Species Diodon nichthemerus

Common name: Globefish

Previous nomenclature: Atopomycterus nichthemerus

Material

Description based on otoliths of two specimens of 237 and 228 mm TL. Otolith catalogue reference DMF1 and DMF44. Catch locality Wilsons Promontory, Victoria, 25 m depth. ID by DMF.

Otolith description

Otolith very small, tall oval. Dorsal margin rounded and irregular; ventral margin rounded to angular and dentate/irregular; posterior margin rounded and irregular. Sulcus groove deep, homosulcoid; opening ostio-caudal. Colliculum homomorph, fused with deep anterior and posterior pits. Collum absent. Crista superior absent; crista inferior ridge-like. Rostrum and antirostrum absent. Dorsal area and ventral area reduced and uneven.

Morphometry

TL = 270.156 OW 0 008 mm n = 8; Std Err Est = 0.076; R = 0.047; P<0.92 Otolith weight range = 0.8-2.7 mg Fish length range = 252-310 mm TL (CMAR)

Distribution and ecology

New South Wales to Western Australia, and Tasmania (Last et al. 1983); rocky reefs and seagrass habitats to 70 m depth; usually solitary, but sometimes found in large groups (Edgar et al. 1982); reaches 400 mm in length (May and Maxwell 1986).

Predator-prey information

Undistinguished species of this Family are known prey of Caspian tern (Sterna caspia) (Higgins and Davies 1996).

Otolith of Diodon nichthemerus from a fish of 237 mm TL
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