https://repository.kopri.re.kr/handle/201206/9851 2026-04-05T17:48:14Z 2026-04-05T17:48:14Z Lee, Sangmin Shi, G. R. Woo, Jusun Park, Tae-Yoon S. Oh, Jae-Ryong Kim, Na Kyung Nakrem, Hans A. Tazawa, Jun-Ichi https://repository.kopri.re.kr/handle/201206/10980 2022-03-24T07:14:30Z 2019-11-01T00:00:00Z

Title: Permian spiriferellid brachiopods from northern Pangaea: taxonomy, biostratigraphy, macroevolution and implications for palaeoenvironmental and palaeobiogeographical reconstructions Authors: Lee, Sangmin; Shi, G. R.; Woo, Jusun; Park, Tae-Yoon S.; Oh, Jae-Ryong; Kim, Na Kyung; Nakrem, Hans A.; Tazawa, Jun-Ichi Abstract: This study reports diverse spiriferellid brachiopods from the Permian rocks of Svalbard and adjacent areas (Arctic Canada and Subpolar Urals of Russia) located at the northern margin of Pangaea. In total, 11 brachiopod species in four genera are recognized and described in detail, including two new species (Spiriferella protodraschei and Arcullina? enokiani). According to our taxonomic investigation, morphological characteristics of the ventral sulcus and dorsal fold are relatively stable within each species, in spite of considerable intraspecific variations in shell outline and macro-ornamentation. In addition, both the arrangement of pustules, as a shell surface micro-ornamentation, and the development of delthyrial coverings are shown to be significant features for inferring phylogenetic relationships and for defining species. The best-known but still questionable taxon, Spiriferella keilhavii, is here identified as an endemic species restricted to Bjørnøya and, possibly, to central East Greenland; it is phylogenetically closest to S. loveni. Following the taxonomic revision, the stratigraphical ranges of the spiriferellids within the Kapp Starostin Formation in Spitsbergen are fully refined: three species, S. protodraschei, A. polaris and Timaniella wilczeki, are confined to the lowermost Vøringen Member (late Artinskian？early Kungurian), whereas S. loveni dominates the overlying members with a much longer stratigraphical range (late Kungurian？Lopingian?). This abrupt compositional change, along with comparable changes in other taxonomic groups, can be explained by a palaeoclimatic shift from cool to cold conditions between the Vøringen Member and the overlying Svenskeegga member. A similar biotic transition is identified between the Hambergfjellet and Miseryfjellet formations in Bjørnøya. On the other hand, S. loveni is abundant in the Late Permian strata of central East Greenland, but there it appears to be more costate in plication compared to its counterpart from Spitsbergen. It is suggested that this alteration in shell ornamentation may represent a possible response (adaptation) to warming arising from the southward migration of the species.

2019-11-01T00:00:00Z Kim, Ji-Hoon Kim, Sanghee Park, Tae-Yoon S. https://repository.kopri.re.kr/handle/201206/12357 2022-03-24T07:15:40Z 2018-01-01T00:00:00Z

Title: The new species of Dactylobiotus (Parachela, Eutardigrada) from King George Island, Antarctica Authors: Kim, Ji-Hoon; Kim, Sanghee; Park, Tae-Yoon S. Abstract: Limno-terrestrial tardigrades form one of the most dominant groups in the scanty terrestrial freshwater ecosystem of Antarctica. However, due to their limited key morphological characters and restricted access to the habitats, taxonomic study on Antarctic tardigrades largely remains to be challenged. KOPRI ecology team collected several species of tardigrades near the King Sejong Station, King George Island, Antarctica during 2014-2015 season. Among the collected tardigrades, one group shows a buccal-pharyngeal apparatus with ten peribuccal lamellae, and the cuticle structure which joins two claws in each limb. These characters warrant a generic assignment Dactylobiotus. This species is quite large in size (600-700 μm) with prominent eyespots and smooth cuticle. The egg has circular or slightly hexagonal cone-type processes with a tip. Compared to D. ambiguus and D. caldarellai which have a rather similar morphology, this species shows claws with longer primary branch at all limbs. The 18S, 28S rDNA and cytochrome c oxidase subunit 1 (CO1) sequences do not correspond to any previously-reported sequence, although only limited molecular data of tardigrades have been reported so far. Based on the pt-ratio of the buccal-pharyngeal apparatus and claws, the morphology of eggs, and the DNA sequences of 3 partial genes, this species is considered as a new species of Dactylobiotus.

