Conoglobigerina grigelisi

Taxonomy

Original description: Low to medium high conical test with a compact spire and 3.5–4 chambers in the last whorl. H/D ratio 0.5–1, rarely over 1. No preferred coiling direction observed. The chambers of the last whorl are large and have deeply incised sutures. Last whorl strongly embraces previous (? 2) whorls such that the earlier part of the test maybe hardly visible. Apex generally blunt, rarely pointed. Umbilical area depressed. Aperture generally a more or less symmetrical arch with lip, rarely comma-shaped. Specimens may have a small bulla over the umbilicus with one or two, low-arch apertures; it may resemble the bulla structure of Cenozoic Catapsydrax taxa. Wall microperforate, strongly pustulose; pustules form low and broken ridges that create an imperfectly reticulate pattern over the surface of the chambers.

Entries in the Catalog of original descriptions: Conoglobigerina grigelisi

Distinguishing features:

Low to medium high conical test with a compact spire and 3.5 to 4 chambers in the last whorl. H/D ratio 0.5 to 1, and rarely over 1. No preferred coiling direction observed. The chambers of the last whorl are large and have deeply incised sutures. Last whorl strongly embraces previous (? 2) whorls such that the earlier part of the test may hardly be visible. Apex generally blunt, rarely pointed. Umbilical area depressed. Aperture generally a more or less symmetrical arch with lip, rarely comma-shaped. Specimens may have a small bulla over the umbilicus with one or two, low-arch apertures; it may resemble the bulla structure of Cenozoic Catapsydrax taxa. Wall microperforate, strongly pustulose; pustules form low and broken ridges that create an imperfectly reticulate pattern over the surface of the chambers.

Most likely ancestor: Globuligerina avariformis - at confidence level 2 (out of 5). Data source: Gradstein et al. (2017) p. 263.

Geological Range:
Last occurrence (top): within Early Kimmeridgian Substage (154.73-157.25Ma, top in Kimmeridgian stage). Data source: Gradstein et al. 2017
First occurrence (base): at base of Middle Oxfordian Substage (0% up, 160.8Ma, in Oxfordian stage). Data source: Gradstein et al. 2017

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Conoglobigerina

Character matrix

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Spiroconvex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low-moderate	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Globular	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Strongly depressed	umb depth:	Deep	wall texture:	Moderately pustulose	shell porosity:	-
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	3.5-4.0	N.B. These characters are used for advanced search. N/A - not applicable

References:

Gradstein, F. M. (2017a). New and emended species of Jurassic planktonic foraminifera. Swiss Journal of Palaeontology. 136(2): 161-185. gs

Gradstein, F. M., Gale, A. S., Kopaevich, L., Waskowska, A., Grigelis, A. & Glinskikh, L. (2017a). The planktonic foraminifera of the Jurassic. Part I: material and taxonomy. Swiss Journal of Palaeontology. 136(2): 187-257. gs

---

Conoglobigerina grigelisi compiled by the pforams@mikrotax project team viewed: 22-10-2019 Taxon Search: Advanced Search Short stable page link: http://mikrotax.org/pforams/index.php?id=110585 Go to Archive.is to create a permanent copy of this page - citation notes

---

Powered by Mikrotax taxonomy content management system developed by Jeremy Young

Comments (0)

No comments yet. Be the first!

Add Comment

* Required information

1000

--- Argentina Australia Austria Belgium Brazil Canada Chile China Czech Republic Denmark Egypt France Georgia Germany Greece Hungary India Iran Israel Italy Japan Malaysia Mexico Netherlands New Zealand Nigeria Norway Philippines Poland Portugal Romania Russia Spain Sweden Switzerland Tanzania UK US --- Afghanistan Albania Algeria Andorra Angola Armenia Azerbaijan Bahrain Bangladesh Belarus Belize Benin Bermuda Bhutan Bolivia Bosnia and Herzegovina Botswana Brunei Bulgaria Burkina Faso Burundi Cambodia Cameroon Central African Republic Chad Colombia Congo Costa Rica Croatia Cuba Cyprus Djibouti Dominican Republic Ecuador El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falklands Finland Gabon Gambia Ghana Greenland Guatemala Guinea Guinea-Bissau Guyana Haiti Honduras Hong Kong Iceland Indonesia Iraq Ireland Ivory Coast Jamaica Jordan Kazakhstan Kenya Kosovo Kuwait Kyrgyzstan Laos Latvia Lebanon Lesotho Liberia Libya Liechtenstein Lithuania Madagascar Malawi Mali Mauritania Moldova Monaco Mongolia Montenegro Morocco Mozambique Myanmar Namibia Nepal Nicaragua Niger North Korea Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Puerto Rico Qatar Rwanda San Marino Saudi Arabia Senegal Serbia Sierra Leone Singapore Slovakia Slovenia Somalia South Africa South Korea South Sudan Sri Lanka Sudan Suriname Swaziland Syria Taiwan Tajikistan Thailand Togo Trinidad and Tobago Tunisia Turkey Turkmenistan Uganda Ukraine United Arab Emirates Uruguay Uzbekistan Venezuela Vietnam Western Sahara Yemen Zambia Zimbabwe

Notify me of new comments via email.

Remember my form inputs on this computer.

Powered by Commentics

Please enter at least one item.

Item:

Item:

Item:

Item:

Item:

Please enter at least one item.

Item:

Item:

Item:

Item:

Item:

Please enter the link of the website

Optionally you can add display text

Please enter the email address

Optionally add any display text

Please enter the link of the image

Please enter the link of the video