Actinosphaera

Daughter taxa (time control age-window is: 0-800Ma)
				Actinosphaera capillacea neptune records:
				Actinosphaera haackei neptune records:
				Actinosphaera tenella neptune records:
				Actinosphaera sp. neptune records:

Taxonomy

Catalog entries: Actinosphaera

Original description: Ce nouveau genre ne concerne pas des Radiolaires inédits. Il désigne simplement certains Sphaeroidés classés à tort par Haeckel dans le genre Haliomma. Il s'agit d'Haliomma capillaceum et d'H. erinaceum. C'est tout d'abord l'étude cytologique qui nous a permis d'entrevoir les affinités de ces deux formes avec les Rhizosphaeridés. Etudiant alors la croissance de leur squelette, nous nous sommes convaincus que, d'une façon très générale, la microsphère primitivement grillagée se complique peu à peu par adjonction, au côté externe, d'un grand nombre de trabécules surnuméraires; de grillagée, elle devient spumeuse. Avec l'âge, un tissu spongieux, analogue à celui des Rhizosphaera vient également doubler la coque corticale. Haliomma capillaceum et erinaceum ont donc un squelette assez comparable à celul des Rhizosphaera. Il n'est même qu'un seul caractère qui, au premier coup d'oeil, permette de distinguer Actinosphaera et Rhizosphaera: c'est chez Rhizosphaera seulement que les spicules radiaires perforent la coque corticale. Cette dernière, chez Actinosphaera, porte seulement des épines. Par cette affirmation nous nous mettons en contradiction avec les données de Haeckel, de Popofsky, voire d'autres auteurs classiques. C'est que ces auteurs très vraisemblablement ont nommé H. capillaceum ou erinaceum des Sphaerellaires qul en réalité sont des Rhizosphaera du type haeckeli.


Translated description: This new genus does not include new radiolarians. It includes some sphaeroids erroneously related by Haeckel to the genus Haliomma: Haliomma capillaceum and H. erinaceum. Their cytological structure initially prompted us to recognize their affinity with the rhizosphaerids. In studying the growth of their skeleton, we became convinced that, globally, the originally lattice microsphere becomes more complicated by progressive adjunction, on its external side, of numerous additional trabeculae; from latticed it becomes spumous. In adult forms, a spongious tissue similar to that of Rhizosphaera envelops the cortical shell. Haliomma capillaceum and erinaceum have, thus, a skeleton rather close to that of Rhizosphaera. There is only one characteristic that permits one, at first sight, to distinguish Actinosphaera from Rhizosphaera: only in Rhizosphaera do the radial spicules go through the cortical shell. The cortical shell of Actinosphaera only bears spines. This assertion places us in contradiction with the data published by Haeckel, Popofsky, and maybe other classical authors. It is probably because these authors gave the name of H. capillaceum or erinaceum to sphaerellarians that are some Rhizosphaera of haeckeli-type. (In French. Translation by J.P.C.)]

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 Neogene Period (2.59-23.03Ma, base in Aquitanian 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Actinommidae inc sed

Actinosphaera compiled by the radiolaria@mikrotax project team viewed: 17-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/bforams/index.php?id=203039 Go to Archive.is to create a permanent copy of this page - citation notes

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