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Acarotrochus

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Journal Article

ACAROTROCHUS LOBULATUS , A NEW GENUS AND SPECIES OF SHALLOW-WATER BENTHIC FORAMINIFER FROM MECHERCHAR JELLYFISH LAKE, PALAU, NW EQUATORIAL PACIFIC OCEAN

Shungo Kawagata, Makoto Yamasaki, Richard W. Jordan
Published: 01 January 2005
Journal of Foraminiferal Research (2005) 35 (1): 44–49.
DOI: https://doi.org/10.2113/35.1.44
...Shungo Kawagata; Makoto Yamasaki; Richard W. Jordan Abstract Acarotrochus lobulatus, a new species of shallow-water calcareous benthic foraminifer, was found in core material from the meromictic Mecherchar Jellyfish Lake of Palau, northwestern equatorial Pacific. The species belongs to a new genus...
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Acarotrochus lobulatus Kawagata, gen. et sp. nov., all scanning electron micrographs, scale bars are all 50 μm unless otherwise stated. 1–3. Adult form, holotype (IGUT13731); 1 spiral view, 2 apertural view, 3 umbilical view. 4–6. Adult form, paratype (IGUT13732); 4 umbilical view, 5 apertural view, 6 spiral view. 7–10. Paratype (IGUT13733); 7 umbilical view, 8 apertural view, 9 spiral view, 10 enlargement of apertural area, showing apertural openings separated by a lobe-like extension from the upper rim of the aperture. 11–13. Juvenile, paratype (IGUT13734); 11 spiral view, 12 apertural view, 13 umbilical view. 14. Enlargement of test surface close to the intraseptal interlocular space showing irregular-shaped, jagged-sutured blocks around the pores which are joined to each other beneath the thin calcite veneer. 15. Paratype (USNM526163), umbilical view. 16. Paratype (USNM526164), umbilical view. 17. Paratype (USNM526165), umbilical view. 18. Paratype (USNM526166), umbilical view.

Acarotrochus lobulatus Kawagata, gen. et sp. nov., all scanning electron m...

Published: 01 January 2005
PLATE 1 Acarotrochus lobulatus Kawagata, gen. et sp. nov., all scanning electron micrographs, scale bars are all 50 μm unless otherwise stated. 1–3. Adult form, holotype (IGUT13731); 1 spiral view, 2 apertural view, 3 umbilical view. 4–6. Adult form, paratype (IGUT13732); 4
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Abbreviations used for morphological terms follow Hottinger and others (1993). All scanning electron micrographs, scale bars are 10 μm (Figs. 1–7, 11, 12), and 50 μm (Figs. 8–10). 1–7.Acarotrochus lobulatus Kawagata, gen. et sp. nov., from 75–76 cm downcore; 1–2 Oblique view of dissected specimen (umbilical side) showing key features of external and internal structures. Note lobe-like perforate folium (fo), deeply sunken intraseptal interlocular space (is), as well as septal foramen (f) and foliar aperture (foa). 3 Enlargement of apertural view of Fig. 1 showing that the foramenal plate is an extension of the septal flap (sf) which is adhering to the septal face. 4–5 Enlargement of apertural view of dissected specimen showing that the broad foramenal plate (fp) never diverges from the foliar chamber wall, and is formed along the umbilical margin of the septal foramen and attaches to the preceding whorl. Note that the foramenal plate divides the foliar chamberlet lumen (foc) from the main chamber lumen. 6–7 Side views of a dissected specimen showing inside of the penultimate chamber. Note that an intraseptal interlocular space is formed between the septal flap (sf) and the preceding septal face. 8–12.Helenina cf. H. anderseni (Warren, 1957), from 77–78 cm downcore; 8 spiral view, 9 umbilical, 10 apertural. 11 Enlargement of apertural view of a dissected specimen showing that the foramenal plate (fp), a continuation of the septal flap (sf), extends across the chamber lumen and divides it from the foliar chamberlet lumen. Note that the foramenal plate (fp) shows a tunnel-like structure in part, where the supplementary aperture (sa) communicates with the interiomarginal aperture (a). 12 Oblique umbilical view of the dissected specimen of Fig. 11 showing a folded foramenal plate (fp) connecting between the interiomarginal aperture (a) and the foliar aperture (foa), as well as the supplementary aperture (sa).

Abbreviations used for morphological terms follow Hottinger and others (19...

Published: 01 January 2005
PLATE 2 Abbreviations used for morphological terms follow Hottinger and others (1993) . All scanning electron micrographs, scale bars are 10 μm (Figs. 1–7, 11, 12), and 50 μm (Figs. 8–10). 1–7. Acarotrochus lobulatus Kawagata, gen. et sp. nov., from 75–76 cm downcore; 1–2 Oblique view
Journal Article

FAUNAL EVIDENCE OF A HOLOCENE PLUVIAL PHASE IN SOUTHERN ARABIA WITH REMARKS ON THE MORPHOLOGICAL VARIABILITY OF HELENINA ANDERSENI

Giordana Gennari, Thomas Rosenberg, Silvia Spezzaferri, Jean-Pierre Berger, Dominik Fleitmann, Frank Preusser, Mahmoud Al-Shanti, Albert Matter
Published: 01 July 2011
Journal of Foraminiferal Research (2011) 41 (3): 248–259.
DOI: https://doi.org/10.2113/gsjfr.41.3.248
... the Fraser River delta, British Columbia : Micropaleontology , v. 38 , p. 289 – 301 . Kawagata , S. , Yamasaki , M. , and Jordan , R. W. , 2005a , Acarotrochus lobulatus , a new genus and species of shallow-water benthic foraminifera from Mecherchar Jellyfish Lake, Palau, NW...
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View PDF for article title, FAUNAL EVIDENCE OF A HOLOCENE PLUVIAL PHASE IN SOUTHERN ARABIA WITH REMARKS ON THE MORPHOLOGICAL VARIABILITY OF HELENINA ANDERSENI
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