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Tuesday, May 10th, 2022
| Time | Event | ||||||
| 4:26p | [Paleontology • 2022] Peruvispira kanchanaburiensis • A Low-diversity Peruvispira-dominated Gastropod Assemblage from the Permian Ratburi Group of Central Thailand
Abstract Permian gastropods from Thailand have been extensively studied over the last few years. The earliest known fossil collection was recovered in 1967 but has never been figured or described. Here, we document this historically important gastropod assemblage excavated from the upper-Lower to Middle Permian Ratburi Group of Khao Mang Lat in the Ban Kao District of Kanchanaburi Province, Central Thailand. The material comprises approximately 200 specimens, almost all of which represent a new species, Peruvispira kanchanaburiensis sp. nov. (Goniasmatidae), together with a single individual of Orthonychia sp. (Orthonychiidae = Platyceratidae). This exceptionally low-diversity community is unusual in comparison to Permian gastropod faunas reported from elsewhere, and could reflect either a low temperature palaeoenvironmental setting or priority effects resulting from early establishment of planktotrophic larvae within the local habitat. Keywords: Gastropoda, Platyceratidae, diversity, Kanchanaburi, Sibumasu Terrane  Peruvispira kanchanaburiensis Baran Karapunar, Alexander Nützel and Chatchalerm Ketwetsuriya. 2022. A Low-diversity Peruvispira-dominated Gastropod Assemblage from the Permian Ratburi Group of Central Thailand. Alcheringa: An Australasian Journal of Palaeontology. DOI: 10.1080/03115518.2022.2050814 | ||||||
| 4:27p | [Herpetology • 2022] Calyptommatus frontalis • Morphological Variation and Genealogical Discordance in Caatinga Sand Lizards Calyptommatus Rodrigues 1991 (Squamata: Gymnophthalmidae) with the Description of A New Species
Abstract In the last decades, a remarkable fauna of psammophilous and fossorial squamates was discovered in sandy habitats of the semiarid Caatinga of northeast Brazil. Despite the increasing accumulation of genetic data from this unique fauna, an incomplete knowledge of its diversity still hampers a better understanding of its origins and diversification. The fossorial lizard genus Calyptommatus (Gymnophthalmidae) is endemic to sandy habitats of the Caatinga, being currently represented by four allopatric species. In this study, we used morphological and molecular data to assess population-level variation in Calyptommatus. We found a new morphotype of Calyptommatus from the state of Bahia, Brazil, readily distinguished from congeners by the presence of a frontal scale. Morphological, nuDNA and geographic data support the recognition of a new species herein described as Calyptommatus frontalis sp. nov. Nevertheless, genetic data revealed mito-nuclear+morphology discordance, with populations with frontal scales distributed in three distantly related mtDNA clades, suggesting either potential historical and/or current introgressions or incomplete lineage sorting. Further data are needed to clarify the status of the two other mtDNA clades displaying a frontal scale. · Keywords: Reptilia, Caatinga, contact zone, endemism, phylogeny, reptiles, taxonomy
 Renato Sousa Recoder, Sergio Marques-Souza, Thiago Silva-Soares, Carolina Nisa Ramiro, Thiago Marcial Castro and Miguel Trefaut Rodrigues. 2022. Morphological Variation and Genealogical Discordance in Caatinga Sand Lizards Calyptommatus Rodrigues 1991 (Squamata: Gymnophthalmidae) with the Description of A New Species. Zootaxa. 5129(3); 374-398. DOI: 10.11646/zootaxa.5129.3.3  | ||||||
| 4:28p | [Invertebrate • 2022] Sepioloidea jaelae & S. virgilioi • Two New ‘Bottletail Squids’ (Cephalopoda: Sepiadariidae: Sepioloidea) from New Zealand, with New Observations on Sepioloidea pacifica (Kirk, 1882)
Abstract Members of the cephalopod family Sepiadariidae Fischer, 1882, commonly called ‘bottletail squids’, are known primarily from the Indo-Pacific and southwest Pacific. To date, only one species is known to occur in New Zealand waters: Sepioloidea pacifica (Kirk, 1882). However, researchers have long suspected the presence of additional species in the genus Sepioloidea d’Orbigny, 1845 in Férussac & d’Orbigny 1835-1848. The majority of known Sepioloidea material from New Zealand national collections was examined; both morphological and, where available, molecular characters are compared. As a result, two new species, Sepioloidea virgilioi sp. nov. and Sepioloidea jaelae sp. nov., are recognised and described. Diagnostic morphological characters include the tentacular club sucker arrangement and hectocotylus structure. Molecular data support the recognition of these two new taxa, with sampled populations of each of the three available Sepioloidea falling within three monophyletic clades following analysis of COI (cytochrome c oxidase subunit I) sequence data. The minimum interspecific distance is 11.09%—far greater than the maximum intraspecific distance (1.57%). A revised diagnosis for S. pacifica sensu stricto is also provided. Keywords: Sepiolida, Taxonomy, Southwest Pacific, DNA barcode, COI
Sepioloidea virgilioi sp. nov. Sepioloidea jaelae sp. nov. Jaever M. Santos, Kathrin S. R. Bolstad and Heather E. Braid. 2022. Two New ‘Bottletail Squids’ (Cephalopoda: Sepiadariidae: Sepioloidea) from New Zealand, with New Observations on Sepioloidea pacifica (Kirk, 1882). Marine Biodiversity. 52: 26. DOI: 10.1007/s12526-021-01247-z Deep dark dumplings: Two new bottletail squids from New Zealand |
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