Fauna and ecology of the holothurian bed, Llandrindod, Wales, UK (Darriwilian, Middle Ordovician), and the oldest articulated holothurian

Oesolcucumaria eostre from the late Darriwilian Holothurian Bed of Wales is the oldest articulated holothurian used here, and its calcareous ring provides an unequivocal class assignment; a disputed Cambrian PBDB identification is not used as the range endpoint.

Oesolcucumaria eostre is assigned to Holothuroidea in the cited systematic study by articulated anatomy including a diagnostic calcareous ring; disputed Cambrian material is not used as an equivalent class record.

The cited articulated Oesolcucumaria record is from the late Darriwilian Holothurian Bed at Llandrindod, Wales; it does not establish global holothurian distribution or an origin centre.

The articulated Holothurian Bed record does not establish class-wide diet, habitat preference, locomotor performance, body-size distribution or guild for Holothuroidea; the profile retains only its marine depositional context.

Oesolcucumaria eostre preserves an articulated body and diagnostic calcareous ring in the cited Holothurian Bed material; these observations remain specimen- and locality-bounded.