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ISSN : 1226-9999(Print)
ISSN : 2287-7851(Online)
Korean J. Environ. Biol. Vol.33 No.2 pp.177-181
DOI : https://doi.org/10.11626/KJEB.2015.33.2.177

New Report of Two Species of Genus Pentias (Crustacea: Malacostraca: Isopoda) from South Korea

Ji-Hun Song, Gi-Sik Min*
Department of Biological Sciences, Inha University, Incheon 402-751, Korea
Corresponding author: Gi-Sik Min, Tel. 032-860-7692, Fax. 032-874-6737, mingisik@inha.ac.kr
May 6, 2015 June 10, 2015 June 11, 2015

Abstract

Two marine isopods, Pentias hayi Richardson, 1904 and P. thompsoni Collinge, 1916 were verified as unrecorded species in South Korea. The genus Pentias is reported for the first time in South Korea. These two isopods were collected from Heuksan-do Island and Ulleung-do Island from South Korea, respectively. We provide descriptions of the diagnostic characteristics, illustrations of two species and their partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) for molecular characteristics.


초록


    MinMinistry of Environment
    NIBR No. 2014-02-001
    NIBR201501201

    INTRODUCTION

    The genus PentiasRichardson, 1904 is one of 22 genera belonging to the family Idoteidae Samouelle, 1819 that currently comprises four species (Poore and Schotte 2015). The genus Pentias is reported for the first time in South Korea.

    We provide detailed descriptions of the diagnostic characteristics, illustrations and partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) of the two species: Pentias hayiRichardson, 1904 and Pentias thompsoni Collinge, 1916. Additionally, a key to the worldwide species of Pentias is provided.

    MATERIALS AND METHODS

    1.Sample collection

    The specimens of Pentias hayi and P. thompsoni were collected with light traps from Heuksan-do Island and Ulleung- do Island in South Korea, respectively. They were preserved directly in 95% ethyl alcohol after collection. All examined specimens were deposited in the National Institute of Biological Resources (NIBR) and Inha University, South Korea.

    2.Morphological analysis

    Specimens were observed and dissected under a stereomicroscope (Model SZX-7; Olympus, Tokyo, Japan). Illustrations of appendages were made with a drawing tube connected to a light microscope (Model DM 2500; Leica, X50- 630, Wetzlar, Germany). Drawings of whole bodies were made using a drawing tube attached to a stereomicroscope (Olympus SZX-12). Measurements of appendages and whole body lengths were taken using a stage micrometer (Leica, Germany) and an ocular micrometer.

    3.DNA sequencing

    The CO1 sequences were determined according to the method used in the paper by Song and Min (2015) with two primers: jgLCO1490 5′- TITCIACIAAYCAYAARGAYATT GG-3′ and jgHCO2198 5′-TAIACYTCIGGRTGICC RAA RAAYCA-3′(Geller et al. 2013).

    RESULTS AND DISCUSSION

    Order Isopoda Latreille, 1817 등각목

    Suborder Valvifera Sars, 1882 유변아목

    Family Idoteidae Samouelle, 1819 주걱벌레과

    Genus PentiasRichardson, 1904

    거친다리주걱벌레속 (신칭)

    1.Pentias hayiRichardson, 1904 길쭉거친다리주걱벌레 (신칭) (Fig. 2)

    Synonyms: Pentias hayiRichardson, 1904: 47, figs. 24, 25.

    Material examined: Korea: 1 female (NIBRIV00003077 57), Heuksan-do Island, Sinan-gun, Jeollanam-do, 34°40′N, 125°26′E, Apr 3 2012, depth 3~4 m, collected with light traps by Song JH (Fig. 2).

    Diagnosis: Body elongated, about 5 times longer than wide, 17.1 mm; coxae 6~7 occupy whole lateral margin. Maxillipedal palp with five articles. Pleotelson very long, with 3 incomplete sutures, almost equal in length to last five pereonites (3~7). All pereopods robust and short, with distinct bi-unguiculate dactylus. Coxal plates well visible dorsally on pereonites 2~7.

    Remarks: In general, the material of Pentias hayi collected from South Korea is well agreed with the original description of Richardson (1904). Pentias hayi is very similar to P. namikawaiNunomura (2006) in external features. However, P. hayi differs from P. namikawai in the ratio between length and width in body; coxal plates on pereonites 2~7. Body almost 5 times longer than wide; coxal plates well visible dorsally on pereonites 2~7 in P. hayi. But, body almost 7.8 times longer than wide; coxal plates hardly visible dorsally on pereonites 2~7 in P. namikawai.

    Habitat: This species collected from the South Korea on sandy and gravel bottom with some algae at 3~4 m depth.

    World distribution: Japan (Richardson 1904), Korea.

    Deposition: NIBR No. NIBRIV0000307757.

    Molecular characteristic: GenBank accession number: KR261927.

