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Ostracoda: Myodocopa: Halocyprididae

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Ostracoda: Myodocopa: Halocyprididae Acta Oceanol. Sin., 2020, Vol. 39, No. 4, P. 73–83 https://doi.org/10.1007/s13131-020-1584-2 http://www.hyxb.org.cn E-mail: [email protected] A new pelagic Polyconchoecia Xiang, Chen and Du, 2018 (Ostracoda: Myodocopa: Halocyprididae) from the South China Sea Peng Xiang1*†, Yu Wang1†, Ruixiang Chen1, Youyin Ye1, Chunguang Wang1, Xiaoyin Chen1, Mao Lin1, 2* 1 Laboratory of Marine Biology and Ecology, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China 2 Collaborative Innovation Center of Deep Sea Biology, Hangzhou 310012, China Received 20 November 2018; accepted 6 May 2019 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract Halocyprid ostracods are appreciable part of ostracods floating through virtually everywhere in marine environment. In this study, we describe a new species of genus Polyconchoecia Xiang, Chen and Du, 2018, tribe Conchoeciini Chavtur and Angel, 2011, family Halocyprididae Dana, 1853 from the middle of the South China Sea. Polyconchoecia chenii sp. nov. is very close to P. commixtus Xiang, Chen and Du, 2018. But it differs from P. commixtus by the distinctions of locations of major glands of carapace and the characteristics of appendages: more posteriorly situated left asymmetric gland of carapace, no right asymmetric gland; segmented frontal organ; the endopod 2 of the first antenna with a very small seta; a- and c-setae of the first antenna with long end joint have long end joint, the b- and d-setae have no end joint, spinose e-seta without end joint; the e-seta of the second antenna is present; teeth side is distinctive; the setal counts of the mandible, maxilla, fifth limb, and sixth limb are individual. The locations of the major glands on carapace and the characteristics of the first antenna can be the key of the new species. This work is the second discovery of the genus Polyconchoecia from the world. Key words: taxonomy, Ostracoda, Halocyprididae, Conchoeciini, Polyconchoecia chenii sp. nov., new species, South China Sea Citation: Xiang Peng, Wang Yu, Chen Ruixiang, Ye Youyin, Wang Chunguang, Chen Xiaoyin, Lin Mao. 2020. A new pelagic Polyconchoecia Xiang, Chen and Du, 2018 (Ostracoda: Myodocopa: Halocyprididae) from the South China Sea. Acta Oceanologica Sinica, 39(4): 73–83, doi: 10.1007/s13131-020-1584-2 1 Introduction and abyss (van Harten, 1992; Oakley et al., 2013; Tanaka and Yas- Class Ostracoda Latreille, 1802, emend. Martin and Davis, uhara, 2016; Yamaguchi et al., 2016). In 1853, the largest family 2001 are a big group of small bivalved crustaceans. They inhabit Halocyprididae Dana, 1853 (Chavtur, 2003; Martin and Davis, almost all aquatic environments with high taxonomic diversity 2001; Brandão et al., 2019) within order Halocyprida Dana, 1853 (Karanovic, 2010). Ostracods are one of the momentous groups was erected. And then, the subfamily Conchoeciinae Müller, 1912 of marine organisms, and are functionally important in the pro- was erected under this family. In 2011, Chavtur and Angel (2011) cess of bio-geo-chemical cycles in marine ecosystem, especially designated the tribe Conchoeciini Chavtur and Angel, 2011 on the in the tropics and subtropical regions (Angel et al., 2007; George basis of the locational shifts of glands. Not long ago, Du et al. (2018) and Nair, 1980). They also play a significant participant of mar- erected genus Polyconchoecia Xiang, Chen and Du, 2018 with the ine deposition, because their calcified valves are preserved as type species P. commixtus Xiang, Chen and Du, 2018 based on the fossils (Di Celma et al., 2016). The studies of ostracods have been definite characteristics of locations of major glands on carapace. well improved in last two decades, and many new taxa have been Soon after that, genus Conchoecia Dana, 1849 was subdivided into erected (Harrison-Nelson and Kornicker, 2000; Chavtur, 2003; five genera: Conchoecia; Macrochoecilla Chavtur, 2018; Lophuroe- Lum et al., 2008; Karanovic, 2010; Chavtur and Angel, 2011; Pinto cia Chavtur, 2018; Parvidentoecia Chavtur, 2018; and Hyalocoecia and Jocqué, 2013; Xiang et al., 2017a, b, 2018; Du et al., 2018). Chavtur, 2018; and genus Parthenoecia Chavtur, 2018 was erected, These faunae might no-monophyletic, phylogeny remains indis- mainly based on characteristics of lateral gland, armature of seta-e tinct, and classification is based on typical characteristics (Fortey on the first antenna in the male, and copulatory appendage and Thomas, 1998; Yamaguchi and Endo, 2003). (Chavtur and Bashmanov, 2018). Thus far, the tribe Conchoeciini Halocyprid ostracods constitute appreciable part of marine zo- has contained 27 genera (Brandão et al., 2019). oplankton. They are floating through virtually everywhere in mar- In this study, a new species of genus Polyconchoecia from the ine environment including surface, hydrothermal vent, cold