Citation: Alisphaera unicornis Okada & McIntyre, 1977taxonomic rank: SpeciesTaxonomic discussion: Historically this was the most commonly recorded species, but many records are probably of other species.
Distinguishing features: Parent taxon (Alisphaera): Coccoliths placolith-like, with asymmetrical distal flange This taxon: Most coccoliths with well-developed horn-like spine on left-side of the broad margin of the flange. Teeth absent.
Lith size: 1.5->3.1µm; Coccosphere size: 10->16µm; Liths per sphere: 80->150 Data source notes: lith size from Kleijne et al. 2002 and slightly extended; csph size from illustrated specs; csph data from Cros & Fortuño 2003; lith numbers from Yang & Wei 2003, range of estimates
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003) First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: [JRY rough estimate]
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Alisphaera
References:
Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs
Kleijne, A., Jordan, R. W., Heimdal, B. R., Samtleben, C., Chamberlain, A. H. L. & Cros, L. (2002). Five new species of the coccolithophorid genus Alisphaera (Haptophyta) with notes on their distribution, coccolith structure and taxonomy. Phycologia. 40(6): 583-601. gs
Konno, S. & Jordan, R. W. (2006). Lagoon coccolithophorids from the Republic of Palau, NW Equatorial Pacific. Journal of Nannoplankton Research. 28(2): 95-110. gsO
Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs
Steinmetz, J. C. (1991). Calcareous nannoplankton biocoenosis: sediment trap studies in the Equatorial Atlantic, Central Pacific, and Panama Basin. Woods Hole Oceanographic Institution Report. 1: 1-85. gs
Supraha, L., Ljubesic, Z. & Henderiks, J. (2018). Combination coccospheres from the Eastern Adriatic coast: New, verified and possible life-cycle associations. Marine Micropaleontology. 141: 23-30. gs
Yang, T. -N., Wei, K. & Wu, J. -T. (2012). Marine coccolithophores around Taiwan. Biodiversity Research Center, Academica Sinica, Taipei. 1-96. gs
Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs
Alisphaera unicornis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-9-2024
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
{"commentics_url":"\/\/www.mikrotax.org\/comments\/","page_id":450342,"enabled_country":true,"country_id":0,"enabled_state":false,"state_id":0,"enabled_upload":false,"maximum_upload_amount":3,"maximum_upload_size":5,"maximum_upload_total":5,"captcha":true,"captcha_url":"https:\/\/www.mikrotax.org\/comments\/frontend\/index.php?route=main\/form\/captcha&page_id=450342","cmtx_wait_for_comment":"cmtx_wait_for_comment","lang_error_file_num":"A maximum of %d files are allowed to be uploaded","lang_error_file_size":"Please upload files no bigger than %.1f MB in size","lang_error_file_total":"The total size of all files must be less than %.1f MB","lang_error_file_type":"Only image file types are allowed to be uploaded","lang_text_loading":"Loading ..","lang_placeholder_country":"Country","lang_placeholder_state":"State","lang_text_country_first":"Please select a country first","lang_button_submit":"Add Comment","lang_button_preview":"Preview","lang_button_remove":"Remove","lang_button_processing":"Please Wait.."}
JRYSEM-113-23p.JPG
Kleijne et al 2002 f 46.JPG
Kleijne et al 2002 f 48.JPG
Kleijne et al 2002 f 49.JPG
JRYSEM-289-11.JPG
Cros & Fortuno 2002 f076A.jpg
JRYSEM-228-33a.JPG
Konno_and_Jordanpl7-11.JPG
Supraha et al 2018 f03a.JPG
Young_etal_2003_113-23.JPG
Okada & McI 1977 pl06 07.jpg
Kleijne et al 2002 f 50.JPG
Kleijne et al 2002 f 51.JPG
Kleijne et al 2002 f 52.JPG
Yang et al 2012 pl14c.JPG
Yang et al 2012 pl14d.JPG
JRYSEM-105-12.JPG
Young_etal_2003_126-40.JPG
Cros & Fortuno 2002 f076B.jpg
Konno_and_Jordanpl7-12.JPG
Young_etal_2003_136-34.JPG
Kleijne et al 2002 f11 09.JPG
Comments