See discussions, stats, and author profiles for this publication at: http://www.researchgate.net/publication/267210054 Early Permian Ostracods from Mugi County, Gifu Prefecture, Central Japan ARTICLE in PALEONTOLOGICAL RESEARCH · JUNE 2012 Impact Factor: 0.47 · DOI: 10.2517/1342-8144-16.2.088 READS 34 5 AUTHORS, INCLUDING: Gengo Tanaka Aihua Yuan Kumamoto University China University of Geosciences 49 PUBLICATIONS 139 CITATIONS 8 PUBLICATIONS 46 CITATIONS SEE PROFILE SEE PROFILE Masahiro Ichida Haruyoshi Maeda Kyoto University Kyushu University 2 PUBLICATIONS 5 CITATIONS 46 PUBLICATIONS 274 CITATIONS SEE PROFILE SEE PROFILE Available from: Aihua Yuan Retrieved on: 15 October 2015 Early Permian Ostracods from Mugi County, Gifu Prefecture, Central Japan Author(s): Gengo Tanaka, Teruo Ono, Aihua Yuan, Masahiro Ichida and Haruyoshi Maeda Source: Paleontological Research, 16(2):88-106. 2012. Published By: The Palaeontological Society of Japan DOI: http://dx.doi.org/10.2517/1342-8144-16.2.088 URL: http://www.bioone.org/doi/full/10.2517/1342-8144-16.2.088 BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/terms_of_use. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. 88Paleontological Research, vol. 16, no. 2, pp. 88–106, June 30,Gengo 2012 Tanaka et al. © by the Palaeontological Society of Japan doi:10.2517/1342-8144-16.2.088 Early Permian ostracods from Mugi County, Gifu Prefecture, central Japan 1 2 3 4 4 *(1*27$1$.$ 7(582212 $,+8$<8$1 , MASAHIRO ICHIDA AND+$58<26+,0$('$ 1Gunma Museum of Natural History, 1674-1 Kamikuroiwa, Tomioka, Gunma 370-2345, Japan (e-mail: [email protected]) 21552-141, Honden, Mizuho City, Gifu 501-0236, Japan (e-mail: [email protected]) 3Key Laboratory of Bio- and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074 China (e-mail: [email protected]) 4Department of Geology and Mineralogy, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan (e-mail: [email protected]; [email protected]) Received May 17, 2011; Revised manuscript accepted October 21, 2011 Abstract. The Early Permian organic-rich black coloured limestone from Mugi County, Gifu Prefecture, FHQWUDO-DSDQZDVVDPSOHGIRURVWUDFRGV(OHYHQVSHFLHVEHORQJLQJWRVL[JHQHUDZHUHLGHQWL¿HG7KLVRVWUD- FRGDVVHPEODJHLVWKH¿UVWUHSRUWRI3DODHR]RLFVSHFLHVIURPFHQWUDO-DSDQ1LQHVSHFLHVDUHQHZAmphissites gifuensis Tanaka and Yuan sp. nov., Aurikirkbya miyakei Tanaka and Ono sp. nov., Glyptopleura mugiensis Tanaka and Yuan sp. nov., Bairdia fujisan Tanaka and Maeda sp. nov., Bairdia ikeyai Tanaka sp. nov., Bairdia spindlica Tanaka and Yuan sp. nov., Bairdia minoensis Tanaka and Ono sp. nov., Microcheilinella subovata Tanaka and Maeda sp. nov., and Microcheilinella tsubogawensis Tanaka and Ichida sp. nov. .H\ZRUGV-DSDQ0XJL&RXQW\2VWUDFRGD3DODHRFRSLGD3HUPLDQ3RGRFRSLGD Introduction this taxon as an extinct group of bivalved Arthropoda. In the present study, we have followed their opinion and The study of Japanese Palaeozoic Ostracoda was excluded the Leperditicopida from the Ostracoda. inspired by Ishizaki (1963), who described 14 species Some sixty species of Palaeozoic ostracods have now from the Carboniferous Nagaiwa Formation of north- been reported from Japan. The number of described eastern Japan. He subsequently (1964a) reported anothor species from Palaeozoic strata from Japan is extremely 22 species, including 15 new ones from the Middle low compared with those in other countries. The number Permian Iwaizaki Limestone from northeastern Japan, and of Cenozoic to Recent ostracod species described from 9 new species (Ishizaki, 1964b) from the Carboniferous Japan and its adjacent areas amounts to over 900 species strata around Japan. Three years later (Ishizaki, 1967) (Ikeya et al., 2003). Our Japanese Palaeozoic Ostracoda he reported 12 new species from the Carboniferous Research Team has investigated Palaeozoic strata around Tassobe Formation, northeastern Japan, and then in Japan and found many fossil localities containing 1968 described 2 new species from the Carboniferous RVWUDFRGVSHFLPHQV7KHDLPRIWKHWHDPLVWR¿QGDQG Takezawa Formation, northeastern Japan (Ishizaki, describe Palaeozoic ostracods from Japan. The present 1968). Adachi and Igo (1980) reported a new genus and VWXG\LVWKH¿UVWUHSRUWRI(DUO\3HUPLDQRVWUDFRGVIURP species, Palaeoleperditia fukujiensis, from the Devonian central Japan. (see Kurihara, 2003) Yoshiki