Two New Lacconectus Species from Vietnam (Coleoptera; Dytiscidae)

Two new species of Lacconectus Motschulsky are described from Vietnam, Lacconectus valeriae sp. n. and L. baolocensis sp. n., and a key is given for the species described from and occurring in that country. Together with the two new species, seven species are now known from Vietnam, and the number of Lacconectus species rises to 60.     

The species composition of rotifers in the water reservoirs of Central Vietnam

The rotifer fauna has been studied in four water reservoirs in the Khanh Hoa Province, Central Vietnam. A total of 65 species and subspecies and 22 genera representing 15 families have been found; 25 species and subspecies are identified as new to Vietnam. Morphometric characteristics are given for Filinia camascela Myers, Brachionus donneri Brehm, and B. dichotomus reductus Koste et Shiel. The rotifer fauna of Central Vietnam and those of other countries of Southeast Asia are compared. Some of the tropical and subtropical species recorded have been repeatedly reported from Russia.     

A New Species of the Genus Colilodion Besuchet (Coleoptera: Staphylinidae: Pselaphinae) from Vietnam

A new pselaphine species, Colilodion thienmu n. sp., is described from Mt. Bach Ma in Central Vietnam. SEM photographs of this species are provided and morphological notes are given in this study.     

931. RHODODENDRON SUOILENHENSE

A new species of Rhododendron, R. suoilenhense D.F. Chamberlain, Nguyen Thi Thanh Huong & Rushforth, is described from northern Vietnam and illustrated. Its discovery and distribution are noted. Suggestions for its cultivation are given.     

Alpinia newmanii sp. nov. (Zingiberaceae) from central Vietnam

Alpinia newmanii, a new species from central Vietnam, is described and illustrated. A morphological comparison with the most closely related species and a key to the species of Alpinia subsection Catimbium in Vietnam are provided.     

Scorpions from the Island of Côn Son (Poulo Condore), Vietnam and description of a new species of Chaerilus Simon, 1877 (Scorpiones, Chaerilidae)

The scorpion fauna of the Island of Côn Son (Poulo Condore), Vietnam is briefly discussed and a new species, Chaerilus phami sp. n. is described. The new species is morphologically distinct from all the other species of Chaerilus described from the mainland in Vietnam.     

The Genus Rhyacophila Pictet (Trichoptera: Rhyacophilidae) in Vietnam

Currently, 20 species of the genus Rhyacophila are known from Vietnam. Of these, 17 species are distributed among eight species groups, with three species unassigned. Examination of material collected by personnel of the Royal Ontario Museum in Toronto, Canada has revealed six new species and five new records of Rhyacophila from Vietnam, distributed among six species groups, four of which are new to Vietnam. Newly described species include: Rhyacophila smithi, Rh. curriei, Rh. laocai, Rh. meyi, Rh. olahi, and Rh. fernandi. Rhyacophila bidens Kimmins, Rh. inaequalis Denning and Schmid, Rh. lhabu Schmid, Rh. malayana Banks, and Rh. rhombica Martynov are recorded from Vietnam for the first time. The females of four species, Rh. bidens, Rh. immaculata Mey, Rh. malayana Banks, and Rh. tamdaona Oláh, are described for the first time. All 31 species of Rhyacophila now known from Vietnam are included in this work, organized by branch and species group.     

Aspidistra obtusata sp. nov. (Asparagaceae) from Vietnam

Aspidistra obtusata is described and illustrated as a new species from southern Vietnam. The new species resembles A. truongii, but differs in smaller diameter of perigone (12.6–14.9 mm vs 25–35 mm), shape of tepals (elliptic, obtuse vs triangular‐ovate) and pistil (widely obconic vs mushroom‐shaped). A molecular characterization of the new species (based on data of plastid psbA‐trnH and nuclear 5S‐NTS regions) is also given, and compared with the most similar congeners.     

Occurrence of velvet-fishes of the genus <Emphasis Type="Italic">Cocotropus</Emphasis> (Teleostei: Scorpaeniformes: Aploactinidae) in Vietnam waters with descriptions of two new species

For the first time, the genus Cocotropus is recorded from the South China Sea and in the Vietnam fauna. Two new species are described—C. astakhovi and C. eksae spp. n. They are compared in detail with 14 previously known species of this genus. The fauna of velvet-fishes of Vietnam is revised. Previously noted for Vietnam Paraploactis sp. is attributed to C. astakhovi.     

