• Animal cells and systems
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• v.16 no.3
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• pp.245-253
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• 2012

A genuine interstitial cyclopoid species belonging to the genus Psammophilocyclops Fryer, 1956 is recorded from the filtration basin of a water treatment plant, South Korea. The genus Psammophilocyclops is very rarely found, and only three species have been recognized as yet: P. boccaroi Fryer, 1956 from Africa, P. trispinosus Shen et Tai, 1964 and P. bispinosus Shen et Tai, 1964 from China. The present new species differs from the congeneric species by the character combination of 11-segmented antennule in female, four-segmented maxilliped with 2,1,1,2 setation, the spine formula of 3,3,3,3, and setal arrangement of 3,3,5,3 on the distal endopodal segments of legs 1-4. Descriptio and taxonomic accounts of the new species are presented with a revised generic diagnosis and a key to the species hitherto known in the genus.

• Animal Systematics, Evolution and Diversity
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• v.37 no.3
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• pp.225-228
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• 2021

Eleven Gonioctena species have been recorded in the Korean Peninsula. Most species in the genus have very similar coloration and morphology. The male genitalia is generally used as the only reliable diagnostic character differentiating closely related species, but it is still difficult to identify females to species accurately. Here, we determined the COI barcodes of two Gonioctena species described from Korea and give morphological descriptions. The interspecific genetic divergence (Kimura 2-parameter) among the Gonioctena ranged from 0.073 to 0.138 and averaged 0.108. The pairwise genetic distance between the two Korean species(0.102) is similar to the average interspecific divergence. We predict that these analyses will help to resolve taxonomic issues and find cryptic species.

• Journal of Plant Biology
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• v.34 no.1
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• pp.59-66
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• 1991

The morphotaxonomic characters and life history of Symphyocladia latiuscula (Harvey) Yamada were investigated with field and laboratory culture materials. The species is well defined by a 5-15 cm hight, entirely corticated thallus and congenital fusion of 5-7 segments between main axis and laterals. Although all the reproductive structures are basically similar to those of other species of the genus, it is characteristic that the pinnulae are transformed into the flabellated tetrasporangial stichidia. Vegetative trichoblasts are known to be absent in the Pterosiphonieae, but their presence in S latiuscula does not accept its taxonomic position in that tribe. As a result, the occurrence of vegetative trichoblast is not useful for a taxonomic character to distinguish the tribes. The species shows a Polysiphonia-type life history involving a dimorphic alternation of gametophytes and sporophytes in culture and field. It grows below the middle intertidal zone in all the coasts of Korea throughout the year, although fertile plants are normally found during the summer months.months.

• Korean Journal of Plant Resources
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• v.33 no.2
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• pp.116-129
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• 2020

The genus Sedum comprises about 400 taxa with worldwide distribution, and about 20 taxa of the genus Phedimus distributed from Asia to Europe. According to some taxonomists, Phedimus and Sedum are two separate genera of the family Crassulaceae; however, in Korea Phedimus has been treated as a subgenus Aizoon within the genus Sedum. This ambiguous taxonomic treatment of the genus Phedimus needs further confirmation. In the study, we investigated morphological characteristics such as the whole plant height, leaf morphology, and seed coat features of these two genera. We believe that these characters are very important to distinguish Phedimus and Sedum. The result indicated that the seed surface pattern was the most useful diagnostic character. The Sedum had a hexagonal pattern with a single nipple protrusion, whereas the Phedimus had a rectangular pattern with papilla on both ends. The results of this study strongly support the separation of Phedimus from Sedum and thus Phedimus need to be treated as an independent genus.

• Korean Journal of Plant Taxonomy
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• v.35 no.1
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• pp.25-46
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• 2005

External morphology focusing on the flower structure of Korean Platanthera was examined. The genus Tulotis was included to the genus Plathanthera as previously suggested by many workers, because the diagnostic character to distinguish the two genera was not distinct enough. It is revealed that the taxon previously recognized as P. metabifolia was the misidentification of P. chlorantha and P. neglecta should be treated as a distinct species from P. mandarinorum. In result, Korean Platanthera were rearranged into 8 species; P. chlorantha, P. mandarinorum, P. neglecta, P. hologlottis, P. japonica, P. ophrydioides, P. ussuriensis, and P. fuscescens. A key to the species of Korean Plathanthera and taxonomic discussion of each species were provided.

• Korean Journal of Ichthyology
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• v.34 no.3
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• pp.153-159
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• 2022

The olfactory organ of a Korean endemic species, Pseudobagrus koreanus, was investigated to describe its morphology and histology and analyze correlation between habitat environment and its ecological habits and characters, using a stereo microscope, a light microscope, and a scanning electron microscope. Its external morphology showed tubular anterior nostril at the tip of the snout and slit posterior nostril at the base of the nasal barbel. The olfactory chamber showed the rosette structure consisting of numerous lamellae radial and parallel to the medium raphe. The olfactory lamella has the sensory epithelium with olfactory receptor nuerons, supporting cells, basal cells, lymphatic cells, plasma cells and the non-sensory epithelium with stratified epithelial cells, mucous cells, lymphatic cells. In particular, 1) 41~43 (n=20) lamellae, 2) lymphatic cells and plasma cells, 3) mucous cells including neutral polysaccharid may be olfactory characteristics relevant to a stagnant or a standing habitat environment, nocturnal habit dependent on olfaction, and taxonomic characters compared at least to other catfish species.

