Pan Yu

Shanghai Normal University | SHNU · College of Life Sciences

A novel monoraphid diatom species, Cocconeis crisscrossis You, Yu, Kociolek & Wang, sp. nov. is examined and described from the Qingyi River and Maolan Nature Reserve of southern China. The morphological description is based on light microscopy and scanning electron microscopy observations and the new species is compared with similar taxa in this g...

In our recent investigations of diatom diversity, we studied three species, namely, Skeletonema costatum, Skeletonema subsalsum, and Skeletonema potamos. Although they have been found frequently in Changjiang (Yangtze) River Basin, their morphological and molecular identification is difficult in taxonomy. Therefore, to integrate morphological and m...

Based on a combination of morphology and molecular data of ribosomal DNA genes, a new diatom genus Lineaperpetua gen. nov. Yu, You, Kociolek & Wang is described. The features that help define Lineaperpetua at the level of genus include: a tangentially undulated valve face; continuous cribra areolae on the valve interior consisting of pores arranged...

An interesting group of cymbelloid diatoms was collected from lakes in Yunnan Province, China, and observations on their valve morphology made using light and scanning electron microscopy. These cymbelloid species all have apical pore fields, slit-like areolae, and areolar occlusions, and they all lack of stigmata. In this paper we propose the new...

Skeletonema potamos is a freshwater diatom that has been widely distributed in North America, Europe, and Australia since the 1980s. However, there have been few previous reports of S. potamos in China. Only recently has S. potamos been frequently found in our extensive ecological surveys in China, and it has sometimes even been the dominant specie...

We describe Frustulia hengduanensis sp. nov., a new species of Frustulia from the Hengduan Mountains in China, based on morphological examinations using light and scanning electron microscopy. Frustulia hengduanensis is characterized by elliptico-lanceolate to rhomboid valves with slightly undulate margins, narrowly rounded and moderately protracte...

A new freshwater diatom species, Achnanthidium kangdingnese Yu, You & Wang, sp. nov. from Sichuan Province, China, is described. The morphology of this species was analyzed with scanning electron microscopy (SEM) and light microscopy (LM). A. kangdingnese belongs to the A. initium -like subgroup, which has external distal raphe ends curved in oppos...

Diatoms play an important role in aquatic ecosystem, and it is widely used in water quality monitoring because of its widely distribution, short reproductive cycle and sensitivity to environmental changes. In order to establish the diatom index suitable for the ecological evaluation of water in China, the community structure and environmental chara...

We describe two new Achnanthidium species, A. anhuense sp. nov. and A. qingxiense sp. nov. , from Qingxi River, Anhui Province, China, based on light and scanning electron microscopy. Both species belong to the “ A. pyrenaicum complex” of the Achnanthidium genus, based on their possession of transapically-elongated areolae and deflected external di...

In this study, three new species of the genus Gomphonema from freshwater lakes of the lower reaches of Yangtze River, China. They include G. qii sp. nov. from Yangcheng Lake, G. poyangense sp. nov. from Poyang Lake, and G. longganense sp. nov. from Longgan Lake, and all of these new species were collected on stone. We detailed morphological feature...

Periphytic diatoms play important functional roles in aquatic ecosystems. Their community compositions are widely used in water quality monitoring due to their wide distribution, short reproductive cycles, and sensitivity to environmental changes. In this study, 116 samples of periphytic diatom samples were collected from lakes in the lower reaches...

Melosira is one of the most common diatom genera found in freshwater ecosystems. There are many freshwater species of Melosira, of which M. varians is the most common. In our investigation of periphytic diatoms in the Jinsha River, China, a new species, M. capsularum sp. nov, was characterized in combined morphological and molecular approaches. M....

Three new species of Hannaea Patrick from the Hengduan Mountains in China are formally described herein, based on light and scanning electron microscope observations. Hannaea yalaensis sp. nov. has three continuous inflations along the ventral margin, resulting in an undulate outline compared to the outline of the most commonly reported Hannaea spe...

