radiolaria - rads_cenozoic - Larcopyle hayesi radiolaria - rads_cenozoic - Larcopyle hayesi

Larcopyle hayesi


Classification: rads_cenozoic -> Pyloniidae -> Larcopyle -> Larcopyle hayesi
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.
Sub-taxa & variants (time control age-window is: 0-800Ma)
Larcopyle hayesi hayesi

neptune records:
Larcopyle hayesi irregularis

neptune records:

Taxonomy

Citation: Larcopyle hayesi (Chen) Lazarus et al. 2005
taxonomic rank: species
Basionym: Prunopyle hayesi Chen 1975
Synonyms:
1975 Prunopyle hayesi - Chen p.454; pl.9, figs.3-5
1975 Ommatodiscus haeckeli Petrushevskaya: p. 572, pl. 32.
1989 Prunopyle sp. A Lazarus & Pallant: p. 368, pl. 8, fig. 7.
1990 Prunopyle hayesi: Abelmann; p. 693, pl. 3, fig. 14, 15.
2005 Larcopyle hayesi - Lazarus et al p.119; pl.11, figs.1-21
Taxonomic discussion:

Remarks. This species is quite variable in morphology and is divided here into two informal varieties, which have somewhat different stratigraphic ranges and geographical distribution. No formal designation of a subspecies is made, however, as there is continuous gradation between the forms and the differences between them, although real, may also possibly be produced in some specimens by differences in preservation. A more detailed examination of the structure of the shell, including interior features, will be needed before a biologically well-founded subdivision of this morphological group is possible. Note: The original type material of Chen (1975) was lost before being deposited. Therefore, a replacement type specimen is designated here. The specimen chosen shows a common morphology that is nearly intermediate between the two informally defined varieties, L. h. ‘hayesi’ and L. h. ‘irregularis’, although it would be assigned to the L. h. hayesi variety. More distinctive examples of both varieties are illustrated by other specimens in Plate 11. (from Lazarus and Pallant 2005).

L. h. hayesi and L. h. irregularis are entered in mikrotax as subspecies for simplicity, even tho the 2005 publication notes they are somewhat informal still in definition. - dbl

Catalog entries: Prunopyle hayesi

Original description: Shell prune-shaped, consisting of radiating spines and densely spiral shells. Pores circular, framed by hexagonal bars, aligned with the radiating spines through the spiral shells (plate 2, figure 2). Pylome circular, of variable diameter, surrounded by l2-19 cylindrical spines.
(Dimensions based on 35 specimens from 274-21-3,54-64 cm.; 274-21, CC; 274-22, CC; and 274-23, CC.) Major axis of shell 270-315µm. Minor axis of shell 207-252µm. Ratio of major axis to minor axis 1.11-1.34m.
Remarks on original description: Chen described this species twice - in IRDSDP vol 28 and Micropaleontology part 20/4. Both publications have cover dates of 1974 but actually were published in 1975 and the Micropaleontology volume is generally considered to be the valid publication. The images are typically the same in both, but the text is slighlty different. [JRY 2023]
As noted in Lazarus 1990 and Lazarus et al. 2005, Chen 1975 (DSDP volume 28) was originally dated 1974 by the publisher, but actually appeared in 1975, after Petrushevskaya 1975 (DSDP volume 29). Chen 1975 (Micropaleontology) was also originally dated 1974 by the publisher but appeared only in 1975 after Petrushevskaya.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Early Pliocene Sub-Epoch (3.60-5.33Ma, top in Zanclean stage). Data source: Lazarus and Pallant 2005
First occurrence (base): within Oligocene Epoch (23.03-33.89Ma, base in Rupelian stage). Data source: Lazarus and Pallant 2005

Plot of occurrence data:

References:

Abelmann, A. (1990). Oligocene to Middle Miocene radiolarian stratigraphy of southern high latitudes from Leg 113, Sites 689 and 690, Maud Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 675-708. gs

Chen, P. H. (1975a). Antarctic Radiolaria. Initial Reports of the Deep Sea Drilling Project. 28: 437-513. gs O

Lazarus, D & Pallant, A (1989). Oligocene and Neogene Radiolarians from the Labrador Sea, ODP Leg 1051. Proceedings of the Ocean Drilling Program, Scientific Results. 105: 349-380. gs

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

Petrushevskaya, M. G. (1975a). Cenozoic radiolarians of the Antarctic, Leg 29, DSDP. Initial Reports of the Deep Sea Drilling Project. 29: 541-675. gs O


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Larcopyle hayesi compiled by the radiolaria@mikrotax project team viewed: 21-2-2024

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204402 Go to Archive.is to create a permanent copy of this page - citation notes



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