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 -> Alacorys
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Alacorys bismarckii Haeckel 1887

Alacorys carcinus Haeckel 1887

Alacorys dodecantha Haeckel 1887

not figuredAlacorys enneacantha Haeckel 1887

Alacorys friderici Haeckel 1887

not figuredAlacorys gigas Haeckel 1887

Alacorys guilelmi Haeckel 1887

not figuredAlacorys hexacantha Haeckel 1887

not figuredAlacorys hexapleura Haeckel 1887

Alacorys lutheri Haeckel 1887

not figuredAlacorys octacantha Haeckel 1887

not figuredAlacorys polyacantha Haeckel 1887


Citation: Alacorys Haeckel 1887
Rank: genus
Described on page(s) : 1370
Family (traditional): not-known

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Current identification:

Original Description
Theophormida (vel Tricyrtida multiradiata aperta) with numerous radial ribs in the abdomen, which are prolonged over the mouth into free feet.

The genus Alacorys and the following Cycladophora differ from the preceding two genera in the formation of the radial ribs, which arise from the lumbar stricture, and lie in the wall of the abdomen, but are absent on the thorax. The shell is usually large, more or less pyramidal or conical, with a wide open terminal mouth. The latter is in Cycladophora simply truncate, whilst in Alacorys it is surrounded by from four to twelve or more terminal feet, prolongations of the abdominal ribs. According to the different number of these (four, five, six, or more) some subgenera may be distinguished, as Tetralacorys, Pentalacorys, Hexalacorys, &c.

Etymology: Greek alacorys = sing-helmet"

Extra details from original publication

Sub-genera described:

Editors' Notes
[Although Haeckel here refers to p.436 of his Prodromus of 1881, there is no generic name on that or any other page of that reference related to the name Alacorys. Therefore, since the name Alacorys dates from 1887 and three of the six subgeneric names, Tetralacorys, Pentalacorys, and Hexalacorys, date from 1881, one fo the latter three names must be treated as the nominate subgenus and replace Alacorys.

Junior objective synonym of Tetralacorys Haeckel, 1881a

The ""preceeding two genera"" refers to Theophormis and Phormocyrtis Haeckel, 1887a.]

[Synonymized with TETRALACORYS by Petrushevskaya, 1981a, p.225]


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


Alacorys compiled by the radiolaria@mikrotax project team viewed: 12-5-2021

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