- Type images:
type material: S. praecorona
From Suzuki Paleotax db:
1977 Siphostichartus praecorona n. sp. Nigrini p. 258, pl. 2, figs. 8, 9
1981 Siphostichartus praecorona Nigrini De Wever pl. 4, fig. 4
1984 Siphostichartus praecorona Nigrini Nigrini & Lombari N195-N196, pl. 32, figs. 5a, 5b
1986 Siphostichoartus praecorona Nigrini Levyikina p. 87, pl. 6, figs. 9, 10
1986 Siphostichoartus praecorona Nigrini Riedel & Sanfilippo pl. 5, figs. 8, 9
1988 Siphostichartus praecorona Nigrini Suyari & Yamasaki pl. 6, fig. 9
Catalog entries: Siphostichartus praecorona
type material: S. praecoronaOriginal description: Four-segmented form with a smooth, thin-walled shell. Cephalis small, hemispherical, with a few small circular pores; short, apical horn may be present; vertical tube generally short, cylindrical, but forms transitional between S. praecorona and S. corona have a well-developed, but not flamboyant, duck-billed tube. Thorax inflated, slightly heavier than rest of shell with three transverse rows of circular pores. Abdomen may appear as a "neck" on the fourth segment or may be a discrete, but short segment with two or, as the form approaches S. corona, three or four transverse rows of circular pores. Termination ragged.
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:
Nigrini, C. A. (1977). Tropical Cenozoic Artostrobiidae (Radiolaria). Micropaleontology. 23(3): 241-269. gsReferences:
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Siphostichartus praecorona compiled by the radiolaria@mikrotax project team viewed: 14-10-2024
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