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Sunday, April 7th, 2024
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| 8:12a | [Ichthyology • 2024] Monotocheirodon duda • A New characid Species with remarkable sexual dimorphism (Characiformes: Characidae: Stevardiinae) from the upper Guayabero River, Orinoco Basin, Colombia
Abstract A new species of characid with remarkable sexual characteristics is described from the upper Guayabero River drainage from the Orinoco basin in Colombia. The new species is included in the genus Monotocheirodon by sharing most of the previously proposed diagnostic features of this genus. It differs from all Stevardiinae by the combination, in adult males, of an enlarged urogenital papilla in contact with the first anal-fin unbranched ray and a highly modified anal fin with enlarged and distally elongated first and second branched anal-fin rays, forming a gonopodium-like structure. In addition, it differs from congeners by the presence of an adipose fin, an incomplete lateral line, an ascending process of the premaxilla dorsally oriented, and a long snout. The new species was discovered from a poorly sampled region in Colombia and is an unexpected new record given its disjunct geographic distribution from other species of the genus. Monotocheirodon species were previously known from piedmont drainages in Bolivia and Peru. The conservation status of the new species is herein categorized following IUCN criteria. Keywords: endemism, insemination, Monotocheirodon, sexual characters, South America, species diversity
Monotocheirodon duda, new species Diagnosis: The new species differs from all Stevardiinae species by the combined presence in adult males of an enlarged urogenital papilla (length about one-third to half of the first unbranched ray), which is in contact with the first anal-fin unbranched ray and a highly modified anal fin, with enlarged (anteroposteriorly) and distally elongated first and second branched anal-fin rays, forming a gonopodium-like structure (Figure 2). The new species differs from all other species of Monotocheirodon by the presence of an adipose fin (Figure 1, vs. absent); lateral line incomplete, pored scales not reaching the caudal fin (vs. lateral line complete); ascending process of the premaxilla dorsally directed (Figure 3, vs. strongly bent posteroventrally); and a longer snout that occupies about a fourth of the head length (HL), between 23.1% and 30.0% of HL (vs. short snout, <20% of the HL). Etymology: Monotocheiron duda is named after the river where the new species was captured, mostly tributaries to the Duda River or captured in the Duda River itself (type locality). In Spanish, the epithet specific “duda” means doubt, which also refers to its presumed placement into the genus Monotocheirodon, an assumption that needs further evaluation. Tiago P. Carvalho, Andréa Tonolli Thomaz, Alexander Urbano-Bonilla and Saúl Prada-Pedreros. 2024. A New characid Species with remarkable sexual dimorphism (Characiformes: Characidae: Stevardiinae) from the upper Guayabero River, Orinoco basin, Colombia. Journal of Fish Biology. DOI: 10.1111/jfb.15738 | ||||
| 3:14p | [Botany • 2024] Mollinedia lorencei (Laurales: Monimiaceae) • A New Species endemic to the Atlantic Forest in the State of Bahia, Brazil
Abstract We provide a description and illustration of Mollinedia lorencei, sp. nov. The species exhibits morphological similarities and is compared to both M. lamprophylla and M. dolichotricha. Furthermore, we provide comments on the taxonomy, ecology, geographic distribution and conservation status of this new species. Keywords: Flora of Bahia, Flora of Brazil, Mollinedia lorencei, Mollinedieae, Mollinedioideae, new taxon, taxonomy, threatened species   Mollinedia lorencei Borges-Lima, Zavatin & Lírio, sp. nov. Lucas Borges de Lima, Danilo Alvarenga Zavatin, Ariane Luna Peixoto, Paulo Takeo Sano and Elton John de Lírio. 2024. Mollinedia lorencei (Monimiaceae, Laurales), A New Species endemic to the Atlantic Forest in the State of Bahia, Brazil. Nordic Journal of Botany. DOI: 10.1111/njb.04248 twitter.com/NordicJBotany/status/1772611924858953934 | ||||
| 4:14p | [Botany • 2024] Dryopteris jinpingensis (Dryopteridaceae) • A Critically Endangered Diploid New Species from Yunnan, China
Abstract Dryopteris jinpingensis, a new species of diploid, sexually reproductive ferns of Dryopteridaceae from Yunnan, southwestern China, is described and illustrated. Morphologically, D. jinpingensis is similar to D. gaoligongensis but unique in elongated lanceolate laminae, sessile or subsessile pinna stalks, and overlapping membranous scales adnate to stipe base. Phylogenetic analyses based on both plastome and the nuclear AK1 gene sequences showed that D. jinpingensis is sister to D. gaoligongensis. A detailed taxonomic description with line drawings is provided, and its conservation status is evaluated to be critically endangered. Key words: Dryopteris sect. Diclisodon, molecular phylogeny, new species, sexual diploid
Dryopteris jinpingensis Z.Y.Zuo, Jin Mei Lu & D.Z.Li, sp. nov. 金平鳞毛蕨 (jīn píng lín máo jué) Diagnosis: Dryopteris jinpingensis is similar to D. gaoligongensis with stout and creeping rhizome, 3- to 4-pinnate large frond, and largest and longest basal basiscopic pinnule. However, D. jinpingensis differs from it in the elongated lanceolate lamina, sessile or subsessile pinna stalks (less than 1 cm), and overlapping membranous and thin scales adnate to stipe base. Etymology: The specific epithet “jinpingensis” refers to its type locality, Jinping County, in the border between south Yunnan of China and Vietnam. Zheng-Yu Zuo, Jin-Mei Lu, Cun-Fu Li, De-Zhu Li. 2024. Dryopteris jinpingensis, A Critically Endangered Diploid New Species of Dryopteridaceae from Yunnan, China. PhytoKeys. 239: 195-204. DOI: 10.3897/phytokeys.239.118655 |
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