Bivalvia - Pholadomyida - Megadesmidae

Alternative combinations: Cleobis grandis, Maeonia grandis, Megadesmus grandis

Synonyms: Cleobis gracilis Dana 1847, Maeonia gigas M'Coy 1847, Maeonia gracilis Dana 1847, Pachydomus gigas M'Coy 1847

Full reference: J. D. Dana. 1847. Descriptions of fossil shells of the collections of the exploring expedition under the command of Charles Wilkes, USN, obtained in Australia, from the lower layers of the coal formation in Illawarra, and from a deposit probably of nearly the same age at Harper's Hill, Valley of the Hunter. American Journal of Science and Arts, Second Series 4:151-160

Belongs to Megadesmus (Cleobis) according to J. B. Waterhouse 1988

See also Clarke 1973, Dana 1847, Dana 1849, Laseron 1910, M'Coy 1847, Reed 1936, Runnegar 1965 and Waterhouse 1983

Sister taxa: Megadesmus (Megadesmus), Megadesmus borealis, Megadesmus deflatus, Megadesmus dembskajae, Megadesmus globlosus, Megadesmus globosus, Megadesmus gryphoides, Megadesmus nobilissimus, Megadesmus ovalis, Megadesmus pristinus, Megadesmus robusta, Megadesmus trigonalis, Megadesmus (Cleobis) recta

Type specimens:

• Megadesmus (Cleobis) grandis: USNM 3638. Its type locality is Wollongong Point, Illawarra (USNM coll), which is in a Wordian coastal siliciclastic in the Gerringong Formation of Australia.
• Cleobis gracilis: USNM 3637. Its type locality is Wollongong Point, Illawarra (USNM coll), which is in a Wordian coastal siliciclastic in the Gerringong Formation of Australia.
• Pachydomus gigas: Its type locality is Wollongong (W.B. Clarke coll), which is in a Wordian marine sandstone in the Gerringong Formation of Australia.

Distribution:

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Specimen images are retrieved through the ePANDDA API.