{"id":7972,"date":"2024-04-26T14:49:23","date_gmt":"2024-04-26T14:49:23","guid":{"rendered":"http:\/\/clam.com.br\/?p=4726"},"modified":"2025-10-27T22:31:50","modified_gmt":"2025-10-28T01:31:50","slug":"phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae","status":"publish","type":"post","link":"https:\/\/clam.com.br\/en\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\/","title":{"rendered":"Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Numerous rivers, interrupted by large waterfalls and extensive rapids, drain the geologically ancient Guiana Shield Highlands. We describe a new armoured catfish genus and two new species endemic to the upper Ireng and Kuribrong rivers, respective tributaries of the Amazon and Essequibo basins in western Guiana. Corymbophanes ameliae sp. nov. is distinguished by having vermiculations on the abdomen, bands on the caudal fin, the anal fin i,5 and narrow caudal peduncle. Yaluwak primus gen. &amp; sp. nov. is distinguished by having evertible cheek odontodes, a plated snout, a tall caudal peduncle and absence of adipose fin and iris operculum. We present a new molecular phylogenetic analysis inclusive of these and several related genera that suggests that the Corymbophanes clade (Araichthys, Corymbophanes, Cryptancistrus, Guianancistrus, Hopliancistrus and Yaluwak) originated in the Guiana Shield with secondary dispersal to the Brazilian Shield. Within the Guiana Shield, relationships among Corymbophanes and Yaluwak are consistent with geodispersal between drainages via headwater capture, although an uplift-mediated relictual distribution cannot be ruled out. ND2 haplotype structure among C. ameliae populations suggests that ichthyofaunal diversity on the Guiana Shield escarpment is shaped not only by inter-, but also intrafluvial barriers to gene flow.<br><strong>KEYWORDS:<\/strong> Amaila Falls \u2013 Amazonian Craton \u2013 Guianas \u2013 Ireng River \u2013 Kuribrong River \u2013 Rio Ma\u00fa \u2013 Potaro River \u2013 sexual dimorphism.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">INTRODUCTION<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Eigenmann (1909) described the genus and species Corymbophanes andersoni based on a single specimen (FMNH 52675) collected in the upper Potaro River basin above Kaieteur Falls in what was then British Guiana (now Guiana; Fig. 1). Eigenmann\u2019s collections above Kaieteur were the culmination of a landmark 1908 ichthyofaunal survey of Guiana; an expedition whose many discoveries were more fully detailed in a subsequent monograph (Eigenmann, 1912). Eigenmann (1909) described C. andersoni as being primarily distinguished from other loricariids by lacking an adipose fin and instead having \u2018a low median ridge extending from the tip of the dorsal to the caudal\u2019 and \u2018no externally visible occipital crest\u2019 (Eigenmann, 1912: 5). In 1912, he provided the first illustrations of C. andersoni, but otherwise did not expand on his original description, adding only that C. andersoni \u2018differs from Plecostomus [now Hypostomus] in trifling characters only\u2019 (Eigenmann, 1912: 103). Like Hypostomus, Corymbophanes is distinguished from most other members of subfamily Hypostominae by lacking evertible cheek odontodes. Because of this similarity to Hypostomus \u2013 a genus known to be widespread in South America \u2013 Eigenmann hypothesized that Corymbophanes may only be \u2018a local modification of a comparatively recent immigrant to the [Guiana Shield] plateau\u2019 (ibid.).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ninety years after Eigenmann\u2019s expedition to the upper Potaro River, one of us (JWA) participated<br>in an expedition to resample many of the same sites as Eigenmann, with results of this temporal<br>comparison being summarized by Hardman et al. (2002). In addition to collecting five new specimens of<br>C. andersoni from its type locality at Chenapou Falls (known to Eigenmann in 1908 as Aruataima Falls)<br>in the Potaro River main channel, members of this expedition collected five specimens of a new congener<br>from the nearby Oung Creek (Fig. 1: OC). This new species, Corymbophanes kaiei Armbruster &amp; Sabaj<br>2000, differs from C. andersoni by having a dark brown abdomen with white vermiculations (vs. mostly white), white vermiculations on the sides (vs. spots) and by having three to four plates beneath the adpressed pectoral-fin spine (vs. five; Armbruster et al., 2000).