CATALOG OF ORIGINAL DESCRIPTIONS: Albatrossidium minzok Sanfilippo & Riedel 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 -> A -> Albatrossidium -> Albatrossidium minzok
Other pages this level: A. minzok

Albatrossidium minzok

Citation: Albatrossidium minzok Sanfilippo & Riedel 1992
Rank: species
Type specimens: pl.1, figs.18,19; pl.2, fig.7 (holotype)
Type repository: U.S. National Museum, Washington, D.C. [No holotype number given]
Described on page(s) : p.18
Family (traditional): Pterocorythidae
Family (modern): Pterocorythidae

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Current identification:

Original Description
Three-segmented pterocorythid with a large, distinctly pored cephalis bearing a bladed horn. The cephalis has a short, broad appearance because of the large laterally placed paired lobes, and the relatively short eucephalic lobe. Thorax is campanulate to inflated campanulate with small pores arranged quincuncially in distinct longitudinal rows that are sometimes emphasized by weak angular poreframes appearing more distinct longitudinally, and thus giving the impression of undulating ridges between the pores. Collar stricture indistinct externally as contour of cephalis merges with that of the thorax. Thorax and abdomen separated by a strong internal stricture that is only indistinctly marked externally. Quincuncially arranged pores on the cylindrical abdomen exhibit strict longitudinal alignment, usually separated by longitudinal costae. Termination undifferentiated. In early forms a vestigial wing is sometimes present, and the abdomen terminates in a hyaline zone that is 3-4 pore-rows wide and of the same thickness as the abdominal wall.

(based on 50 specimens) Length (excluding horn), 100-170µm; length of cephalothorax 60-100µm; width of thorax 60-100µm (usually about 65-90µm), width of abdomen 60-105µm. Distinguishing characters (rw): Albatrossidium minzok differs from early members of the Cryptocarpium genus by not having costae separating the longitudinally arranged pores on the thorax, and by the three-lobed cephalis having a more pterocorythid aspect than the compressed cephalis of Cryptocarpium.Albatrossidium stock by having the paired lobes more laterally placed, and a shorter eucephalic lobe, forming a broad triangular unit rather than a cylindrical one, and by its smaller size (size of descendant forms, length of cephalothorax 100-120µm; width 90-105µm). Around the time of the splitting-off of the genus Theocyrtis, the eucephalic lobe often appears as an apically open, sparsely pored short cylindrical tube with a short, weakly bladed horn extending from the wall of the tube (pl.1, figs.18, 19). It is distinguished from Theocyrtis by not developing plicae in the cephalic and collar regions.

Etymology: The name of the species is an arbitrary combination of letters, to be regarded as a noun in apposition.


Sanfilippo, A. & Riedel, W. R. (1992). The origin and evolution of Pterocorythidae (Radiolaria): A Cenozoic phylogenetic study. Micropaleontology. 38(1): 1-36. gs


Albatrossidium minzok compiled by the radiolaria@mikrotax project team viewed: 9-3-2021

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