Amphigeisina Bengtson, 1976

Kouchinsky, Artem, Bengtson, Stefan, Clausen, Sébastien & Vendrasco, Michael J., 2015, An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia, Acta Palaeontologica Polonica 60 (2), pp. 421-512 : 476

Genus Amphigeisina Bengtson, 1976

Type species: Hertzina? danica Poulsen, 1966 ; lower middle Cambri- an; Bornholm.

Remarks.— By contrast with other species of “protoconodonts” herein (see also Kouchinsky et al. 2011), Amphigeisina danica does not exhibit longitudinal fibrous microstructure of the type available in grasping spines of chaetognaths (e.g., Vannier et al. 2007).