Two new freshwater species of Bacillaria (Bacillariophyta) from Dongting Lake, China

Phytotaxa ◽  
2021 ◽  
Vol 513 (3) ◽  
pp. 243-256
Author(s):  
JI-YAN LONG ◽  
DAVID M. WILLIAMS ◽  
BING LIU ◽  
YANG-YAN ZHOU
Keyword(s):  
New Species ◽  
Dongting Lake ◽  
Freshwater Species ◽  
Freshwater Habitat ◽  
Two New Species

Two new species in the genus Bacillaria, B. sinensis sp. nov. and B. dongtingensis sp. nov., are described from Dongting Lake, China. Both share the linear-lanceolate valve outline and the fault sites (i.e., branching and/or fusion of transapical ribs), the latter a character of the genus. Even though B. sinensis and B. dongtingensis are found at the same specific locality (sympatric), they differ by two characters: (1) the valves of B. sinensis have asymmetrical flanges on both sides of the raphe, while the raphe flange of B. dongtingensis is only on one side of the raphe; and (2) the valves of B. sinensis lack spines on the valve margins while B. dongtingensis has spines on both margins. Bacillaria sinensis and B. dongtingensis both possess two forms of fault sites on the same valves, i.e., they have both branching of transapical ribs and fusion of transapical ribs on the broader side of valve. This feature is not found in other species of Bacillaria, so it is unique. Bacillaria sinensis and B. dongtingensis are the first two species of Bacillaria reported from a typical and ‘normal’ freshwater habitat.

Francis Hamilton and the freshwater stingrays described in his Gangetic fishes (1822)

1998 ◽  
Vol 25 (2) ◽  
pp. 267-279 ◽  
Author(s):  
TYSON R. ROBERTS
Keyword(s):  
New Species ◽  
Direct Evidence ◽  
Freshwater Species ◽  
Museum Collections ◽  
Definite Evidence ◽  
Asiatic Society ◽  
Two New Species

Direct evidence bearing on identification of the two new species of Gangetic stingrays named Raia fluviatilis and R. sancur by Hamilton, 1822 comprises 1) the first written account by Hamilton (then Buchanan) of his encounters with Gangetic stingrays in 1807–1813, written at the time in manuscript, but not published until 1877; 2) Hamilton's accounts of Raia fluviatilis and Raia sancur published in 1822; 3) Hamilton drawing IV 7 in the archives of the Asiatic Society of Bengal (never published, original now lost); and 4) Hamilton drawing IV 65 in the same archives (published by Hora, 1929, original now lost; this drawing is not a copy or a version of drawing IV 7). The description of R. sancur clearly is based on a species of the genus Pastinachus. Drawing IV 7 presumably is the unfinished drawing of R. sancur mentioned by Hamilton, 1822, and is therefore also of a Pastinachus. Drawing IV 65, not mentioned by Hamilton, a complete drawing with dorsal and ventral views of a newborn male Pastinachus with an intact sting, is identified as based on Raia fluviatilis. Pending revision of the genus Pastinachus, the Gangetic species is tentatively identified as P. sephen (Forsskål, 1775). Identification of Raia fluviatilis with a large freshwater species of Gangetic Himantura advocated by Annandale, 1910; Chaudhuri, 1912; Compagno and Cook, 1996; and Zorzi, 1996 is based on unwarranted assumptions. There is no definite evidence that Hamilton ever saw a Gangetic Himantura. Himantura chaophraya Monkolprasit and Roberts, 1990 is the only available name applicable to huge large tropical Asian freshwater stingrays of the dasyatid genus Himantura. No specimens of Gangetic Himantura exist in present museum collections.

Two new species of Hyalella (Amphipoda, Dogielinotidae) from Brazil

Crustaceana ◽  
2013 ◽  
Vol 86 (7-8) ◽  
pp. 802-819 ◽  
Author(s):  
Alessandra A. P. Bueno ◽  
Paula B. Araujo ◽  
Giovanna M. Cardoso ◽  
Kelly M. Gomes ◽  
Georgina Bond-Buckup
Keyword(s):  
New Species ◽  
Rio Grande ◽  
Morphological Characters ◽  
The State ◽  
Freshwater Species ◽  
Rio Grande Do Sul ◽  
Hydrographic Basin ◽  
Two New Species ◽  
Polygonal Pattern ◽  
Cuticular Structures