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Interpretation of the phylogenetic and biogeographical history of Corymbophanes changed<br>with Armbruster\u2019s (2004) morphology-based phylogenetic analysis of the Hypostominae. Armbruster<br>found Corymbophanes to be monophyletic, diagnosed by 11 non-unique synapomorphies, and sister to<br>all other members of the Hypostominae, including Hypostomus. Corymbophanes was, therefore, placed<br>in its own tribe Corymbophanini. This interpretation of the phylogenetic placement of Corymbophanes held until the first comprehensive molecular phylogenetic analysis of Hypostominae (Lujan et al., 2015), which again dramatically changed our understanding of relationships within this subfamily. Both Lujan et al. (2015) and Fisch-Muller et al. (2018), using different sets of markers, found Corymbophanes to be nested within the Hypostominae tribe Ancistrini and to be well supported as sister to either the Guiana Shield endemic species Cryptancistrus similis (Fisch-Muller et al., 2018) or the Brazilian Shield endemic genus Hopliancistrus [according to Lujan et al. (2015) who did not examine Cr. similis]. Together, the clade of either Corymbophanes + Hopliancistrus (Lujan et al., 2015) or Hopliancistrus + (Corymbophanes + Cryptancistrus) (Fisch-Muller et al., 2018) was sister to the genus Guianancistrus, which is distributed across large lowland rivers of the eastern Guiana Shield in north-eastern Brazil, French Guiana and Suriname (Cardoso &amp; Montoya-Burgos, 2009; Covain &amp; Fisch- Muller, 2012). Problematically, Corymbophanes lacks the evertible cheek odontode mechanism of most other members of Ancistrini, but that mechanism has likely been reduced or lost at least four times within Hypostominae (Armbruster, 2004; Lujan et al., 2015). These taxa formed a largely Guiana Shieldrestricted clade within which the evertible cheek odontode mechanism is highly variable, being absent in Corymbophanes, modified into a three-hooked, anteriorly highly evertible pinching mechanism in Hopliancistrus and present but unspecialized in Cryptancistrus and Guianancistrus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Acesse o artigo completo gratuitamente:<\/p>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-7895d792-d7e5-4543-b764-580e2c7851d1\" href=\"https:\/\/clam.olyva.com.br\/wp-content\/uploads\/2024\/04\/Phylogeny-and-biogeography-of-the-Brazilian%E2%80%93GuianaShield-endemic-Corymbophanes-clade-of-armouredcatfishes-Loricariidae.pdf\">Phylogeny-and-biogeography-of-the-Brazilian\u2013GuianaShield-endemic-Corymbophanes-clade-of-armouredcatfishes-Loricariidae<\/a><a href=\"https:\/\/clam.olyva.com.br\/wp-content\/uploads\/2024\/04\/Phylogeny-and-biogeography-of-the-Brazilian%E2%80%93GuianaShield-endemic-Corymbophanes-clade-of-armouredcatfishes-Loricariidae.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-7895d792-d7e5-4543-b764-580e2c7851d1\">Baixar<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Numerous rivers, interrupted by large waterfalls and extensive rapids, drain the geologically ancient Guiana Shield Highlands. We describe a new armoured catfish genus and two new species endemic to the upper Ireng and Kuribrong rivers, respective tributaries of the Amazon and Essequibo basins in western Guiana. Corymbophanes ameliae sp. nov. is distinguished by having vermiculations [&hellip;]<\/p>\n","protected":false},"author":81,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_ppma_block_editor_authors":"","_links_to":"","_links_to_target":""},"categories":[353],"tags":[],"ppma_author":[1282],"class_list":["post-7972","post","type-post","status-publish","format-standard","hentry","category-artigos"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae) - Clam<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/clam.com.br\/en\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae) - Clam\" \/>\n<meta property=\"og:description\" content=\"Numerous rivers, interrupted by large waterfalls and extensive rapids, drain the geologically ancient Guiana Shield Highlands. We describe a new armoured catfish genus and two new species endemic to the upper Ireng and Kuribrong rivers, respective tributaries of the Amazon and Essequibo basins in western Guiana. Corymbophanes ameliae sp. nov. is distinguished by having vermiculations [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/clam.com.br\/en\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\/\" \/>\n<meta property=\"og:site_name\" content=\"Clam\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/clamsustentabilidade\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-26T14:49:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-28T01:31:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/clam.com.br\/wp-content\/uploads\/2025\/12\/clam-sustentabilidade.