Hexalonche amphisiphon

Taxonomy

Catalog entries: Hexalonche amphisiphon

Original description: Cortical shell thin walled, armed with very numerous bristle-shaped, radial by-spines, a quarter to a half as long as the six main spines. Pores regular hexagonal, twelve to fourteen on the radius, with very thin bars, prolonged on the outer as well as the inner surface into a short truncated conical tube (Pl. 25, fig. 2b). Medullary shell octahedral, with irregular polygonal meshes and very thin bars between them (fig. 2a), connected with the outer (six to eight times larger) shell by six very thin radial beams. These are prolonged outside into six strong pyramidal spines, nearly as long as the diameter of the outer shell, with sharp straight edges, at the base twice as broad as one pore.

Diameter of the outer shell 0.15, pores 0.01, bars 0.001; inner shell 0.02 length of the spines 0.12, basal breadth 0.02. [dimensions in mm]
Remarks on original description: Haeckel listed Hexalonche amphisiphon under the subgeneric name Hexalonchetta, but did not include the subgeneric name in the species name.

Figure Description: the statement "(Below the centre of the Plate, also lettered 3a by mistake.)" which is part of the description of fig. 2b does not apply here. Rather it applies to fig. 3b which illustrates Hexalonche rosetta Haeckel, 1887a.

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: Hexalonche

Hexalonche amphisiphon compiled by the radiolaria@mikrotax project team viewed: 21-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204298 Go to Archive.is to create a permanent copy of this page - citation notes

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