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Diagnostic Description

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Diagnosis: Dorsal rays VIII,13. Anal rays III,11, the first spine, when detectable is very slender and short. Pectoral rays 15-16 (usually 15). Lateral line scales 26-27. Head naked, except for a small patch of scales dorsally on opercle. Gill rakers 20-23. Body depth 5.9-3.6 in SL; head length (HL) 3.1-3.4 in SL; snout length 8.4-9.8 in SL; caudal peduncle depth 6.2-6.65 in SL; pectoral fins 4.0-4.3 in SL; pelvic fins 6.3-6.9 in SL. The caudal fin is truncate in young individuals, becoming strongly lunate with filamentous lobes in adult males. The initial phase is white with postorbital head and anterior body above pectoral-fin base black with an oblique yellow band above dorsal edge of opercle, a black bar over last 4 or 5 dorsal spines continuing ventrally across body, its posterior edge vertical, and a broader black bar over last 9 soft rays of dorsal fin, across the body, and posterior anal fin; a black spot on first 2 membranes of dorsal fin; the terminal males with yellow partly replacing the white, a salmon pink patch on chin, and blue ventrally on head and chest (Ref. 57555).
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Recorder
Estelita Emily Capuli
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Life Cycle

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Oviparous, distinct pairing during breeding (Ref. 205).
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Susan M. Luna
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Morphology

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Dorsal spines (total): 8; Dorsal soft rays (total): 13; Analspines: 3; Analsoft rays: 11; Vertebrae: 25
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Biology

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Found solitary or in groups, most commonly on outer reef areas, and also found in coastal reefs, lagoons and tide pools (Ref. 57555, 90102).
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Black-barred wrasse

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The black-barred wrasse (Thalassoma nigrofasciatum) is a species of ray-finned fish, a wrasse from the family Labridae which is native to the southwestern Pacific Ocean.

Description

In the black-barred wrasse the adults are blackish above and have the ventral half of the head, chest and belly white. There is a short white to yellow vertical stripe which starts above the pectoral-fin base, a further two broad white to yellow stripes are on the flanks and they have a yellow tail. In females, the pale areas are largely white, while in the males the pale areas are more yellow. The males also have a pale pink chin and long, thin filaments on the lobes of the caudal fin[2] and pink patches on the ventral parts of the head and chest. Males have been measured at standard length of 20 centimetres (7.9 in).[3] This species is frequently confused with the similar Jansen's wrasse (Thalassoma janseni).[2]

Distribution

The black-barred wrasse is found in the south western Pacific Ocean from eastern Papua New Guinea and the Solomon Islands south to the Great Barrier Reef, Lord Howe Island and Norfolk Island, the Kermadec Islands, New Caledonia and Tonga, it has also been recorded in Niue.[1]

Habitat and biology

The black-barred wrasse occurs in tidal pools and reefs, both inner and outer reefs, between 0 to 15 metres (0 to 49 ft).[1] It can occur solitarily or in small groups.[2]

Taxonomy

The black-barred wrasse was only described in 2003, it is closely related to Jansen's wrasse and the two species may be easily confused. Many of their molecular characteristics are the same but they do differ in a single nucleotide of the cytochrome b sequence. Despite being morphologicallu almost identical, they are each most probably separate and valid species and there may have been confusion over identification in previously stated distributions.[1]

References

  1. ^ a b c d Cabanban, A.; Pollard, D. (2010). "Thalassoma nigrofasciatum". IUCN Red List of Threatened Species. 2010: e.T187693A8602861. doi:10.2305/IUCN.UK.2010-4.RLTS.T187693A8602861.en. Retrieved 20 November 2021.
  2. ^ a b c Dianne J. Bray. "Thalassoma nigrofasciatum". Fishes of Australia. Museums Victoria. Retrieved 1 Feb 2020.
  3. ^ Froese, Rainer; Pauly, Daniel (eds.) (2019). "Thalossoma nigrofasciatum" in FishBase. August 2019 version.
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Black-barred wrasse: Brief Summary

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The black-barred wrasse (Thalassoma nigrofasciatum) is a species of ray-finned fish, a wrasse from the family Labridae which is native to the southwestern Pacific Ocean.

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