Miliusa cambodgensis sp. nov. (Annonaceae) from Cambodia and M. astiana,M. ninhbinhensis spp. nov. from Vietnam

The genus Miliusa in Cambodia and Vietnam is reviewed. Cambodia and Vietnam each harbors six species of Miliusa, including three which are described as new to science: one from Cambodia (Miliusa cambodgensis sp. nov.), the other two from Vietnam (M. astiana and M. ninhbinhensis spp. nov.). In addition, a complete nomenclature and relevant information about the Miliusa species previously known from Cambodia and Vietnam are provided, including keys to the Cambodian and Vietnamese species, the designation of a lectotype for M. baillonii and the synonymization of M. balansae var. elongatoides, M. chunii and M. sinensis with M. balansae.     

The Protohermes fruhstorferi species group (Megaloptera: Corydalidae: Corydalinae), with description of a new species from Vietnam

A new species group, the Protohermes fruhstorferi group of the dobsonfly genus Protohermes, is recognised. Three species belonging to the new species group are described and illustrated, including one new species from northern Vietnam.     

Molecular assessment of Ulva (Ulvales,Chlorophyta) diversity in Vietnam including the new species U. vietnamensis

Species diversity of Ulva in Vietnam was investigated using three commonly used genetic markers, the nuclear encoded rDNA ITS region and the plastid encoded rbcL and tufA genes. Single locus species delimitation methods, complemented with morphological and ecological information resulted in the delimitation of 19 species. This diversity is largely incongruent with the traditional understanding of Ulva diversity in Vietnam. Only four species identified in this study, U. lactuca, U. reticulata, U. spinulosa, and U. flexuosa, have been previously reported, and seven species, U. ohnoi, U. tepida, U. chaugulii, U. kraftiorum, U. meridionalis, U. limnetica, and U. aragoënsis, are recorded for the first time from Vietnam. Seven genetic clusters could not be associated with species names with certainty. A new species, U. vietnamensis, is described from marine to brackish coastal areas from southern Vietnam based on its morphological and molecular distinctiveness from the currently known Ulva species. A comparison with recent molecular-based studies of Ulva diversity showed that species composition in Vietnam is similar to that of adjacent countries, including Japan, China, as well as Australia. Our study emphasizes the importance of molecular data in the assessment of Ulva diversity, and indicates that a lot of diversity may still remain to be discovered, especially in tropical regions.     

New liverwort records for Vietnam

A short collecting expedition to Vietnam in 2016 yielded 700 specimens of 170 liverwort species of which 79 were new to the flora of Vietnam, including 43 species new to Indochina. Many of the newly recorded species have meta-Himalayan distributions (that predicts occurrence of these taxa in the areas of north-west Vietnam situated in the south-easternmost spurs of the Himalaya). Some species were recorded based on the study of living material, permitting the examination of oil body characteristics for Riccardia and Calypogeia. The known taxonomic liverwort diversity of Vietnam is currently 379 taxa, estimated to represent ca 80% of the actual taxonomic diversity in the country.     

New species of Peliosanthes,Rohdea and Tupistra (Asparagaceae) from Laos and Vietnam

We describe and illustrate four new species, Peliosanthes choriandra, P. tatianae and Tupistra orlovii from central to northern Laos, and Rohdea filosa from northern Vietnam. These are all very local in distribution and endemic to the respective countries. We also report new localities and their ecological conditions for five other species of Peliosanthes (P. argenteostriata, P. hirsuta, P. irinae, P. micrantha and P. nivea) recently described from Laos and/or Vietnam. Furthermore, Peliosanthes nivea is recorded as new to the flora of Laos.     

New species of Ophiopogon,Peliosanthes and Tupistra (Asparagaceae s.l.) in the flora of Vietnam

Five new species named Peliosanthes aperta, P. elegans, P. kenhillii, Tupistra densiflora and T. patula are described and illustrated. These species are very local in distribution and endemic to northern or southern Vietnam. Two other species, Ophiopogon ogisui and Peliosanthes griffithii, are recorded as new to the flora of Vietnam. A key to the species of Tupistra occurring in Indochina and its neighboring regions is also provided.