Topic
Microdon
About: Microdon is a research topic. Over the lifetime, 123 publications have been published within this topic receiving 1983 citations.
Papers published on a yearly basis
Papers
TL;DR: The relations of the giraffoids are assessed by methods of phylogenetic systematics and it is suggested that 'Palaeotragus' expectans and 'Palaelophrys' decipiens are closely related to Samotherium.
Abstract: Specimens of Climacoceras africanus are described from Maboko, Kenya. The new species Climacoceras gentryi is established on the basis of ossicones, mandibles, and upper and lower dentitions from Fort Ternan and Baringo, Kenya. By interpretation of its lower canines Climacoceras is identified as a giraffoid and is placed in the new family Climacoceridae. Canthumeryx sirtensis is identified from Muruarot and Rusinga, Kenya. A dentition and associated partial skeleton of this species are described. The teeth agree closely with specimens of the same species from Gebel Zelten, Libya. Zarafa zelteni from Gebel Zelten is synonymized with Canthumeryx sirtensis. Again on the basis of its lower canines Canthumeryx is identified as a giraffoid and is placed in the new family Canthumerycidae. Specimens of Palaeotragus primaevus are described from Baringo, Kenya. This material includes a cranium with the ossicones, skull roof, occipital and basicranial regions preserved. Palaeotragus primaevus specimens from Fort Ternan are used in this description and some of these are redescribed. The relations of the giraffoids are assessed by methods of phylogenetic systematics. Palaeomeryx, Prolibytherium and Propalaeoryx are excluded from the Giraffoidea as their lower canines are not known. The Palaeotraginae is shown to be an invalid polyphyletic grouping and the genus Palaeotragus is also shown to be polyphyletic. Palaeotragus microdon is probably synonymous with Palaeotragus rouenii and the three species Palaeotragus rouenii (P. microdon), Palaeotragus coelophrys and Palaeotragus quadricornis are retained in the genus Palaeotragus. It is suggested that 'Palaeotragus' expectans and 'Palaeotragus' decipiens are closely related to Samotherium. Palaeotragus primaevus is probably synonymous with Palaeotragus tungurensis and this species is closely related to the giraffines. With slight changes the subfamilies Sivatheriinae and Giraffinae are valid monophyletic groups. Hydaspitherium is synonymized with Bramatherium and the Sivatheriinae includes the genera Giraffokeryx, Birgerbohlinia, Bramatherium and Sivatherium while the Giraffinae includes the genera Honanotherium, Bohlinia and Giraffa and the species 'Palaeotragus' tungurensis (P. primaevus). Okapia is identified as the sister-group of the other giraffids. Triceromeryx is the sister-group of the Giraffidae. Canthumeryx is the sister-group of Triceromeryx plus the Giraffidae while Climacoceras is the sister-group of the other giraffoids.
137 citations
TL;DR: The utility of acoustic telemetry in monitoring P. microdon in a riverine environment is demonstrated and the need to consider the habitat requirements of different P.microdon cohorts in the strategic planning of natural resources will aid the development of management strategies for this species.
Abstract: The freshwater sawfish (Pristis microdon) is a critically endangered elasmobranch. Ontogenetic changes in the habitat use of juvenile P. microdon were studied using acoustic tracking in the Fitzroy River, Western Australia. Habitat partitioning was significant between 0+ (2007 year class) and larger 1+ (2006 year class) P. microdon. Smaller 0+ fish generally occupied shallower water ( 0.6 m. Significant differences in hourly depth use were also revealed. The depth that 1+ P. microdon occupied was significantly influenced by lunar phase with these animals utilising a shallower and narrower depth range during the full moon compared with the new moon. This was not observed in 0+ individuals. Habitat partitioning was likely to be related to predator avoidance, foraging behaviours, and temperature and/or light regimes. The occurrence of 1+ P. microdon in deeper water may also result from a need for greater depths in which to manoeuvre. The present study demonstrates the utility of acoustic telemetry in monitoring P. microdon in a riverine environment. These results demonstrate the need to consider the habitat requirements of different P. microdon cohorts in the strategic planning of natural resources and will aid in the development of management strategies for this species.
75 citations
TL;DR: A new species of hoverflies of the subfamily Microdontinae was identified in Northeast China, including one new to science, Microdon dentigiganteum sp.
Abstract: Hoverflies (Diptera: Syrphidae) of the subfamily Microdontinae were surveyed in Northeast China. A total of six species were identified, including one new to science, Microdon dentigiganteum sp. nov. from Liaoning. This new species has a pair of very large-size posterior calcars on the scutellum and very wide flat tarsi. New records of Metadon spuribifasciatus (Huo, Ren et Zheng, 2007), Microdon analis (Macquart, 1842) and Microdon auricomus Coquillett, 1898 from Jilin province, and Microdon ignotus Violovitsh, 1976 and Microdon oitanus Shiraki, 1930 from Liaoning province are provided. A key to the six studied species and diagnostic figures are presented.
69 citations
TL;DR: Although several species-level taxa were identified based on multiple, independent data sets, it is recommended a conservative approach which will involve thorough analyses of museum specimens including material from type localities together with additional sampling and data from multiple, nuclear gene markers.
68 citations
TL;DR: Since female migration (replenishment) between regions is unlikely, conservation plans should strive to maintain current levels of diversity and abundances in the regional assemblages of each species.
Abstract: Northern Australia is considered to be one of the last strongholds for three critically endangered sawfishes, Pristis zijsron, Pristis clavata, and Pristis microdon, making these populations of global significance. Population structure and levels of genetic diversity were assessed for each species across northern Australia using a portion of the mitochondrial control region. Statistically significant genetic structure was detected in all three species, although it was higher in P. microdon (FST = 0.811; N = 149) than in either P. clavata (FST = 0.419; N = 73) or P. zijsron (FST = 0.202; N = 49), possibly due to a much higher and/or localized level of female philopatry in P. microdon. The overall levels of haplotype diversity in P. zijsron (h = 0.555), P. clavata (h = 0.489), and P. microdon (h = 0.650) were moderate, although it appears to be reduced in the assemblages of P. zijsron and P. clavata in the Gulf of Carpentaria (h = 0.342 and h = 0.083, respectively). Since female migration (replenishment) between regions is unlikely, conservation plans should strive to maintain current levels of diversity and abundances in the regional assemblages of each species.
67 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 3 |
| 2020 | 1 |
| 2019 | 7 |
| 2017 | 3 |
| 2016 | 2 |
| 2015 | 3 |