CATALOG OF ORIGINAL DESCRIPTIONS: Actissa princeps 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 -> A -> Actissa -> Actissa princeps
Other pages this level: A. discoides, A. ellipsoides, A. larcoides, A. lenticularis, A. phacoides, A. princeps, A. prototypus, A. prunoides, A. radiata

Actissa princeps

Citation: Actissa princeps Haeckel 1887
Rank: species
Type specimens: pl.1, fig.1, fig.1a-b, fig.1c
Type repository: No information given
Described on page(s) : p.13
Family (traditional): Collodaria
Family (modern): Thalassicollidae

<% linkedspecs %>

Current identification:

Original Description
Central capsule spherical, colourless or a little reddish, transparent, with a thick double-edged membrane. Nucleus central, spherical, one-third as broad as the central capsule, containing a single, central, glossy nucleolus. Protoplasm finely granulated, without oil-globules, with numerous clear spherical vacuoles of equal size and at equal distances; the superficial layer of protoplasm (immediately below the membrane) radially striated (fig. 1). In some older specimens the nucleus was divided into numerous small nuclei (fig. 1a), which by further division gave the nuclei of the flagellated spores (fig. 1b); each spore with a very thin lateral flagellum (fig. 1c). Jelly-like calymma twice as broad as the enclosed capsule, without xanthellae or yellow cells, pierced by innumerable, very thin and long, undivided pseudopodia, which arise from the sarcode-matrix on the outside of the membrane (six to eight times longer than shown in fig. 1).

Diameter of the central capsule 100µm to 120µm, of the nucleus 30 to 40µm, of the jelly calymma 200 to 300µm.

Editors' Notes
Haeckel listed Actissa princeps under the subgeneric name Procyttarium, but did not include the subgeneric name in the species name.


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


Actissa princeps compiled by the radiolaria@mikrotax project team viewed: 19-4-2021

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics