Heliaster hexagonium

Taxonomy

Catalog entries: Heliaster hexagonium

Original description: Cette espèce, l’unique du genre, offre une incontestable ressemblance avec Haliomma hexagonium décrit par H aeckel (1887). Peut-être cette dernière forme tombera-t-elle en synonymie avec Heliaster hexagonium ? Microsphère : 40-50 [x. Coque corticale : 230 fi. Les pores de la coque corticale sont hexagonaux dans les formes jeunes, et limités par des trabé­ cules minces; ils deviennent circulaires dans les individus plus âgés par suite d’un dépôt de silice au côté interne du cadre primitif. On compte de 5 à 12 spicules selon l’âge. Ces spicules sont grêles et leur longueur au-delà de la coque corticale est de 75 tx environ. La longueur des épines qui couvrent la coque est à peu près la même. Parmi ces épines, quelques- unes sont plus ou moins couchées, voire tordues, parfois encore pourvues de quelques denti- cules très petits. 
 Capsule centrale (180 fx) sphérique (PI. X X II fig. 7), limitée par une membrane d’une grande ténuité. Fusules assez espacées, inégalement développées, mais jamais de grande taille. Endoplasme creusé de vacuoles dont le nombre et la taille varient d’un individu à l’autre. Il renferme fréquemment, mais non toujours, des cristaux éosinophiles cubiques. Axoplaste sphérique ou ovoïde, très volumineux, baignant ainsi que la calotte nucléaire au sein d’un ergastoplasme très peu chromatique. Cytoplasme axoflagellaire traversé par une dizaine de très gros axopodes. Pigments péricapsulaires bleu. Xanthelles abondantes. 
 Baie d’Alger : février 600, octobre 200-0, novembre 800-200-100-0, décembre o mètre. Très abondant en surface. Recueilli également à Villefranche en surface (octobre).
Translated description: This species, the only one of its genus, bears an undeniable resemblance to Haliomma hexagonium described by Haeckel (1887). Perhaps the latter form will become synonymous with Heliaster hexagonium? Microsphere: 40-50 µm. Cortical shell: 230 µm. The pores of the cortical shell are hexagonal in young specimens and bordered by thin trabeculae; they become circular in older individuals due to silica deposition on the inner side of the primitive framework. There are 5 to 12 spicules, depending on age. These spicules are slender, and their length beyond the cortical shell is approximately 75 µm. The spines covering the shell are about the same length. Some of these spines are more or less recumbent, even twisted, and sometimes still bear a few very small denticles.
Central capsule (180 µm) spherical (Pl. XXII fig. 7), bounded by a very thin membrane. Fusules fairly spaced apart, unevenly developed, but never large. Endoplasm ridged with vacuoles whose number and size vary from one individual to another. It frequently, but not always, contains cubic eosinophilic crystals. Axoplast spherical or ovoid, very large, bathing, along with the nuclear cap, a very slightly chromatic ergastoplasm. Axoflagellate cytoplasm traversed by about ten very large axopodia. Pericapsular pigments blue. Xanthellae abundant.
Bay of Algiers: February 600, October 200-0, November 800-200-100-0, December 0 meters. Very abundant at the surface. Also collected at Villefranche at the surface (October). (gs)

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R 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: Heliaster

Heliaster hexagonium compiled by the radiolaria@mikrotax project team viewed: 17-6-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204247 Go to Archive.is to create a permanent copy of this page - citation notes

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