CATALOG OF ORIGINAL DESCRIPTIONS: Pulvinulina arca Cushman 1926
This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
Original Description Test biconvex, the periphery truncate, about 7 chambers in the last-formed coil; chambers very distinct; sutures both on the dorsal and ventral sides limbate, on the dorsal side curved, raised above the general surface in a distinctly beaded ornamentation, fusing with the raised periphery, the early sutures often more beaded than later ones, on the ventral side the chambers of the last-formed coil do not extend in to the center, leaving a distinct umbilical area; aperture elongate on the ventral side at the base of the last-formed chamber. Size: Diameter usually less than 1 mm. Extra details from original publication This is the most abundant of all the species of the so-called Papagallos series in the Upper Cretaceous of the Tampico region. It has a very broad distribution both geographically and vertically, in the Upper Cretaceous series. Through its wide vertical distribution, it shows several varietal forms, some of which may be more easily distinguished than others. In one of these the entire test becomes much flattened and the truncate character of the periphery is much more marked than in the typical form. In another the periphery is developed into distinct angles. Of the various varieties Pulvinulina arca Cushman, n. sp., var contusa. Cushman, n. var. is perhaps the most distinctive.
References:
Cushman, J. A. (1926c). Some foraminifera from the Mendez shale of Eastern Mexico. Contributions from the Cushman Laboratory for Foraminiferal Research. 2(1): 16-24. gs
Pulvinulina arca compiled by the pforams@mikrotax project teamviewed: 13-12-2024
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":565608,"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=565608","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.."}
Comments