Foraminifera taxon details

Acarotrochus Kawagata, 2005

Acarotrochus lobatulus Holotype, Palau
Acarotrochus lobatulus Holotype, Palau

545293 (urn:lsid:marinespecies.org:taxname:545293)

  1. Biota
  2. Chromista (Kingdom)
  3. Harosa (Subkingdom)
  4. Rhizaria (Infrakingdom)
  5. Foraminifera (Phylum)
  6. Globothalamea (Class)
  7. Rotaliana (Subclass)
  8. Rotaliida (Order)
  9. Rotalioidea (Superfamily)
  10. Ammoniidae (Family)
  11. Acarotrochus (Genus)
accepted
Genus
Acarotrochus lobulatus Kawagata, 2005 (type by original designation)

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marine, brackish, fresh, terrestrial
Kawagata, S. (2005). Acarotrochus lobulatus, a new genus and species of shallow-water benthic foraminifer from Mecherchar Jellyfish Lake, Palau, NW equatorial Pacific Ocean. <em>The Journal of Foraminiferal Research.</em> 35(1): 44-49., available online at https://doi.org/10.2113/35.1.44
note: See also: Kawagata S., Yamasaki M., Genka R. & Jordan R.W. 2005. Shallow-water benthic foraminifers from Mecherchar Jellyfish Lake (Ongerul Tketau Uet), Palau. Micronesica 37(2): 215-233 [records subf...    
See also: Kawagata S., Yamasaki M., Genka R. & Jordan R.W. 2005. Shallow-water benthic foraminifers from Mecherchar Jellyfish Lake (Ongerul Tketau Uet), Palau. Micronesica 37(2): 215-233 [records subfossil Acarotrochus lobulatus]
[details] Available for editors  PDF available [request]
Original description Diagnosis. Test free, very low trochospiral, evolute on the spiral side, involute on the umbilical side, peripheral outline...  
Original description Diagnosis. Test free, very low trochospiral, evolute on the spiral side, involute on the umbilical side, peripheral outline lobulate in adult, peripheral margin broadly rounded; chambers slightly inflated on both sides, large lobe-like perforate folia of successive chambers on the umbilical side fusing to previous folia and foliar chambers; sutures radial, slightly depressed on spiral side and deeply incised nearly halfway from the periphery on umbilical side; wall calcareous, thin, perforate over entire test; aperture an interiomarginal, and umbilical slit opening beneath the folium, separated by a lobe issuing from the upper rim of the aperture; each folium turning backwards and in a peripheral direction, and attached to the preceding chamber, covering part of the deep intraseptal interlocular space and producing a suprasutural foliar aperture at the peripheral end of the folium; foramenal plate thin, broad and imperforate, an extension of a septal flap, attached to the adjacent previous whorl, cutting off the foliar chamberlet lumen from the main chamber lumen.
Holocene, possibly at the end of the Little Ice Age. Palau. [details]
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2025). World Foraminifera Database. Acarotrochus Kawagata, 2005. Accessed at: https://www.marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=545293 on 2026-10-03
Date
action
by
2010-11-13 05:39:03Z
created
Hayward, Bruce W.
2014-05-11 05:28:50Z
changed
Hayward, Bruce W.
2021-05-03 09:50:35Z
changed
Hayward, Bruce W.

original description Kawagata, S. (2005). Acarotrochus lobulatus, a new genus and species of shallow-water benthic foraminifer from Mecherchar Jellyfish Lake, Palau, NW equatorial Pacific Ocean. <em>The Journal of Foraminiferal Research.</em> 35(1): 44-49., available online at https://doi.org/10.2113/35.1.44
note: See also: Kawagata S., Yamasaki M., Genka R. & Jordan R.W. 2005. Shallow-water benthic foraminifers from Mecherchar Jellyfish Lake (Ongerul Tketau Uet), Palau. Micronesica 37(2): 215-233 [records subf...    
See also: Kawagata S., Yamasaki M., Genka R. & Jordan R.W. 2005. Shallow-water benthic foraminifers from Mecherchar Jellyfish Lake (Ongerul Tketau Uet), Palau. Micronesica 37(2): 215-233 [records subfossil Acarotrochus lobulatus]
[details] Available for editors  PDF available [request]

taxonomy source Hayward, B. W.; Holzmann, M.; Pawlowski, J.; Parker, J. H.; Kaushik, T.; Toyofuku, M. S.; Tsuchiya, M. (2021). Molecular and morphological taxonomy of living Ammonia and related taxa (Foraminifera) and their biogeography. <em>Micropaleontology.</em> 67: 109-274., available online at https://doi.org/10.47894/mpal.67.3.01 [details] Available for editors  PDF available [request]
From editor or global species database
Original description Diagnosis. Test free, very low trochospiral, evolute on the spiral side, involute on the umbilical side, peripheral outline lobulate in adult, peripheral margin broadly rounded; chambers slightly inflated on both sides, large lobe-like perforate folia of successive chambers on the umbilical side fusing to previous folia and foliar chambers; sutures radial, slightly depressed on spiral side and deeply incised nearly halfway from the periphery on umbilical side; wall calcareous, thin, perforate over entire test; aperture an interiomarginal, and umbilical slit opening beneath the folium, separated by a lobe issuing from the upper rim of the aperture; each folium turning backwards and in a peripheral direction, and attached to the preceding chamber, covering part of the deep intraseptal interlocular space and producing a suprasutural foliar aperture at the peripheral end of the folium; foramenal plate thin, broad and imperforate, an extension of a septal flap, attached to the adjacent previous whorl, cutting off the foliar chamberlet lumen from the main chamber lumen.
Holocene, possibly at the end of the Little Ice Age. Palau. [details]
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From editor or global species database

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