CATALOG OF ORIGINAL DESCRIPTIONS: Zygostephanus bicornis Haeckel 1887

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 -> Z -> Zygostephanus -> Zygostephanus bicornis
Other pages this level: Z. bicornis, Z. dissocircus, Z. muelleri, Z. octoformis, Z. ramosus, Z. reniformis, Z. serratus, Z. violina

Zygostephanus bicornis

Citation: Zygostephanus bicornis Haeckel 1887
Rank: species
Type locality: LM41
Type age (chronostrat): [presumably Quaternary]
Type specimens: pl.93, fig.2
Type repository: No information given
Described on page(s) : p.891, 972

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Current identification:

Original Description
Frontal ring violin-shaped, on the upper and the lower margin concave, with a deep sagittal constriction; its two halves pentagonal. Between numerous smaller spines there arise from the frontal ring six groups of larger branched spines, two odd in the corners of the highest points (curved like two horns), two branched pairs on the prominent lateral corners (at right and left), and two pairs in the corners of the lowest points (like four branched basal feet). Sagittal ring only two-thirds as high, with four pairs of irregular spines.

Size: Height of the frontal ring 0.11, breadth 0.16.

Editors' Notes
Haeckel listed Zygostephanus bicornis under the subgeneric name Zygostephaniscus, but did not include the subgeneric name in the species name.

Figure. It is clear from the family discussion of Coronida (p.967-969) that haeckel meant to assign the following key to the letters on his illustration: r = primary sagittal ring; q = lateral or frontal ring.[comment from RadWorld database]


Haeckel, E (1887). Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the year 1873-1876, Zoology. 18: 1-1803. gs


Zygostephanus bicornis compiled by the radiolaria@mikrotax project team viewed: 3-3-2021

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