A temperate species occurring in a wide range of habitats and depths from estuaries (< 40 m) to the continental slope (ca. 100-600 m), but most common in outer shelf and upper slope waters . Minimum depth reported taken from Ref. 57178.
Dorsal spines (total): 10; Dorsal soft rays (total): 10; Anal spines: 3; Anal soft rays: 7. This species is distinguished from its congeners by the following set of characters: lower jaw with a row of conical teeth posterior to a canine tooth near symphysis; presence of basioccipital fossa; proximal-middle radial of first anal-fin pterygiophore with a narrow and elongate concavity on anterior surface; pectoral-fin rays 14; first gill arch with gill rakers on lower arm 20-23; lateral-line scales 44-51; body depth 22.2-28.1% SL; scales cycloid and very weakly ctenoid .Cross section: compressed.
Behavioural data for Threespine cardinalfish is currently being reviewed.
Marine; brackish; demersal; depth range 0 - 600 m , usually 100 - 400 m . Subtropical; 24°S - 44°S, 113°E - 155°E Endemic to Australia.
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