First Report of Two Species of Genus Raymunida (Crustacea: Decapoda: Anomura) from Korea

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  • ABSTRACT

    Two species of squat lobsters, Raymunida formosanus Lin, Chan and Chu, 2004 and Raymunida lineata Osawa, 2005, are newly added to the Korean decapod fauna. The genus Raymunida Macpherson and Machordom, 2000 is also reported for the first time in Korea. It differs morphologically from other Korean genera, Munida and Paramunida, in having the first to third pereopods with epipods and the carpus of the third maxilliped with a distal spine on flexor margin. Illustrations and pictures of these two species are provided with descriptions, and the key to the species of Korean Munidids is also provided.


  • KEYWORD

    Korean fauna , Anomura , Munididae , Raymunida , Raymunida formosanus , Raymunida lineata

  • INTRODUCTION

    The family Munididae Ahyong, Baba, Macpherson and Poore, 2010 is the most diverse family in the galatheoids and includes 421 species in 20 genera worldwide (Macpherson and Baba, 2011). However, only 2 species of 2 genera have been reported from the Korean fauna: Munida japonica Stimpson, 1858 and Paramunida scabra (Henderson, 1885) (see Kim, 1973). The genus Raymunida Macpherson and Machordom, 2000 belonging to the family Munididae accommodates 12 species (Osawa, 2012). It is separated from the genus Munida Leach, 1820 by Macpherson and Machordom (2000) based on morphological characters: 1) first to third pereopods bearing epipods; 2) frontal margin of carapace with one spine; 3) third maxilliped with carpus having one spine at flexor distal margin. As a result of study on Korean galatheoids fauna, Raymunida formosanus Lin, Chan and Chu, 2004 and Raymunida lineata Osawa, 2005 are recorded for the first time in Korea. They were collected from southern coast of Jeju Island. Of these, the northern range of geographical distribution of R. formosanus is extended from Taiwan to Jeju Island in Korea. Both species differ in the number of spines on anterior branchial regions, spination of antennal articles, and thickness of the first pereopod. In this study, illustrations, including photographs, and descriptions are provided and the key to the species of Korean munidids is also provided.

    MATERIALS AND METHODS

    The specimens examined in this study were preserved in 70% ethyl alcohol. All drawings were prepared by using camera lucida on a Nikon SMZ800 (Nikon, Tokyo, Japan). All characters were measured using an analog caliper diaMax 4112102 (Wiha, Schonach, Germany) to the nearest 0.1 mm. The terminology used follows Baba et al. (2011). The abbreviation CL refers to the carapace length measured across the middle of the carapace from the anterior border excluding rostrum to the posterior border. Higher classification follows Ahyong et al. (2011). The specimens examined in the present study are deposited in the Marine Arthropod Depository Bank of Korea (MADBK), Seoul National University.

    SYSTEMATIC ACCOUNTS

    Order Decapoda Latreille, 1802

    Superfamily Galatheoidea Samouelle, 1819

    1*Family Munididae Ahyong, Baba, Macpherson and Poore, 2010

    1*Genus Raymunida Macpherson and Machordom, 2000

    2*Raymunida formosanus Lin, Chan and Chu, 2004 (Figs. 1-3)

    Raymunida formosanus Lin, Chan and Chu, 2004: 149, figs. 1-3 (type locality: Taiwan, Tai-Shi fishing port, I-Lan County, commercial trawler, about 300 m); Ahyong and Poore, 2004: 70, fig. 17; Poore, 2004: 239, fig. 66c, d; Baba, 2005: 307; Baba et al., 2008: 179; 2009: 291, figs. 265, 266.

    Material examined. 2♂♂ (CL 18.4, 19.3 mm), Korea, Jeju Island, Seogwipo-si, 10 Oct 1970.

    Description. Carapace (Figs. 1, 2A), excluding rostrum, as long as broad; dorsal surface with distinct transverse striae; having 5 pairs of epigastric spines, with 1 pair of parahepatic spines and postcervical spines. Anterior branchial region having 4 to 5 spines. Frontal margin slightly oblique, having 1 small spine. Lateral margins somewhat convex, each with 6 spines: 2 anterolateral, 2 anterobranchial, 2 posterobranchial. Cervical groove distinct. Rostrum spiniform, 0.4 times as long as remaining carapace length. Supraocular spines 0.5 times as long as rostrum length, subparallel.

    Pterygostomian flaps slightly rugose, unarmed.

    Thoracic sternites (Fig. 2B) 0.8 times as long as broad, bearing distinct medial groove, lateral limits expanded posteriorly.

    Abdominal somites 2, 3 (Figs. 1, 2A) each having 2 uninterrupted transverse ridges.

    Eyes (Fig. 2A) subcylindrical, slightly expanded distally, overreaching supraocular spine.

    Antennular article 1 (Fig. 2C) having 2 well-developed distal spines: 1 small distomesial, 1 well-developed distolateral; bearing 2 lateral spines: 1 short proximal, 1 prominent distal, which slightly reaching tip of distolateral spine.

    Antennal article 1 (Fig. 2C) bearing 1 distomesial spine, slightly overreaching distal margin of antennal article 3. Antennal article 2 having 2 distal spines, distomesial spine

    larger than distolateral spine. Antennal articles 3, 4 unarmed.

    Maxilliped 3 (Fig. 2D) with ischium bearing 1 distal spine on flexor margin. Merus as long as ischium, with 2 prominent spines on flexor margin, distal spine slightly slender. Carpus having 1 spine on distal end of flexor margin. Propodus and dactylus unarmed. Exopod overreaching distal end of merus (excluding distal spine).

    Pereopod 1 (Figs. 1, 3A, B) stout, squamous and spinose. Merus 3.9 times as long as broad, having irregular spines on extensor and flexor margins. Carpus 2.3 times as long as broad, bearing irregular row of spines on mesial and lateral margins, dorsal surface with some spines. Palm twice as long as broad, about 1.5 times as long as movable finger, mesial and lateral margins having irregular row of spines. Fingers having 1 distinct longitudinal ridge on dorsal and ventral sides, bearing irregular row of spines; fixed finger curved; movable finger with cutting edge having 1 large tooth on proximal third.

    Pereopod 2 (Fig. 3C) slender. Ischium having 1 small spine on distoflexor margin. Merus 6.6 times as long as broad, armed with row of spines on extensor margin, flexor margin bearing row of spines on distal third. Carpus 2.2 times as long as broad, with 4 spines on extensor margin. Propodus 3.1 times longer than dactylus, 10.1 times as long as broad, flexor margin armed with 5 movable spines including distal pair: 1 distolateral, 1 distomesial (distomesial spine not illustrated). Dactylus short, curving distally, having 7 movable spines on flexor margin. Pereopod 3 (Fig. 3D) with ischium having 1 small spine on distoflexor margin; merus 4.5 times as long as broad, having row of spines on extensor margin, flexor margin bearing row of spines on distal third; carpus twice as long as broad, bearing 4 spines on extensor margin; propodus 8.8 times as long as broad, flexor margin bearing 5 movable spines including distal pair: 1 distolateral, 1 distomesial (distomesial spine not illustrated); dactylus short, curving distally, having six movable spines on flexor margin. Pereopod 4 (Fig. 3E) with ischium unarmed; merus 4.3 times as long as broad, extensor margin having row of spines; carpus

    1.8 times as long as broad, extensor margin bearing 4 low spines; propodus 7.8 times as long as broad, flexor margin bearing 5 movable spines including distal pair: 1 distolateral, 1 distomesial (distomesial spine not illustrated); dactylus short, curving distally, having 6 movable spines on flexor margin.

    Distribution. Taiwan, New South Wales of Australia and Korea.

    Remarks. Raymunida formosanus has been recorded from Taiwan and eastern Australia (Baba et al., 2009). Thus, the present specimens from Jeju Island are the most northern record of this species.

