CATALOG OF ORIGINAL DESCRIPTIONS: Spongurus irregularis Nishimura 1992

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: rads_cat -> S -> Spongurus -> Spongurus irregularis
Other pages this level: S. biconstrictus, S. biconstrictus triangulatus, S. bilobatus, S. cauleti, S. crispus, S. crowleysensis, S. cylindricus, S. cylindricus jh, S. elongatus, S. illepidus, S. irregularis, S. occidentalis, S. ovatus, S. phalanga, S. pylomaticus, S. pylomaticus borealis, S. radians, S. saxeus, S. smithi, S. spatulaeformis, S. spongechinus, S. stoehri, S. stuparius, S. stypticus, S. tricolus, S. yatsuoensis

Spongurus irregularis

Citation: Spongurus irregularis Nishimura 1992
Rank: species
Type specimens: pl.2, figs.7-9; pl.12, figs.3, 7
Type repository: Holotype no n°, and paratype n° LMMN AN0008-6 and LMMN AN0037-1, Laboratory of the Microfossil's study of Matsumoto, Nagano, Japan
Described on page(s) : p.327
Family (traditional): Spongodiscidae
Family (modern): Sponguridae

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Current identification:

Original Description
Shell irregularly egg-shaped or ellipsoidal, about 1.8 times longer than wide, greatest width near the middle. Shell formed with two different lobes at the opposite ends across the widest band in the middle: one composed of solid spongy cone often with several short spines on the distal end, and of only spongy meshwork with no structure internally; another composed of swollen in the middle with slightly shortly, cylindrical at distal end, rather loose spongy and of many narrow concentric rings internally, often with pylome surrounded by rings of short, needle-like spines. Shell surface generally slightly rough, while some specimens are covered by a thin, solid spongy mantle.

Based on 20 specimens. Length of shell 285-413 µ, maximum width of shell 160-213 µ, Polar length (upper side) 50-138 µ, and polar length (pylome side) 65-138 µ. Distinguishing characters (rw): This species is distinguished from other species of this genus by having two different structures at the opposite poles internally as well as externally. It is doubtfully placed in the genus Spongurus because of these two structures.

Editors' Notes
This is tentatively assigned to this genus because they have an ellipsoidal solid spongy shell rather than a latticed shell.


Nishimura, A. (1992). Paleocene radiolarian biostratigraphy in the northeast Atlantic at Site 384, Leg 43, of the Deep Sea Drilling Project. Micropaleontology. 38(4): 317-362. gs


Spongurus irregularis compiled by the radiolaria@mikrotax project team viewed: 21-4-2021

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