CATALOG OF ORIGINAL DESCRIPTIONS: Lithatractus fragilis 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 -> L -> Lithatractus -> Lithatractus fragilis
Other pages this level: L. birostratus, L. carduelis, L. cirsium, L. conifer, L. conostylus, L. convallaria, L. echiniscus, L. floridus, L. fragilis, L. gamoporus, L. hederae, L. hexagonalis, L. jugatus, L. leptostylus, L. lobatus, L. miocaenica, L. nucleolus, L. nuphar, L. pachystylus, L. pierinae, L. pterosphaerus, L. rosetta, L. santaeannae, L. santaeannae pusillus, L. timmsi, L. timmsi quadrispinus

Lithatractus fragilis

Citation: Lithatractus fragilis Haeckel 1887
Rank: species
Type locality: LM28
Type age (chronostrat): [presumably Quaternary though some forms reported from this station appear to be Tertiary]
Type specimens: pl.16, fig.3
Type repository: No information given
Described on page(s) : p.319

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Current identification:


Original Description
Outer shell thin walled, smooth, without thorns or papillæ, with regular network; the meshes circular, of equal size, eight to ten times as broad as the thin bars; six to eight on the half equator. Proportion of the major axis of the ellipsoid to the minor = 5: 4. Minor axis once and one-third as broad as that of the ellipsoidal inner shell, the pores of which are also circular, but of half the size. Two spines strong, three-sided pyramidal, acute, as broad as a large mesh, as long as the equatorial axis. The stout inner prolongations of these form the only connection between the two shells.

Size: Longer axis of the ellipsoidal cortical shell 120µm, shorter axis 100µm; pores 20µm, bars 2µm; longer axes of the ellipsoidal medullary shell 90µm, shorter axis 70µm; pores 10µm, bars 2µm; length of the polar spines 100µm, basal breadth 2µm.

Editors' Notes
Haeckel listed Lithatractus fragilis under the subgeneric name Lithatractara, but did not include the subgeneric name in the species name.
The same figure reference is given for Stylosphaera fragilis.[comment from RadWorld database]

References:

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


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Lithatractus fragilis compiled by the radiolaria@mikrotax project team viewed: 20-4-2021

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