    Raymunida formosanus is morphologically similar to R. confundens Macpherson and Machordom, 2001. They share the following characteristics: the second antennal article is unarmed on mesial margin, and the frontal margin has one small spine. However, the R. formosanus can be distinguished by the following characteristics. 1) In the present species, the anterior branchial region bears four to five spines, but R. confundens, has four spines. 2) The first pereopod is robuster than that of R. confundens. 3) The second to fourth pereopods bear distinct squamae, while in R. confundens, distinct squamae absent (Lin et al., 2004).

    The present specimens agreed well with the original description (Lin et al., 2004) except for the length of the distomesial spine on antennal article 1. Lin et al. (2004) mentioned that the spine reached the first antennular article. In addition, their illustration (Lin et al. 2004, fig. 1b, f) indicated that distomesial spine on antennal article 1 overreached distal margin of antennal article 4. However, in examined specimens, the spine slightly reached distal margin of antennal article 3. Such difference seems to be a morphological variation of the species.

    1*Raymunida lineata Osawa, 2005 (Figs. 4-6)

    Munida elegantissima: Baba, 1969: 37, figs. 3, 4.

    Galathea sp. 1: Gosliner et al., 1996: 226, fig. 821.

    Raymunida lineata Osawa, 2005: 92, figs. 3-6 (type locality: Izu Peninsula, Shizuoka Prefecture, 20 m); 2012: 143; Baba et al., 2008: 180.

    Material examined. 1♂ (CL 6.4 mm), Korea, Jeju Island,

    Seogwipo-si, Songsan-dong, 8 Mar 2002.

    Description. Carapace (Figs. 4, 5A), excluding rostrum, slightly longer than broad; dorsal surface with distinct transverse striae; having 5 pairs of epigastric spines, with 1 pair of parahepatic spines and postcervical spines. Anterior branchial region having 3 spines. Frontal margin slightly oblique, having 1 small spine. Lateral margin slightly convex, each with 6 spines: 2 anterolateral, 2 anterobranchial, 2 posterobranchial. Cervical groove distinct. Rostrum spiniform, 0.5 times as long as carapace length. Supraocular spines 0.6 times as long as rostrum length, subparallel.

    Pterygostomian flap slightly rugose, unarmed.

    Thoracic sternites (Fig. 5B) 0.8 times as long as broad, bearing distinct medial groove, lateral limits expanded posteriorly; sternites 5, 6 having distinct oblique ridges on lateral part.

    Abdominal somites 2, 3 (Figs. 4, 5A) each having 2 uninterrupted and transverse ridges.

    Eyes (Fig. 5A) subcylindrial, slightly expanded distally, slightly reaching supraocular spine.

    Antennular article 1 (Fig. 5C) having 2 well-developed distal spines: 1 small distomesial, 1 well-developed distolateral; bearing 2 lateral spines: 1 short proximal, 1 prominent distal (overreaching distolateral spine).

    Antennal article 1 (Fig. 5C) bearing 1 distomesial spine, overreaching distal margin of antennal article 4. Antennal article 2 having 2 distal spines, distomesial spine larger than distolateral spine, mesial margin having small spine. Antennal article 3 bearing 1 small distomesial spine. Antennal article 4 unarmed.

    Maxilliped 3 (Fig. 5D) with ischium bearing 1 distal spine on flexor margin. Merus as long as ischium, with 2 prominent spines on flexor margin. Carpus having 1 spine on distal end of flexor margin. Propodus and dactylus unarmed. Exopod overreaching distal end of merus (excluding distal spine).

    Pereopod 1 (Fig. 6A, B) slender, squamous, setose and

    spinose. Merus 4.8 times as long as broad, having irregular spines on flexor margin, extensor margin having 1 prominent spine. Carpus 2.3 times as long as broad, bearing row of irregular spines on mesial and lateral margins, mesial margin with well-developed spines, dorsal surface with some spines bearing short setae. Palm 1.6 times as long as broad, 0.6 times as long as movable finger, mesial and lateral margins having row of spines. Finger bearing row of spines; cutting edge having saw-shaped teeth.

