Species Paramonacanthus filicauda

Common name: Threadfin leatherjacket Previous nomenclature: Arotrolepis filicauda

Material

Description based on otoliths of one specimen of 111 mm TL. Otolith catalogue reference DMF1. Catch locality Disaster Bay, New South Wales, 25 m depth. ID by DMF.

Otolith description

Otolith very small, hour-glass shaped. Dorsal margin flat, but angled and entire to slightly irregular; ventral margin rounded and irregular; posterior margin deeply notched and entire to slightly irregular. Distal surface flat; proximal surface irregular. Sulcus groove deep, homosulcoid; opening ostio-caudal. Colliculum indistinct. Collum bridge-like. Crista superior well developed and diagonal over ostium and cauda, but absent at neck; crista inferior ridge-like and broad, extending onto rostrum and pseudo-rostrum. Rostrum

Otolith of Paramonacanthus filicauda from a fish of 111 mm TL

broad and blunt with deep notch. Antirostrum small broad and rounded. Excisura and pseudo-excisura wide; notch deep; angle wide. Dorsal area reduced. Ventral area groove present with minimal sculpturing, follows line of ventral margin.

Morphometry

No data are available.

Distribution and ecology

Typically demersal, northern Australian tropical waters, but occassionally found in east-coast temperate waters (Gomon et al. 1994); reaches 220 mm in length.

Predator-prey information

None cited.

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