Gibbosa Crassatella Shell, Hybolophus gibbbosa

Gibbosa Crassatella Shell, Hybolophus gibbosa. Shell collected within Magdalena Bay, Baja California Sur, October 2019. Size: 5.7 cm (2.2 inches) x 1.5 cm (0.6 inches). Size: 5.2 cm (2.0 inches) x 3.9 cm (1.5 inches).

The Gibbosa Crassitella, Hybolophus gibbosa (G.B. Sowerby I, 1832), is a bivalve mollusk that is member of the Crassatellidae Family of Crassatella. The shell is wedge-shaped, with a widely rounded anterior end and a more narrowly rounded posterior end. They have thick hinges and the outside of the shell is marked by fine concentric lines. The shell has a buffy yellow to orange brown exterior but the shell is normally covered by a dark brown periostracum. The interior is white with brown toward the posterior end. Gibbosa Crassitella reach a maximum of 9.3 cm (3.7 inches) in length and 7.0 cm (2.7 inches) in height.

Gibbosa Crassitella Shells are found over and within sandy or mud substrate at depths between 5 m (15 feet) and 140 m (360 feet). They are found from Bahia San Juanico, Baja California Sur to Peru, and throughout the Sea of Cortez.

Synonyms include Crassatellites rudis, Eucrassatella aequatorialis, Eucrassatella gibbosa, and Eucrassatella manabiensis.