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Monday, April 23rd, 2018
| Time | Event | ||
| 1:46a | [Ichthyology • 2018] Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with Descriptions of Two New Species; Gymnotus eyra & G. riberalta
Abstract Banded Knifefishes (Gymnotus, Gymnotidae) comprise the most species-rich genus of Neotropical electric fishes, with 41 species currently described from throughout the humid Neotropics, from Mexico to Argentina. Despite substantial alpha-taxonomic work in recent years, the diversity of Gymnotus in some regions remains poorly understood. Here we describe the Gymnotus fauna of the Upper Madeira basin of Bolivia and Peru from examination of more than 240 adult specimens. Species are delimited and described using body proportions (traditional morphometrics), fin-ray, squamation and laterosensory-pore counts (meristics), quantitative shape differences (geometric morphometrics), osteological traits, and color patterns. Comparisons of standardized linear measures as well as multivariate statistical methods validate the presence in the Upper Madeira basin of three previously described species, two with wide-spread geographic distributions throughout Greater Amazonia (G. carapo and G. coropinae), and one (G. chaviro) endemic to southwestern Amazonia. We also diagnose and describe two new species that are endemic to the Upper Madeira basin: G. eyra n. sp., morphologically most similar to G. mamiraua from lowland Amazonia, and G. riberalta n. sp., morphologically most similar to G. pantanal from the Paraguay-Paraná basin. The five Gymnotus species from the Upper Madeira basin are not monophyletic, each species being more closely related to a different species from another region; i.e. the Gymnotus species from the Upper Madeira represents a polyphyletic assemblage. These descriptions to 43 the number of valid Gymnotus species. Keywords: Pisces, Alpha taxonomy, biodiversity assessment, neotropical, species delimitation  Jack M. Craig, Vanessa Correa-Roldán, Hernán Ortega, William G. R. Crampton and James S. Albert. 2018. Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with Descriptions of Two New Species. Zootaxa. 4413(1); 111–132.  | ||
| 2:03a | [Botany • 2018] Three New Species of Begonia (section Baryandra, Begoniaceae) from Luzon Island, the Philippines; Begonia droseroides, B. gabaldonensis & B. madulidii
Abstract Luzon is the largest island of the Philippines, and because of its isolation from other landmasses it has developed a unique diversity of flora and fauna. Included in this rich biodiversity of flora are members of genus Begonia of the family Begoniaceae. In a joint expedition to the island, botanists from Taiwan and the Philippines found three unknown Begonia species and compared them with potentially allied species. The three species are clearly members of Begonia section Baryandra. Studies of literature, herbarium specimens, and living plants support the recognition of the three new species: Begonia droseroides, B. gabaldonensis, and B. madulidii. This brings the total of Begonia species in section Baryandra to sixty-eight, of which 85.3% are endemic to the Philippines. Keywords: sect. Baryandra, endemic, Luzon, Eudicots       Rosario R. Rubite, Ching-I Peng, Kuo-Fang Chung, Che-Wei Lin, Luisito T. Evangelista, Danilo N. Tandang, John Rey C. Callado and Mark Hughes. 2018. Three New Species of Begonia (section Baryandra, Begoniaceae) from Luzon Island, the Philippines. Phytotaxa. 347(3); 201-212. DOI: 10.11646/phytotaxa.347.3.1  |
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