seep South China Sea was described. Foundation item: The Global Climate Change and Ocean Atmosphere Interaction Research under contract No. GASI-01-02-04; the National Natural Science Foundation of China under contract Nos 41406216 and 41506217; the project sponsored by the Scientific Research Foundation of Third Institute of Oceanography, MNR under contract No. 2017009; the National Special Project on Gas Hydrate of China under contract No. DD20190218. *Corresponding author, E-mail: [email protected]; [email protected] †These authors contributed equally to this work. 74 Xiang Peng et al. Acta Oceanol. Sin., 2020, Vol. 39, No. 4, P. 73–83 2 Methods Inc., Illinois, USA). Observations were done by a Carl Zeiss Axio Imager Z2 differential interference contrast microscope system 2.1 Sampling and morphological methods with AxioVision Image-Pro software (Carl Zeiss Inc., Oberkochen, Collections were obtained from two cruises of the South Germany). All drawings were made from micro-images of dissec- China Sea in 2014–2015. All zooplankton specimens were collec- ted appendages, followed the methodology in Chavtur and Angel ted using a Multinet sampling system (Type Midi, Mesh-size (2011), and further processed with Adobe Photoshop CS6 (Adobe aperture 200 μm, HydroBios Inc., Kiel, Germany) by vertical and Inc., San Jose, CA, USA). stratified hauls from bottom to surface. Collections were pre- The type specimens/appendages were deposited in the Mar- served by immersion in 5% buffered formaldehyde. ine Biological Sample Museum of the Chinese Offshore Investig- Specimens were dissected under a Carl Zeiss Discovery V20 ation and Assessment, Third Institute of Oceanography, MNR zoom-stereomicroscope. Dissected appendages were mounted (Xiamen, China), under the collection numbers TIO-OHH-PP- in permanent slides with CMC-9AF medium (Masters Company 201 to TIO-OHH-PP-204. a c 1 000 μm 500 μm b 1 000 μm Fig. 1. Polyconchoecia chenii sp. nov. (♀). a. Left valve, external view; b. carapace, internal view; and c. postero-ventral corner of right valve, internal view. Xiang Peng et al. Acta Oceanol. Sin., 2020, Vol. 39, No. 4, P. 73–83 75 2.2 Nomenclatural acts urn:lsid:zoobank.org:pub:C8D3334A-AA1C-4355-AB53- The electronic edition of this article conforms to the require- 140B299051B0. The electronic edition of this work was published ments of the amended International Code of Zoological Nomen- in a journal with an ISSN, and has been archived and is available clature, and hence the new names contained herein are avail- from the following digital repositories: SpringerLink, PubMed able under that code from the electronic edition of this article. Central, LOCKSS. This published work and the nomenclatural acts it contains have been registered in ZooBank, the online registration system for the 3 Results ICZN. The ZooBank LSIDs (Life Science Identifiers) can be re- solved and the associated information viewed through any stand- 3.1 Systematics ard web browser by appending the LSID to the prefix Oder Halocyprida Dana, 1853 “http://zoobank.org/”. The LSID for this publication is: Family Halocyprididae Dana, 1853 a b 100 μm 200 μm c 50 μm d e f 500 μm 50 μm 100 μm Fig. 2. Polyconchoecia chenii sp. nov. (♀). a. First antenna and frontal organ, external view; b. tip of first antenna, external view; c. tip of frontal organ, external view; d. detail of e-seta, external view; e. second antenna, external view; and f. exopod of second antenna, external view. 76 Xiang Peng et al. Acta Oceanol. Sin., 2020, Vol. 39, No. 4, P. 73–83 Subfamily Conchoeciinae Müller, 1912 Oceanography, MNR, in recognition of his important contribu- Tribe Conchoeciini Chavtur and Angel, 2011 tions of marine ostracods of China. Genus Polyconchoecia Xiang, Chen and Du, 2018 Holotype. No. TIO-OHH-PP-201, adult female, length Species Polyconchoecia chenii Xiang, Wang and Chen sp. nov. 2.57 mm, height 1.47 mm from Sta. CS-068 (14°31′N, 114°54′E) in the top of the South China Sea, 200–500 m water layer, 12 Janu- 3.2 Species Polyconchoecia chenii sp. nov. ary 2015. Specimen was dissected on slide and deposited in the Figs 1–8 Marine Biological Sample Museum, in the Third Institute of LSID: urn:lsid:zoobank.org:act:9B60314F-EE85-46C7-8213- Oceanography, MNR, China (Xiamen, China). 737601ED74D8 Paratypes. No. TIO-OHH-PP-202, adult female, length Etymology. Latinized name of Ruixiang Chen, our teacher, a 2.33 mm, height 1.35 mm, No. TIO-OHH-PP-203, adult female, scientist of the planktonic research group, Third Institute of length 2.45 mm, height 1.41 mm, from the same locality of the a c 50 μm 200 μm b d 50 μm 50 μm e 100 μm Fig. 3. Polyconchoecia chenii sp. nov. (♀). a. Details of swimming seta of second antenna, external view; b. terminal seta of second antenna, external view; c. mandible, internal view; d. exopod of mandible, internal view; and e. coxal endite of left mandible, internal view. Xiang Peng et al. Acta Oceanol. Sin., 2020, Vol.
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