CATALOG OF ORIGINAL DESCRIPTIONS: Lithatractus santaeannae Campbell & Clark 1944

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 santaeannae
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 santaeannae

Citation: Lithatractus santaeannae Campbell & Clark 1944
Rank: species
Type specimens: pl.2, figs.20-22
Type repository: No holotype given, slides at University of California, Museum of Paleontology.
Described on page(s) : p.19
Family (traditional): Actinommidae
Family (modern): Amphisphaeridae

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Current identification:

Original Description
Shell large, egg-shaped, with two strong, opposite, equal, polar spines (our specimen tipped up), spines shorter than vertical axis of shell (ratio of 1:1.4), strongly conical (7°) in side view, very thick (0.2 its own length at base), swordlike in proximal 0.67, with three equal, equidistant, slightly sinuous, peripherally thick (decurrent, thickest at base) blades, latter port circular in section, tip sharp, and base with blades separated merged on shell surface; cortical shell elliptical (its minor axis 0.86 major axis) and regularly contoured; medullary shell large (at least half cortical shell), similarly shaped and contoured; radial supports two very thick polar rods, four transverse and radial bars thinner than polar; pores of cortical shell large, subcircular, deeply set into thick framework which has short, blunted sepaloid points, subuniform in size, and of similar form, about eight or nine in vertical axis, fewer in transverse axis, pores of medullary shell subhexagonal, smaller than those of cortical shell, shallow, framework less heavy than cortical framework.

Length, total, 340µm, of polar spines, 100µm; diameter of long axis of shell, 140µm, of short axis, 120µm, of cortical pores, 19.8µm, of medullary pores, 13.2µm. Distinguishing characters (rw): Lithatractus santaeannae n. sp. is a heavy-set, strong species unlike others of genus.

Etymology: [Probably after Santa Anna, California]

Editors' Notes


Campbell, A. S. & Clark, B. L. (1944a). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs


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

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