radiolaria - rads_cat - Steganocubus

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Steganocubus

Citation: Steganocubus Sugiyama, 1993

Type species: Steganocubus subtilis Sugiyama 1993

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.

References:

Sugiyama, K. (1993). Skeletal structures of Lower and Middle Miocene Lophophaenids (Radiolaria) from central Japan. Transactions and Proceedings of the Palaeontological Society of Japan. 169: 44-72. gs

				Steganocubus incrassatus Funakawa 1995 = Steganocubus incrassatus
				Steganocubus irregularis Funakawa 1995 = Steganocubus irregularis
				Steganocubus lipus Sugiyama 1993 = Steganocubus lipus
				Steganocubus subtilis Sugiyama 1993 p.56, 58 = Steganocubus subtilis

CATALOG OF ORIGINAL DESCRIPTIONS: Steganocubus Sugiyama, 1993

Steganocubus

References:

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