[Ichthyology • 2024] Halichoeres sanchezi • A New Wrasse (Teleostei: Labridae) from the Revillagigedo Archipelago of Mexico, tropical eastern Pacific Ocean

Halichoeres sanchezi 

Victor​, Frable & Ludt, 2024

 DOI: 10.7717/peerj.16828

Photos: Allison Morgan Estape.

Abstract 

A new labrid fish species, Halichoeres sanchezi n. sp., is described from eight specimens collected in the Revillagigedo Archipelago in the tropical eastern Pacific Ocean, off the coast of Mexico. The new species belongs to the Halichoeres melanotis species complex that is found throughout the region, differing by 2.4% in the mtDNA cytochrome c oxidase I sequence from its nearest relative, H. melanotis from Panama, and 2.9% from Halichoeres salmofasciatus from Cocos Island, off Costa Rica. The complex is distinguished from others in the region by having a black spot on the opercular flap and a prominent black area on the caudal fin of males. The juveniles and initial phase of the new species closely resemble those of H. salmofasciatus and Halichoeres malpelo from Malpelo Island of Colombia, differing in having an oblong black spot with a yellow dorsal margin on the mid-dorsal fin of initial-phase adults as well as on juveniles. In contrast, the terminal-phase male color pattern is distinct from other relatives, being vermilion to orangish brown with dark scale outlines, a white patch on the upper abdomen, and a prominent black band covering the posterior caudal peduncle and base of the caudal fin. The new species adds to the list of endemic fish species for the isolated archipelago and is an interesting case of island endemism in the region. The discovery was made during the joint 2022 collecting expedition to the archipelago, which featured a pioneering collaborative approach to an inventory of an island ichthyofauna, specifically including expert underwater photographers systematically documenting specimens in situ, before hand-collection, and then photographed fresh, tissue-sampled, and subsequently vouchered in museum collections.

Halichoeres sanchezi n. sp., juvenile and Initial-phase adults underwater, San Benedicto, Revillagigedo Archipelago, Colima, Mexico.
(A) Small juvenile. Photo credit: Allison Morgan Estape (B) Large juvenile. Photo credit: Jeff Haines. (C) Initial-phase adult.

Photos: Allison Morgan Estape.

Halichoeres sanchezi n. sp., first known underwater photographs, from Socorro, Revillagigedo Archipelago in 2013.
(A) Small Initial-phase. (B) Initial-phase adult.
(C) Two Terminal-phase males.

Photos: Kreg Martin.

 

Benjamin C. Victor​, Benjamin W. Frable and William B. Ludt. 2024. Halichoeres sanchezi n. sp., A New Wrasse from the Revillagigedo Archipelago of Mexico, tropical eastern Pacific Ocean (Teleostei: Labridae) PeerJ. 12: e16828. DOI: 10.7717/peerj.16828

[Ichthyology • 2023] Paracheilinus amanda • Review of Australian Species of Paracheilinus Fourmanoir (Teleostei: Labridae), with Description of A New Species from the Great Barrier Reef and Coral Sea

 (A1-A2) Paracheilinus amanda, new species;
(B) P. carpenteri, (C) P. flavianalis,
(D) P. mccoskeri, (E) P. rubricaudalis. 

in Tea & Walsh. 2023.

 DOI: 10.1643/i2023019

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Photographs by H. H. Tan (A1); T. Yamazumi (A2); T. Cameron (B); V. Chalias (C); T. Kawamoto (D); and N. DeLoach (E).

