https://repository.kopri.re.kr/handle/201206/5332 Fri, 17 Apr 2026 11:56:56 GMT 2026-04-17T11:56:56Z https://repository.kopri.re.kr/handle/201206/10980 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. Fri, 01 Nov 2019 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/10980 2019-11-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/7520 Title: Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head Authors: Park, Tae-Yoon S.; JAKOB VINTHER; Arne Thorshøj Nielsen; Fletcher Young; David A.T. Harper; M. Paul Smith; Lee, Won Young; Park, Changkun; Woo, Jusun; Kim, Ji-Hoon Abstract: Recent discoveries of fossil nervous tissue in Cambrian fossils have enabled tracing the origin and evolution of the complex arthropod head and brain based on stem groups close to the origin of the clade, rather than on extant, highly derived members. Here we show that Kerygmachela from Sirius Passet, North Greenland, a primitive stem-group euarthropod, exhibits a diminutive (protocerebral) brain that innervates both the eyes and frontal Q1 appendages. It has been surmised, based on developmental evidence, that the ancestor of vertebrates and arthropods had a tripartite brain, which is refuted by the fossil evidence Q2 presented here. Furthermore, based on the discovery of eyes in Kerygmachela, we suggest that the complex compound eyes in arthropods evolved from simple ocelli, present in onychophorans and tardigrades, rather than through the incorporation of a set of modified limbs Mon, 01 Jan 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/7520 2018-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/12357 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. Mon, 01 Jan 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/12357 2018-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/12618 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. Mon, 01 Jan 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/12618 2018-01-01T00:00:00Z