A rare species . Viviparous . All four male specimens with developed reproductive organ indicating internal fertilization, and a tentatively referred specimen is a female with distended, 15 mm long ovaries containing large eggs (0.7 mm) . A ripe female with eggs (ca. 1 mm diameter), caught in Hunter Commonwealth Marine Reserve, NSW, is the largest known specimen .
Dorsal soft rays (total): 75 - 81; Anal soft rays: 53 - 56; Vertebrae: 68 - 71. This species is distinguished from is congeners by the following characters: first gill arch with 3-4 developed gill rakers; D 75-81; precaudal vertebrae 31-32; anal fin origin below vertebrae 32-36. Colouration: black pigmentation laterally in the roof of the mouth, very distinct from the outside as a black area half the head length between the eye and the upper jaw .Cross section: compressed.
Behavioural data for Paraphyonus Rassi is currently being reviewed.
Diet information for Paraphyonus Rassi is currently being compiled.
Reproduction data for Paraphyonus Rassi is currently being compiled.
Marine; bathydemersal; depth range 2610 - 4440 m . Deep-water West and East Central Atlantic: Sargasso Sea and the Caribbean Sea.
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