Didymocyrtis

Daughter taxa (time control age-window is: 0-800Ma)
				Didymocyrtis antepenultima neptune records: 568
				Didymocyrtis avita neptune records: 231
				Didymocyrtis bassanii neptune records: 279
				Didymocyrtis ceratospyris neptune records:
				Didymocyrtis didymus neptune records: 30
				Didymocyrtis laticonus neptune records: 688
				Didymocyrtis mammifera neptune records: 328
				Didymocyrtis penultima neptune records: 803
				Didymocyrtis prismatica neptune records: 1057
				Didymocyrtis tetrathalamus neptune records: 567
				Didymocyrtis tubaria neptune records: 414
				Didymocyrtis violina neptune records: 295
				Didymocyrtis sp. neptune records: 44

Taxonomy

Catalog entries: Didymocyrtis

Original description:
1861 -  10. H. didymocyrtis. Rindenschale im Umrisse bisquitförmig, wie aus zwei ellipsoiden Schalen zusammengewachsen, in der Mitte mit einer tiefen ringförmigen Einschrung, von der rings radiale Stäbe nach dem Centrum zu der äufseren Markschale gehen. Diese ist kugelig, ihre Maschen ziemlich gleich, rund, kaum 1/5 so grofs, als die gröfsten, unregelmäfsigen, rundlichen der Rindenschale, zwischen denen rings zahlreiche, unregelmäfsig abstehende Stacheln von der Länge des Durchmessers dieser Maschen abgehen, dazwischen sehr feine Dornen. Der Durchmesser der inneren kugeligen Markschale ist halb so grofs, ihre Maschen und Balken halb so breit als die der äufseren. Die beide Markschalen umschliefsende Centralkapsel hat die Form der Rindenschale, ist aber in allen Durchmessern fast um 1/3 kleiner; sie ist gelblich, mit grofsen Olkugeln gefüllt, und von vielen gelben Zellen umgeben. Die sehr abweichende Form dieser Art, welche ganz der der Spyridinen, besonders der Galtung Ceratospyris gleicht (die aber alle ohne Markskelet sind), dürfte es passender erscheinen lassen, dieselbe als besondere Gattung: Didymocyrtis von den Haliommen zu trennen; Art: Didymocyrtis Ceratospyris.

1862 - Gattungscharakter: Skelet besteht aus drie concentrischen sphäroiden durch Radialstäbe verbundenen Gitterschalen, von denen zwei kugelige (Markschalen) innerhalb de Centralkapsel, die dritte länglich runde (Rindenschale) ausserhalb derselben liegt und durch eine mittlere Strictur in zwei gleiche Glieder geschieden wird.


Translated description:
1861 - 10. H. didymocyrtis. The cortical shell is biscuit-shaped in outline, as if two ellipsoid shells had grown together, with a deep ring-shaped notch in the middle, from which radial rods extend all around to the centre to the outer medullary shell. This is spherical, its meshes are fairly equal, round, barely 1/5 as large as the largest, irregular, round ones of the cortical shell, between which numerous, irregularly protruding spines extend the length of the diameter of these meshes, with very fine spines in between. The diameter of the inner spherical medullary shell is half as large, its meshes and bars half as wide as those of the outer shell. The central capsule enclosing both medullary shells has the shape of the cortical shell, but is almost 1/3 smaller in all diameters; it is yellowish, filled with large oil globules, and surrounded by many yellow cells. The very different form of this species, which is very similar to that of the spyridines, especially the genus Ceratospyris (which, however, all have no medullary skeleton), would make it seem more appropriate to separate it from the haliommids as a separate genus: Didymocyrtis; species: Didymocyrtis Ceratospyris.

1862 - Genus character: Skeleton consists of three concentric spheroidal lattice shells connected by radial rods, of which two spherical (medullary shells) lie within the central capsule, the third elongated round (cortical shell) lies outside it and is divided into two equal segments by a central stricture. [GT]


Remarks on original description:
The 1861 description (read in year 1860, published 1861) is for 'group II: Actinomma' of the broader group Haliomma. Haeckel thus although explicitly raising Didymocyrtis to genus level also in same publication refers to it earlier as a species within Haliomma (Actinomma).   A full, formal, standard published description is in Haeckel 1862

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database

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
• See also: customisable plot Parent: Coccodiscidae

Didymocyrtis compiled by the radiolaria@mikrotax project team viewed: 13-12-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203943 Go to Archive.is to create a permanent copy of this page - citation notes

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