    Pereopod 2 (Fig. 6C) slender. Ischium having 1 small spine on distoflexor margin. Merus 6.3 times as long as broad, extensor margin armed with row of spines, having plumose setae; flexor margin bearing row of spines on distal half, and spine sizes increasing distally. Carpus 2.5 times as long as broad, 5 spines on extensor margin. Propodus 3 times longer than dactylus, 8.7 times as long as broad, flexor margin armed with 9 movable spines including distal pair: 1 distolateral, 1 distomesial (distomesial spine not illustrated). Dactylus short, curving distally, having 6 movable spines on flexor margin. Pereopod 3 (Fig. 6D) with ischium having 1 small spine on distoflexor margin; merus 4.5 times as long as broad, having row of spines on extensor margin, flexor margin bearing row of spines on distal third; carpus 2.5 times as long as broad, bearing 5 spines on extensor margin; propodus 8.5 times as long as broad, flexor margin bearing 7 movable spines including distal pair: 1 distolateral, 1 distomesial (distomesial spine not illustrated); dactylus short, curving distally, having 5 movable spines on flexor margin. Pereopod 4 (Fig. 6E) with ischium unarmed; merus 3.9 times as long as broad, extensor margin having row of spines; carpus 2.3 times as long as broad, extensor margin bearing 4 low spines; propodus 8.1 times as long as broad, flexor margin bearing 7 movable spines including distal pair: 1 distolateral, 1 distomesial (distomesial spine not illustrated); dactylus short, curving distally, having 6 movable spines on flexor margin.

    Distribution. Indonesia, Japan and Korea.

    Remarks. Osawa (2005) described that the brachial margins of Raymunida lineata are moderately convex. However, the present specimen has subparallel branchial margins. Nevertheless, the present specimen agreed well with the type description in other diagnostic aspects.

    According to original description of Osawa (2005), Raymunida lineata is closely related to R. elegantissima (De Man, 1902) in antennal article 2 armed with one small spine on mesial margin, and maxilliped 3 with unarmed merus on extensor margin. However, the present species differs in the following points from R. elegantissima: thoracic sternites 5, 6 each having distinct oblique ridges on lateral parts, while in R. elegantissima, having faint, short ridges on lateral parts; antennal article 1 overreaching distal margin of antennal article 4, but in R. elegantissima, antennal article 1 reaching distal margin of antennal article 3.

    Key to the species of Korean munidids

    1. Carpus of maxilliped 3 unarmed on distal end of flexor margin ????????????????????????????????????????????????????????????????????? 2

    - Carpus of maxilliped 3 having one spine on distal end of flexor margin ??????????????????????????????????????????????????????????? 3

    2. Carapace with distinct transverse striae; rostrum overreaching end of eye ??????????????????????????????????? Munida japonica

    - Carapace with indistinct transverse striae; rostrum not reaching end of eye ??????????????????????? Paramunida scabra

    3. Antennal article 2 unarmed on mesial margin; antennal article 3 unarmed ????????????????????? Raymunida formosanus

    - Antennal article 2 having small spine on mesial margin; antennal article 3 bearing one small distomesial spine ????? ?????????????????????????????????????????????????????? Raymunida lineata

    Korean name: 1*바늘이마새우붙이과 (신칭)

    Korean name: 1*가시마디새우붙이속 (신칭), 2*가시마디새우붙이 (신칭)

    Korean name: 1*세로줄가시마디새우붙이 (신칭)

