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David A Ebert - One of the best experts on this subject based on the ideXlab platform.
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Redescription of the bigeye chimaera, Hydrolagus macrophthalmus de Buen, 1959 (Chondrichthyes: Chimaeriformes), with a genetic characterization of the species
Marine Biodiversity, 2019Co-Authors: David A Ebert, Jenny M. Kemper, Kristin Walovich, Kimberly L. QuarantaAbstract:Hydrolagus macrophthalmus de Buen, 1959 is a little known chimaerid species from the southeastern Pacific Ocean. At the time of its description, it was the only chimaeroid species known from the region; however, there now are four other Hydrolagus species known from the area. Hydrolagus macrophthalmus is distinct from other species in the area based on the following characters: an undulated second dorsal fin with peaks on the anterior and posterior regions, a long curved first dorsal fin spine that extends past the origin of the second dorsal fin when laid flat, and uniform dark brown color with a light spot on middle of the second dorsal fin that extends onto the body below it. Genetic sequencing of the NADH2 gene was used to distinguish H. macrophthalmus from other known species in the region. This species is herein re-described and compared to four sympatric species: H. alphus , H. melanophasma , H. mccoskeri , and H. trolli . The redescription of this species will improve identification and aid in the taxonomic resolution of Southeastern Pacific Ocean chimaeras. A key to species of Hydrolagus in the Southeastern Pacific Ocean is provided.
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Hydrolagus erithacus sp nov chimaeriformes chimaeridae a new species of chimaerid from the southeastern atlantic and southwestern indian oceans
Zootaxa, 2017Co-Authors: Kristin Walovich, David A Ebert, Jenny M. KemperAbstract:A new species of chimaerid, Hydrolagus erithacus sp. nov., is described from nine specimens collected from the southeast Atlantic and southwest Indian oceans from depths of 470–1,000 meters. This species is distinguished from all other Hydrolagus species based on the following characteristics: head bulky, relatively large, followed by stocky body; head and body height from about pectoral fin origin to pelvic fin origin similar, then tapering rapidly to filamentous tail; first dorsal fin spine height about equal to, or slightly less than first dorsal fin apex height; second dorsal fin up to 81% of total body length and uniform in height; trifurcate claspers forked for approximately 20% of total length; robust frontal tenaculum nearly uniform in width, prepelvic tenaculae with five to seven medial spines, and a uniform black coloration with robust, non-deciduous skin. Comparison of mitochondrial NADH2 gene sequences with other morphologically similar Hydrolagus species suggests that H. erithacus is a distinct species.
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first north pacific records of the pointy nosed blue chimaera Hydrolagus cf trolli chondrichthyes chimaeriformes chimaeridae
Marine Biodiversity Records, 2016Co-Authors: Amber N Reichert, David A Ebert, Lonny LundstenAbstract:The occurrence of Hydrolagus cf. trolli is reported for the first time from the central and eastern North Pacific Ocean. This is a geographic range extension for this species, as it was previously only known to occur in the southern Pacific Ocean off of Australia, New Zealand, and New Caledonia.
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redescription of Hydrolagus africanus gilchrist 1922 chimaeriformes chimaeridae with a review of southern african chimaeroids and a key to their identification
African Journal of Marine Science, 2015Co-Authors: K A Walovich, Douglas J Long, David A Ebert, D A DidierAbstract:Hydrolagus africanus (Gilchrist, 1922) is a little‑known chimaeroid species, originally described from the KwaZulu‑ Natal coast of South Africa, with a range spanning the western Indian Ocean from Kenya, south to Mozambique and South Africa, and extending into the south‑eastern Atlantic to Namibia. This species is characterised by a lateral patch of denticles on the male prepelvic tenacula, a second dorsal fin slightly indented in the centre, a long, curved dorsal spine equal to or sometimes exceeding the height of the first dorsal fin, and a uniform light brown body with no distinctive markings or patterns and slightly darker brown fins. To clarify the taxonomic status of H. africanus, we examined and compared specimens from throughout its range in southern Africa. Because the syntypes of H. africanus are lost, we designate a neotype and redescribe the species based on the neotype and additional southern African specimens. In addition, we present a review of southern African chimaeroids and provide an up...
