cmc:IP 37404 Hyperoblastus sp.

Biological Specimen ID: 000490273

Object Type Biological Specimen

Organization CMC Vertebrate Paleontology Department

Number of media representing object 28

GENERAL DETAILS

Specimen ID

000490273

Vouchered

Yes

Description

Brooding of young is a reproductive strategy observed in many extant echinoderms, but the evolutionary history of this behaviour is largely unknown due to the scarcity of examples preserved in the fossil record. Synchrotron X-ray tomography is used to describe an exceptionally preserved specimen of the Devonian blastoid echinoderm Hyperoblastus reimanni. The coelomic cavity appears completely preserved in a coiled arrangement partially enclosing organs associated with the digestive, haemal and axial systems. The vault region of the coelom surrounds four structures interpreted as three internally brooded larvae and a gonad. The presence of putative larvae brooded internally in this specimen sheds new light on the reproductive strategies employed by blastoids, suggesting they were sexually dimorphic and that internal brooding was acquired early in the group’s history. The acquisition of brooding may have been linked to high clastic sediment influx associated with the Appalachian Orogeny, which would have been detrimental to the survival of larvae living at the soupy sediment–water interface.

Sex

Female

Is type specimen

External repository source

Date uploaded

December 23, 2022

Organization

CMC Vertebrate Paleontology Department

Object collector

Specimen Measurements