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  • [Fig. 1.] Raymunida formosanus Lin, Chan and Chu, 2004, male (CL 18.4 mm). Dorsal view. CL, carapace length from anterior border excluding rostrum to posterior border.
    Raymunida formosanus Lin, Chan and Chu, 2004, male (CL 18.4 mm). Dorsal view. CL, carapace length from anterior border
excluding rostrum to posterior border.
  • [Fig. 2.] Raymunida formosanus Lin, Chan and Chu, 2004, male (CL 18.4 mm). A, Carapace, anterior part of abdomen (setae omitted); B, Thoracic sternites; C, Anterior right part of cephalothorax, ventral view, showing antennular and antennal peduncles (setae omitted); D, Right maxilliped 3 (setae omitted). CL, carapace length from anterior border excluding rostrum to posterior border. Scale bars: A-D=5 mm.
    Raymunida formosanus Lin, Chan and Chu, 2004, male (CL 18.4 mm). A, Carapace, anterior part of abdomen (setae omitted);
B, Thoracic sternites; C, Anterior right part of cephalothorax, ventral view, showing antennular and antennal peduncles (setae
omitted); D, Right maxilliped 3 (setae omitted). CL, carapace length from anterior border excluding rostrum to posterior border.
Scale bars: A-D=5 mm.
  • [Fig. 3.] Raymunida formosanus Lin, Chan and Chu, 2004, male (CL 18.4 mm). A, Right pereopod 1, ischium, merus, and carpus (setae omitted); B, Same, chela (setae omitted); C, Right pereopod 2 (setae omitted); D, Right pereopod 3 (setae omitted); E, Right pereopod 4 (setae omitted). CL, carapace length from anterior border excluding rostrum to posterior border. Scale bars: A-E= 5 mm.
    Raymunida formosanus Lin, Chan and Chu, 2004, male (CL 18.4 mm). A, Right pereopod 1, ischium, merus, and carpus
(setae omitted); B, Same, chela (setae omitted); C, Right pereopod 2 (setae omitted); D, Right pereopod 3 (setae omitted); E,
Right pereopod 4 (setae omitted). CL, carapace length from anterior border excluding rostrum to posterior border. Scale bars: A-E=
5 mm.
  • [Fig. 4.] Raymunida lineata Osawa, 2005, male (CL 6.4 mm). Dorsal view. CL, carapace length from anterior border excluding rostrum to posterior border.
    Raymunida lineata Osawa, 2005, male (CL 6.4 mm). Dorsal view. CL, carapace length from anterior border excluding rostrum
to posterior border.
  • [Fig. 5.] Raymunida lineata Osawa, 2005, male (CL 6.4 mm). A, Carapace, anterior part of abdomen (setae omitted); B, Thoracic sternites; C, Anterior right part of cephalothorax, ventral view, showing antennular and antennal peduncles (setae omitted); D, Right maxilliped 3 (setae omitted). CL, carapace length from anterior border excluding rostrum to posterior border. Scale bars: A-D= 1 mm.
    Raymunida lineata Osawa, 2005, male (CL 6.4 mm). A, Carapace, anterior part of abdomen (setae omitted); B, Thoracic
sternites; C, Anterior right part of cephalothorax, ventral view, showing antennular and antennal peduncles (setae omitted); D,
Right maxilliped 3 (setae omitted). CL, carapace length from anterior border excluding rostrum to posterior border. Scale bars: A-D=
1 mm.
  • [Fig. 6.] Raymunida lineata Osawa, 2005, male (CL 6.4 mm). A, Left pereopod 1, ischium, merus, and carpus; B, Same, chela; C, Left pereopod 2; D, Left pereopod 3 (setae omitted); E, Right pereopod 4 (setae omitted). CL, carapace length from anterior border excluding rostrum to posterior border. Scale bars: A-E=1 mm.
    Raymunida lineata Osawa, 2005, male (CL 6.4 mm). A, Left pereopod 1, ischium, merus, and carpus; B, Same, chela; C,
Left pereopod 2; D, Left pereopod 3 (setae omitted); E, Right pereopod 4 (setae omitted). CL, carapace length from anterior border
excluding rostrum to posterior border. Scale bars: A-E=1 mm.