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An Updated Checklist and Perspective Study of Millipedes (Arthropoda: Myriapoda: Diplopoda) in the Korean Peninsula
  • 비영리 CC BY-NC
  • 비영리 CC BY-NC
ABSTRACT

The Korean peninsula has diverse habitats and so would be expected to have a rich millipede fauna because of its location between the Paleoarctic and Oriental regions. To facilitate studies on millipedes, this work provides an updated list and discussion of Korean millipedes. A total of 69 species had been recorded up to 2010, but since then no new species have been reported. Among 69 species, 49 are endemic to the Korean peninsula. From 1950 to the present, an average of only seven new species from the Korean peninsula has been described per decade. This number does not reflect the biodiversity of millipedes in Korea, especially when compared to Taiwan, which has only one-third the area of the Korean peninsula, but from which a greater number of millipede species have been recorded (75 vs. 69 species). Japan has twofold the land area of the Korean peninsula, and an almost threefold higher number of millipede species. Further, more-intensive surveys will likely result in identification of more millipede species in the Korean peninsula.


KEYWORD
Millipedes , Diplopoda , updated list , endemism , Korean peninsula
  • INTRODUCTION

    Millipede (class Diplopoda) is one of the most diverse and ancient groups in nature (Bueno-Villegas et al., 2004; Golovatch and Kime, 2009). To date, about 10,000 species have been described, but 80,000 species are estimated to exist (Bueno-Villegas et al., 2004; Golovatch and Kime, 2009). Millipedes are sarcophagous animals that feed on leaves and tree branches, and play important roles in ecosystems. Their activities accelerate the decay of organic matter, and return materials and nutrients to the ecosystem (Hopkin and Read, 1992; Golovatch and Kime, 2009). Furthermore, millipedes may provide a cure for acquired immune-deficiency syndrome and other serious diseases (Jiang et al., 1981). Therefore, a greater understanding of millipedes will enable more-effective control, use and/or protection of bio-resources.

    The Korean peninsula (=Korea, hereafter) is located in northeast Asia. The region’s topography is complex, with mountainous areas in the northern and eastern parts and large plains in the southern and western parts; mountains and plains are in some areas integrated. Due to its diverse topography and habitats, the Korean peninsula would be expected harbor a rich millipede fauna.

    The millipedes of the Korean peninsula were studied beginning in the late 19th century, and investigations continued during the 20th century. Some important publications need to be taken into account such as Verhoeff (1936, 1937a, 1937b, 1938), Takakuwa (1940). The first list of millipedes in Korea was simply presented by Takakuwa and Kakashima (1940, 1944). The list was updated by Paik (1958) containing 22 species; several species were added later and summarized in the other list, which included 33 species (Lim, 1988). Lim (2001) summarized 48 species in his dissertation. This list is out of date due to recent discoveries of new species (Mikhaljova and Lim 2006a, 2006b, 2006c, 2008). Lim (2011) presented the list of 50 species plus 2 subspecies in 28 genera, 13 families and seven orders reported from the Korean peninsula. The most recent list was published by Lim (2013) in the National List of Species of Korea. This list contains 69 species in 32 genera, 15 families of seven orders. However, as species record confirmation and taxonomic treatment made by Mikhaljova (2001), Golovatch (2011), the list of Korean millipedes need to be updated. Thus, the present work aimed to provide an updated list of millipedes inhabiting Korea, a discussion of the millipede fauna, and comparison with neighboring countries. The updated list was compiled based on the previous studies of millipedes in Korea.

    RESULTS AND DISCUSSION

    A total of 69 species belonging to 31 genera, 15 families, and seven orders has been recorded in the Korean peninsula (Tables 1, 2). In comparison with the previous list presented by Lim (2013), Angorozonium bonum (Mikhaljova, 1979) was excluded from the list of Korean millipedes as discussed by Mikhaljova (2001); Oxidus obtusus (Takakuwa, 1942) was re-added; and Koreadesmus proprius Mikhaljova & Korsós, 2003 was reallocated to the genus Cawjeekelia by Golovatch (2011). The millipede fauna of Korea was dominated by julidan and polydesmidan species (20 and 25 species, respectively).

