CATALOG OF ORIGINAL DESCRIPTIONS: Phormostichoartus schneideri Nigrini & Caulet 1992
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 Thick-walled, smooth, cylindrical shell consisting of three segments. Cephalis approximately spherical with a well developed, cylindrical, poreless vertical tube lying along the proximal part of the thorax; few, relatively large, subcircular pores, irregular in size and arrangement. Apical spine free within the cephalis, but no apical horn. Vertical spine horizontally directed along the axis of the vertical tube; dorsal spine projects as a small thorn and lateral spines create small indentations where they meet the cephalic wall. Collar stricture indistinct. Thorax short, truncate conical with subcircular pores, not uniform in size, usually in 3 or 4 transverse rows, 4 pores on a half equator. Lumbar stricture distinct, but not pronounced. Abdomen consists of two parts, a proximal, somewhat inflated, section followed by a longer, approximately cylindrical, section. There is a distinct break in contour between these parts, but no internal ring denoting true segmentation. Pores in transverse rows, fairly regular in size and arrangement proximally, but increasingly irregular distally. Six pores on a half equator at the widest part of the abdomen. Termination neat, consisting of a poreless band with small hyaline projections. It is not clear if this is a peristome with terminal teeth or the beginning of another row or pores. Size: (Based on 25 specimens): Length of cephalis l5-16µm; of thorax 19-24µm; of abdomen 70-120µm. Maximum breadth of cephalis 25-29µm; of thorax 40-47µm; of abdomen 48-62µm. Etymology: In honor of our colleague Dr. David Schneider. Extra details from original publication Distinguishing characters: This species differs from P fistula and P pitomorphus by having only three segments and by its lack of a well-developed peristome. It differs from P. caryoforma (see below) by the pronounced change in contour of its abdomen and larger size.
References:
Nigrini, C. A. & Caulet, J. (1992). Late Neogene radiolarian assemblages characteristic of Indo-Pacific areas of upwelling. Micropaleontology. 38(2): 139-164. gs
Phormostichoartus schneideri compiled by the radiolaria@mikrotax project teamviewed: 23-3-2025
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":715189,"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=715189","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.."}
Phormostichoartus schneideri Nigrini Caulet 1992.jpg
Phormostichoartus schneideri Nigrini Caulet 1992.jpg
Comments