CATALOG OF ORIGINAL DESCRIPTIONS: Lamptonium sanfilippoae Foreman 1973

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 -> Lamptonium -> Lamptonium sanfilippoae
Other pages this level: L. colymbus, L. fabaeforme chaunothorax, L. fabaeforme constrictum, L. incohatum, L. obelix, L. pennatum, L. sanfilippoae

Lamptonium sanfilippoae

Citation: Lamptonium sanfilippoae Foreman 1973
Rank: species
Type specimens: pl.6, figs.15,16, pl.11, figs.16,17
Type repository: Holotype n°USNM 178842, DSDP 10- 94-30-2, (114-116), H39/3 U.S. National Museum, Washington, D.C.
Described on page(s) : p.436
Family (traditional): Theoperidae
Family (modern): Theocotylidae

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Current identification/main database link: Lamptonium sanfilippoae Foreman 1973


Original Description
Shell of two segments, pyriform, with collar stricture not expressed externally. Cephalis subhemispherical, with a massive layer of rough shell material apically from which extends a bladed horn frequently broken. Internally the collar stricture has five collar pores, the vertical spine rising so sharply that it does not divide the cervical pore. Thorax proximally with or without one or two slight constrictions, basally closed, and tending to be flattened. Circular to subcircular pores with or without prongs on their margin may be largest medianly at point of greatest expansion and distinctly smaller, less regularly arranged basally, or more regular in size, tending to longitudinal alignment; surface spiny.

(Based on 15 specimens) Length overall, exclusive of horn, 210-325µm; greatest width 130-205µm. Distinguishing characters (rw): Specimens with a slight constriction on the proximal thorax, smaller more regular pores, and a less spiny surface are present in the younger samples. However, the number of specimens observed is too few to divide the species on the basis of these features.
These forms are apparently related to species of Lamptonium (?) described by Riedel and Sanfilippo (1970). Similarities include the shape of the thorax, the distinctive pores and surface spines, and the development of massive structure (large horn or massive layer of shell material) apically. They differ primarily in the absence of a subcylindrical, distally open third segment. A vague circular line basally, together with the less regular basal pores, suggest an earlier aperture.

Etymology: This Early Eocene closed theoperid is named for Annika Sanfilippo in recognition for her work, together with William R. Riedel, on post-Eocene closed theoperids.

Editors' Notes
This form, rare here is common in DSDP Leg 2, sample 10-9-3(125-127 cm) from the mid-Atlantic, 32°37'N, 52°20'W. The Leg 2 forms resemble the younger forms described here.

References:

Foreman, H. P. (1973a). Radiolaria of Leg 10 with systematics and ranges for the families Amphipyndacidae, Artostrobiidae, and Theoperidae. Initial Reports of the Deep Sea Drilling Project. 10: 407-474. gs


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Lamptonium sanfilippoae compiled by the radiolaria@mikrotax project team viewed: 27-2-2021

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