About 114 "species" of Macrothrichidae, Eurycercidae, and Chydoridae (Cladocera, Anomopoda), belonging to 39 genera, have been reported from China, with 14 species in 6 genera in Macrothrichidae, 2 species in one genus in Eurycercidae, and 98 species in 31 genera in Chydoridae. In total, 203 species in 62 genera, 13 families and 4 orders have so far been reported from the country. Of these, 187 are tentatively considered as valid, while 16 are incertae sedis. In reality, many records hide taxonomic problems that remain to be settled. Up to 10 percent of this fauna might be endemic at the species level, but we expect this number to increase pending new, comprehensive studies. No endemic genera fall to be recorded. Most of the several hundreds of taxonomic or biogeeographic papers from which this information was extracted suffer from poor or outdated taxonomy, such that up to half of all species are up for re-evaluation. Detailed morphological examination, but also provoked male production, especially in chydorids, are ways to improve identifications and should be stimulated. On the other hand, the inventory is certainly still incomplete with several tropical-subtropical taxa still to be expected in China. The extreme south and islands are among promising sites that remain to be explored, as well as extreme habitats all over the country. Molecular studies in China started around the beginning or the present decade, and should be multiplied.
Approximately 199 cladoceran species, 5 marine and 194 freshwater and continental saltwater species, live in China. Of these, 89 species are discussed in this paper. They belong to the 4 cladoceran orders, 10 families and 23 genera. There are 2 species in Leptodoridae; 6 species in 4 genera and 3 families in order Onychopoda; 18 species in 7 genera and 2 families in order Ctenopoda; and 63 species in 11 genera and 4 families in non-Radopoda Anomopoda. Five species might be endemic of China and three of Asia. Many records are suspect at the species level, and numerous taxonomic problems remain to be settled.
Polyphasic taxonomic studies have been largely conducted at genus/species levels in cyanobacteria, leading to the description of numerous cyanobacterial genera and species. The present study describes a new cyanobacterial species Stigonema dinghuense, sp. nov. Song et Li based on the combination of morphological, genetic, and ecological evidences. This new species was collected from a wet rocky wall in Dinghu Mountain, Guangdong Province, China. Stigonema dinghuense was morphologically similar to Stigonema mamillosum, the type species of the genus, however, Stigonema dinghuense grew on the rocky wall in subtropical region and the type species Stigonema mamillosum inhabited in subfrigid and frigid zones, reflecting a relatively large difference in ecology. 16S rRNA sequences based phylogeny revealed that all the Stigonema species/strains reported so far, including S. dinghuense, grouped into a monophyletic cluster. Phylogenetic analyses based on 16S rRNA, nifH and rbcLX gene sequences yielded the congruent support for the monophyly of heterocytous cyanobacteria. The true branching cyanobacteria (formerly Stigonematales) were separated into four major groups, three of which intermixed with Scytonemataceae.Key words: Cyanobacteria, Morphology, Phylogeny, Taxonomy, Stigonematales, Nostocales
IntroductionThe taxonomic system of cyanobacteria has been continuously revised over the past decades due to the development of modern and integrated approaches (Hoffmann et al.
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