A monotypic genus endemic to southern Australia. Body very elongate, trunk expanded strongly dorsoventrally in adult females, depth much greater than in males; head aligned with body; snout of moderate length, median dorsal snout ridge confluent with supraorbital ridges; opercular ridge straight, crossing half or more of opercles in subadults and adults; STR and STAR discontinuous near rear of dorsal‑fin base; ITR and ITAR continuous; LTR not confluent with tail ridges; eggs brooded in enclosed pouch on underside of tail just behind anal fin; tail not prehensile; dorsal fin much closer to head than tip of tail, with moderately long base; anal fin tiny, below rear half of dorsal fin; caudal fin small, rounded; pectoral fins present.
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