Abstract

Australian species of the cirrhilabrin labrid genus Paracheilinus are reviewed. Four species of Paracheilinus are reported from Australian waters: P. amanda, new species, from Flora, Holmes, and Osprey Reefs, Coral Sea, off northeast Queensland, and Harrier Reef, Great Barrier Reef; P. filamentosus from Lizard Island, Great Barrier Reef; P. flavianalis from Evans and Flinders Shoals, Timor Sea, off northeast Darwin, Northern Territory, and Ashmore, Scott, Seringapatam, and Hibernia Reefs in the north-western shelf of Western Australia; and P. nursalim from Flinders Shoal, Timor Sea, off northern Darwin, Northern Territory. Paracheilinus amanda, new species, has previously been confused for P. rubricaudalis from Melanesia, but molecular analysis of mitochondrial COI recovers both species as reciprocally monophyletic lineages, differing from each other by 1–1.2% in genetic distance. They further differ in aspects of live coloration of terminal phase (TP) males. Both species are allopatric and do not overlap in distribution. The new species is described on the basis of six specimens: the holotype and two paratypes from Harrier Reef, Great Barrier Reef, one paratype from Flora Reef, Coral Sea, and from two paratypes collected off Hula in southern Papua New Guinea, along the north-western margin of the Coral Sea. The discovery of P. nursalim in Australia represents a new and significant range extension from previous locality records of West Papua and Ambon Bay. Paracheilinus is rediagnosed, and keys, diagnoses, photographs, and Australian distribution records are presented for all species herein. 

Paracheilinus amanda, new species, aquarium specimen from Harrier Reef, the Great Barrier Reef. Specimen not retained. Photograph by K. Endoh.

A selection of Paracheilinus in life.
 (A1) Paracheilinus amanda, new species, ZRC 64175, male paratype, 47.6 mm SL, off Hula, southern Papua New Guinea, Coral Sea; (A2) P. amanda, new species, underwater photograph from Osprey Reef, Coral Sea;
(B) P. carpenteri, underwater photograph from Mabini, Batangas, Philippines. Note the darkened posterior dorsal- and caudal-fin bases and the presence of a second stripe behind the pectoral fin; (C) P. flavianalis, underwater photograph from Bali, Indonesia;
(D) P. mccoskeri, underwater photograph from Khao Lak, Thailand; (E) P. rubricaudalis, underwater photograph from Mborokua, Solomon Islands. Note the reduced markings on caudal fin.

Photographs by H. H. Tan (A1); T. Yamazumi (A2); T. Cameron (B); V. Chalias (C); T. Kawamoto (D); and N. DeLoach (E).

Paracheilinus filamentosus, images of live and preserved specimens.
(A) Male in resting colors, underwater photograph from Guadalcanal, Solomon Islands; (B) flashing male in nuptial colors, underwater photograph from Nggatokae, western Solomon Islands; (C) flashing male in nuptial colors, underwater photograph from the Solomon Islands; (D) AMS I.17479-001, 51.7 mm SL, male paratype, Tassafaronga Point, Guadalcanal, Solomon Islands. Note purple spines and rays in preservation; (E) harem comprising one TP male (middle) and several females and immature males, underwater photograph from Lovukol, central Solomon Islands.

Photographs by M. Rosenstein (A–C, E) and Y. K. Tea (D).

Select individuals of Paracheilinus flavianalis demonstrating variability in the number of dorsal-fin filaments, coloration of anal fin, and spot band pattern on the anal fin.
(A) Underwater photograph from Triton Bay, Indonesia; (B) underwater photograph from Wakatobi, Sulawesi, Indonesia; (C–D) underwater photographs from Bali, Indonesia.

Photographs by R. Smith (A); J. Castellano (B); W. Osborn (C); and R. H. Kuiter (D).

Yi-Kai Tea and Fenton Walsh. 2023. Review of Australian Species of Paracheilinus Fourmanoir (Teleostei: Labridae), with Description of A New Species from the Great Barrier Reef and Coral Sea. Ichthyology & Herpetology. 111(3); 397-415. DOI: 10.1643/i2023019 

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[Ichthyology • 2023] Iniistius bakunawa • A New Species of Razor Wrasse (Teleostei: Labridae) from the Philippines and Western Australia

Iniistius bakunawa

 Sorgon, Tea, Meren & Nañola, 2023

 RAFFLES BULLETIN OF ZOOLOGY. 71 

Eclipse-spot Razor Wrasse  ||  twitter.com/FishGuyKai

Abstract. 