Two new freshwater species of amphipods from Brazil are described here. Hyalella xakriaba n. sp. occurs in the hydrographic basin of the São Francisco River, in a biome characterized by a semiarid climate, in the state of Minas Gerais. This new species constitutes the northernmost record of the genus in Brazil. Hyalella kaingang n. sp. occurs in the hydrographic basin of the Mampituba River, located in Rio Grande do Sul, the southernmost state in Brazil. Currently 14 species of Hyalella are known in Brazil, cave species among them. Some morphological characters and their respective states are analyzed, and constitute an important new tool for species identifications. In particular, we describe the cuticular structures, defined as denticles, on the distal inner margin of the carpus of gnathopods 1 and 2. These structures may have a polygonal pattern or appear as comb scales, and may be arranged in one or more rows.

scholarly journals Two New Species of Parastenocaris (Copepoda, Harpacticoida) from a Hyporheic Zone and Overview of the Present Knowledge on Stygobiotic Copepoda in Vietnam

Diversity ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 534
Author(s):  
Ngoc-Son Tran ◽  
Mau Trinh-Dang ◽  
Anton Brancelj
Keyword(s):  
New Species ◽  
Hyporheic Zone ◽  
Small Rivers ◽  
Freshwater Species ◽  
Apical Seta ◽  
Central Vietnam ◽  
The Family ◽  
Two New Species ◽  
Freshwater Habitats ◽  
Caudal Rami

The number of freshwater species belonging to the genus Parastenocaris reported from ten countries of Southeast Asia is quite limited. Only two species have been reported so far from freshwater habitats there, compared to over 290 described species of the family Parastenocarididae worldwide. During the first study of the hyporheic zone of two small rivers in central Vietnam, two new species of the family Parastenocarididae were collected, Parastenocaris sontraensis sp. nov. and Parastencaris vugiaensis sp. nov. Both were collected from the gravel bar along the rivers (Suoi Da and Vu Gia river) using the Karaman–Chappuis method. Both the new species belong to the brevipes group of the genus Parastenocaris Kessler, 1913 sensu Lang (1948), and Reid (1995). Parastenocaris sontraensis sp. nov. is similar to P. hinumaensis Kikuchi, 1970 and Parastenocaris jane Karanovic, 2006 in the brevipes-group. Parastenocaris sontraensis sp. nov. differs from both Parastenocaris species by (i) Exp P3 with three segments in the male, (ii) caudal rami with seven setae, and (iii) caudal rami about 2.4 times as long as wide. Parastencaris vugiaensis sp. nov. can be distinguished from its congeners by the unique combination of the following characters: (i) the elliptical shape of caudal rami, (ii) apical seta (V) with bulbous base, and (iii) anal operculum extends beyond the end of anal somite. Until now, 14 stygobiotic species of Copepoda have been recorded in Vietnam (including two new species in this paper), which is relatively few compared with nearby Thailand with 25 species. Short comments on other stygobiotic Copepoda from Vietnam are added.

The genus Surinamysis (Mysida, Mysidae, Diamysini) from Amazonia and the coast of Brazil, with descriptions of two new species

Crustaceana ◽  
2017 ◽  
Vol 90 (3) ◽  
pp. 359-380 ◽  
Author(s):  
Karl J. Wittmann
Keyword(s):  
New Species ◽  
Calcium Carbonate ◽  
Freshwater Species ◽  
Old World ◽  
Brackish Waters ◽  
Rio Negro ◽  
Two New Species

The mysid Surinamysis rionegrensis sp. nov. is described from Rio Negro, a large freshwater tributary of the Amazon. A supplemented description is given for the freshwater species S. robertsonae Bamber & Henderson, 1990, and its known distribution within the Amazon system is amended. A further representative of this genus, S. aestuaria sp. nov., is described from brackish waters within the estuary system of Rio Quatipuru on the NE coast of Brazil. These three species share large statoliths mineralized with vaterite, a metastable polymorph of crystalline calcium carbonate. Among the three flagella of the male antennula, the median, ventral one is identified as an accessory flagellum, as opposed to the Old World genera Mesopodopsis and Limnomysis, where the inner flagellum or lobe is accessory. The distinctive characters of Surinamysis and its five species are presented. The diagnosis of this genus is modified and a key to its species is given.