• Korean Journal of Plant Taxonomy
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• v.41 no.4
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• pp.345-352
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• 2011

The morphological characters of Scrophularia kakudensis Franch. and its relatives were examined. The major features of S. kakudensis were determined to resolve the taxonomic confusion with the closely related taxa of S. kakudensis var. microphylla, S. pilosa and S. cephalantha. S. kakudensis is characterized by its flowering in Jul. to Sep., the node numbers on a stem, the size of the leaves, the development of inflorescences and the presence of glandular trichomes on its stems and leaves. S. cephalantha is distinct from S. kakudensis by the earlier flowering season, fewer node numbers on a stem, and fewer numbers of flowers on shorter rachis. Smaller sizes of S. kakudensis var. microphylla, considered to be a problematic character previously, are stable and distinctive from other taxa in the natural habitats of the multiple populations investigated in the study. Therefore, the taxon should remain as a variety of S. kakudensis. An examination of the diagnostic characteristics of S. pilosa, such as its inflorescence type and the presence of a stem with pubescence, does not provide sufficient distinction from S. kakudensis. A type specimen and habitat survey also support the merging of the two taxa. S. pilosa should be treated as a synonym of S. kakudensis, because it is considered to be a misidentification of S. kakudensis.

• Korean Journal of Plant Resources
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• v.20 no.2
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• pp.193-200
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• 2007

Pollen grains of seven taxa on the family Pyrolaceae, known to be distributed in Korea (Pyrola dahurica(Andreses) Kom., P. incarnata (DC.) Fisch. ex Kom., P. japonica Klenze ex Alefeld, P. minor L., P. renifolia Max., Orthilia secunda (L.) House, Chimaphila japonica Miq.), were examined by the light and the scanning electron microscope in order to evaluate their taxonomic significances. The pollen units of genus Pyrola, Orthilia, Chimaphila were tetrad, monad, polyad respectively. This characteristics was good character for delimiting the genus, and Orthilia secunda (L.) House was more proper scientific name than Pyrola secunda L. based upon this character. Pollen size, tricolporate length, surface sculpturing pattern were different slightly among the treated taxa, and surface sculpturing patterns of Pyrola dahurica, P. incarnate, P. renifolia, Chimaphiza japonica were different from previous reports. Evolutionary trends of pollen grains in Pyrolaceae were inferred from the pollen units and aperture shapes.

• The Korean Journal of Zoology
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• v.31 no.1
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• pp.56-61
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• 1988

The taxonomic status of Moroco Jagowskii and M oxycephalus a pair of sibling species inhabiting in Korean fresh waters, has been unclear up to date. Recently a sympatric area of these species was found (Kang, 1987). The purpose of this study was to clarify their specific status by analysing specimens collected from the sympatric area of these species. Isozyme analysis and morphometric comparison were performed. Among 26 loci screened 6 loci (Aco, Est-2, E-X, Gk-3, Ipo, Me) showed fixed allelic difference between them and these loci could be used as genetic markers to distinguish them. Isozyme analysis indicates that no hybridization occurs and therefore it is assumed that isolating mechanism is completed and they are distinct species. The mean number of scales above lateral line (SAL) of M Jagowskii and M oxycephalus at sympatric area was 24.93 $\pm$1.95 and 17.33$\pm$0.72 respectively, and it seems as the result of character displacement. A finer microhabitat segregation between them is noticed. M oxycephalus is found along the effluent streams whereas M lagowskii is distributed mostly in the main stream at sympatric area.

• Animal Systematics, Evolution and Diversity
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• v.19 no.1
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• pp.139-147
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• 2003

Burckhardt (1987) combined Aphalaridae and Spondyliaspididae into the Psyllidae, as there were no character sets which had clearly defined these three families. During the analysis on the character evolution of the psyllids from the world including Australia, there were a few different results for the taxonomy of the Spondyliaspidinae. 52 species and 28 genera in the Australian native psyllids were dissected to examine the taxonomic position of the subfamily Spondyliaspidinae. All of the dissected psyllids in the subfamily Spondyliaspidinae had one follicle in the male testes, but the subfamilies of the Psyllidae except Spondyliaspidinae were having two or more follicles. By the characteristics with living on the Eucalyptus host plants recently evolved, having just one follicle which clearly defined it from other families and experienced an explosive specific diversification in the Gondwana region, it is reasonable to separate the subfamily Spondyliaspidinae from the family Psyllidae with two or more follicles.