Heliaster

Daughter taxa (time control age-window is: 0-800Ma)
				Heliaster hexagonium neptune records:
				Heliaster sp. neptune records:

Taxonomy

Catalog entries: Heliaster

Original description: Les éléments essentiels de la coque corticale, dans ce genre, comprennent cinq baguettes creuses rayonnant à partir d'un point commun situé contre l'axoplaste. Ces baguettes ont la même disposition que celle d'un spicule pentactine d'Eponge : quatre d'entre elles sont situées dans un même plan, la cinquième dans un plan perpendiculaire au précédent. Les quatre premières baguettes, par ramifications, donnent naissance de part et d'autre du noyau à deux arcs siliceux que rendent solidaires quelques trabécules. Les cinq branches du spicule pentactine sont à l'origine des cinq premiers spicules radiaires. Les spicules surnuméraires naissent des bords des arcs siliceux. Ces spicules radiaires dont le nombre varie de 6 à 12 selon l'âge du Protiste, sont grêles et cylindriques. Au voisinage de la microsphère, ils sont tortueux et portent souvent des épines. La coque corticale est grillagée et couverte d'épines de même taille et de même longueur que les spicules. Axoplaste sphérique ou ovoïde de grande taille, entouré ainsi que la calotte nucléaire d'une aire ergastoplasmique très importante.


Translated description: The important parts of the cortical shell are five hollow rods radiating from a centre located close to the axoplast. These rods show the same distribution pattern as those of a pentactin sponge spicule: four rods are located in the same plane, the fifth is in a perpendicular plane. The first four rods have branchs which make, on each side of the nucleus, two siliceous arches linked by some spines. Secondary spines arise from the siliceous arches. These 6 to 12 radial spines (number depending upon the age of the protist) are cylindrical and thin. In the vicinity of the microsphere, they are sinuous and often thorny. Cortical shell lattice and covered with the same thorns as the spines. Axoplast big, spherical, or ovoid, enveloped with the nuclear dome by an important ergastoplasmic area. In French. Translation by J.P.C.]]
Remarks on original description: [non Heliaster Gray 1840, Echinodermata; changed to Hollandosphaera by Deflandre, 1973c, p. 1150 as name was preoccupied.]

Stratigraphic range: Recent.

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 Quaternary Period (0.00-2.59Ma, base in Gelasian 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

Heliaster 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=204246 Go to Archive.is to create a permanent copy of this page - citation notes

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