Dictyospyris melissium

Taxonomy

Catalog entries: Dictyospyris melissium

Original description: Shell discoidal, very variable in size and irregularity of outline, complexly subdivided by internal structures. Externally the shell is formed of a lattice plate with numerous small, circular to subeircular pores. Near the center of one surface of the disc is a larger pore. toward which is directed an internal thorn. Interior of shell traversed by numer-ous, delicate and robust, transverse and oblique (sometimes anastomosing) rods, except for a small central area evident in some specimens as a two or three-lobed cavity. This cavity and the internal thorn directed toward the larger pore indicate that this form is an acanthodesmiid, but the complexity of the internal structures prevents our being able to determine which bars are parts of the sagittal ring or collar structures.
Remarks on original description: Because it has not been possible to determine the nature of the sagittal ring, nor the phylogenetic development of this species, its assignment to Dictyospyris is very tentative. There is some resemblance to Psychospyris, in the honeycomb-like internal structure of the peripheral part of the disc, but D. melissium has a much smaller internal cavity than the members of that genus, and its stratigraphic range is clearly prior to the origin of the Psychospyris lineage.[comment from RadWorld database]

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

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

Dictyospyris melissium compiled by the radiolaria@mikrotax project team viewed: 20-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203940 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