Formation of Fukuji, Gifu Prefecture, central Japan. However, according to Vannier Geological Setting et al. (2001) and Williams and Siveter (2008), the Leperditicopida are not Ostracoda, rather they classify Middle Jurassic to earliest Cretaceous sedimentary 䚓 Figure 1. A, B, index map and route map of the study area in the Mugi County, Gifu Prefecture, central Japan (B, after a 1:25,000 scale topographic map Kami-asou published by the Geospatial Information Authority of Japan, Ministry of Land, Infrastructure, Transport and Tourism, Japan); C,JHRORJLFDOPDSDURXQGWKHVWXG\DUHD PRGL¿HGIURP0L]XWDQLDQG.RLGR Permian ostracodes from Japan 89 90 Gengo Tanaka et al. Figure 2. Characteristic fusulinoidean foraminifers from an organic-rich black limestone slab from the Mugi County, Gifu Prefecture, central Japan. 1, Pseudofusulina paratschernyschewi Kanuma; 2, Parafusulina sp; 3, Misellina cf. parvicostata (Deprat); 4, Mesoschuber- tella sp. A. Scale A for 1, 2; B for 3, 4. rocks and associated Permian bedded cherts, limestones otai (Sakaguchi and Sugano, 1966) Zone which indicates and basalts are widely distributed in the Mino district, DPLGGOH%RORULDQDJH ODWH(DUO\3HUPLDQ central area of Gifu Prefecture, central Japan (Figure 1). Based on a region enclosed by faults, four geological Materials and methods units have been recognised in the Mino district: Nabi 8QLW)XQDIXVH\DPD8QLW.DQD\DPD8QLWDQG.DPLDVR A total of about 10 kg of organic-rich black limestone 8QLW :DNLWD 7KLV VWXG\ DUHD LV D SDUW RI WKH slabs was collected from the Tani-gawa River, a branch .DPLDVR 8QLW ZKLFK LV FKDUDFWHULVHG E\ DQ DVVHPEO\ of the Tsubo-gawa River, Tominoho, Mugi County, of tectonic slices composed of ‘toishi (which means Gifu Prefecture, central Japan. The Permian black whetstone in Japanese)’ type siliceous claystone, bedded limestones are exposed in the northwestern part of this chert, siliceous mudstone, alternating sandstone and locality (Figure 1C). The slabs used in this study may be mudstone, and massive sandstone, in ascending order. GHULYHGIURPWKDWUHJLRQ(DFKODUJHVODEZDVVSOLWLQWR The brecciated conglomerates are dispersed in the approximately 1–2 cubic centimetre(s), and dried in an Tominoho area located in the northern part of Mugi oven at 60ºC. Dried rock samples, of 80 g each, from a County (Figure 1B, C). Most of the gravels in the total of 12 samples were placed on a 16 mesh (1 mm) conglomerate are cherts. Gravels of siliceous mudstone, VLHYHDWWDFKHGEHORZWRDPHVK ȝP VLHYHDQG mudstone, sandstone, shale, limestone and basalt also DUUDQJHGLQDEXFNHWZKHUHWKHVLHYHVZHUH¿OOHGZLWK occur. 5% acetic acid. The bucket remained standing for about Fusulinoidean foraminifers were recovered from two weeks at room temperature. After that, the sieves a drifted organic-rich black limestone slab (Figure were picked up and rinsed in water inside a big bucket 7KH VSHFLHV LGHQWL¿HG LQFOXGH Pseudofusulina to remove the acetic acid from the residue that contained paratschernyschewi Kanuma, Pseudofusulina sp., Para- the ostracod fossils. The residues were collected into a fusulina sp., Misellina cf. parvicostata (Deprat), beaker and dried in an oven at 60º for three days. The Schubertellidae? gen. et sp. indet., Mesoschubertella sp. specimens were picked under a binocular microscope A, and Mesoschubertella VS % $FFRUGLQJ WR 8HQR 1LNRQ60=$ DW;PDJQL¿FDWLRQDQGVWRUHGLQ (1991, 1996), M. cf. parvicostata (Deprat) occurs in the faunal slides. middle part of the Misellina (Brevaxina) dyhrenfurthi Permian ostracodes from Japan 91 Systematic Palaeontology Table 1. Fossil ostracods from the Middle Permian limestone from the Mugi County, Gifu Prefecture, central Japan. The morphological terms used are based on Moore species name N (1961) and Scott (1961). The following abbreviations are used in the descriptions: L = length, H = height, W = Amphissites gifuensis sp. nov. 27 Aurikirkbya miyakei sp. nov. 30 width, N = number of specimen. Aurikirkbya sp. 1 A total of 308 specimens belonging to 11 species were Bairdia fujisan sp. nov. 28 found from the residues (Table 1). The leading species is Bairdia ikeyai sp. nov. 41 Bairdia minoensis sp. nov., followed by Bairdia ikeyai Bairdia minoensis sp. nov. 90 sp. nov., Bairdia spindlica sp. nov., Aurikirkbya miyakei Bairdia spindlica sp. nov. 41 Glyptopleura mugiensis sp. nov. 30 sp. nov. and Glyptopleura