Falsotruncana

Daughter taxa (time control age-window is: 0-800Ma)
			Falsotruncana douglasi
			Falsotruncana loeblichae
			Falsotruncana maslakovae
			Falsotruncana sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: Test à trochospire basse, enroulement toujo urs senestre. Contour lobe. profil tronque par un bandeau peripherique imperfore marque parfois jusque sur les dernieres loges. borde par deux carenes pustu- leuses visibles au mains sur les trois permieres loges du dernier tour. Dans cer- tains cas, bandeau peripherique et carene pustuleuse sont nettement perfores. Ouverture principale ombilicale-extraombilicale presque peripherique, ourlee d'une levre etroite. Ombilic peu profond, evase, sans portici ni tegilla. Sutures ombilicales radiates et deprimees. Sutures spirales, radiates apeu arquees, deprimees. Chez certaines formes primitives, la surface des premieres loges (face spirale) est tres pustuleuse.

Entries in the Catalog of original descriptions: Falsotruncana

Distinguishing features:
Parent taxon (Hedbergellidae): Test trochospirally coiled, primary aperture interiomarginal, extraumbilical-umbilical, with prominent apertural lip, apertures of earlier chambers remain visible around the umbilical region; no sutural secondary apertures.
This taxon: Test in low trochospiral coil, compressed, chambers petaloid, sutures radial, slightly curved, depressed on the spiral side, radial and depressed around the shallow umbilicus on the umbilical side, peripheral margin truncate to narrowly rounded, with imperforate carinal band bordered in the earlier chambers of the final whorl by two low pustulose keels, peripheral outline lobulate; wall calcareous, perforate, rare perforations may occur in the generally imperforate carinal band, surface of earlier chambers pustulose, especially on the spiral side; primary aperture interiomarginal, umbilical-extraumbilical, nearly equatorial, bordered with a thin lip but lacking portici or umbilical extensions.

Geological Range:
Last occurrence (top): at top of M. schneegansi zone (100% up, 89.8Ma, in Turonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, base in Turonian stage). Data source: Total of ranges of species in this database

Plot of range and 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Hedbergellidae

Falsotruncana compiled by the pforams@mikrotax project team viewed: 6-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110101 Go to Archive.is to create a permanent copy of this page - citation notes

Add Comment

* Required information

Notify me of new comments via email

Remember my form inputs on this computer

I have read and agree to the terms and conditions

Powered by Commentics

x

Insert Bullet List

Please enter at least one item.

Item:

Item:

Item:

Item:

Item:

x

Insert Numeric List

Please enter at least one item.

Item:

Item:

Item:

Item:

Item:

x

Insert Image

Please enter the link of the image

x

Privacy Policy

This policy contains information about your privacy. By posting, you are declaring that you understand this policy:

• Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
• Aside from the data entered into these form fields, other stored data about your comment will include:
  • Your IP address (not displayed)
  • The time/date of your submission (displayed)
• Your email address will not be shared. It is collected for only two reasons:
  • Administrative purposes, should a need to contact you arise.
  • To inform you of new comments, should you subscribe to receive notifications.
• A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.

This policy is subject to change at any time and without notice.

x

Terms and Conditions

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.

Comments

No comments yet. Be the first!

x