Hipposcarus longiceps or Pacific longnose parrotfish is a species of marine ray-finned fish, a parrotfish in the family Scaridae. It is found in the eastern Indian Oceans and the western Pacific Ocean from the Cocos-Keeling Islands and Rowley Shoals in the eastern Indian Ocean to the Line and Tuamotu islands in the east, north to the Ryukyu Islands, south to the Great Barrier Reef and New Caledonia.[2]

Hipposcarus longiceps was first formally described as Scarus longiceps in 1840 by the French ichthyologist Achille Valenciennes (1794–1865) with the type locality given as Waigeo in modern Indonesia.[3]

The Hipposcarus longiceps exhibits distinct ontogenetic changes in otolith morphology, with younger individuals having more rounded otoliths and older individuals displaying elongated, lobed structures. These morphological differences are useful for species identification and understanding growth stages within parrotfish taxonomy. (Jawad, L.A, 2018)

Additionally, the Hipposcarus longiceps exhibits diandric hermaphroditism, meaning some individuals mature as males from birth, while others transition from female to male later in life (Moore, 2022).

The species is on the IUCN Red List as Least Concern, from the assessment year 2012.[1]

References

  1. ^ a b Choat, J.H.; Carpenter, K.E.; Clements, K.D.; Rocha, L.A.; Russell, B.; Myers, R.; Lazuardi, M.E.; Muljadi, A.; Pardede, S.; Rahardjo, P. (2012). "Hipposcarus longiceps". IUCN Red List of Threatened Species. 2012: e.T190745A17786312. doi:10.2305/IUCN.UK.2012.RLTS.T190745A17786312.en. Retrieved 20 November 2021.
  2. ^ a b Froese, Rainer; Pauly, Daniel (eds.). "Hipposcarus longiceps". FishBase. December 2019 version.
  3. ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Scarus longiceps". Catalog of Fishes. California Academy of Sciences. Retrieved 10 February 2020.

Jawad, L. A. (2018). A comparative morphological investigation of otoliths of six parrotfish species (Scaridae) from the Solomon Islands. Journal of Fish Biology., 93(6), 1046–1058. https://doi.org/10.1111/jfb.13787

Moore, B. R. (2022). Age‐based life history of Pacific longnose parrotfish Hipposcarus longiceps from New Caledonia. Journal of Fish Biology., 100(4), 997–1008. https://doi.org/10.1111/jfb.15004


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