    [Table 1.] An updated list of millipedes in Korea

    label

    An updated list of millipedes in Korea

    [Table 2.] Number of recorded millipede species in Korea

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    Number of recorded millipede species in Korea

    The millipede fauna of Korea has high endemism. Of the 69 species, 49 are considered to be endemic because they are found only in Korea; the following 10 species are present in both Korea and the Asian part of Russia: Ansiulus matumotoi, Skleroprotopus coreanus, Anaulaciulus golovatchi, Diplomaragna kedrovaya, Orientyla dahurica, Levizonus variabilis, Sichotanus eurygaster, Cawjeekelia koreana, Epanerchodus koreanus, and Epanerchodus polymorphus. Another 10 species are found in both Korea and Japan: Amblyiulus lobatus, Brachycybe nodulosa, Diplomaraga gracilipes, Riukiuria semicircularis, Orthomorphella pekuensis, Oxidus gracilis, Oxidus obtusus, Nedyopus patrioticus, Epanerchodus bifidus, and Rhipidopeltis sinuata.

    Of 69 species, Oxidus gracilis is widely distributed in the subtropics and tropics, and Orthomorphella pekuensis is present in China, Japan, and Taiwan (Nguyen and Sierwald, 2013). Two doubtful species, Pachydesmus bazanensis and Oxidus obtusus, need to be revised due to they have not been re-found in Korea since their description.

    Of 16 known millipede orders, only seven have been recorded in Korea. Some orders, such as Siphonophorida, Spirobolida, Spirostreptida, are found in Japan, China, and Taiwan, but not in Korea to date. Theoretically, Korea is located within the distributional regions of those orders (Shelley and Golovatch, 2011); thus, those orders could be present in Korea and awaiting discovery.

    The number of new species found in Korea has increased slowly, with an average of seven new species per decade since 1950 (Fig. 1). The majority of new species (15 species) were described during 2001-2010; however, no new species have been discovered in Korea since 2010.

    In comparison with neighboring countries, Korea has medium area, but only 69 species have been recorded. In contrast, Taiwan is a small island, but 75 species have been recorded to date (Fig. 2). Japan is larger, and almost 300 millipede species have been identified to date. Korea is smaller than Vietnam in terms of land area, but has only one-third the number of millipede species. This suggests that the millipede fauna of Korea have not been the subject of sufficient investigations. Further undescribed species may await discovery in Korea.

    Korea is considered a valuable site for speciation and evolution studies because of its function as a geographical bridge between the Asian continent and the Pacific Ocean (Lim, 2001). The poor understanding of millipede fauna has impaired our understanding of millipede speciation and evolution. Therefore, further in-depth surveys of the millipedes of Korea are warranted.

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이미지 / 테이블
  • [ Table 1. ]  An updated list of millipedes in Korea
    An updated list of millipedes in Korea
  • [ Table 2. ]  Number of recorded millipede species in Korea
    Number of recorded millipede species in Korea
  • [ Fig. 1. ]  Number of millipede species recorded in Korea from 1950 to the present.
    Number of millipede species recorded in Korea from 1950 to the present.
  • [ Fig. 2. ]  Number of millipede species from Korea and four Asian neighboring countries in comparison to their territorial sizes. Data sources: Asian part of Russian from Mikhaljova (2004); Japan from Murakami (1993); Taiwan from Korsos (2004) plus Chen et al. (2006, 2008, 2010), Mikhaljova et al. (2010); and Vietnam from Enghoff et al. (2004), plus Nguyen et al. (2005), Golovatch and Nguyen (2007), Nguyen (2009, 2010a, 2010b, 2011, 2012).
    Number of millipede species from Korea and four Asian neighboring countries in comparison to their territorial sizes. Data sources: Asian part of Russian from Mikhaljova (2004); Japan from Murakami (1993); Taiwan from Korsos (2004) plus Chen et al. (2006, 2008, 2010), Mikhaljova et al. (2010); and Vietnam from Enghoff et al. (2004), plus Nguyen et al. (2005), Golovatch and Nguyen (2007), Nguyen (2009, 2010a, 2010b, 2011, 2012).
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