radiolaria - rads_cenozoic - Larcopyle titan radiolaria - rads_cenozoic - Larcopyle titan

Larcopyle titan


Classification: rads_cenozoic -> Pyloniidae -> Larcopyle -> Larcopyle titan
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 titan (Campbell&Clark) Lazarus et al. 2005
taxonomic rank: species
Basionym: Prunopyle titan Campbell & Clark 1944
Synonyms:
1975 Prunopyle titan - Chen pl. 23, figs 1, 2
1976 Prunopyle titan - Weaver p. 578, pl. 7, fig. 6
1990 Prunopyle titan - Lazarus pl. 5, figs. 1-4
1944 Prunopyle titan - Campbell and Clark p.20; pl.3, figs.1-3
2005 Larcopyle titan - Lazarus et al p.111; pl.4, figs.11-17
2005 Larcopyle polyacantha titan - Lazarus et al p.108; pl. 3, figs. 1-12

Catalog entries: Prunopyle titan

Original description: Shell generally ovate, large, with distinct osculum; egg-shaped shell stoutly proportioned (1.5-1.6 times its maximum diameter in length), with evenly contoured walls which round off at unmodified apical end and which end antapically at extended osculum; osculum subtubular, very short (less that, 0.1 total length in length and 0.2 greatest diameter in diameter), with about 16 projecting, slightly incurved spines around its margin and acting as stays; wall fairly thick; surface smooth; pores of shell very closely set, small (less than 4.4µm), circular, at inner ends of tubules connecting with surface, tubules mostly directed apically, pores on osculum similar but set farther apart, and not deep-set.

Description


Published descriptions


Lazarus et al 2005 - Prunopyle titan

 Remarks: In comparison to L. p. titan, true L. titan is more nearly spherical in overall shape, has a largely non-spinose outer shell, and the interior structures are poorly developed, being either weakly spongiose or, in many specimens, nearly hollow. Several specimens from Campbell and Clarks (1944) type series material are re-illustrated in Plate 4. True L. titan is restricted to earlier Miocene sediments in the Antarctic. Campbell and Clark comment on a large size range in this species, but this has not been noted in the specimens curated in the Museum in Berkeley, which also are slightly smaller (c. 200 µm) in length, not counting pylome, than given by Campbell and Clark (1944).


Lazarus et al 2005 - Prunopyle titan

Derivation of name. The name refers to the slightly asymmetric ellipsoidal shape of the shell.

Holotype: Plate 6, figs 13, 689B-6H-1, 59 61 cm (Middle Miocene, Weddell Sea). Museum für Naturkunde, Mikropaläontologie No. ECO-19.

Description: The shell is elongate egg-shaped and about 120 µm long. The interior of the shell is usually empty, although a delicate set of widely spaced elongated medullary shells can be seen in some specimens. A well-developed pylome with teeth is visible at one pole, which often forms a tube-like structure. The medium-sized pores are circular and rather regularly arranged. They are surrounded by weak frames. The surface varies from smooth to somewhat thorny due to variably developed pore frames. The outer shell wall is rather thin.

Occurrence: Early Miocene Mid Miocene, scattered, rare questionable occurrences to the Early Pliocene.

Remarks: Differs from Cenolarcopyle fragilis Tan, 1927 (described from tropical sediments of uncertain Tertiary age), despite a superficial similarity in overall shell shape, in that, according to Tan Sin Hok's description, C. fragilis has a pylonid (larnacilla) inner shell, irregularly distributed pores on the cortical shell and is significantly smaller (length 105 µm).


Biogeography and Palaeobiology


Similar species

titan

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"

Plot of occurrence data:

References:

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

Lazarus, D. (1990). Middle Miocene to Recent radiolarians from the Weddell Sea, Antarctica, ODP Leg, 113. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 709-727. 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

Weaver, F. M. (1976). Antarctic Radiolaria from the southeast Pacific basin, Deep Sea Drilling Project, Leg 35. Initial Reports of the Deep Sea Drilling Project. 35: 569-603. gs

Missing or ambiguous references: Chen 1975;


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Larcopyle titan compiled by the radiolaria@mikrotax project team viewed: 13-7-2024

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