Unarmored and thin-walled dinoflagellates were collected from brackish and coastal waters of Korea from August 2019 to August 2021. A total of 10 species belonging to orders Sussiales and Gymnodiniales were isolated and established as clonal cultures. Of them, five species (Biecheleria brevisulcata, Lepidodinium chlorophorum, Karlodinium decipiens, Kirithra asteri, and Wangodinium sinense) are newly recorded in Korea and examined using a light microscope (LM) and a scanning electron microscope (SEM). Their molecular phylogeny was inferred from LSU rDNA sequences. Here, we present taxonomic information, morphological features, and molecular phylogenetic positions of these unrecorded dinoflagellate species.

Freshwater algae (green algae, blue-green algae and flagellated algae) were collected at 103 freshwater sites (including lakes, ponds, swamps, streams, and rivers) throughout South Korea March 2015-October 2016, and were identified using light microscopy. A total of 345 taxa in 2015 and 329 taxa in 2016 were identified and among them, 6 taxa in 2015 and 8 taxa in 2016 were new recorded species in Korea; The new recorded species were Characiopsis malleolus in Xanthophyceae, Phacus mammillatus in Euglenophyceae, Epipyxis utriculus and Lagynion ampullaceum in Chrysophyceae, Bicosoeca planctonica in Bicosoecophyceae and Salpingoeca frequentissima in Choanoflagellatea in 2015, and were Ankistrodesmus bernardii and Quadrigula korsikovii in Chlorophyceae, Didymocystis planctonica in Treubouxiophyceae, Spirulina nodosa, Raphidiopsis curvata and Geitlerinema claricentrosum in Cyanophyceae and Lagynion macrotrachelum in Chrysophyceae, Bicosoeca oculata in Bicosoecophyceae and Salpingeoca rosetta in Choanoflagellatea in 2016.

South Korean species of the bethylid wasps, genus Holepyris are reviewed. Ten species are recognized and eight of them are described as new to science: H. crinitus sp. nov., H. dimidium sp. nov., H. discedo sp. nov., H. mucro sp. nov., H. multo sp. nov., H. profundus sp. nov., H. secedo sp. nov., H. tantillus sp. nov.; Holepyris benten Terayama 2006 and H. susanowo Terayama 1999 are recorded for the first time from South Korea. Diagnostic characteristics and illustrations of each species are provided.

Twelve new species, Cryphia herczigi sp. nov., C. hohuana sp. nov., Odontestra lasxlogabe sp. nov., O. attila sp. nov., Xylena plumbeopaca sp. nov., Taivaleria rebrifasciata sp. nov., Hemiglaea radiata sp. nov., Nyctycia signa sp. nov., Fabiania pulla sp. nov., F. satellitia sp. nov., F. marki sp. nov., Asidemia albovitta sp. nov., and three new subspecies, Xestia fuscostigma csoevarii ssp. nov., Karana hoenei marcida ssp. nov. and genera, Taivaleria gen. nov. and Fabiania gen. nov., are established, and taxonomic notes for some little known noctuids are given. Illustrations of the male or the female genitalia for 45 species, and 34 images of adults are provided.