Hannia, Vari 1978: 311

Shelley, James J., Delaval, Aurélien, Le Feuvre, Matthew C., Dempster, Tim, Raadik, Tarmo A. & Swearer, Stephen E., 2020, Revision of the genus Hannia (Teleostei, Terapontidae), with description of a new species, Hannia wintoni, from the Kimberley, Western Australia, Zootaxa 4869 (4), pp. 562-586 : 572-573

Genus. Hannia, Vari 1978: 311

Type species. Hannia greenwayi, Vari 1978 , by original designation

Etymology. The generic name Hannia refers to the type locality of the genus, the Hann River of the Kimberley region of Western Australia.

Diagnosis (modified in part from Vari 1978). An obligate freshwater teraponid genus distinguished from all others in the family by the presence of two spines on the first proximal dorsal pterygiophore, a lack of adult vertical striping, a distinct foramen for the exit of blood vessels from the third hemal arch anterior to the parahypural vertebrae, and by having relatively few (32–38) lateral-line scales.

Description (modified in part from Vari 1978). Body small to medium sized (80–200 mm SL), stout, slightly

compressed laterally, covered with ctenoid scales; dorsal and ventral profiles almost evenly arched; jaws equal; gape oblique; maxillary reaching to vertical through posterior nostril; nostrils wide apart. Teeth in 1–5 bands (usually 4), conical, outer row enlarged; no teeth on vomer or palatines. Lacrimal with 4–6 serrations along posteroventral edge. Postorbital region and opercle scaled; inter-orbital smooth, with bony ridge above orbit; two distinct opercular spines present, lower one the longer and more robust; preopercular spines serrate, longest and most robust on apex of preopercle, reduced in size dorsally and anteriorly; cleithrum exposed, serrate posteriorly, with scales on side; supracleithrum covered by a thin layer of skin.

First (spinous) and second (soft) dorsal fins joined; spinous dorsal arched; 12–14 dorsal spines (usually 13); origin of first dorsal spine slightly anterior to vertical through pelvic fin base; two spines articulating on first proximal dorsal pterygiophore; fifth spine longest, those following decreasing in length gradually to penultimate, which is slightly shorter than ultimate; soft dorsal rounded, 8–11 segmented rays. Pectoral fins asymmetrically pointed, 13–16 segmented rays, fifth or sixth ray longest. Pelvic fins pointed, 1 spine, 5 segmented rays, first or second longest, reaching to anus. Pelvic insertion anterior to vertical through dorsal-fin origin; anal fin with 3 spines, second strongest, 7–9 segmented rays (usually 8). Caudal fin emarginate, 15–17 unbranched (usually 15) and 17 branched rays; vertebrae 25–26 (usually 25); a distinct foramen for the exit of blood vessels from the third hemal arch anterior to the parahypural vertebrae; gill rakers on lower limb 13–16, upper limb 7–10.