Superfamily ARTOSTROBIOIDEA Riedel, 1967

Artostrobiidae Riedel, 1967a: 148; 1967b: 296; 1971: 657.

Artostrobiaceae [sic] – O’Dogherty 1994: 158 (= Artostrobioidea) [as a superfamily].

Artostrobioidea – Matsuzaki et al. 2015: 55.

DIAGNOSIS. — The shell is tubular or with a highly angled, conical shape. They consist of two or three segments. Some members have a subsequent undulated thorax whose segmentations are not marked by inner-ring dividers.

REMARKS

The higher taxonomic position of this superfamily is based on Botryostrobus (Artostrobiidae) and Spirocyrtis (Artostrobiidae) . In Sandin et al. (2019), Ectotoxon (= misspelled Extotoxon originally, Stichopiliidae) was grouped with both previous mentioned genera, but this was owed to a misidentification based on supplemental photos. Thus, this superfamily consists of the Artostrobiidae Riedel 1967a and the Rhopalosyringiidae Empson-Morin 1981 in the Cenozoic. The Artostrobioidea are highly abundance in environmental sequences from deep waters (Sandin et al. 2019).