NEW GENUS OF MEGALAMPHODINAE WITH REVISED TAXONOMY AND OSTEOLOGY OF HEMIGRAMMUS STICTUS (CHARACIFORMES: ACESTRORHAMPHIDAE)
"2025-02-12 10:36:07" // app/Providers/../Base/Publico/Artigo/resources/show_includes/info_artigo.blade.php
App\Base\Administrativo\Model\Artigo {#1843 // app/Providers/../Base/Publico/Artigo/resources/show_includes/info_artigo.blade.php #connection: "mysql" +table: "artigo" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:35 [ "id" => 119773 "edicao_id" => 384 "trabalho_id" => 258 "inscrito_id" => 621 "titulo" => "NEW GENUS OF MEGALAMPHODINAE WITH REVISED TAXONOMY AND OSTEOLOGY OF HEMIGRAMMUS STICTUS (CHARACIFORMES: ACESTRORHAMPHIDAE)" "resumo" => "Recent phylogenomic evidence derived from ultraconserved elements (UCEs) indicates that Hemigrammus stictus Durbin 1909 belongs to a distinct genus-level clade within Megalamphodinae of the family Acestrorhamphidae. The phylogeny resulted in a clade with Petitella Géry & Boutière 1964, Hemigrammus stictus, Brittanichthys Géry 1965, Paracheirodon Géry 1960, and Megalamphodus Eigenmann 1915 in Megalamphodinae, whereas the type species of Hemigrammus, the H. unilineatus Gill 1858, is placed within Pristellinae. Based on that evidence, we propose a new genus that formally allocates Hemigrammus stictus, revise its systematics, distribution, type-series, and provide osteological data from microcomputed tomography (µCT) images. The newly described genus, which includes H. stictus, possesses a derived condition of a dense layer of erythrophores enveloping the caudal peduncle and surrounding areas, as well as a posteriorly placed, oval-shaped humeral mark with a high density of melanophores in both live and preserved specimens. Corrections have been made in the type series described by Durbin, which mistakenly included specimens of curimatids, iguanodectids, and other acestrorhamphids. We redescribe H. stictus using type, topotype, and non-type specimens from the Amazonas, Negro, Branco, Xingu, Atabapo, Ventuari, Meta, Orinoco, Essequibo, Berbice, Demerara, Mahaica, and Rupununi rivers. The presence of an intense layer of erythrophores is synapomorphic for the new genus, Petitella, Brittanichthys, and Paracheirodon within Megalamphodinae. µCT images of the new genus reveals distinctive anatomical modifications in the neurocranium, including a pointed posterodorsal region and a laterally enlarged, square-shaped anteroventral section of the antorbital. Future research will examine the genomic fingerprints associated with the development of erythrophores, which seem relevant to the evolution of Megalamphodinae." 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The phylogeny resulted in a clade with Petitella Géry & Boutière 1964, Hemigrammus stictus, Brittanichthys Géry 1965, Paracheirodon Géry 1960, and Megalamphodus Eigenmann 1915 in Megalamphodinae, whereas the type species of Hemigrammus, the H. unilineatus Gill 1858, is placed within Pristellinae. Based on that evidence, we propose a new genus that formally allocates Hemigrammus stictus, revise its systematics, distribution, type-series, and provide osteological data from microcomputed tomography (µCT) images. The newly described genus, which includes H. stictus, possesses a derived condition of a dense layer of erythrophores enveloping the caudal peduncle and surrounding areas, as well as a posteriorly placed, oval-shaped humeral mark with a high density of melanophores in both live and preserved specimens. Corrections have been made in the type series described by Durbin, which mistakenly included specimens of curimatids, iguanodectids, and other acestrorhamphids. We redescribe H. stictus using type, topotype, and non-type specimens from the Amazonas, Negro, Branco, Xingu, Atabapo, Ventuari, Meta, Orinoco, Essequibo, Berbice, Demerara, Mahaica, and Rupununi rivers. The presence of an intense layer of erythrophores is synapomorphic for the new genus, Petitella, Brittanichthys, and Paracheirodon within Megalamphodinae. µCT images of the new genus reveals distinctive anatomical modifications in the neurocranium, including a pointed posterodorsal region and a laterally enlarged, square-shaped anteroventral section of the antorbital. Future research will examine the genomic fingerprints associated with the development of erythrophores, which seem relevant to the evolution of Megalamphodinae." 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