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24 results for “Globigerinoidesella”
Figure 11. Trilobatus sacculifer with incipient protuberances and intergradation with Globigerinoidesella fistulosa. A–J in Systematic taxonomy of the Trilobatus sacculifer plexus and descendant Globigerinoidesella fistulosa (planktonic foraminifera)
Figure 11. Trilobatus sacculifer with incipient protuberances and intergradation with Globigerinoidesella fistulosa. A–J, Trilobatus sacculifer (Brady, 1877); K–P, Globigerinoidesella fistulosa (Schubert, 1910). A–J, ODP Site 1115, Woodlark Basin, western Pacific; 10H/04/127–129 cm (A, D, J, umbilical view, in A note kummerform final sac-like chamber; B, C, H, I, spiral view, in B note kummerform final sac-like chamber); E–G, ODP Site 1115, Woodlark Basin, western Pacific; 11H/04/25–27 cm (E, umbilical view; F, G, spiral view). K, L, O, P, ODP Site 1115, Woodlark Basin, western Pacific; 10H/04/127–129 cm (K, spiral view; L, umbilical view; note multiple small protuberances and broad flattened final chamber; O, P, umbilical view); M, N, ODP Site 1115, Woodlark Basin, western Pacific; 11H/04/25–27 cm (umbilical view). Scale bars = 100 Lm.
Figure 17 in Systematic taxonomy of the Trilobatus sacculifer plexus and descendant Globigerinoidesella fistulosa (planktonic foraminifera)
Figure 17. Trilobatus sacculifer plexus, showing type specimens (A–D), morphological intergradation sequence and morphospecies exemplars (E–H). A, E, Trilobatus trilobus (Reuss, 1850); B, F, Trilobatus immaturus (LeRoy, 1939); C, G, Trilobatus quadrilobatus (d'Orbigny, 1846); D, H, Trilobatus sacculifer (Brady, 1877). A, salt mine Wieliczka, near Krakow, Poland (umbilical view; neotype image reproduced from Rogl 2012, pl. 1, fig. 1). B, Telisa Shales, Tapoeng Kiri area, Rokan-Tapanoeli, Central Sumatra, Indonesia (umbilical view; holotype image reproduced from LeRoy 1939, pl. 3, fig. 19). C, Nussdorf (= Nubdorf), Rara, Vienna Basin, Austria (umbilical view; lectotype image reproduced from Papp & Schmid 1985, pl. 3, fig. 19). D, New Ireland, Papua New Guinea (umbilical view; lectotype of Banner & Blow 1960, image reproduced from Williams et al. 2006, pl. 1, fig. 1). E, GLOW-3, south-west Indian Ocean (umbilical view). F, ODP Site 871, Limalok Guyot, Marshall Islands, equatorial Pacific 3H/ 03/60–62 cm (umbilical view). G, ODP Site 871, Limalok Guyot, Marshall Islands, equatorial Pacific 3H/03/60–62 cm (umbilical view). H, ODP Site 1115, Woodlark Basin, western Pacific; 11H/04/25–27 cm (umbilical view). Scale bars = 100 Lm.
Size and shape data of Globigerinoidesella fistulosa, Trilobatus sacculifer and intermediate specimens from ODP Site 1115
<p><span>Planktonic foraminifera are extremely well-suited to study evolutionary processes in the fossil record due to their high-resolution deposits and global distribution. Species are typically conservative in their shell morphology with the same geometric shapes appearing repeatedly through iterative evolution, but the mechanisms behind the architectural limits on foraminiferal shell shape are still not well understood. To understand when and how these developmental constraints can be overcome, we study morphological change leading up to the origination of the unusually ornate species <em>Globigerinoidesella</em> <em>fistulosa</em>. Our results show that the origination of<em> G. fistulosa</em> from the <em>Trilobatus sacculifer </em>plexus involved an amalgamation of three different heterochronic expressions: addition of chambers (hypermorphosis), earlier onset of protuberances (pre-displacement), and steeper allometric slope (acceleration) as compared to its ancestor. We argue that the protuberances unique to <em>G. fistulosa</em> were necessary to sustain a surface-area: volume ratio that could host sufficient numbers of photosymbionts. Our work provides a case study of the complex combination of processes required to produce unusual shell shapes and highlights the importance of developmental processes in evolutionary origination. </span></p>
Size and shape data of Globigerinoidesella fistulosa, Trilobatus sacculifer and intermediate specimens from ODP Site 1115
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