Using data for 25,780 species categorized on the International Union for Conservation of Nature R... more Using data for 25,780 species categorized on the International Union for Conservation of Nature Red List, we present an assessment of the status of the world's vertebrates. One-fifth of species are classified as Threatened, and we show that this figure is increasing: On average, 52 species of mammals, birds, and amphibians move one category closer to extinction each year. However, this overall pattern conceals the impact of conservation successes, and we show that the rate of deterioration would have been at ...
Using data for 25,780 species categorized on the International Union for Conservation of Nature R... more Using data for 25,780 species categorized on the International Union for Conservation of Nature Red List, we present an assessment of the status of the world's vertebrates. One-fifth of species are classified as Threatened, and we show that this figure is increasing: On average, 52 species of mammals, birds, and amphibians move one category closer to extinction each year. However, this overall pattern conceals the impact of conservation successes, and we show that the rate of deterioration would have been at ...
Spinoid scales appear early in the development of Swordfish, Xiphias gladius, and are first disce... more Spinoid scales appear early in the development of Swordfish, Xiphias gladius, and are first discernable in the larval stage. Scales vary in form between two principal types: small single and multispined scales and large multispined scales. Unlike the typical teleostean condition, Xiphias scales are attached along their base, not at their proximal end within scale pockets. Scales persist in juveniles and adults, that is, scales are not shed or resorbed. Scales become more deeply embedded within the dermis as the dermis thickens in ontogeny; consequently only the tips of spines protrude through the dermis of adults. A network of mucous canals with regularly spaced pores to the exterior develop in the dermis of adults, and the mucus produced further insulates scales from the surface of the integument. The ontogeny of the squamation of Xiphias differs from that of the related Istiophoridae.
Reproduction and Sexuality in Marine FishesPatterns and Processes, 2010
... 1984a). Maximum size of the two large species, Cololabis saira and Scomberesox saurus, 400 to... more ... 1984a). Maximum size of the two large species, Cololabis saira and Scomberesox saurus, 400 to 762 mm SL respectively; maximum size of the two dwarf species, C. adocoetus, 126 mm and S. simulans, 68 mm. ... Scomberesocidae FL Cololabis saira 400 mm 2 no?-/ all? ...
Ammodytoides gilli (Bean, 1895) is the correct name for the tropical eastern Pacific sand lance. ... more Ammodytoides gilli (Bean, 1895) is the correct name for the tropical eastern Pacific sand lance. Its range is extended from Cabo San Lucas, Baja California south to Panama, Ecuador, and the Galapagos Islands. Ammodytes lucasanus Beebe and Tee-Van, 1938 is a junior synonym. Types of both nominal species were re-examined. The species is redescribed based on 50 specimens (42.3-115 mm SL) from 12 lots and is compared with other known species of Ammodytoides. Changes in ontogeny from the smallest known specimen (42.3 mm SL, illustrated) are detailed including reduction in the posterior dorsal fin lobe and development of branched dorsal and anal fin rays.
The tropical eastern Pacific halfbeak previously considered conspecific with the western Atlantic... more The tropical eastern Pacific halfbeak previously considered conspecific with the western Atlantic Hyporhamphus unifasciatus (Ranzani 1842) is described as a new species, H. naos. It resembles H. meeki from the Atlantic and Gulf coasts of the United States in number of gill rakers on the first arch (usually 32-36, mean 33.6), more than in H. unifasciatus (usually 29-32, mean 30.6), but fewer than in other sympatric species of eastern Pacific Hyporhamphus. Results of a three-treatment ANCOVA (H. naos, H. meeki, and H. unifasciatus) show significant differences in slopes and means for all 14 morphometric characters examined, 9 of 14 characters comparing H. naos with H. unifasciatus, and 7 of 14 comparing H. naos with H. meeki. Protein electrophoretic patterns clearly distinguish all three species with a number of fixed allelic differences.
... Reeve M. Bailey, Petru Banarescu, Daniel M. Cohen, JAF Garrick, Robert H. Gibbs, Jr., Ernest ... more ... Reeve M. Bailey, Petru Banarescu, Daniel M. Cohen, JAF Garrick, Robert H. Gibbs, Jr., Ernest A. Lachner, William J. Richards, W. Ralph Taylor, and Stanley H. Weitzman have read drafts of the ... DUMITRESCU, MARGARETA, PETRU BXNXRESCU, AND NICOLAE STOICA. ...
