Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Steganocubus
Sister taxa: Amphiplecta, Antarctissa, Arachnocalpis, Arachnocorallium, Arachnocorys, Archiperidium, Archipilium, Ceratocyrtis, Cryptogyrus, Dictyocephalus, Dictyocryphalus, Entepipedus, Gondwanaria, Lipmanella, Lithocampana, Lithomelissa, Lophophaena, Marimoum, Mitrocalpis, Periarachnium, Peromelissa, Phormacantha, P. inc sed castanoides, Plectacantha, Pseudocubus, Pseudodictyophimus, Pteroscenium, Steganocubus, Tripodocyrtis, Trisulcus
Daughter taxa (time control age-window is: 0-800Ma)
Steganocubus incrassatus

neptune records:
Steganocubus irregularis

neptune records:
Steganocubus lipus

neptune records:
Steganocubus subtilis

neptune records:


Citation: Steganocubus Sugiyama, 1993
Rank: genus
Basionym: Steganocubus Sugiyama, 1993
Type species: Steganocubus subtilis Sugiyama 1993

Catalog entries: Steganocubus

Original description:

Large cephalis enclosing internal skeleton. A, two l", V" relatively long. A', D, two L, two l' and V" commonly extending to the shell wall. They are, however, sometimes reduced or absent irregularly (Fig ures 10-4b ; 11-lb). l" usually lies in a bisectional position between D and L. D' and L' vestigial (Figure 10-ld) or completely absent. V missing. L-R and Ax variable in length. A few, short connector bars irregularly developed especially on the ventral side. They connect PR and the shell wall or DR. DR lies in a high position in the cephalis. Y/X is less than 1. Thorax may be present. Remarks.—This genus is distinguished from Pseudocubus externally by the presence of the shell wall, and internally by having stout and long A', D and V', and by lacking V completely. This genus was undoubtedly derived from Pseudocubus by direct acquisition of the shell wall on the skeleton, accompanied by a certain modification of the skeletal structure. It is, therefore, clear that the segment above DR corresponds not to the whole cephalis but to the upper part of the eucephalic lobe.


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source:

Plot of occurrence data:



Steganocubus compiled by the radiolaria@mikrotax project team viewed: 19-4-2021

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