A new arrowtooth eel of genus emMeadia/em (Synaphobranchidae: Ilyophinae) from Vietnam, South China Sea.

Meadia minor sp. nov., a scaless ilyophine eel, is described on the basis of 10 specimens collected from off Quy Nhon, central coast of Vietnam.

Deep into darkness: the first stygobitic species of freshwater shrimp of the genus Caridina (Crustacea: Decapoda: Atyidae) from Northern Vietnam.

The first stygobitic species of atyid freshwater shrimps from Vietnam is described from Cuc Phuong National Park, Northern Vietnam. Caridina thachlam sp. nov.

A new Rhopalomeris species (Diplopoda: Glomerida: Glomeridae), and notes on the phylogenetic relationships between glomeridans in Vietnam.

A new pill millipede, Rhopalomeris nagao sp. nov., is described from Vietnam.

V.S.Dang (Malvaceae, Helicteroideae), a new species from southern Vietnam.

V.S.Dang, from Ham Thuan Bac District, Binh Thuan Province, Vietnam is described and illustrated.

First record of the genus (Copepoda, Calanoida, Pseudocyclopidae) in Vietnam, with description of a new species from an anchialine cave in Tra Ban Island.

A new species, , was found in a brackish pool within an anchialine cave in Tra Ban Island in Bai Tu Long Bay, north Vietnam. The new species is clearly distinguished from all the six species currently known in the genus by the following unique characteristics: reduction of the septum between gonopores; narrow and pointed rostrum; basal segment of mandibular palp armed with three setae; maxillule without seta on the basal exite, and exopod with 11 setae; second and third endopodal segments of the maxilliped bearing three setae each; exopod of male right leg 5 2-segmented, with two strong and one vestigial spines on the outer margin of the distal segment; and last exopodal segment of female leg 5 bearing only one spine on the outer margin. We provide a description of the new species, along with detailed illustrations and scanning electron microscopy photographs.

Two new species of Hemiphyllodactylus (Squamata: Gekkonidae) from Hoa Binh Province, Vietnam.

We describe two new species of the genus Hemiphyllodactylus on the basis of a new collection of geckos from limestone karst forest of Hoa Binh Province, northwestern Vietnam. Hemiphyllodactylus bonkowskii sp. nov.

A new species of the assassin bug genus Rihirbus (Hemiptera: Heteroptera: Reduviidae) from Vietnam.

Rihirbus kronganaensis sp. nov. (Hemiptera: Heteroptera: Reduviidae: Harpactorinae) is described from central highlands of Vietnam.

Description of a new species, Actus hagiangensis (Mononchida, Mylonchulidae) from Ha Giang province, Vietnam.

Actus hagiangensis sp. nov. is described and illustrated from Vietnam.

, a new species of Gesneriaceae from Phu Quoc Island, South-western Vietnam.

A new species of Gesneriaceae, , is described and illustrated from Phu Quoc National Park, Kien Giang Province, South-western Vietnam. It is most similar to , and in having 3-verticillate petiolate leaves, morphologically similar calyx, corolla, stamens, pistil and fruit, but differs from all in the glandular-pubescent stems, petioles and leaf blades, 1(-2)-flowered cymes, longer corolla and fruit and longer and densely glandular-puberulent ovary. Data on distribution, ecology, phenology and provisional conservation assessment of the new species are given along with an illustration and a colour plate.

(Sect. Archecamellia - Theaceae), a new species from Vietnam.

A new species of Theaceae, N.S. Lý, V.

New records and an updated checklist of snakes from Son La Province, Vietnam.

Background: Son La Province is located in north-western Vietnam and the province contains a large area of 440,000 hectares of natural forest. A wide range of elevations and the complexity of landforms have given this province a great diversity of natural habitats and a high level of biodiversity potential. However, the snake fauna of Son La province is still poorly studied.

(Gesneriaceae), a new species from North Central Vietnam.

N.D. Do et al.

(Apocynaceae, Asclepiadoideae), a new species from Vietnam.

(Apocynaceae, Asclepiadoideae), a new species from Vietnam is described, illustrated and compared with the similar species Kerr. differs from by the morphology of the rachis of the inflorescence, the margins of the corolla lobes and the colour of the adaxial surface of the corolla.

Integrative taxonomy reveals three new taxa within the complex (Caudata, Salamandridae) from Vietnam.

The complex from northern Vietnam is reviewed based on morphological comparisons and analysis of the mitochondrial marker NADH dehydrogenase subunit 2 (ND2). Based on molecular divergences, which were revealed to be higher than in other congeners, in concert with morphological differences, two new species and one subspecies are described herein: differs from by 3.2 to 3.

The genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Northwest Vietnam, with description of a new species.

The genus Chalybion Dahlbom, 1843 from northwest Vietnam is studied. Six species of the genus are recorded for the area. Of these, C.

A new species of Megophrys (Amphibia: Anura: Megophryidae) from Vietnam.

A new species of Megophrys is described from Cao Bang Province, northeastern Vietnam based on morphological and molecular data. Morphologically, the new species is distinguishable from its congeners by a combination of the following characters: Size small (SVL 34.9-38.

Re-examination of the Chinese record of (Squamata, Natricidae), resulting in the first national record of and description of a new species.

The taxonomic status of the previous record of Stuart & Chuaynkern, 2007 from Guangdong and Guangxi, southern China, is revised based on the comparison of morphological and molecular data collected from the Chinese specimens and the holotype of from Thailand and Ziegler, Pham, Nguyen, Nguyen, Wang, Wang, Stuart & Le, 2019 from Vietnam. Results reveal that the population from Shiwandashan Nature Reserve in southern Guangxi, China belongs to , and represents the first national record for China; the populations from western Guangdong and southeastern Guangxi are described as a new species, We suggest that should be removed from the Chinese herpetofauna checklist. The new national record of and the description of the new species bring the total number of to 13 in China.

(Poaceae, Bambusoideae), a new species from Dakrong Nature Reserve, Vietnam.

is a new species of woody bamboo from Dakrong Nature Reserve, Quang Tri Province, central Vietnam. It is closely related to but differs by its pseudospikelets having terminal rachilla segments with ciliate margin and 6 bracts; culm sheath with the base of the outer margin having a slight projection below its point of attachment at the node, as well as sheath blades usually less than half as long as the culm sheath proper; and leaf blades pale-puberulent and sparsely pilosulous on the abaxial surface. The new species is described and illustrated here.

Three new fossil records of (Equisetaceae) from the Neogene of south-western China and northern Vietnam.

Three fossil species of (Equisetaceae) were reported from the Neogene of south-western China and northern Vietnam, based on well-preserved rhizomes with tubers. Equisetum cf. pratense Ehrhart from the middle Miocene of Zhenyuan County, Yunnan Province, China is characterised by a bunch of three ovate tubers with longitudinal ridges on the surface.

New records of megophryids (Amphibia: Anura: Megophryidae) from Son La Province, Vietnam.

Background: The family Megophryidae is one of the most poorly known groups of amphibians in Son La Province, Vietnam. In the herpetofaunal list of Vietnam in 2009 only two species of megophryids were recorded from this province and recent studies have documented five additional species of Megophryidae from Son La Province.

New Information: Based on recent field work in northern Vietnam, we report six new provincial records of the family Megophryidae from Son La Province, namely , , , , and .

Paranticoma lepta sp. n. and Elzalia bipectinella Hope amp; Aryuthaka, 2009 from water bodies of Vietnam.

Two nematode species found in water bodies of Vietnam are described and illustrated. Paranticoma lepta sp. n.

Sample checklist of Gastropoda and Bivalvia in Cham Islands, Vietnam.

Background: Cham Islands (Cu Lao Cham) is a group of 8 small islands in the Quang Nam province, Central Vietnam. There is only one study that mentioned the diversity of marine molluscs in this area. However, the data on species composition have not been digitised and not stored or shared for other purposes.

A new species of Limnonectes (Amphibia: Anura: Dicroglossidae) from Vietnam.

A new species of Limnonectes from central Vietnam is described based on morphological and molecular differences. Morphologically, the new species is distinguishable from its congeners on the basis of a combination of the following diagnostic characters: SVL 47.5-60.

Additions to knowledge of the paper wasp Polistes delhiensis Das and Gupta, 1989 (Hymenoptera: Vespidae: Polistinae) from Vietnam with description of the male and nest.

Notes on the paper wasp of the genus Polistes, Polistes delhiensis Das and Gupta, 1989 (Hymenoptera: Vespidae: Polistinae) from Vietnam are presented. The species has two color forms of the clypeus: brightly colored specimens were collected in the southern part of the range and darker colored specimens were collected in the northern part. Based on morphological and DNA data analysis, it is confirmed that both color forms belong to Polistes delhiensis.

Two new species of the genus Ishigakia (Hymenoptera: Ichneumonidae, Acaenitinae) from Vietnam based on morphological and molecular evidence.

The genus Ishigakia is reported from Vietnam for the first time, and two new species (I. babeensis sp. nov.