This page represents the following TreeOfLife-200M taxonomic path.[1]
Images linked through the available TreeOfLife-200M/GBIF records are museum specimen records, but direct image access from the cited mediaphoto.mnhn.fr URLs failed (HTTP 403) in this environment; therefore, no reliable image-derived morphological description can be added here.
Agastrocyathus is treated in the systematic framework of Archaeocyatha (Cambrian poriferan class-level taxa) in Treatise Online. This group is characterized by nonspiculate calcareous cup skeletons with porous wall architecture and internal interval structures (e.g., septa/pseudosepta/tabulae-like elements), and it is primarily known from the Cambrian.
The Treatise excerpt used here provides the contextual placement within Archaeocyatha, but it does not contain species-/genus-/taxon-specific diagnostic characters establishing a unique morphology, stratigraphic range, or geography for Agastrocyathus itself.
GBIF records Agastrocyathus as an accepted taxon name, authored as Debrenne, 1964, with the publication note: Notes Mém. Serv. Mines Carte Géol. Maroc 179.