Ypsilon Bullseye, Pempheris ypsilychnus Mooi & Jubb 1996

Ypsilon Bullseye, Pempheris ypsilychnus. Source: Australian National Fish Collection, CSIRO. License: CC BY Attribution-Noncommercial

Cite this page as:
Bray, D.J. 2019, Pempheris ypsilychnus in Fishes of Australia, accessed 17 Jun 2024, https://fishesofaustralia.net.au/home/species/2490

Ypsilon Bullseye, Pempheris ypsilychnus Mooi & Jubb 1996

More Info


Endemic to northern Australia, from Shark Bay, Western Australia, to Moreton Bay, Queensland.


Dorsal fin V-VI, 9-11; Anal fin III, 30-36; Pectoral fin 16-18; Pelvic fin 1, 5; Principal caudal-fin rays 9+8; Lateral-line scales 62-74; Scale rows above lateral line 9-11; Scale rows below lateral line 17-21; Cheek scale rows 6-9; Predorsal scales 35-45; Circumpeduncular scales 22-26; Gill rakers 6-8 + 19-22 = 25-30.

Similar Species

Differs from other species of Pempheris in having the following combination of characters: all scales ctenoid and adherent; pelvic axillary scale present; lateral-line scales 62-74 gill rakers on first arch 6-8 + 19-22 = 25-30; dark, Yshaped light organ visible through body wall between pelvic- and anal-fin origins, with its bifurcation around anus.


The specific name ypsilychnus is a combination of ypsilon, the Greek letter Y, and lychnos, Greek for lamp or light. This combination alludes to the Y -shaped posterior organ that is visible through the body wall and characteristic of this species, reported to be luminescent.

Species Citation

Pempheris ypsilychnus Mooi & Jubb 1996, Records of the Australian Museum 48(2): 123, figs 4b, 7-8. Type locality: Broome, Western Australia.


Bray, D.J. 2019


Atlas of Living Australia

Ypsilon Bullseye, Pempheris ypsilychnus Mooi & Jubb 1996


Hutchins, J.B. 1994. A survey of the nearshore reef fish fauna of Western Australia's west and south coasts — The Leeuwin Province. Records of the Western Australian Museum, Supplement 46: 1-66 figs 1-6 

Hutchins, J.B. 2001. Biodiversity of shallow reef fish assemblages in Western Australia using a rapid censusing technique. Records of the Western Australian Museum 20: 247-270 

Johnson, J.W. 2010. Fishes of the Moreton Bay Marine Park and adjacent continental shelf waters, Queensland, Australia. pp. 299-353 in Davie, P.J.F. & Phillips, J.A. Proceedings of the Thirteenth International Marine Biological Workshop, The Marine Fauna and Flora of Moreton Bay. Memoirs of the Queensland Museum 54(3) 

Jubb, R.N. 1977. A revision of the Australian fishes of the family Pempheridae (Pisces: Perciformes). Unpublished B.A Honours thesis, School of Biological Sciences, Macquarie University, North Ryde, N.S.W, pp. 62 + 4 tabs. + 14 figs. 

Mooi, R.D. &. Jubb, R.N. 1996. Descriptions of two new species of the genus Pempheris (Pisces: Pempheridae) from Australia, with a provisional key to Australian species. Records of the Australian Museum 48(2): 117-130 DOI: 10.3853/j.0067-1975.48.1996.284, Open access

Quick Facts

CAAB Code:37357007


Depth:1-25 m

Habitat:Reef associated

Max Size:12 cm SL

Species Image Gallery

Species Maps

CAAB distribution map