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Friday, November 12th, 2021
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| 12:00a | [Botany • 2021] The Genus Phaeanthus (Annonaceae: Miliuseae) in Thailand: P. piyae sp. nov. and Resurrection of P. lucidus, with Molecular Phylogenetic Analyses
Abstract Phaeanthus piyae, a new species from southern Thailand, is described and illustrated. It is morphologically most similar to P. intermedius, which occurs in Peninsular Malaysia, Singapore, Riau Islands, and Sumatra. The new species can be distinguished from P. intermedius by the longer peduncles and pedicels; triangular (vs. filiform-narrowly triangular) sepals; and stigmas that are larger and ± elongated club-shaped (vs. ± ellipsoid). The conservation status of P. piyae is provisionally assessed. In addition, molecular phylogenetic analyses using up to seven plastid DNA regions (matK, ndhF, rbcL and ycf1 exons; trnL intron; psbA-trnH and trnL-trnF intergenic spacers) and including, among others, five Phaeanthus accessions are carried out. Phaeanthus piyae is sister to a clade composed of the remaining accessions of Phaeanthus. Furthermore, southern Thailand also harbors a second species of Phaeanthus, which appears to be P. lucidus, a heterotypic synonym of P. splendens. Phaeanthus lucidus is herein reinstated; it differs from the sister species P. splendens by possessing a lower number of stamens and carpels per flower, as well as dissimilar placentation. A key to the two species of Phaeanthus in Thailand is given. Keyword: Miliuseae, molecular phylogeny, new species, Phaeanthus, resurrection, taxonomy, Thailand  
 Phaeanthus piyae Wiya, Aongyong & Chaowasku, sp. nov. Diagnosis: Phaeanthus piyae is morphologically most similar to P. intermedius. The new species differs by having longer peduncles and pedicels; triangular (vs. filiform-narrowly triangular) sepals; and stigmas that are larger and ± elongated club-shaped (vs. ± ellipsoid) (Table 1). Etymology: This species is named in honor of Dr. Piya Chalermglin, whose well-known book of Annonaceae in Thailand (Chalermglin, 2001) has greatly inspired the last author to chase his dream of becoming a systematic botanist. Distribution: Southern Thailand (Narathiwat Province). Habitat and phenology: Occurs in disturbed patches of evergreen forests among rubber and fruit tree plantations; at an elevation of 80–100 m. Flowering material collected in April–August, November; fruiting material collected in June, July, November. Vernacular name: Lueang-Piyarat (เหลืองปิยะรัตน์; Thai). Resurrection of Phaeanthus lucidus Oliv. Distribution: Southern Thailand (Narathiwat and Yala Provinces) and Peninsular Malaysia. Habitat and phenology: Occurs in disturbed patches of evergreen forests among rubber and fruit tree plantations; at an elevation of ca. 80 m. Flowering material collected in May, July, September; fruiting material collected in July, September. Vernacular name: Hua-Ling (หัวลิง; Thai). Chattida Wiya, Kithisak Aongyong, Anissara Damthongdee, Abdulromea Baka and Tanawat Chaowasku. 2021. The Genus Phaeanthus (Annonaceae, Miliuseae) in Thailand: P. piyae sp. nov. and Resurrection of P. lucidus, with Molecular Phylogenetic Analyses. Taiwania. 66(4); 509-516. DOI: 10.6165/tai.2021.66.509 สกุล | ||||||
| 8:14a | [Entomology • 2021] Microvelia pilosa • A New Species of Small Water Strider in the Genus Microvelia (Hemiptera: Heteroptera: Veliidae) from Aichi Prefecture, Honshu, Japan
Abstract A new species of small water strider (Hemiptera: Heteroptera: Veliidae), Microvelia pilosa sp. nov., is described from Aichi Prefecture, Honshu, Japan. It belongs to the subgenus Picaultia Distant, 1913 within the genus Microvelia Westwood, 1834, and is similar to Microvelia japonica Esaki and Miyamoto, 1955 and Microvelia douglasi douglasi Scott, 1874. The new species can be distinguished from these two taxa by its blackish-brown body, small punctures on the pronotum, and arcuate right paramere that is slender only in the distal part. Our molecular phylogenetic analysis using the mitochondrial COI gene revealed that M. pilosa sp. nov. is genetically separated from some of the other Japanese Microvelia and is most closely related to M. japonica. KEYWORDS: aquatic insects, MtDNA phylogeny, semiaquatic bugs, small water striders, taxonomy  Microvelia (Picaultia) pilosa Matsushima, Morii and Ohba, 2021  Ryosuke Matsushima, Takafumi Morii, Naoki Hiraishi and Shin-ya Ohba. 2021. A New Species of Small Water Strider in the Genus Microvelia (Hemiptera: Heteroptera: Veliidae) from Aichi Prefecture, Honshu, Japan. Zoological Science. 38(6); (2021). DOI: 10.2108/zs210035 新種のアメンボを長崎大学の研究グループが共同で発見 ～国内での新種カタビロアメンボの発見は、1964年以来、57年ぶり～ | ||||||
| 9:29a | [PaleoIchthyology • 2020] Mawsonia sp. • The First late Cretaceous Mawsoniid Coelacanth (Sarcopterygii: Actinistia) from North America: Evidence of A Lineage of Extinct ‘Living Fossils’
Abstract Today, the only living genus of coelacanth, Latimeria is represented by two species along the eastern coast of Africa and in Indonesia. This sarcopterygian fish is nicknamed a "living fossil", in particular because of its slow evolution. The large geographical distribution of Latimeria may be a reason for the great resilience to extinction of this lineage, but the lack of fossil records for this genus prevents us from testing this hypothesis. Here we describe isolated bones (right angular, incomplete basisphenoid, fragments of parasphenoid and pterygoid) found in the Cenomanian Woodbine Formation in northeast Texas that are referred to the mawsoniid coelacanth Mawsonia sp. In order to assess the impact of this discovery on the alleged characteristic of "living fossils" in general and of coelacanths in particular: 1) we compared the average time duration of genera of ray-finned fish and coelacanth in the fossil record; 2) we compared the biogeographic signal from Mawsonia with the signal from the rest of the vertebrate assemblage of the Woodbine formation; and 3) we compared these life traits with those of Latimeria. The stratigraphical range of Mawsonia is at least 50 million years. Since Mawsonia was a fresh, brackish water fish with probably a low ability to cross large sea barriers and because most of the continental components of the Woodbine Fm vertebrate assemblage exhibit Laurasian affinities, it is proposed that the Mawsonia’s occurrence in North America is more likely the result of a vicariant event linked to the break-up of Pangea rather than the result of a dispersal from Gondwana. The link between a wide geographic distribution and the resilience to extinction demonstrated here for Mawsonia is a clue that a similar situation existed for Latimeria, which allowed this genus to live for tens of millions of years. Systematic paleontology Actinistia Cope, 1871. Latimerioidei Schultze, 1993. Mawsoniidae Schultze, 1993. Genus Mawsonia Woodward in Mawson and Woodward, 1907 Mawsonia sp.
Lionel Cavin, Pablo Toriño, Nathan Van Vranken, Bradley Carter, Michael J. Polcyn, Dale Winkler. 2021. The First late Cretaceous Mawsoniid Coelacanth (Sarcopterygii: Actinistia) from North America: Evidence of A Lineage of Extinct ‘Living Fossils’ PLoS ONE. 16(11): e0259292. DOI: 10.1371/journal.pone.0259292  |
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