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Hexasaturnalis nakasekoi nov. sp., a Jurassic saturnalid radiolarian species frequently confounded with Hexasaturnalis suboblongus (Yao)
Authors:Paulian Dumitrica  Ruth Dumitrica-Jud
Affiliation:a Dennigkofenweg 33, 3073 Gümligen, Switzerland
b Institut de Géologie et Paléontologie, UNIL, 1015 Lausanne, Switzerland
Abstract:
Detailed morphological study of the ring of the Jurassic saturnalid radiolarian species frequently cited in the literature as Hexasaturnalis suboblongus (Yao) has proven that it contains two well-defined species: H. suboblongus (Yao), practically ranging within the boundaries of the Bajocian, and Hexasaturnalis nakasekoi nov. sp., ranging within the Bathonian-Kimmeridgian interval. The two species seem to be important stratigraphically because the transition from the former to the latter took place at or around the Bajocian/Bathonian boundary. The phyletic lineage Hexasaturnalis hexagonus (Yao) → H. inuyamaensis (Yao) → H. suboblongus (Yao) → H. nakasekoi nov. sp. → H. minor (Baumgartner) → Dicerosaturnalis angustus (Baumgartner) → D. dicranacanthos (Squinabol) is proposed.
Keywords:Jurassic   Radiolaria   Saturnalidae   New species   Systematics   Phylogeny
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