radiolaria - rads_cenozoic - Larcopyle augusti radiolaria - rads_cenozoic - Larcopyle augusti

Larcopyle augusti


Classification: rads_cenozoic -> Pyloniidae -> Larcopyle -> Larcopyle augusti
Sister taxa: L. augusti, L. buetschlii, L. eccentricanoides, L. eccentricum, L. frakesi, L. hayesi, L. labyrinthusa, L. molle, L. nebulum, L. peregrinator, L. polyacantha, L. pulchella, L. pylomaticus, L. titan, L. weddellium, L. sp.

Taxonomy

Citation: Larcopyle augusti Lazarus et al. 2005
taxonomic rank: species
Basionym: Larcopyle augusti
Synonyms:
2005 Larcopyle augusti - Lazarus et al. p.113; pl. 8; figs. 1-13

Catalog entries: Larcopyle augusti

Original description: The subcylindrical skeleton is about 150 μm long. There is an unusually large distance between the outer wall and the central layers of the shell. In many specimens the outer wall is absent, either due to breakage or incomplete development. The central shell shows caps, which are arranged one on top of the other, so the shell looks like a biconcave lens in cross- section. The thin outer wall is perforated by large circular pores of irregular size, which lack frames. It is connected with the central shell by long spines. A pylome is not obvious. Late Miocene specimens become more spongy.

Description


Published descriptions


Lazarus et al. 2005 - Larcopyle augusti

Derivation of name: In reference to the extended external shell or mantle, which gives this form a majestic dignity or grandeur (Webster's New Collegiate Dictionary).

Holotype: Plate 8, figs 1, 2; 751A-9-5,98 #1 (Late Miocene, Kerguelen). Museum für Naturkunde, Mikropaläontologie No. ECO-21.

Description: The sub-cylindrical skeleton is about 150 µm long. There is an unusually large distance between the outer wall and the central layers of the shell. In many specimens the outer wall is absent, either due to breakage or incomplete development. The central shell shows caps, which are arranged one on top of the other, so the shell looks like a biconcave lens in cross- section. The thin outer wall is perforated by large circular pores of irregular size, which lack frames. It is connected with the central shell by long spines. A pylome is not obvious. Late Miocene specimens become more spongy.

Occurrence: Middle Miocene Late Miocene.

Remarks: As noted under L. pylomaticus, L. augusti appears to evolve into L. pylomaticus in the Late Miocene. Transitional forms are noted separately in the range chart (Table 1).


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Late Miocene Sub-Epoch (5.33-11.62Ma, top in Messinian stage). Data source: Lazarus et al. 2005
First occurrence (base): within Middle Miocene Sub-Epoch (11.62-15.97Ma, base in Langhian stage). Data source: Lazarus et al. 2005

Plot of occurrence data:

References:

Lazarus, D., Faust, K. & Popova-Goll, I. (2005). New species of prunoid radiolarians from the Antarctic Neogene. Journal of Micropalaeontology. 24(2): 97-121. gs


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Larcopyle augusti compiled by the radiolaria@mikrotax project team viewed: 16-7-2024

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