Description of Two species of the Genus Agauopsis (Acari: Halacaridae) from Korea

Two marine halacarid species of the genus Agauopsis Viets, 1927 (Acari: Halacaridae) are newly reported from Korea, which are supposed to be new to science tentatively. Agauopsis sp. 1 belongs to microrhyncha-group in having one ventral and three ventromedial spines on tibia of leg 1, of which two ventromedial ones are adjacent to each other. Agauopsis sp. 1 is most similar to A. miliaris Bartsch, 2005 in sharing the same chaetotaxy of legs and positions of the second and fourth dorsal setae, however, the former differs from the latter by the number of perigenital setae in female, with 4 pairs in Agauopsis sp. 1 versus 3 pairs in A. miliaris. Agauopsis sp. 2, belonging to the ornata-group by the conspicuous garland-like arrangement of porose polygons on anterior epimeral plate, resembles the congeneric species with one thick pectinate seta on tibia of leg 2, A. pseudoornata Bartsch, 1985, A. calidictyota Bartsch, 2007, A. zanzibari Chatterjee, Pesic, Chan & De Troch, 2009. However, Agauopsis sp. 2 is distinguished from the three species above by bearing six setae of telofemur of leg 2 (against five setae in them). We present description of both species herein, and conduct systematic accounts on them with providing character comparison tables, detailed illustrations and photomicrographs under a differential interference contrast microscope. A key to the four species of the genus Agauopsis recorded from Korea is also p three ventromedial spines on tibia of leg 1, of which two ventromedial ones are adjacent to each other. Agauopsis sp. 1 is most similar to A. miliaris Bartsch, 2005 in sharing the same chaetotaxy of legs and positions of the second and fourth dorsal setae, however, the former differs from the latter by the number of perigenital setae in female, with 4 pairs in Agauopsis sp. 1 versus 3 pairs in A. miliaris. Agauopsis sp. 2, belonging to the ornata-group by the conspicuous garland-like arrangement of porose polygons on anterior epimeral plate, resembles the congeneric species with one thick pectinate seta on tibia of leg 2, A. pseudoornata Bartsch, 1985, A. calidictyota Bartsch, 2007, A. zanzibari Chatterjee, Pesic, Chan & De Troch, 2009. However, Agauopsis sp. 2 is distinguished from the three species above by bearing six setae of telofemur of leg 2 (against five setae in them). We present description of both species herein, and conduct systematic accounts on them with providing character comparison tables, detailed illustrations and photomicrographs under a differential interference contrast microscope. A key to the four species of the genus Agauopsis recorded from Korea is also p2

Scaptognathus magnus (Acari: Halacaridae), a New Record from Korea

An arenicolous halacarid, Scaptognathus magnus Abé is first recorded from Korea, which was collected from littoral coarse sandy bottom around Simnibawi Rock off Gangreung in the east coast of South Korea. The remarkable characteristics of this species are large body with idiosoma more than 470 μm long, nearly trapezoidal anterior dorsal plate, and a unique chaetotaxy of bipectinate setae 5-3-3-3 on tibiae I-IV. The characteristics of Korean specimens coincide well with the original description from Hokkaido, Japan, except for the number of parambulacral setae on tarsus III and the weak median claws. Detailed illustrations and scanning electron microscope photographs based on Korean specimens are provided.22Nkc

Description of Two species of the Genus Agauopsis (Acari: Halacaridae) from Korea

Two marine halacarid species of the genus Agauopsis Viets, 1927 (Acari: Halacaridae) are newly reported from Korea, which are supposed to be new to science tentatively. Agauopsis sp. 1 belongs to microrhyncha-group in having one ventral and three ventromedial spines on tibia of leg 1, of which two ventromedial ones are adjacent to each other. Agauopsis sp. 1 is most similar to A. miliaris Bartsch, 2005 in sharing the same chaetotaxy of legs and positions of the second and fourth dorsal setae, however, the former differs from the latter by the number of perigenital setae in female, with 4 pairs in Agauopsis sp. 1 versus 3 pairs in A. miliaris. Agauopsis sp. 2, belonging to the ornata-group by the conspicuous garland-like arrangement of porose polygons on anterior epimeral plate, resembles the congeneric species with one thick pectinate seta on tibia of leg 2, A. pseudoornata Bartsch, 1985, A. calidictyota Bartsch, 2007, A. zanzibari Chatterjee, Pesic, Chan & De Troch, 2009. However, Agauopsis sp. 2 is distinguished from the three species above by bearing six setae of telofemur of leg 2 (against five setae in them). We present description of both species herein, and conduct systematic accounts on them with providing character comparison tables, detailed illustrations and photomicrographs under a differential interference contrast microscope. A key to the four species of the genus Agauopsis recorded from Korea is also p three ventromedial spines on tibia of leg 1, of which two ventromedial ones are adjacent to each other. Agauopsis sp. 1 is most similar to A. miliaris Bartsch, 2005 in sharing the same chaetotaxy of legs and positions of the second and fourth dorsal setae, however, the former differs from the latter by the number of perigenital setae in female, with 4 pairs in Agauopsis sp. 1 versus 3 pairs in A. miliaris. Agauopsis sp. 2, belonging to the ornata-group by the conspicuous garland-like arrangement of porose polygons on anterior epimeral plate, resembles the congeneric species with one thick pectinate seta on tibia of leg 2, A. pseudoornata Bartsch, 1985, A. calidictyota Bartsch, 2007, A. zanzibari Chatterjee, Pesic, Chan & De Troch, 2009. However, Agauopsis sp. 2 is distinguished from the three species above by bearing six setae of telofemur of leg 2 (against five setae in them). We present description of both species herein, and conduct systematic accounts on them with providing character comparison tables, detailed illustrations and photomicrographs under a differential interference contrast microscope. A key to the four species of the genus Agauopsis recorded from Korea is also p2

