Holocephali

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Evgeny V Popov - One of the best experts on this subject based on the ideXlab platform.

  • systematic reassessment of edaphodon eyrensis long 1985 Holocephali chimaeroidei from the early cretaceous of south australia
    Journal of Vertebrate Paleontology, 2020
    Co-Authors: Evgeny V Popov
    Abstract:

    A chimaeroid species, Edaphodon eyrensis Long, 1985 (Holocephali, Chimaeroidei), from the Lower Cretaceous Bulldog Shale of the Eromanga Basin, South Australia, is reassessed as Ptyktoptychion eyre...

  • a new callorhinchid genus Holocephali chimaeroidei from the early bajocian of ottange rumelange on the luxembourg french border
    Paleontological Research, 2019
    Co-Authors: Evgeny V Popov, Dominique Delsate, Roland Felten
    Abstract:

    An incomplete chimaeroid (Holocephali, Chimaeroidei) mandibular dental plate from the early Bajocian (Humphriesianum Zone) of Ottange-Rumelange, on the Luxembourg-French border, is described as a new genus and species of callorhinchid fish Ottangodus lotharingiae gen. et sp. nov. Comparison of the described plate with other Jurassic chimaeriform fish (both myricanthid and chimaeroid) mandibular plates shows relationships with callorhinchids and in turn close relationships with the genus Pachymylus Woodward, known from the Callovian of England. The plate of the new genus shows a set of primitive characters for chimaeroids (very high descending lamina, low oral part of the plate, large centrally placed median tritor occupying most of the oral part of the plate and an absence of mesio-labial system of the tritors) and could thus belong to a basal Chimaeroidei taxon. This is the first record of the Chimaeroidei from the Jurassic of Lorraine and the fourth chimaeriform genus known from the Mesozoic of the region.

  • the late cretaceous chimaeroid fish ischyodus bifurcatus case chondrichthyes Holocephali from california usa and its paleobiogeographical significance
    Paleontological Research, 2018
    Co-Authors: Evan Johnsonransom, Evgeny V Popov, Thomas A Demere, Kenshu Shimada
    Abstract:

    A nearly complete right mandibular tooth plate of Ischyodus bifurcatus Case (Holocephali: Chimaeroidei) is reported from the Point Loma Formation (upper Campanian) of the Upper Cretaceous Rosario Group in southern California, USA. The individual is estimated to have measured nearly 1 m in total body length. Remains of I. bifurcatus have been reported from marine rocks deposited in epicontinental seas and continental shelf paleoenvironments of temperate latitudes in the Northern Hemisphere. Previous records of the species consist of specimens from Santonian to Maastrichtian strata of the US (Delaware, New Jersey, North Carolina, Georgia, Alabama, Arkansas, Montana, and Wyoming), Sweden, and European Russia. The tooth plate described herein is the first verifiable record of I. bifurcatus from California, and, more significantly, represents the only known definite Mesozoic record of Ischyodus from the entire North Pacific region.

  • late albian chimaeroid fishes Holocephali chimaeroidei from annopol poland
    Cretaceous Research, 2014
    Co-Authors: Evgeny V Popov, Marcin Machalski
    Abstract:

    Abstract Remains of Late Albian chimaeroid fishes (Holocephali, Chimaeroidei) are described from the mid-Cretaceous condensed succession of the Annopol anticline, Poland. The described material consists of dental plates, dorsal-fin spines and a single frontal clasper. These remains are assigned to five genera and seven species of ‘edaphodontids’, namely Ischyodus thurmanni, Ischyodus aff. bifurcatus , ‘ Ischyodus incisus ’, Elasmodus sp., Elasmodectes sp., Lebediodon oskolensis and Edaphodon sedgwickii . Most of these taxa are recorded from Poland for the first time, documenting a much greater regional chimaeroid diversity than previously recognised. In terms of taxonomic composition, the Annopol chimaeroid fauna is intermediate between coeval assemblages from the Cambridge Greensand (England) and from Belgorod Province, Russia, having more taxa in common with the latter.

Dominique A. Didier - One of the best experts on this subject based on the ideXlab platform.

  • presencia de hydrolagus macrophthalmus chondrichthyes Holocephali chimaeridae en el pacifico nororiental
    Revista Mexicana de Biodiversidad; Vol 81 No 001, 2011
    Co-Authors: Adrian F Gonzalezacosta, Jose Luis Castroaguirre, Rafael Velezmarin, Dominique A. Didier, Luis A Burnesromo
    Abstract:

    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.

  • presencia de hydrolagus macrophthalmus chondrichthyes Holocephali chimaeridae en el pacifico nororiental
    Revista Mexicana De Biodiversidad, 2010
    Co-Authors: Adrian F Gonzalezacosta, Jose Luis Castroaguirre, Rafael Velezmarin, Dominique A. Didier, Luis A Burnesromo
    Abstract:

    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.

  • occurrence of hydrolagus macrophthalmus chondrichthyes Holocephali chimaeridae in the northeastern pacifi c presencia de hydrolagus macrophthalmus chondrichthyes Holocephali chimaeridae en el pacifi co nororiental
    2010
    Co-Authors: Adrian F Gonzalezacosta, Jose Luis Castroaguirre, Rafael Velezmarin, Dominique A. Didier, Luis A Burnesromo
    Abstract:

    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.

