvenile stages.
Fig. 17 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 17. Dorsal views of carapaces of Bennelongia cf. barangaroo nov. sp. from McNeil Claypan. Observe the coarse reticulation in A-3 specimens and the pseudo-punctuation that becomes less visible with progressing ontogeny. The adult specimen in top left image displays some agglomeration of glue along the hinge, particularly in the anterior and posterior regions.
Fig. 13 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 13. Bennelongia kimberleyensis Martens et al., 2012 from Taylor's Lagoon. Dorsal views of carapaces of different moult stages going from adult to A-4. Note the highly ornamented A-4 carapace with at least 2 sets of domes (and prominent cones) that are still visible in A-3, and not visible in the other stages. Only a few cones are seen in the A-1 specimen, and no ornamentation is visible in the adult specimen.
Fig. 8 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 8. External views of carapaces of Bennelongia cf. nimala nov. sp. juveniles from Muggon Lake, showing left valves in order to compare the ornamentation between an A-2 specimen (top) and A-3 specimen (bottom). The circles, ellipses and polygons are used to define the ornamentations that are common to both specimens. The arrows indicate a clear depression, postero-dorsally to each dome, that are linked by a white line.
Fig. 6 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 6. Details of external views of carapaces of Bennelongia cf. nimala nov. sp. juveniles from Muggon Lake. Top left. anterior margin of A-2 carapace in left lateral view, showing the arrangement of the radial pores and their setae. Top right. enlargement of the cone of A-3 valve, showing the fine seta near its top. Bottom left. ventral view of the two valves, showing the radial pores and setae as well as the very fine and narrow external flange in both valves, but more pronounced in the RV seen on the left here. Note also that claws of some limbs are protruding from the closed valves. Bottom right. enlargement of cone and associated lip and protruding seta of an A-3 specimen. Note the presence of fine particulate material stuck to the valve.
Fig. 5 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 5. Details of external lateral views of carapaces of Bennelongia cf. nimala nov. sp. juveniles from Muggon Lake. Top left. A-1 showing the dome and many of the cones with outer lips. Note the large pseudo-pores that are elongated over what appears to be a second protuberance. Top right. A-2 showing the cones with the outer lips at their apex. Many of the pores yield a seta. Bottom. RV of A-2 in dorsal view, showing the assemblage of cones with outer lips and the dome, on top of which a seta occurs. Note the hinge at the bottom.
Fig. 7 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 7. External views of carapaces of Bennelongia cf. nimala nov. sp. juveniles from Muggon Lake, showing left valves in order to compare the ornamentation between an A-1 specimen (top) and A-2 specimen (bottom). The arrows indicate a clear depression postero-dorsally to each dome, that are linked by a white line.
Fig. 4 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 4. Lateral external views of carapaces of A-1 juveniles of Bennelongia cf. nimala nov. sp. from Muggon Lake. Top in left lateral view and bottom in right lateral view.
Fig. 2 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 2. External lateral views of Bennelongia cf. nimala nov. sp. from Muggon Lake. Top. adult carapace in right lateral view. Note the pronounced asymmetry of the valves, especially in the anterior region. Middle. LV of A-1 and A-2 specimens. Bottom. LV of A-3 specimen and RV of A-4 specimen. Domes are arrowed.
Fig. 1 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 1. SEM photographs showing detailed internal views of the anterior portion of the right valves to highlight key features. Top: Adult Right valve (=RV) of Bennelongia gwelupensis Martens et al., 2012 from Lake Gwelup, that clearly displays the lapel, characteristic of right valves of Bennelongia adults, which is seen as an extension of the old valve margin. The selvage in this species is very well pronounced. Bottom: Last instar (=A-1, standing for adult-1 stage) of Bennelongia gwelupensis Martens et al., 2012 from Katanning Road pool. Note the prominent inner list that is rarely seen in A-1 specimens in species of Cyprididae, except in Bennelongia species, and the well calcified selvage replacing the valve margin.
Fig. 3 in Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)
Fig. 3. External dorsal views of juvenile carapaces (A-1 to A-4) of Bennelongia cf. nimala nov. sp. from Muggon Lake. Domes are arrowed.
Figure 3 in A Pulsing-Mirror Eye in a Deep-Sea Ostracod
Figure 3. Ray tracing of light imaged on the Gigantocypris sp. retina: (A–B) when the luminous object is distant, the oscillations of the parabolic reflector cause the object to go in and out of focus at the retina, as the reflector is relaxed and then "flattened"; (C–D) when the luminous object is nearby, the oscillations of the parabolic reflector cause little change to the image focused on the retina.
Figure 2. Frame from a in A Pulsing-Mirror Eye in a Deep-Sea Ostracod
Figure 2. Frame from a magnified video recording of a resting Gigantocypris sp. showing paired eyes only, anterior view. The mirrors appear silver; the layer of black, absorbing pigment beneath is not visible. A white-yellow light is back-reflected.
Figure 6 in A minute ostracod (Crustacea: Cytheromatidae) from the Miocene Solim oes Formation (western Amazonia, Brazil): evidence for marine incursions?
Figure 6. Tentative middle Miocene palaeogeography of the Caribbean realm and South America (based on Iturralde-Vinent & MacPhee 1999; Del Ŕıo 2000; Herńandez et al. 2005; Hoorn et al. 2010b; Candela et al. 2012; extent of the Paranaense Sea probably too large (dashed blue line); compare Acenolaza 2000; Cione et al. 2011; Ruskin et al. 2011) and Miocene records of Pellucistoma (the late Miocene P. magniventra (Florida) and P. aff. spurium (Bahamas) records are not displayed; compare Fig. 5).
Figure 4. d18O and d13C in A minute ostracod (Crustacea: Cytheromatidae) from the Miocene Solim oes Formation (western Amazonia, Brazil): evidence for marine incursions?
Figure 4. d18O and d13C isotopic ratios of Cyprideis species associated with Pellucistoma curupira sp. nov. Abbreviation: no.s., number of shells used for analysis. Grey shaded polygons display the range of results obtained from fossil and Recent ostracods from the Eiruneṕe region (Gross et al. 2013). (Note: the indicated range for modern rivers and floodplain lakes is based on aragonitic mollusc shells (Wesselingh et al. 2006), which give somewhat heavier values for the same environmental parameters compared to ostracod calcite (Grossman & Ku 1986)).
Figure 5 in A minute ostracod (Crustacea: Cytheromatidae) from the Miocene Solim oes Formation (western Amazonia, Brazil): evidence for marine incursions?
Figure 5. Fossil and Recent records of Pellucistoma species (mean annual sea surface temperature (SST) based on NASA data (http:// svs.gsfc.nasa.gov/index.html; accessed 18 September 2014); for details see Supplemental Material 1 and 2; species only known from the fossil record marked with †.
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Allen Brain Atlas
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