Copidognathus daguilarensis (Acari: Halacaridae), a New Record of the Copidognathus gibbus Group from Korea

A halacarid species of the genus Copidognathus is newly reported from Korea: C. daguilarensis Bartsch, 1997, which was described from Hong Kong. It is redescribed herein with detailed illustrations. Korean specimens coincide well with the original description, however, they showed two minor morphological discrepancies from it: quite shorter second palpal segment than the fourth and a modified dorsal seta on the second palpal segment. Korean specimens were rather smaller than the type specimens from Hong Kong, however, they did not show significant differences in the length to width ratios of important body parts. The number of perigenital setae was more variable in the Korean males, ranged 24-29 setae, versus 25-26 in Hong Kong’s. Copidognathus daguilarensis is reported for the first time outside the type locality, and joins as the second member of the gibbus group in the northwest Pacific.22Nkc

Two new species of the genus Agauopsis (Acari: Halacaridae) from Korea

Two halacarid species of the genus Agauopsis Viets, 1927, which are tentatively new to science, are reported from Jeju Island and southern coast of the Korean peninsula. They were collected by washing coralline algae, barnacles on intertidal rocks, and subtidal sediments. Agauopsis sp. 1, belonging to the ornata group, is allied to three congeneric species in bearing one pectinate seta on tibia II: A. pseudoornata Bartsch, 1985, A. calidictyota Bartsch, 2007, and A. zanzibari Chatterjee, Pesic, Chan & De Troch, 2009. However, Agauopsis sp. 1 is characteristic and distinguished from them by bearing six setae/spines of telofemur of leg II. Agauopsis sp. 2, belonging to the brevipalpus group, most resembles A. novaezelandiae Bartsch, 1986 in sharing the short frontal spine, the shorter rostrum than gnathosomal base, the fourth dorsal seta on the posterior dorsal plate, three pairs of perigenital setae in the female, and 36-37 perigenital and five pairs of subgenital setae in the male. However, Agauopsis sp. 2 is distinguished from it by the different chaetotaxy of leg II, that is, five setae/spines on genu and six on tibia (versus six and seven, respectively, in A. novaezelandiae). We provide description of the two species from Korea with detailed illustrations, and make systematic accounts of them, based on the tabular keys for each of the two species groups. A key to halacarid species of the genus Agauopsis hitherto k1

Development of Rerofitting System for the Remodeling of Reinforced Concrete Frame Using High Ductile Fiber Composite Mortar PC Panel

초록 Three reinforced concrete rigid frames and infilled rigid frames with new retrofitting system were tested under both vertical and cyclic loadings, Experimental programs were carried out to evaluate and improve the seismic performance of such test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation, and ductility etc. under load reversals. All the specimens were modeled in one-third scale size. For specimens(RFHPC, RFAR) designed by the improving of seismic performance of the rigid frame using the high ductile fiber composite PC panel and ALC panel system, load-carrying capacities were increased $1.45{\sim}2.28$ times, and hysteretic behavior was very stable during the final tests in comparison with the standard specimen(SRF)

Two new species of the genus Agauopsis (Acari: Halacaridae) from Korea

Two halacarid species of the genus Agauopsis Viets, 1927, which are tentatively new to science, are reported from Jeju Island and southern coast of the Korean peninsula. They were collected by washing coralline algae, barnacles on intertidal rocks, and subtidal sediments. Agauopsis sp. 1, belonging to the ornata group, is allied to three congeneric species in bearing one pectinate seta on tibia II: A. pseudoornata Bartsch, 1985, A. calidictyota Bartsch, 2007, and A. zanzibari Chatterjee, Pesic, Chan & De Troch, 2009. However, Agauopsis sp. 1 is characteristic and distinguished from them by bearing six setae/spines of telofemur of leg II. Agauopsis sp. 2, belonging to the brevipalpus group, most resembles A. novaezelandiae Bartsch, 1986 in sharing the short frontal spine, the shorter rostrum than gnathosomal base, the fourth dorsal seta on the posterior dorsal plate, three pairs of perigenital setae in the female, and 36-37 perigenital and five pairs of subgenital setae in the male. However, Agauopsis sp. 2 is distinguished from it by the different chaetotaxy of leg II, that is, five setae/spines on genu and six on tibia (versus six and seven, respectively, in A. novaezelandiae). We provide description of the two species from Korea with detailed illustrations, and make systematic accounts of them, based on the tabular keys for each of the two species groups. A key to halacarid species of the genus Agauopsis hitherto k1

Influence of ECC ductility on the diagonal tension behavior (shear capacity) of shear-wall panel

This paper presents a preliminary study on the influence of material ductility on diagonal tension behavior of shear-wall panels. There have been a number of previous studies, which suggest that the use of high ductile material such as ECC (Engineered Cementitious Composite) significantly enhanced shear capacity of structural elements even without shear reinforcements involved. The present study emphasizes increased shear capacity of shear-wall panels by employing a unique strain-hardening ECC reinforced with poly(vinyl alcohol) (PVA) short random fibers. Normal concrete was adopted as the reference material. Experimental investigation was performed to assess the failure mode of shear-wall panels subjected to knife-edge loading. The results from experiments show that ECC panels exhibit a more ductile failure mode and higher shear capacity when compared to ordinary concrete panels. The superior ductility of ECC was clearly reflected by micro-crack development, suppressing the localized drastic fracture typically observed in concrete specimen. This enhanced structural performance indicates that the application of ECC for a in-filled frame panel can be effective in enhancing seismic resistance of an existing frame in service

Bio-geographical distribution of deep-sea benthic fauna in the Northwet Pacific

한국해양과학기술