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Roa semilunaris Matsunuma & Motomura, 2022 Half-moon barred butterflyfish |
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photo by
National Museum of Nature and Science, Japan |
| Family: | Chaetodontidae (Butterflyfishes) | |||
| Max. size: | 11.03 cm SL (male/unsexed) | |||
| Environment: | reef-associated; marine; depth range 102 - 123 m | |||
| Distribution: | Western Indian Ocean: Saya de Malha Bank. High Seas only. | |||
| Diagnosis: | Dorsal spines (total): 11-12; Dorsal soft rays (total): 20-21; Anal spines: 3-3; Anal soft rays: 16-17; Vertebrae: 24-24. This species is distinguished from its congeners by the following set of characters: pored lateral-line scales 37-41; black blotch present on each membrane associated with first and second dorsal-fin spines; upper jaw is covered with scales; pelvic-fin spine and distal portion of 1st soft ray are whitish, while remaining portions of fin dusky to black; second black body band crossing pectoral-fin base, and is interrupted by many pale narrow lines; ocellated blotch on the dorsal-fin soft-rayed portion semicircular or oval, with long axis/short axis ratio 1.6-2.0 (Ref. 126057). | |||
| Biology: | ||||
| IUCN Red List Status: | Not Evaluated (N.E.) Ref. (130435) | |||
| Threat to humans: | harmless | |||