Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Acanthuridae
(Surgeonfishes, tangs, unicornfishes) > Acanthurinae
Etymology: Acanthurus: Greek, akantha = thorn + Greek, oura = tail (Ref. 45335); reversus: Named in reference to the reversal of the color pattern of the caudal fin compared to that of A. olivaceus, its closest relative. More on authors: Randall & Earle.
Environment: milieu / climate zone / depth range / distribution range
Marine; reef-associated; depth range 4 - 15 m (Ref. 41630). Tropical
Eastern Central Pacific: Marquesas Islands.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 34.0 cm TL male/unsexed; (Ref. 89972)
Morphology | Morphometrics
soft rays: 23 - 24. Caudal concavity 3.35-4.7 in SL; brown in life, the posterior half of body sometimes abruptly paler, with an elongate orange spot extending posteriorly from upper end of gill opening, the posterior half enclosed by a broad, deep blue band that extends beyond tip of pectoral fin; dorsal and anal fin base with a faint orange line, the soft portion of the dorsal with three dark longitudinal bands on outer one-half of fin, the anal fin with a narrow blue margin; caudal fin pale yellow with a broad black posterior border that narrows as it extends onto elongate lobes of fin; outer one-third of pectoral fins abruptly white; juveniles bright yellow with blue margins on dorsal and anal fins (Ref. 41630).
Found inshore (Ref. 41630). Feeds on filamentous algae (Ref. 89972).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Randall, J.E. and J.L. Earle, 1999. Acantharus reversus, a new species of surgeonfish (Perciformes: Acanthuridae) from the Marquesas Islands. Proc. Calif. Acad. Sci. 51(14):473-481. (Ref. 41630)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 27.5 - 29, mean 28 (based on 106 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02399 (0.01124 - 0.05120), b=2.96 (2.79 - 3.13), in cm Total Length, based on LWR estimates for this Genus-body shape (Ref. 93245
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (30 of 100) .