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QQ
1900 Tetrahedrina elongata - Vinassa de Regny p.581; pl.2, fig.31
1973 Lychnocanoma elongata - Sanfilippo et al p.221; pl.5, fig.19-20
1980 Lychnocanoma elongata - Sakai p.710, pl.9, fig.4
1990 Lychnocanium elongata - Nishimura p.133; pl.27, figs.4a-6
1992 Lychnocanoma elongata - Sugiyama and Furutani p.210; pl.17, fig.2a-b
From Suzuki Paleotax db:
1900 Tetrahedrina elongata n. sp. Vinassa de Regny p. 581, pl. 2, fig. 31
1973 Lychnocanoma elongata (Vinassa de Regny) Sanfilippo et al. p. 221-222, pl. 5, figs. 19, 20
1973 Lychnocanoma sp. aff. L. elongata (Vinassa) Riedel & Sanfilippo p. 739, pl. 1, fig. 1
1974 Lychnocanoma elongata (Vinassa) Johnson p. 548
1975 Lychnocanoma elongata (Vinassa) Ling p. 729, pl. 10, fig. 11
1977 Lychnocanoma elongata (Vinassa) Riedel & Sanfilippo pl. 16, fig. 5
1978 Lychnocanoma elongata (Vinassa) Riedel & Sanfilippo p. 70, pl. 7, fig. 4
1979 Lychnocanoma elongata (Vinassa) Nakaseko et al. pl. 8, figs. 1, 2
1980 Lychnocanoma elongata (Vinassa) Sakai p. 710, pl. 9, fig. 4
1980 Lychnocanomma elongata (Vinassa) [sic] Ling p. 368, pl. 2, fig. 12
1982 Lychnocanoma cfr. elongata (Vinassa) Nagata pl. 1, fig. 9
1982 Lychnocanoma elongata (Vinassa) Nagata pl. 4, fig. 6
1983 Lychnocanoma elongata (Vinassa) Srinivasan et al. p. 14, pl. 4, fig. 20
1984 Lychnocanoma elongata (Vinassa) Nigrini & Lombari N119-N120, pl. 24, figs. 2a, 2b
1985 Lychnocanoma elongata (Vinassa) Sanfilippo et al. p. 676, figs. 19.1a, 19.1b
1986 Lychnocanoma elongata (Vinassa) Levyikina p. 90, pl. 4, fig. 1
1988 Lychnocanoma cf. elongata (Vinassa) Suyari & Yamasaki pl. 6, fig. 1
1989 Lychnocanoma elongata (Vinassa) Yanagisawa et al. pl. 12, fig. 10
1990 Lychnocanium elongata (Vinassa) Nishimura p. 133, figs. 27.4a-27.6
1992 Lychnocanoma elongata (Vinassa) Sugiyama & Furutani p. 210, pl. 17, figs. 2a, 2b
1992 Lychnocanoma elongata (Vinassa) Wang & Yang p. 106, pl. 1, figs. 12, 13
1993 Lychnocanoma elongata (Vinassa) Sugiyama fig. 3.1
1995 Lychnocanoma elongata (Vinassa) Sanfilippo & Nigrini p. 282, pl. 4, fig. 11
2006 Lychnocanoma elongata (Vinassa de Regny) Nigrini et al. p. 44
2012 Lychnocanoma elongata (Vinassa de Regny) Kamikuri et al. pl. 2, fig. 11
Catalog entries: Tetrahedrina elongata
type image: T. elongataOriginal description: Guscio grande, molto spesso, ellitico obovato, tutto scabroso, con pori circulari, profondi, assai radi, regolari, alternanti. Capo con grosso e robusto corno, lungo ed ottuso. Torace chiuso da una calotta convessa irregolarmente perforata, e munita di grandi appendici molto larghe ed acute, un poco flessuose.
Sanfilippo et al 1973 - Tetrahedrina elongata Remarks: Although Vinassa de Regny's generic assignments of his three species listed above imply that his forms have three feet, our examination of samples from Montegibbio and other Mediterranean Neogene localities convinces us that his T. golbosa, T. elongata and A. hirta are conspecific with L. bipes, and that he made the unwarranted assumption that one foot was broken off of his illustrated specimens. On the other hand, our re-examination of Sicilian assemblages confirms Riedel's (1959) earlier conclusion that Sthr's Pterocanium bibrachiatum was based on three-footed specimens from which one foot had been broken off. Of the three conspecific names employed by Vinassa de Regny that could be used for this species, we have selected elongata because its illustration is of a specimen most nearly typical of this species. Specimens from the Mediterranean Neogene are quite similar to those of the tropical Pacific. They have two robust, bladed feet and often a delicate, lamellar abdomen. Nishimura 1990 - Tetrahedrina elongata Description: Outer shape of cephalis including apical spine conical, about 50 µm in width. Inner form of cephalis spherical or subspherical in all growth stages. Thorax subspherical or campanulate, 150 µm in diameter. Thoracic wall with rough surface and nodes on each nodal point of lattice. Nodes become large in mature specimens. Two feet stout and tribladed, more than 350 µm in length. Peristome slightly constricted. Basal aperture is almost circular, 75-80 µm in diameter. Irregular lattice structure developed below thorax in mature specimens. Remarks: This species differs from other species of this genus in having two feet. Occurrence: Loc. B83, siliceous clay at Lat. 0° 58 S, Long. 18° W, depth 5,359 m (Recent). Reg. nos. IGUT HN601804, 601904, 602021. Sugiyama and Furutani 1992 - Tetrahedrina elongata Internal spicule of theoperid type; D extends downward into the base of one foot; two L also extending into thoracic wall but without forming protrusions outside shell wall. Another foot situating at the ventral side of the sagittal plane is free from all internal skeleton. This species has a quite peculiar relationship between the arrangement of two feet and the internal skeleton. Such a type of skeletal protrusion is somewhat similar to Jurassic species of the genera Ares De Wever, 1981, Turanta Pessagno and Blome, 1982, and Parares Takemura, 1986. The ventral foot of this species is, however, not a prolongation of V in contrast to those of the three genera.
Published descriptions
Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"
Plot of occurrence data:
Nishimura, H. (1990). Taxonomic study on Cenozoic Nassellaria (Radiolaria). Science Reports of the Institute of Geosciences, University of Tsukuba. 11: 69-172. gs Riedel, W. R. & Sanfilippo, A. (1971). Cenozoic Radiolaria from the western tropical Pacific, Leg 7. Initial Reports of the Deep Sea Drilling Project. 7: 1529-1666. gs Sakai, T. (1980). Radiolarians from Sites 434, 435 and 436, northwest Pacific, Leg. 56, DSDP. Initial Reports of the Deep Sea Drilling Project. 56-57: 695-733. gs Sanfilippo, A., Burckle, L. H., Martini, E. & Riedel, W. R. (1973). Radiolarians, diatoms, silicoflagellates and calcareous nannofossils in the Mediterranean Neogene. Micropaleontology. 19(2): 209-234. gs Sugiyama, K. & Furutani, H. (1992). Middle Miocene radiolarians from the Oidawara Formation, Mizunami Group, Gifu Prefecture, central Japan. Bulletin of the Mizunami Fossil Museum. 19: 199-213. gs Vinassa de Regny, P. E. (1900a). Radiolaria Miocenici Italiani. Memorie della Reale Accademia della scienze dell'Istituto di Bologna. 5(8): 565-595. gs OReferences:
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Lychnocanoma elongata compiled by the radiolaria@mikrotax project team viewed: 22-7-2026
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