Four new monoraphid diatoms are examined and described from a high-altitude (> 3000 m) region of western Sichuan, China. The descriptions are based on light and scanning electron microscopy observations, and the four new species are compared with similar taxa worldwide. Achnanthidium sichuanense sp. nov. has small, lanceolate-elliptical valves, wit...

In this study, a new Gomphonema species from Qingyi River, Anhui Province, China, was identified and named Gom-phonema qingyiensis sp. nov. We detailed its morphology using light microscopy (LM) and scanning electron microscopy (SEM). The LM and SEM photographs illustrate the size ranges and particular ultrastructure of the new species. The valves...

Light (LM) and scanning electron microscopy (SEM) observations were used to describe two new species of the freshwater monoraphid genus Crenotia Wojtal. Both species, Crenotia distincta, sp. nov. and Crenotia oblonga, sp. nov. have a unique stria structure, bi-to multiseriate terminating near the axial area. Internally, these terminal areolae have...

We describe a new species of diatom, Psammodictyon taihuensis sp. nov., collected from the Taihu Basin, Jiangsu Province, China. There are several features of this diatom that suggest it should be included in the genus Psammodictyon, notably the possession of panduriform valves characterized by a longitudinal fold near the apical axis, coarsely are...

Five new species are described in this study: Achnanthidium jiuzhaienis sp. nov., Achnanthidium epilithica sp. nov., Achnan-thidium limosua sp. nov., Achnanthidium subtilissimum sp. nov., and Kolbesia sichuanenis sp. nov. Classification was based on light microscopy (LM) and scanning electron microscopy (SEM). A. jiuzhaienis sp. nov. belongs to the...

Mugecuo Scenic Area is located in the northern Hengduan Mountains between the Sichuan Basin and the Qinghai-Tibet Plateau and has a subtropical humid monsoon climate. The area is at an altitude of 2600–3800 m above sea level (asl), with water originating mostly from melting mountain snow. In the region, a total of 20 Eunotia species have been ident...

we present light and scanning electron microscopic observations on the valve ultrastructure of 4 species of the genus Ger-mainiella from the Maolan Nature Reserve from guizhou Province, China. This is the first report of the genus from China. The new species differ in the shape and size of the valves, but they all have the large conopeum covering t...

A new freshwater species, Achnanthidium longissimum sp. nov., is described from Jiuzhai Valley, Sichuan Province (Southwest China), based on light and scanning electron microscopy. This species belongs to the 'Achnanthidium pyrenaicum complex', based on having transpically elongated areolae and deflected distal raphe fissures. Achnanthidium longiss...

Abstract: We describe three new Achnanthidium species, A. lacustre sp. nov., A. sublanceolatum sp. nov., and A. taipingensis sp. nov., from Taiping Lake, Anhui Province (China) based on light and scanning electron mi- croscopy. A. lacustre sp. nov. belongs to the “A. minutissimum complex” of the genus, based on it having straight external distal ra...

A new species of Tabularia, Tabularia sinensis, is described from the inland Poyang Lake (Jiangxi Province), the largest lake in China. The description is based on light and scanning electron microscope observations of valve and girdle elements. Given the diversity of forms in the genus, the relationships and status of the genus was investigated in...

Benthic diatoms are an indispensable link of the water ecological system in terms of energy flow and material cycling, and they directly or indirectly reflect the status of the water environment. We sampled benthic diatoms and environmental factors from April to May of 2013 from 53 sites along the Ying River to study their application in local wate...

Nupela major sp. nov., a new species of the diatom genus Nupela, is described from Maolan Nature Reserve, Guizhou Province, China. Observations were made using light and scanning electron microscopy documenting the size, shape and ultrastructure of the new species. Valves of the monoraphid frustules are elliptical-lanceolate with more or less cunea...

A new species, Simonsenia maolaniana sp. nov., is reported from a typical karst landform, Maolan Nature Reserve, Guizhou Province, China. The valves are lanceolate (larger frustules) to elliptical-lanceolate (smaller frustules), widest in the centre of the valve, and narrowly rostrate, not protracted at the ends. The more lanceolate valve outline,...