  • Description of a new species of chimaerid, Chimaera bahamaensis from the Bahamas (Holocephali: Chimaeridae)
    Bulletin of Marine Science, 2010
    Co-Authors: Jenny M. Kemper, Dominique A. Didier, David A. Ebert, Leonard J. V. Compagno
    Abstract:

    A new species of chimaera, Chimaera bahamaensis sp. nov., is described from a single specimen collected in Bahamian waters, east of Andros Island, in the western North Atlantic. The new species is only the fourth member of this genus known to occur in the Atlantic Ocean. It is distinguished from other Atlantic Ocean Chimaera species by a combination of morphometric characters and coloration including a relatively large body, long pre-narial length, short pectoral-pelvic space, long pelvic-caudal space, caudal ventral margin ending slightly posterior to caudal dorsal margin, and a uniform caramel brown coloration with dark brown fins. This new species is compared to Chimaera monstrosa Linnaeus, 1758, Chimaera cubana Howell-Rivero, 1936, and Chimaera cf. monstrosa, the only other species in the genus Chimaera known to occur in the Atlantic Ocean.

  • Two new species of chimaeroid fishes from the southwestern Pacific Ocean (Holocephali, Chimaeridae)
    Ichthyological Research, 2002
    Co-Authors: Dominique A. Didier
    Abstract:

     Two new species of chimaeroid fishes from the family Chimaeridae are described on the basis of morphological characters. The carpenter's chimaera is a large-bodied species of Chimaera distinguished from its congeners by massive head with blunt snout; firm, nondeciduous skin; purplish color; preopercular and oral lateral line canals branching together; and pelvic claspers that are divided for the distal one third of length, purple at the base with white fleshy tips. The pale ghost shark is a species of Hydrolagus distinguished from its congeners by a dorsal fin spine that reaches to the origin of the second dorsal fin when depressed; elongate second dorsal fin not indented along its length; preopercular and oral lateral line canals sharing a common branch; long, stout caudal filament; and pale silvery-gray coloration fading to white ventrally. The pale ghost shark has long been recognized as a new species from New Zealand, and formal taxonomic recognition of this species will prove important for fishery management.

Luis A Burnesromo - One of the best experts on this subject based on the ideXlab platform.

Sankar Chatterjee - One of the best experts on this subject based on the ideXlab platform.

Cathrin Pfaff - One of the best experts on this subject based on the ideXlab platform.

  • ultimate eocene priabonian chondrichthyans Holocephali elasmobranchii of antarctica
    Journal of Vertebrate Paleontology, 2016
    Co-Authors: Jürgen Kriwet, Andrea Engelbrecht, Thomas Mors, Marcelo Alfredo Reguero, Cathrin Pfaff
    Abstract:

    ABSTRACTThe Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula, is known for its remarkable wealth of fossil remains of chondrichthyans and teleosts. Chondrichthyans seemingly were dominant elements in the Antarctic Paleogene fish fauna, but decreased in abundance from middle to late Eocene, during which time remains of bony fishes increase. This decline of chondrichthyans at the end of the Eocene generally is related to sudden cooling of seawater, reduction in shelf area, and increasing shelf depth due to the onset of the Antarctic thermal isolation. The last chondrichthyan records known so far include a chimeroid tooth plate from TELM 6 (Lutetian) and a single pristiophorid rostral spine from TELM 7 (Priabonian). Here, we present new chondrichthyan records of Squalus, Squatina, Pristiophorus, Striatolamia, Palaeohypotodus, Carcharocles, and Ischyodus from the upper parts of TELM 7 (Priabonian), including the first record of Carcharocles sokolovi from Antarctica. This assemblage suggests t...

  • Ultimate Eocene (Priabonian) chondrichthyans (Holocephali, Elasmobranchii) of Antarctica
    2016
    Co-Authors: Jürgen Kriwet, Andrea Engelbrecht, Thomas Mors, Marcelo Alfredo Reguero, Cathrin Pfaff
    Abstract:

    The Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula, is known for its remarkable wealth of fossil remains of chondrichthyans and teleosts. Chondrichthyans seemingly were dominant elements in the Antarctic Paleogene fish fauna, but decreased in abundance from middle to late Eocene, during which time remains of bony fishes increase. This decline of chondrichthyans at the end of the Eocene generally is related to sudden cooling of seawater, reduction in shelf area, and increasing shelf depth due to the onset of the Antarctic thermal isolation. The last chondrichthyan records known so far include a chimeroid tooth plate from TELM 6 (Lutetian) and a single pristiophorid rostral spine from TELM 7 (Priabonian). Here, we present new chondrichthyan records of Squalus, Squatina, Pristiophorus, Striatolamia, Palaeohypotodus, Carcharocles, and Ischyodus from the upper parts of TELM 7 (Priabonian), including the first record of Carcharocles sokolovi from Antarctica. This assemblage suggests that chondrichthyans persisted much longer in Antarctic waters despite rather cool sea surface temperatures of approximately 5°C. The final disappearance of chondrichthyans at the Eocene–Oligocene boundary concurs with abrupt ice sheet formation in Antarctica. Diversity patterns of chondrichthyans throughout the La Meseta Formation appear to be related to climatic conditions rather than plate tectonics. SUPPLEMENTAL DATA—Supplemental materials are available for this article for free at www.tandfonline.com/ujvp Citation for this article: Kriwet, J., A. Engelbrecht, T. Mörs, M. Reguero, and C. Pfaff. 2016. Ultimate Eocene (Priabonian) chondrichthyans (Holocephali, Elasmobranchii) of Antarctica. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2016.1160911.

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