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Thursday, June 12th, 2025
| Time | Event | ||||||||
| 7:00a | [Ichthyology • 2023] Kentrocapros flavimaculatus • A New Boxfish of the Genus Kentrocapros (Tetraodontiformes: Aracanidae) collected from New Zealand
Abstract A new boxfish, Kentrocapros flavimaculatus, is described on the basis of two specimens collected from New Zealand. The new species is distinguished from all other species of Kentrocapros by the following combination of characters: many yellow spots on the lateral sides of the body, a distinct spine on the middle of each dorsolateral ridge of the carapace, no spines on the lateral and ventrolateral ridges, and the gill opening located below the posterior half of the eye. Key words: boxfish, taxonomy, Kentrocapros flavimaculatus, distribution. 
Kentrocapros flavimaculatus n. sp. Keiichi Matsuura. 2023. A New Boxfish of the Genus Kentrocapros collected from New Zealand (Acanthopterygii, Tetraodontiformes, Aracanidae). Bull. Natl. Mus. Nat. Sci., Ser. A, 49(4); 191–196. DOI: doi.org/10.50826/bnmnszool.49.4_191 [November 22, 2023 ] | ||||||||
| 7:00a | [Botany • 2024] Epidendrum manusalinasiae (Orchidaceae: Laeliinae) • New Species from the high Andean Forests of Manu National Park, Cusco, Perú
Abstract We describe and illustrate a new species of Epidendrum from the high Andean forests of Manu National Park, Cusco. Epidendrum manusalinasiae belongs the Saxicola group. Information on its distribution, habitat, phenology, and conservation status is provided. The new species is compared with E. churubambense, E. herreranum and E. tetartociclium from which it is distinguished by having leaves elliptic to widely elliptic, flowers pale yellow to green, sepals sometimes tinged red-brown, column and calli creamy yellow, lip disc with large, fleshy thickened, forming wide cordiform platform, wider than mid-lobe and reaching its base and mid-lobe whit distal portion plicated forward, whit a sub-lobed appearance in natural position. Epidendrum diversity, Kosñipata, Saxicola group, taxonomy, Monocots
Epidendrum manusalinasiae L.E.Alfaro, J.Duarte & Hágsater
Lucero E. ALFARO, Julian Duarte SALINAS, Eric HÁGSATER and Asunción CANO. 2024. Epidendrum manusalinasiae (Orchidaceae: Laeliinae), New Species from the high Andean Forests of Manu National Park, Cusco, Perú. Phytotaxa. 664(1); 68-74. DOI: doi.org/10.11646/phytotaxa.664.1.6 [2024-09-03] | ||||||||
| 10:42a | [Paleontology • 2025] Khankhuuluu mongoliensis • A new Mongolian tyrannosauroid and the Evolution of Eutyrannosauria
Abstract Eutyrannosaurians were large predatory dinosaurs that dominated Asian and North American terrestrial faunas in latest Cretaceous times. These apex predators arose from smaller-bodied tyrannosauroids during the ‘middle’ Cretaceous that are poorly known owing to the paucity of fossil material. Here we report on a new tyrannosauroid, Khankhuuluu mongoliensis gen. et sp. nov., from lower Upper Cretaceous deposits of Mongolia that provides a new perspective on eutyrannosaurian origins and evolution. Phylogenetic analyses recover Khankhuuluu immediately outside Eutyrannosauria and recover the massive, deep-snouted Tyrannosaurini and the smaller, gracile, shallow-snouted Alioramini as highly derived eutyrannosaurian sister clades. Khankhuuluu and the late-diverging Alioramini independently share features related to a shallow skull and gracile build with juvenile eutyrannosaurians, reinforcing the key role heterochrony had in eutyrannosaurian evolution. Although eutyrannosaurians were mainly influenced by peramorphosis or accelerated growth, Alioramini is revealed as a derived lineage that retained immature features through paedomorphosis and is not a more basal lineage as widely accepted. Our results reveal that Asian tyrannosauroids (similar to Khankhuuluu) dispersed to North America, giving rise to Eutyrannosauria in the mid-Late Cretaceous. Eutyrannosauria diversified and remained exclusively in North America until a single dispersal to Asia in the latest Cretaceous that established Alioramini and Tyrannosaurini. Stark morphological differences between Alioramini and Tyrannosaurini probably evolved due to divergent heterochronic trends—paedomorphosis versus peramorphosis, respectively—allowing them to coexist in Asia and occupy different ecological niches.    Khankhuuluu mongoliensis gen. et sp. nov.  Jared T. Voris, Darla K. Zelenitsky, Yoshitsugu Kobayashi, Sean P. Modesto, François Therrien, Hiroki Tsutsumi, Tsogtbaatar Chinzorig and Khishigjav Tsogtbaatar. 2025. A new Mongolian tyrannosauroid and the Evolution of Eutyrannosauria. Nature. DOI: doi.org/10.1038/s41586-025-08964-6 [11 June 2025] | ||||||||
| 2:09p | [Paleontology • 2025] Diverse Dinosaur Tracks from the Upper Jurassic – Lower Cretaceous Chacarilla Formation of Quebrada de Arcas, northeast Chile: Evidence of high ichnodiversity in an arid palaeoenviroment
Highlights: • New track-bearing surfaces are found in the Chacarilla Fm. in Quebrada des Arca. • Five morphotypes: one of sauropod and four for different size theropod tracks are defined. • Huge theropod tracks have been found and identified. Abstract We report diverse dinosaur tracks from siltstone to fine-grained sandstone facies of the Chacarilla Formation, Quebrada de Arcas of northeast Chile. Track-bearing surfaces were studied using 3D modelling and false-colour depth maps, derived from UAV photographs. Five morphotypes are identified based on morphology and morphometric criteria. Morphotype I comprises rounded tracks with a consistent narrow-gauge and resembles the sauropod ichnogenus, Parabrontopodus; diplodocids or titanosaurids are probable trackmakers. Morphotype II is assigned to the theropod ichnotaxon Abelichnus astigerrae and comprises some of the largest theropod tracks ever recorded from South America with a maximum footprint length of 51 cm; the trackmaker was most likely a large carcharodontosaurid, such as Giganotosaurus carolinii. Morphotype III is an indeterminate theropod track, which shows a distinctive and prominent metatarsal impression, but does not closely match any ichnotaxon although it bears some morphometrical affinity to Changpeipus carbonicus. The Morphotypes IV and V both belong to small-sized theropod trackmakers, and resemble Grallatoridae and Kayentapus-like forms, respectively. Additional theropod material cannot be assigned to specific morphotypes or trackmakers, due to poor preservation. Our findings show the existence of three distinct size classes (small, medium and large) of theropod morphotypes and point to a high ichnodiversity at the Jurassic-Cretaceous transition in the subtropical arid environments of Gondwana. Keywords: Dinosaur tracks, Abelichnus astigerrae, Chacarilla Formation, Gondwana, Jurassic-Cretaceous boundary
Vincenzo Gesualdi, Matteo Belvedere, Marko Yurac, Dorothee Hippler, Nejla Hurem, Christian Salazar, Javiera Mendez and Christian A. Meyer. 2025. Diverse Dinosaur Tracks from the Upper Jurassic – Lower Cretaceous Chacarilla Formation of Quebrada de Arcas, northeast Chile: Evidence of high ichnodiversity in an arid palaeoenviroment. Palaeogeography, Palaeoclimatology, Palaeoecology. 113088; In Press. DOI: doi.org/10.1016/j.palaeo.2025.113088 [9 June 2025] |
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