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"450\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"T\u00falio Teixeira\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"T\u00falio Teixeira\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/\"},\"author\":{\"name\":\"T\u00falio Teixeira\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/#\\\/schema\\\/person\\\/c7b77746d07c85b2c368934590133e11\"},\"headline\":\"Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae)\",\"datePublished\":\"2024-04-26T14:49:23+00:00\",\"dateModified\":\"2025-10-28T01:31:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/\"},\"wordCount\":814,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/clam.com.br\\\/#organization\"},\"articleSection\":[\"Artigos\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/\",\"url\":\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/\",\"name\":\"Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae) - Clam\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/clam.com.br\\\/#website\"},\"datePublished\":\"2024-04-26T14:49:23+00:00\",\"dateModified\":\"2025-10-28T01:31:50+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/en\\\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"In\u00edcio\",\"item\":\"https:\\\/\\\/clam.com.br\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/#website\",\"url\":\"https:\\\/\\\/clam.com.br\\\/\",\"name\":\"Clam\",\"description\":\"Consultoria especializada em iniciativas integradas para gest\u00e3o ambiental, sustentabilidade e ESG. Com base em metodologias reconhecidas e ferramentas tecnol\u00f3gicas, a Clam atua em toda a jornada de Licenciamento Ambiental e ESG, orientando decis\u00f5es estrat\u00e9gicas com foco em oportunidades, riscos e gera\u00e7\u00e3o de valor a longo prazo.\",\"publisher\":{\"@id\":\"https:\\\/\\\/clam.com.br\\\/#organization\"},\"alternateName\":\"Sustentabilidade corporativa\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/clam.com.br\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/#organization\",\"name\":\"Clam\",\"alternateName\":\"Sustentabilidade\",\"url\":\"https:\\\/\\\/clam.com.br\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/clam.com.br\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/logo-clam.svg\",\"contentUrl\":\"https:\\\/\\\/clam.com.br\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/logo-clam.svg\",\"width\":175,\"height\":52,\"caption\":\"Clam\"},\"image\":{\"@id\":\"https:\\\/\\\/clam.com.br\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/clamsustentabilidade\",\"https:\\\/\\\/www.instagram.com\\\/clamsustentabilidade\\\/\",\"https:\\\/\\\/www.youtube.com\\\/@clamsustentabilidade\",\"https:\\\/\\\/www.linkedin.com\\\/company\\\/clamsustentabilidade\\\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/#\\\/schema\\\/person\\\/c7b77746d07c85b2c368934590133e11\",\"name\":\"T\u00falio Teixeira\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/clam.com.br\\\/wp-content\\\/uploads\\\/2024\\\/05\\\/Tulio_Teixeira.jpg4aedc0dfdb0586e9c0c578d5defe89fe\",\"url\":\"https:\\\/\\\/clam.com.br\\\/wp-content\\\/uploads\\\/2024\\\/05\\\/Tulio_Teixeira.jpg\",\"contentUrl\":\"https:\\\/\\\/clam.com.br\\\/wp-content\\\/uploads\\\/2024\\\/05\\\/Tulio_Teixeira.jpg\",\"caption\":\"T\u00falio Teixeira\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae) - Clam","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/clam.com.br\/en\/phylogeny-and-biogeography-of-the-brazilian-guianashield-endemic-corymbophanes-clade-of-armouredcatfishes-loricariidae\/","og_locale":"en_US","og_type":"article","og_title":"Phylogeny and biogeography of the Brazilian \u2013 Guiana Shield endemic Corymbophanes clade of armoured catfishes (Loricariidae) - Clam","og_description":"Numerous rivers, interrupted by large waterfalls and extensive rapids, drain the geologically ancient Guiana Shield Highlands. We describe a new armoured catfish genus and two new species endemic to the upper Ireng and Kuribrong rivers, respective tributaries of the Amazon and Essequibo basins in western Guiana. 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