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Type: Correspondence
Published: 2021-02-05
Page range: 296–300
Abstract views: 517
PDF downloaded: 18

The Pandemic Blenny, Coralliozetus clausus, a new species of tube blenny endemic to Isla del Coco, Costa Rica (Teleostei: Chaenopsidae)

Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0208, U.S.A.
Pisces Chaenopsidae Coralliozetus tube blennies Isla del Coco Costa Rica island endemic small body size


Coralliozetus clausus, a new species of chaenopsid blenny, endemic to Isla del Coco, Costa Rica, is described. This small species, not exceeding 15 mm SL, is a short-bodied member of the genus along with Coralliozetus cardonae (Caribbean), Coralliozetus angelicus, and Coralliozetus springeri (both eastern Pacific). It differs from its closest relative, C. springeri, known from mainland waters from Costa Rica to Ecuador, in having a single tiny supraorbital cirrus and dark dots on the operculum and branchiostegal membrane of males while C. springeri has paired supraorbital cirri (one of which is substantial in size) and no dots on the operculum. Although two other species of Coralliozetus have been reported from Isla del Coco, this appears to be only member of the genus present on the island. It is the second chaenopsid endemic to Isla del Coco and brings the number of cryptobenthic fishes endemic to Isla del Coco to twelve.



  1. Briggs, J.C. (1955) A monograph of the clingfishes (Order Xenopterygii). Stanford Ichthyological Bulletin, 6, 1–224.

    Bussing, W.A. (1990) New species of gobiid fishes of the genera Lythrypnus, Elacatinus and Chriolepis. Revista de Biología Tropical, 38, 99–118.

    Bussing, W.A. (1991) A new genus and two new species of tripterygiid fishes from Costa Rica. Revista de Biología Tropical, 39, 77–85.

    Bussing, W.A. (1997) Chirolepis atrimelum (Gobiidae) a new species of gobiid fish from Isla del Coco, Costa Rica. Revista de Biología Tropical, 45, 1547–1552.

    Cortés, J. (2012) Marine biodiversity of an eastern tropical Pacific oceanic island, Isla del Coco, Costa Rica. Revista de Biología Tropical, 60 (Suppl. 3), 131–185.

    Dawson, C.E. (1977) Studies of the eastern Pacific sand stargazers (Pisces: Dactyloscopidae). 4. Gillellus, Sindoscopus new genus, and Heteristius with description of new species. Proceedings of the California Academy of Sciences, 41, 125–160.

    Fourriére, M., Alvarado, J.J., Ayala Bocos, A. & Cortés, J. (2017) Updated checklist and analysis of completeness of the marine fish fauna of Isla del Coco, Pacific of Costa Rica. Marine Biodiversity, 47, 813–821.

    Hastings, P.A. (1990) Phylogenetic relationships of tube blennies of the genus Acanthemblemaria (Pisces: Blennioidei). Bulletin of Marine Science, 47, 725–738.

    Hastings, P.A. (1991) The ontogeny of sexual dimorphism in Coralliozetus angelica (Chaenopsidae). Copeia, 1991, 969–978.

    Hastings, P.A. (1997) Phylogenetic relationships of the Coralliozetus clade of chaenopsid blennies, with description of a new genus (Teleostei, Blennioidei). Bulletin of Marine Science, 61, 743–761.

    Hastings, P.A. (2000) Biogeography of the tropical eastern Pacific: Distribution and phylogeny of chaenopsid blennies. Zoological Journal of the Linnean Society, 128, 319–335.

    Hastings, P.A. (2002) Evolution of morphological and behavioral ontogenies in females of a highly dimorphic clade of blennioid fishes. Evolution, 56, 1644–1654.

    Hastings, P.A. & Robertson, D.R. (1999) Acanthemblemaria atrata and Acanthemblemaria mangognatha, new species of eastern Pacific barnacle blennies (Chaenopsidae) from Isla del Coco, Costa Rica, and Islas Revillagigedo, Mexico, and their relationships with other barnacle blennies. Revue Française d’Aquariologie Herpétologie, 25, 107–118.

    Lasso-Alcalá, O., Posada, J., Van Tassell, J., Robertson, D.R. & Fariña, A. (2012) Geographic distribution of twinhorn blenny, Coralliozetus cardonae (Actinopterygii: Perciformes: Chaenopsidae), with new records from the southern Caribbean. Acta Ichthyologica et Piscatoria, 42, 59–64.

    Møller, P.R., Schwarzhans, W. & Nielsen, J.G. (2005) Review of the American Dinematichthyini (Teleostei: Bythitidae). Part II. Ogilbia. Aqua, Journal of Ichthyology and Aquatic Biology, 10, 133–207.

    Robertson, D.R. & Allen G.R. (2015) Shorefishes of the Tropical Eastern Pacific: online information system. Version 2.0. Smithsonian Tropical Research Institute, Balboa. Electronically accessible. Available from: (accessed 15 January 20201)

    Sabaj, M.H. (2019) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference. Version 7.1. 21 March 2019. American Society of Ichthyologists and Herpetologists, Washington, D.C. Electronically accessible. Available from: (accessed 29 June 2020)

    Schultz, L.P. (1944) A revision of the American clingfishes, family Gobiesocidae, with descriptions of new genera and forms. Proceedings of the United States National Museum, 96, 47–77.

    Smith-Vaniz, W.F. & Palacio, F.J. (1974) Atlantic fishes of the genus Acanthemblemaria, with description of three new species and comments on Pacific species (Clinidae: Chaenopsinae). Proceedings of the Academy of Natural Sciences of Philadelphia, 125, 197–224.

    Stephens, J.S. Jr. (1963) A revised classification of the blennioid fishes of the American family Chaenopsidae. University of California Publications in Zoology, 68, 1–165.

    Stephens, J.S. Jr., Hobson, E.S. & Johnson, R.K. (1966) Notes on distribution, behavior, and morphological variation in some chaenopsid fishes from the Tropical Eastern Pacific, with descriptions of two new species, Acanthemblemaria castroi and Coralliozetus springeri. Copeia, 1966, 424–438.