A Synopsis of Dicliptera (Acanthaceae) in Brazil, with the Description of Two New Species

2020 ◽  
Vol 45 (2) ◽  
pp. 340-348
Author(s):  
James Lucas da Costa-Lima ◽  
Earl Celestino de Oliveira Chagas
Keyword(s):  
New Species ◽  
South America ◽  
The State ◽  
Northeastern Brazil ◽  
Mato Grosso ◽  
The North ◽  
New Synonyms ◽  
Two New Species ◽  
Mato Grosso Do Sul ◽  
A New Species

Abstract—A synopsis of Dicliptera (Acanthaceae) for Brazil is presented. Six species are recognized: Dicliptera ciliaris, D. sexangularis, and D. squarrosa, widely distributed in South America; D. purpurascens, which ranges from the North Region of Brazil (in the state of Acre) to eastern Bolivia; D. gracilirama, a new species from the Atlantic Forest of northeastern Brazil; and D. granchaquenha, a new species recorded in dry and semideciduous forests in Bolivia and western Brazil, in the state of Mato Grosso do Sul. Furthermore, we propose new synonyms and designate lectotypes for eleven names. An identification key to the six accepted Dicliptera species in Brazil is provided.

Two New Species of Aira (Poaceae) from the Iberian Peninsula and the Balearic Islands

2020 ◽  
Vol 45 (1) ◽  
pp. 75-84
Author(s):  
Llorenç Sáez ◽  
Javier López-Alvarado ◽  
Pere Fraga ◽  
Regina Berjano ◽  
M. Ángeles Ortiz ◽  
...  
Keyword(s):  
Risk Assessment ◽  
New Species ◽  
Iberian Peninsula ◽  
Diploid Species ◽  
Balearic Islands ◽  
Similar Species ◽  
Chromosome Counts ◽  
Two New Species

Abstract—Two new diploid species, Aira minoricensis and Aira hercynica, are described and illustrated, along with chromosome counts, risk assessment, distribution and habitat, phenology, and comparisons with morphologically similar species. A comparative table and a key for the species of Aira for the Iberian Peninsula and the Balearic Islands are provided to assist in the identification of these overlooked species, and their relationships to other taxa are discussed.

Palaeontology, taxonomic revision and variability of some species of the genus Gassendiceras Bert et al., 2006 (Ammonitina, Upper Barremian) from southeastern Franc

2013 ◽  
Vol 63 (3) ◽  
pp. 355-429 ◽  
Author(s):  
Didier Bert ◽  
Stéphane Bersac ◽  
Gérard Delanoy ◽  
Léon Canut
Keyword(s):  
New Species ◽  
Intraspecific Variability ◽  
Taxonomic Revision ◽  
Two New Species

Abstract Bed-by-bed sampling of twelve Barremian sections in southeastern France from pelagic basin (Vocontian Basin) to neritic platforms (Arc of Castellane, Arc of Nice and Provencal Domain) has enabled the collection of isochronous samples of the ammonite genus Gassendiceras. Three poorly known species of the Toxancyloceras vandenheckei Zone (Upper Barremian) are revised: G. alpinum, G. multicostatum and G. hoheneggeri; two new species are described (G. rebouleti nov. sp. and G. bosellii nov. sp.). The intraspecific variability of particular species was recognised. This variability is between slender peramorphic and robust paedomorphic extreme morphologies, with the presence of all intermediates.

New orchid species (Orchidaceae) in the flora of Laos

2019 ◽  
pp. 25-40
Author(s):  
L. V. Averyanov ◽  
Khang Sinh Nguyen ◽  
T. V. Maisak ◽  
Hiep Tien Nguyen ◽  
N. L. Orlov ◽  
...  
Keyword(s):  
New Species ◽  
Related Species ◽  
Field Studies ◽  
Regional Literature ◽  
Orchid Species ◽  
Two New Species

This paper continues the publication of new data obtained during field studies in remote and poorly studied regions of Laos in 2015–2018. It provides descriptions of two new species (Bulbophyllum brachyscapum Aver. and Sunipia saccata Aver.), emended descriptions of two previously published but insufficiently known species (Cleisostoma verrucosum Aver., Oberonia vesiculifera Aver.) and reports of eight species newly recorded in the flora of Laos (Biermannia calcarata Aver., Bulbophyllum farreri (W. W. Sm.) Seidenf., Didymoplexiella trichechus (J. J. Sm.) Garay, Eria eriopsidobulbon C. S. P. Parish et Rchb. fil., Habenaria ciliolaris Kraenzl., Liparis caudata Aver. et K. S. Nguyen, Odontochilus umbrosus (Aver.) Ormerod, and Porpax ustulata (C. S. P. Parish et Rchb. fil.) Rolfe). Appropriate citations of regional literature, colour illustrations, data on types and distribution, descriptions, etymology, as well as notes on taxonomy and related species are provided for the studied species.

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