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new eastern pacific ocean records of Hydrolagus melanophasma with annotations of a juvenile female
Journal of Fish Biology, 2013Co-Authors: H Aguirrevillasenor, C Salassingh, J Madridvera, J Martinezortiz, D A Didier, David A EbertAbstract:Two new records of Hydrolagus melanophasma, one juvenile female from off the central Mexican coast and one adult male from off the coast of Ecuador, confirm the presence of this species throughout its known range in the eastern Pacific Ocean, from southern California, U.S.A., to Valdivia, Chile. This report gives a description and comparison of proportional measurements, head shape and colouration for juvenile and adult H. melanophasma. A taxonomic key to distinguish the eastern Pacific Ocean species of Hydrolagus is included.
Dominique A Didier - One of the best experts on this subject based on the ideXlab platform.
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presencia de Hydrolagus macrophthalmus chondrichthyes holocephali chimaeridae en el pacifico nororiental
Revista Mexicana de Biodiversidad; Vol 81 No 001, 2011Co-Authors: Adrian F Gonzalezacosta, Dominique A Didier, Jose Luis Castroaguirre, Rafael Velezmarin, Luis A BurnesromoAbstract:Se registra por primera vez la presencia de la quimera Hydrolagus macrophthalmus De Buen, 1959, en aguas del Pacifico nororiental; especie cuya distribucion se consideraba como exclusiva del Pacifico sur oriental. El 13 de abril de 1995, se recolecto 1 ejemplar macho (945 mm TL) en la superficie del mar frente a Manzanillo, Colima (Mexico: 18o 30’N, 104o 15’O), en una zona de gran profundidad (2 000 m). Su presencia, incrementa el numero de quimeras del Pacifico nororiental y asimismo, amplia su distribucion hacia el hemisferio norte.
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presencia de Hydrolagus macrophthalmus chondrichthyes holocephali chimaeridae en el pacifico nororiental
Revista Mexicana De Biodiversidad, 2010Co-Authors: Adrian F Gonzalezacosta, Dominique A Didier, Jose Luis Castroaguirre, Rafael Velezmarin, Luis A BurnesromoAbstract:The southeastern Pacific chimaeroid Hydrolagus macrophthalmus De Buen, 1959, is reported for the first time in the northeastern Pacific on the basis of 1 male specimen (945 mm TL) caught on 13 April 1995 off Manzanillo, Colima (Mexico: 18o 30’N, 104o 15’W) at the surface above deep water (2 000 m). The first occurrence of this species increases the number of chimaeroid species known in the northeastern Pacific and expands their known range.
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occurrence of Hydrolagus macrophthalmus chondrichthyes holocephali chimaeridae in the northeastern pacifi c presencia de Hydrolagus macrophthalmus chondrichthyes holocephali chimaeridae en el pacifi co nororiental
2010Co-Authors: Adrian F Gonzalezacosta, Dominique A Didier, Jose Luis Castroaguirre, Rafael Velezmarin, Luis A BurnesromoAbstract:The southeastern Pacifi c chimaeroid Hydrolagus macrophthalmus De Buen, 1959, is reported for the fi rst time in the northeastern Pacifi c on the basis of 1 male specimen (945 mm TL) caught on 13 April 1995 off Manzanillo, Colima (Mexico: 18o 30'N, 104o 15'W) at the surface above deep water (2 000 m). The fi rst occurrence of this species increases the number of chimaeroid species known in the northeastern Pacifi c and expands their known range.
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a new species of chimaera Hydrolagus melanophasma sp nov chondrichthyes chimaeriformes chimaeridae from the eastern north pacific
Zootaxa, 2009Co-Authors: Kelsey C James, David A Ebert, Douglas J Long, Dominique A DidierAbstract:A new species of chimaera, Hydrolagus melanophasma sp. nov. (Chimaeridae), is described from the eastern North Pacific. It is distinct from other eastern Pacific chimaeroids by the following characteristics: a large slightly curved dorsal fin spine extending beyond dorsal fin apex, a long second dorsal fin of uniform height throughout, large pectoral fins extending beyond the pelvic fin insertion when laid flat, trifid claspers forked for approximately one-quarter the total clasper length and a uniform black coloration throughout. The new species is compared to other eastern Pacific members of the genus Hydrolagus including H. alphus, H. colliei, H. macrophthalmus, and H. mccoskeri. Remote Operated Vehicle (ROV) video footage has identified and documented Hydrolagus melanophasma from the Gulf of California. ROV observations suggest that individuals typically occur over soft-bottom habitats or cobble patches with minimal vertical relief. This is in contrast to other eastern Pacific Hydrolagus species that tend to occur in areas of high rocky relief. The known distribution of this new species at present extends from southern California, U.S.A., along the Pacific coast of Baja California, Mexico, and into the Gulf of California.