    Identifiers: Ji-Hun Song, Gi-Sik Min.

    2.P entias thompsoni Collinge, 1916 넓적거친다리주걱벌레 (신칭) (Fig. 3)

    Synonyms: Pentias thompsoni Collinge, 1916: 1, pl. 3, figs. 1-10. Fig. 2-3

    Material examined: Korea: 1 female (NIBRIV00003144 09), Ulleung-do Island, Ulleung-gun, Gyeongsangbuk-do, 37°28′N, 130°54′E, Jul 20 2013, depth 3~4 m, collected with light traps by Song JH (Fig. 1).

    Diagnosis: Body oblong ovate, about 3.5 times longer than wide, convex dorsally, 9.3 mm. Pleotelson narrower than pereonites 2~7, with 1 complete suture and 2 incomplete sutures. All pereopods robust and short, with distinct bi-unguiculate dactylus. Pleotelson have 1 complete suture and 2 incomplete sutures.

    Remarks: In general, the material of Pentias thompsoni collected from South Korea is well agreed with the original description by Collinge (1916). Pentias thompsoni is distinctly different from all other species of Pentias: (1) pleotelson have 1 complete suture and 2 incomplete sutures (other species have 3 incomplete sutures) and (2) relative wider body, about 3.5 times longer than wide (more than 5 times longer than wide in other species).

    Habitat: This species collected from the South Korea on sandy and gravel bottom with some algae at 3~4 m depth.

    World distribution: Japan (Collinge 1916), Korea.

    Deposition: NIBR No. NIBRIV0000314409.

    Molecular characteristic: GenBank accession number: KR261928.

    Identifiers: Ji-Hun Song, Gi-Sik Min.

    3.Pentias arimotoiRafi, 1973 Synonyms: Pentias arimotoiRafi, 1973: 1041, figs. 1, 2.

    4.Pentias namikawaiNunomura, 2006 Synonyms: Pentias namikawaiNunomura, 2006: 27, fig. 9.

    Key to the worldwide species of the genus Pentias

    1.The pleotelson with 1 complete suture and 2 incomplete

    sutures (1+2)················································P. thompsoni - The pleotelson with 3 incomplete sutures (0+3)·············2

    2. Pereonites 5~7 with dorsally invisible coxal plates·········· ··········································································P. arimotoi - Pereonites 5~7 with dorsally visible coxal plates···········3

    3. Body almost 5 times longer than greatest width; coxal plates well visible dorsally on pereonites 2~7·······P. hayi - Body almost 7.7 times longer than greatest width; coxal plates hardly visible dorsally on pereonites 2~7··············· ······································································P. namikawai

    Figure

    KJEB-33-177_F1.gif

    The collection locality of two species of genus Pentias in this study: Pentias hayi, Heuksan-do Island, Sinan-gun, Jeollanam-do (▲); Pentias thompsoni, Ulleung-do Island, Ulleung-gun, Gyeongsangbuk-do (■).

    KJEB-33-177_F2.gif

    Pentias hayi, female. A, body, dorsal view; B, pereopod 1; C, maxilliped. Scale bars: A=2 mm, B=0.2 mm, C=0.1 mm.

    KJEB-33-177_F3.gif

    Pentias thompsoni, female. A, body, dorsal view; B, pereopod 1; C, maxilliped. Scale bars: A=1 mm, B=0.2 mm, C=0.1 mm.

    Table

    Reference

    1. Collinge W (1916) Description of a new species of Marine Isopoda of the genus Pentias , Richardson. Int. J. Zool. R, Vol.1; pp.33-35
    2. Geller J , Meyer C , Parker M , Hawk H (2013) Redesign of PCR primers for mitochondrial cytochrome c oxidase subunit I for marine invertebrates and application in all-taxa biotic surveys , Mol. Ecol. Resour, Vol.13; pp.851-861
    3. Nunomura N (2006) Marine Isopod Crustaceans in the Sagami Sea , Central Japan. Memoir. Natl. Sci. Mus, Vol.41; pp.7-42
    4. Schotte M , Boyko CB , Bruce NL , Poore GCB , Taiti S , Wilson GDF (2015) World Marine, Freshwater and Terrestrial Isopod Crustaceans database, Accessed through: World Register of Marine Species at www.marinespecies.org/aphia.php?p=taxdetails&id=249156 on 2015-03-30
    5. Rafi F (1973) A new species of the genus Pentias Richardson (Isopoda, Valvifera) from the Sea of Japan , Can. J. Zool, Vol.51; pp.1041-1045
    6. Richardson H (1904) Contributions to the natural history of the Isopoda , Proc. Unit. States. Natl. Mus, Vol.27; pp.1-89
    7. Song JH , Min GS (2015) Two new species, Caenanthura koreana sp. nov. and Apanthura koreaensis sp. nov. (Crustacea: Isopoda: Anthuridae) from South Korea , Zootaxa, Vol.3937; pp.362-376