Using data for 25,780 species categorized on the International Union for Conservation of Nature R... more Using data for 25,780 species categorized on the International Union for Conservation of Nature Red List, we present an assessment of the status of the world's vertebrates. One-fifth of species are classified as Threatened, and we show that this figure is increasing: On average, 52 species of mammals, birds, and amphibians move one category closer to extinction each year. However, this overall pattern conceals the impact of conservation successes, and we show that the rate of deterioration would have been at ...
Using data for 25,780 species categorized on the International Union for Conservation of Nature R... more Using data for 25,780 species categorized on the International Union for Conservation of Nature Red List, we present an assessment of the status of the world's vertebrates. One-fifth of species are classified as Threatened, and we show that this figure is increasing: On average, 52 species of mammals, birds, and amphibians move one category closer to extinction each year. However, this overall pattern conceals the impact of conservation successes, and we show that the rate of deterioration would have been at ...
Spinoid scales appear early in the development of Swordfish, Xiphias gladius, and are first disce... more Spinoid scales appear early in the development of Swordfish, Xiphias gladius, and are first discernable in the larval stage. Scales vary in form between two principal types: small single and multispined scales and large multispined scales. Unlike the typical teleostean condition, Xiphias scales are attached along their base, not at their proximal end within scale pockets. Scales persist in juveniles and adults, that is, scales are not shed or resorbed. Scales become more deeply embedded within the dermis as the dermis thickens in ontogeny; consequently only the tips of spines protrude through the dermis of adults. A network of mucous canals with regularly spaced pores to the exterior develop in the dermis of adults, and the mucus produced further insulates scales from the surface of the integument. The ontogeny of the squamation of Xiphias differs from that of the related Istiophoridae.
Reproduction and Sexuality in Marine FishesPatterns and Processes, 2010
... 1984a). Maximum size of the two large species, Cololabis saira and Scomberesox saurus, 400 to... more ... 1984a). Maximum size of the two large species, Cololabis saira and Scomberesox saurus, 400 to 762 mm SL respectively; maximum size of the two dwarf species, C. adocoetus, 126 mm and S. simulans, 68 mm. ... Scomberesocidae FL Cololabis saira 400 mm 2 no?-/ all? ...
Ammodytoides gilli (Bean, 1895) is the correct name for the tropical eastern Pacific sand lance. ... more Ammodytoides gilli (Bean, 1895) is the correct name for the tropical eastern Pacific sand lance. Its range is extended from Cabo San Lucas, Baja California south to Panama, Ecuador, and the Galapagos Islands. Ammodytes lucasanus Beebe and Tee-Van, 1938 is a junior synonym. Types of both nominal species were re-examined. The species is redescribed based on 50 specimens (42.3-115 mm SL) from 12 lots and is compared with other known species of Ammodytoides. Changes in ontogeny from the smallest known specimen (42.3 mm SL, illustrated) are detailed including reduction in the posterior dorsal fin lobe and development of branched dorsal and anal fin rays.
The tropical eastern Pacific halfbeak previously considered conspecific with the western Atlantic... more The tropical eastern Pacific halfbeak previously considered conspecific with the western Atlantic Hyporhamphus unifasciatus (Ranzani 1842) is described as a new species, H. naos. It resembles H. meeki from the Atlantic and Gulf coasts of the United States in number of gill rakers on the first arch (usually 32-36, mean 33.6), more than in H. unifasciatus (usually 29-32, mean 30.6), but fewer than in other sympatric species of eastern Pacific Hyporhamphus. Results of a three-treatment ANCOVA (H. naos, H. meeki, and H. unifasciatus) show significant differences in slopes and means for all 14 morphometric characters examined, 9 of 14 characters comparing H. naos with H. unifasciatus, and 7 of 14 comparing H. naos with H. meeki. Protein electrophoretic patterns clearly distinguish all three species with a number of fixed allelic differences.
... Reeve M. Bailey, Petru Banarescu, Daniel M. Cohen, JAF Garrick, Robert H. Gibbs, Jr., Ernest ... more ... Reeve M. Bailey, Petru Banarescu, Daniel M. Cohen, JAF Garrick, Robert H. Gibbs, Jr., Ernest A. Lachner, William J. Richards, W. Ralph Taylor, and Stanley H. Weitzman have read drafts of the ... DUMITRESCU, MARGARETA, PETRU BXNXRESCU, AND NICOLAE STOICA. ...
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