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a new species of chimaeroid Hydrolagus alphus sp nov chimaeriformes chimaeridae from the galapagos islands
Zootaxa, 2006Co-Authors: K L Quaranta, Dominique A Didier, Douglas J Long, David A EbertAbstract:A new species of chimaerid belonging to the genus Hydrolagus Gill, 1862 is described from two specimens collected from the Galapagos Islands. This species was taken from depths ranging from 600 – 900 m. Hydrolagus alphus sp. nov. is distinguished from other members of the genus by having proportionately large eyes, dark brown coloration with a noticeable white spot on lateral side, paired fins with a bluish hue and white distal margins, and second dorsal fin with dark anterior and posterior sections separated by a middle portion indented and completely white. This new species is compared to Hydrolagus macrophthalmus, the most similar congener and Hydrolagus mccoskerii the only other known species within this genus to occur in the eastern South Pacific.
Joao P S Correia - One of the best experts on this subject based on the ideXlab platform.
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Long‐term transportation of ratfish, Hydrolagus colliei, and tiger rockfish, Sebastes nigrocinctus
Zoo Biology, 2001Co-Authors: Joao P S CorreiaAbstract:On December 10, 2000, five tiger rockfish, Sebastes nigrocinctus, and 10 ratfish, Hydrolagus colliei, were transported from Vancouver, Canada, to Lisbon, Portugal, for 51 and 44 hours, respectively. The transport vessels consisted of large circular tanks (1.0-m diameter × 0.6 m high) and filtration was added to the rockfish tank only. Filtration consisted of a combination of cartridge and activated carbon, powered by a 12-V bilge pump placed on the middle of the transport vessel. Water quality parameters (ammonia, temperature, and oxygen saturation) were tested during the transport, and an ammonia detoxifier was added to some of the transport vessels when ammonia concentration reached 0.25 mg/L. Sodium bicarbonate was also added for pH buffering. All animals survived the trip and the subsequent 4 weeks. The water quality monitoring and treatment regimen therefore seemed appropriate for this type of long-term transportation. Zoo Biol 20:435–441, 2001. © 2001 Wiley-Liss, Inc.
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long term transportation of ratfish Hydrolagus colliei and tiger rockfish sebastes nigrocinctus
Zoo Biology, 2001Co-Authors: Joao P S CorreiaAbstract:On December 10, 2000, five tiger rockfish, Sebastes nigrocinctus, and 10 ratfish, Hydrolagus colliei, were transported from Vancouver, Canada, to Lisbon, Portugal, for 51 and 44 hours, respectively. The transport vessels consisted of large circular tanks (1.0-m diameter × 0.6 m high) and filtration was added to the rockfish tank only. Filtration consisted of a combination of cartridge and activated carbon, powered by a 12-V bilge pump placed on the middle of the transport vessel. Water quality parameters (ammonia, temperature, and oxygen saturation) were tested during the transport, and an ammonia detoxifier was added to some of the transport vessels when ammonia concentration reached 0.25 mg/L. Sodium bicarbonate was also added for pH buffering. All animals survived the trip and the subsequent 4 weeks. The water quality monitoring and treatment regimen therefore seemed appropriate for this type of long-term transportation. Zoo Biol 20:435–441, 2001. © 2001 Wiley-Liss, Inc.
German Pequeno - One of the best experts on this subject based on the ideXlab platform.
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Primer registro de Hydrolagus pallidus Hardy & Stehmann, 1990 (Chondrichthyes: Chimaeridae) en el Océano Pacífico, con comentarios sobre los holocéfalos de Chile First record of Hydrolagus pallidus Hardy & Stehmann, 1990 (Chondrichthyes: Chimaeridae)
2020Co-Authors: Isabel Andrade, German PequenoAbstract:A first record of the holocephalian Hydrolagus pallidus Hardy & Stehmann, 1990, in waters of the Southeastern Pacific ocean on the basis of one male specimen 660 mm TL is communicated. The finding occurred in the easternmost area of the Juan Fernandez submarine dorsal. The morphometric measurements of the specimen studied are compared with those described for the holotype. Short comments are added and a currently prepared taxonomic key to distinguish Chilean Holocephali is included.
