CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina paravenezuelana Hofker 1956
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.
Citation: Globigerina paravenezuelana Hofker 1956Taxonomic rank: speciesType specimens: Text-fig. 93; Holtype P4913; paratypes P4914Type sample (& lithostrat): Jusa formation, neritic facies. Other figured specimens (tf. 94, part ) from the Upper Eocene, San Mateo formation, neritic facies, in sediments overlying light-colored tuffaceous shales. Occurs also in the Upper Eocene Seca and Zapallo formations, in the neritic, reefal, and radiolarian facies.Type age (chronostrat): Holotype (tf. 93) and some figured specimens (tf. QLJ, part ) from the Upper EoceneType locality: Holotype (tf. 93) and some figured specimens (tf. 94, part) from between the two main tributaries of the Rio Jusá, 14-15 km. east-southeast of Colonche, 13.5 km. north and 75 km. west from the Plaza del Centenario monument in Guayaquil, Guayas Province, southwestern Ecuador. Other figured specimens (tf. 94, part) from subsurface cores from a well drilled near Manta, Manabí Province, west-central Ecuador. Found also at two other localities in Guayas Province; at one other locality in Manabí Province; and at one locality in Esmeraldas Province, north western Ecuador. Generally abundant.Type repository: Washington; USNM
Original Description Usually four chambers in the last-formed whorl, the rate of increase in chamber size accelerating with growth, the average length-ratio of successive chambers being 1.1:1, whereas between the last two and the previous two of the final coil it is 1.3:1. The last two chambers are very much inflated toward the ventral side. There is a small umbilical area on the ventral side, overhung by the large aperture. The aperture is very wide and always bordered by a distinct rim; it is always in the umbilical area and not near the margin. The pore index is 4(5)-2, X 500 (an average of four or five pores per square centimeter, with an average diameter of 2 mm., at a magnification of 500X). The surface of the test shows conspicuous pits in which the pores are situated, but there is no real reticular ornamentation, especially in the last - formed chambers. " Size: Test of medium size, greater diameter 0.30-0.48 mm., lesser diameter 0.27- 0.40 mm., thickness 0.24- 0.35 mm. Extra details from original publication
Editors' Notes Problematica - Probably a subbotinid of the eocaena group. [Huber et al. 2006, p. 507]
References:
Hofker, J. (1956e). Tertiary foraminifera of coastal Ecuador; Part II - Additional notes on the Eocene species. Journal of Paleontology. 30(4): 891-958. gs
Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 16): 461-508. gsO
Globigerina paravenezuelana compiled by the pforams@mikrotax project teamviewed: 16-2-2025
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":643793,"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=643793","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