Iniistius bakunawa, new species, is described on the basis of nine specimens consisting of the holotype and six paratypes collected from fish markets in the islands of Panay, Cebu, Bohol, and Jolo in the Philippines, and two paratypes from the Dampier Archipelago, Western Australia. The new species is distinctive in having a pale yellowish to jade green body with a large concentric black and white ellipsoid ocellus on the posteriormost edge of its dorsal fin. Aside from live colouration details, the new species is readily diagnosed from congeners in having the following combination of characters: 7 horizontal rows of scales on cheek; gill rakers 4–6 + 8–11 = 12–17; gill rakers short, bearing teeth; and tubed lateral line scales 23–26. Assignment of the new species to the genus Iniistius is accompanied with a brief discussion of the currently inadequate diagnosis of the genus from Xyrichtys.

Key words. coral reefs, fish markets, Labridae, Novaculini, taxonomy, systematics 

Iniistius bakunawa, new species, KAUM-I. 80684, paratype, 172.0 mm SL, Panay Island, Philippines. Freshly dead specimen showing colouration in life

 Photograph by H. Motomura 

Iniistius bakunawa, new species, A–C, freshly dead specimens showing colouration in life; and D–F, X-rays.
A, USNM 435404, paratype, 162.4 mm SL, Cebu Island, Philippines; B, USNM 437745, paratype, 155.1 mm SL, Panay Island, Philippines; C, USNM 437747, paratype, 158.8 mm SL, Panay Island, Philippines;
D, CSIRO H 1488-1, paratype, 129.8 mm SL, off northwest Dampier Archipelago, Western Australia; E, CSIRO H 1506-1, paratype, 144.5 mm SL, off northern Dampier Archipelago, Western Australia; F, KAUM-I. 80684, paratype, 172.0 mm SL, Panay Island, Philippines.

Photographs by J.T. Williams. X-rays provided by K. Parkinson.

Iniistius bakunawa, new species 

Eclipse-spot Razor Wrasse

Iniistius sp. (Fukui, 2017): 184 (colour photograph of specimen from Panay Island, Philippines [reproduced here in Fig. 1A; KAUM-I. 80684]).

Diagnosis. A species of Iniistius distinct from all congeners based on the following combination of characters and live colouration details: 7 horizontal rows of scales on cheek; gill rakers 4–6 + 8–11 = 12–17; gill rakers short, bearing teeth; pored lateral line scales 19–20 + 4–6 = 23–26; 2 scales dorsoanteriorly on opercle; body yellowish to jade green; posteriormost dorsal fin with a large black centred white ellipsoid ocellus.

Etymology. The specific epithet is given after Bakunawa, a serpentine or draconic figure in Visayan mythology believed to be responsible for causing an eclipse by devouring the moon. The common name is given after the black centred white ellipsoidal ocellus on the posterior dorsal fin. The name bakunawa is treated as a noun in apposition. 

Species of Iniistius are known by a variety of common names, including razor wrasse, cleaver wrasse, and razorfish. The first two names are sometimes used for other novaculin species in the genera Novaculops and Xyrichtys, whereas razorfish is sometimes used for Centriscus and Aeoliscus (Sygnathiformes; Centriscidae; also known as shrimpfish). To maintain consistent terminology with other members of the Novaculini and to avoid confusion with the Centriscidae, we recommend razor wrasse as the preferred common name when referring to species in the genus Iniistius.

 

Kent Elson S. Sorgon, Yi-Kai Tea, Jasmin C. Meren and Cleto L. Nañola Jr. 2023. Iniistius bakunawa, A New Species of Razor Wrasse (Teleostei: Labridae) from the Philippines and Western Australia. RAFFLES BULLETIN OF ZOOLOGY. 71; 511–519.

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