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primer registro de Hydrolagus pallidus hardy stehmann 1990 chondrichthyes chimaeridae en el oceano pacifico con comentarios sobre los holocefalos de chile
Revista De Biologia Marina Y Oceanografia, 2006Co-Authors: Isabel Andrade, German PequenoAbstract:A first record of the holocephalian Hydrolagus pallidus Hardy & Stehmann, 1990, in waters of the Southeastern Pacific ocean on the basis of one male specimen 660 mm TL is communicated. The finding occurred in the easternmost area of the Juan Fernandez submarine dorsal. The morphometric measurements of the specimen studied are compared with those described for the holotype. Short comments are added and a currently prepared taxonomic key to distinguish Chilean Holocephali is included.
Jenny M. Kemper - One of the best experts on this subject based on the ideXlab platform.
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Redescription of the bigeye chimaera, Hydrolagus macrophthalmus de Buen, 1959 (Chondrichthyes: Chimaeriformes), with a genetic characterization of the species
Marine Biodiversity, 2019Co-Authors: David A Ebert, Jenny M. Kemper, Kristin Walovich, Kimberly L. QuarantaAbstract:Hydrolagus macrophthalmus de Buen, 1959 is a little known chimaerid species from the southeastern Pacific Ocean. At the time of its description, it was the only chimaeroid species known from the region; however, there now are four other Hydrolagus species known from the area. Hydrolagus macrophthalmus is distinct from other species in the area based on the following characters: an undulated second dorsal fin with peaks on the anterior and posterior regions, a long curved first dorsal fin spine that extends past the origin of the second dorsal fin when laid flat, and uniform dark brown color with a light spot on middle of the second dorsal fin that extends onto the body below it. Genetic sequencing of the NADH2 gene was used to distinguish H. macrophthalmus from other known species in the region. This species is herein re-described and compared to four sympatric species: H. alphus , H. melanophasma , H. mccoskeri , and H. trolli . The redescription of this species will improve identification and aid in the taxonomic resolution of Southeastern Pacific Ocean chimaeras. A key to species of Hydrolagus in the Southeastern Pacific Ocean is provided.
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Redescription of Chimaera ogilbyi (Chimaeriformes; Chimaeridae) from the Indo-Australian region.
Zootaxa, 2018Co-Authors: Brittany Finucci, Jenny M. Kemper, William T. White, Gavin J. P. NaylorAbstract:An integrated taxonomic approach, combining both morphological and molecular data, was adopted to investigate the Hydrolagus lemures-ogilbyi group in the Indo-Australian region. Single mitochondrial markers (CO1 and NADH2) provided evidence supporting the separation of four distinct species in this group. However, detailed morphological data collected from specimens from across their range failed to find any consistent differences, and many features previously considered to be diagnostic were found to be variable. Nuclear DNA data also failed to support the differences found with the single mitochondrial markers and, together with the morphological data, supported the hypothesis that only a single species in this group is present in the Indo-Australian region. In addition, the results failed to support the current generic placement of this group in Hydrolagus , suggesting they belong to the genus Chimaera with doubt over the validity of Hydrolagus as a valid genus. The oldest available name for this group is Chimaera ogilbyi and a redescription is provided. This species occurs throughout Australia, eastern Indonesia (Java, Bali, and Lombok) and northern Papua New Guinea.
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Hydrolagus erithacus sp nov chimaeriformes chimaeridae a new species of chimaerid from the southeastern atlantic and southwestern indian oceans
Zootaxa, 2017Co-Authors: Kristin Walovich, David A Ebert, Jenny M. KemperAbstract:A new species of chimaerid, Hydrolagus erithacus sp. nov., is described from nine specimens collected from the southeast Atlantic and southwest Indian oceans from depths of 470–1,000 meters. This species is distinguished from all other Hydrolagus species based on the following characteristics: head bulky, relatively large, followed by stocky body; head and body height from about pectoral fin origin to pelvic fin origin similar, then tapering rapidly to filamentous tail; first dorsal fin spine height about equal to, or slightly less than first dorsal fin apex height; second dorsal fin up to 81% of total body length and uniform in height; trifurcate claspers forked for approximately 20% of total length; robust frontal tenaculum nearly uniform in width, prepelvic tenaculae with five to seven medial spines, and a uniform black coloration with robust, non-deciduous skin. Comparison of mitochondrial NADH2 gene sequences with other morphologically similar Hydrolagus species suggests that H. erithacus is a distinct species.