2018-01-01T00:00:00Z Bomfleur, Benjamin Mors, Thomas Oh, Changhwan Woo, Jusun Park, Tae-Yoon S. Crispini, Laura Laufer, Andreas https://repository.kopri.re.kr/handle/201206/12618 2022-03-24T07:15:07Z 2018-01-01T00:00:00Z

Title: New Permian-Jurassic deposits in the far North of Victoria Land, East Antarctica Authors: Bomfleur, Benjamin; Mors, Thomas; Oh, Changhwan; Woo, Jusun; Park, Tae-Yoon S.; Crispini, Laura; Laufer, Andreas Abstract: The geology of the Transantarctic Basin in the far north of Victoria Land is still poorly known. Joint Korean-Italian-German field work in the central Rennick Glacier area during the 2015-2016 season has yielded exciting new results. Based on lithology and fossil content, we recognize four distinct terrestrial sedimentary units in the area; in ascending order, (1) the Permian Takrouna Formation (thickness ~300 m) with common glossopterid remains; (2) a previously unknown unit (thickness 75+ m) mainly of reddish-weathering, commonly tabular-cross-bedded pebbly sandstone with intercalated siltstone and palaeosols, barren of body fossils but rich in trace fossils; (3) another previously unknown unit (thickness 250+ m) of olive-weathering fine-grained sandstone and thick overbank mudstone with palaeosols and thin coal seams, containing abundant silicified wood (Kykloxylon, Agathoxylon), silicified peat, and plant compressions (e.g., Heidiphyllum, Lepacyclotes) indicating a Triassic age; and (4) about 15 m of mainly conglomeratic trough-cross-bedded, medium- to coarse-grained quartzose sandstone similar to the Section Peak Formation (Rhaetian to Early Jurassic) further south. Our results reveal a much more complete Permian to Jurassic basin fill in that area than was previously thought; on-going palynological analyses should help clarify the precise stratigraphic relationships to better-known sections elsewhere in the Transantarctic Mountains and in Tasmania.

2018-01-01T00:00:00Z Park, Tae-Yoon S. Kim, Ji-Hoon Woo, Jusun Vinther, Jakob Nielsen, Arne https://repository.kopri.re.kr/handle/201206/12293 2022-03-24T07:15:36Z 2018-01-01T00:00:00Z

Title: Cambrian paleontology in North Greenland and the early animal evolution Authors: Park, Tae-Yoon S.; Kim, Ji-Hoon; Woo, Jusun; Vinther, Jakob; Nielsen, Arne Abstract: Peary Land of North Greenland is a land of the highest latitude in the northern hemisphere, but has received limited attention due to its extreme remoteness. Nevertheless, this area holds a celebrated Cambrian fossil locality, Sirius Passet (82° 47.603′ N, 42° 13.394′ W), which is a conservation Lagersttate, producing soft-bodied marine animal fossils of ca. 520 Ma. Since the first discovery of Sirius Passet in 1984, there have been only seven times of palaeontological expeditions to the area. In 2016 and 2017 seasons, expeditions led by Korea Polar Research Institute collected ca. 1.5 tons of fossil slabs from the outcrop and the scree of the Lower Cambrian Buen Formation. The fossils include various metazoans, such as sponges, arthropods, stem-group arthropods, primitive mollusks, annelids, cycloneuralians including priapulids and loriciferans, primitive deuterostomes, and possible chordates, which would help reveal the aspect of the ‘Cambrian explosion’ of the animals. This area is part of the Northeast Greenland National Park which is the world’s largest protected land area with almost no permanent human settment. North Greenland needs to be more understood in terms not only of geology, but also of ecology and other research fields. Korea Polar Research Institute is planning to visit the area for the next two years, which would bring more information on the paleontology, geology, and ecology of this remote part of the world.

2018-01-01T00:00:00Z