Anim. Syst. Evol. Divers. Vol. 35, No. 4: 168-181, October 2019 https://doi.org/10.5635/ASED.2019.35.4.034
Review article First Records of Two Cirolanid Species (Isopoda, Cymothooidea, Cirolanidae) from Korean Waters
Sung Hoon Kim1, Seong Myeong Yoon2,*
1Department of Life Sciences, College of Natural Sciences, Chosun University, Gwangju 61452, Korea 2Department of Biology, College of Natural Sciences, Chosun University, Gwangju 61452, Korea
ABSTRACT
Two cirolanid isopods, Eurydice longiantennata Nunomura and Ikehara, 1985 and Metacirolana japonica (Hansen, 1890), are newly reported based on the materials collected from the subtidal zone around Jeju Island. Eurydice longiantennata can be distinguishable from its congeners by the following features: body length is 5 mm; antennule is not extending beyond the cephalon; flagellum of the antenna is consisted of 31 flagellar articles; and pleotelson has eleven teeth and twelve setae distally. Metacirolana japonica is distinguished from its related species by the following characteristics: body is not ornament; pleonite 1 is entirely visible dorsally in male; pleotelson is gradually tapering distally; and uropodal rami have serrate margins. Keywords: Eurydice, Metacirolana, isopods, morphology, taxonomy, Korea
INTRODUCTION antennata Nunomura and Ikehara, 1985 and Metacirolana ja ponica (Hansen, 1890), which are new to Korean fauna were The family Cirolanidae Dana, 1852 is one of the largest groups collected. In this paper, we present the detailed illustrations and within the superfamily Cymothooidea Wägele, 1989 (see descriptions of these two species with the keys to known spe Bruce et al., 2017). Up to date, this family is composed of about cies of the genera Eurydice and Metacirolana in the Far East. 500 known species in 62 genera in the world (Boyko et al., 2008; Bruce et al., 2017). Most cirolanid isopods predomi nantly live in marine habitats ranging from intertidal to subtid MATERIALS AND METHODS al zone, but a few species are reported from freshwater (Bruce, 1986; Keable and Bruce, 1997; Hadfield et al., 2010; Paiva The materials of Eurydice longiantennata Nunomura and Ike and Souza-Filho, 2014; Rincón et al., 2014; Bruce et al., 2017; hara, 1985 and Metacirolana japonica (Hansen, 1890) were Sidabalok and Bruce, 2018). In spite of the cosmopolitan dis collected from the subtidal zone around Jeju Island in Korea tribution and the number of known species, only five cirolanid by Smith-McIntyre grab. The collected samples were imme isopods have been reported from Korea: Natatolana japon diately sorted using a sieve with the mesh size of 1 mm, and ensis (Richardson, 1904); Excirolana chiltoni (Richardson, then fixed in 95% ethyl alcohol. The specimens were observed 1905); Cirolana toyamaensis Nunomura, 1982; Cirolana ko and dissected under the stereomicroscope (SMZ 1500; Nikon, reana Kwon, 1988; and Metacirolana shijikiensis Nunomura, Japan) and bright-field microscope (BX 50; Olympus, Japan). 2008 (see Kim and Kwon, 1988; Kwon, 1988; Song and Min, Measurements and drawing of the specimens were con 2016). Furthermore, all the five species were collected from the ducted with the aid of a drawing tube. The drawings were intertidal zone or the shallow water near the shoreline in Ko scanned, inked digitally and arranged to plates using the rea. Thus, the subtidal survey of this family has been required. methods described by Coleman (2003, 2009). The examined In this situation, we carried out the investigation of the sub materials in this study were deposited at the National Insti tidal zone around Jeju Island in Korea during January 2018 to tute of Biological Resource (NIBR) and Chosun University April 2019. As a result, two cirolanid isopods, Eurydice longi in Korea.
This is an Open Access article distributed under the terms of the Creative *To whom correspondence should be addressed Commons Attribution Non-Commercial License (http://creativecommons.org/ Tel: 82-62-230-7018, Fax: 82-62-230-7018 licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, E-mail: [email protected] and reproduction in any medium, provided the original work is properly cited. eISSN 2234-8190 Copyright The Korean Society of Systematic Zoology Two Cirolanid Species from Korea
A B
Fig. 1. Eurydice longiantenata, male. A, Habitus, dorsal view; B, Habitus, lateral view. Scale bar: A,B=2 mm.
SYSTEMATIC ACCOUNTS posteriorly; clypeus broadly triangular, acute distally, project ing ventrally. Coxae 2-5 with round angle, 6-7 with acute 1*Order Isopoda Latreille, 1817 angle at posterolateral corners. Pereonites similar to each 2*Superfamily Cymothooidea Leach, 1814 other in shape; pereonite 1 narrowing anteriorly; pereonites 3*Family Cirolanidae Menzies and Glynn, 1968 5 and 6 longest in length. Pleonites subequal in length; pos 4*Genus Eurydice Leach, 1815 terior dorsal margin convex centrally; posterolateral margin of pleonites 2-4 acute; pleonite 1 concealed by pereonite 7; 5*Eurydice longiantennata Nunomura and Ikehara, pleonite 5 sinuous on posterior margin. Pleotelson 1.5 times 1985 (Figs. 1-5) as long as greatest width; lateral margins convex, narrowing Eurydice longiantennata Nunomura and Ikehara, 1985: 52, posteriorly; truncated posterior margin with 11 teeth and 12 figs. 1, 2. plumose setae (Figs. 1A, B, 2A-D). Antennule slightly over posterior margin of cephalon, with Material examined. Korea: 2♂♂, 7♀♀, Jeju-do, Seogwi geniculated peduncular article between articles 1 and 2, com po-si, Daejeong-eup, Mara Island, 33°11ʹ15ʺN, 126°18ʹ12ʺE, posed of 3 peduncular and 5 flagellar articles; peduncular ar depth 33 m, cat no. NIBRIV0000860026; 1♂, 33°12ʹ58ʺN, ticle 1 slightly longer than combined length of articles 2 and 126°19ʹ28ʺE, depth 30 m; 1♂, 2♀♀, 33°09ʹ56ʺN, 126°14ʹ 3; article 2 with 4 penicillate setae laterally; article 3 with 1 50ʺE, depth 35 m, on 28 Apr 2018, using Smith-McIntyre penicillate seta and 4 simple setae distally; flagellar article 1 grab. 4.8 times longer than flagellar article 2, with numerous aes Description of male. Body 5 mm in length, 3 times longer thetascs along with lateral margin and 1 simple seta on distal than greatest width, elongated; lateral margins subparallel; end; article 2 with 2 aesthetascs and 2 simple setae on distal dorsal surface smooth. Cephalon semicircular on anterior mar end; article 3 1.1 times longer than flagellar article 2, with 2 gin, with minute rostral process; eyes well developed, large, aesthetascs and 5 simple setae distally; article 4 0.3 times lon observed dorsoventrally; frontal lamina lanceolate, narrowing ger than flagellar article 3, with 1 aesthetascs on distal end;
Korean name: 1*등각목, 2*부채벌레상과, 3*모래무지벌레과, 4*꺾인더듬이모래무지벌레속 (신칭), 5*긴꺾인더듬이모래무지벌레 (신칭)
Anim. Syst. Evol. Divers. 35(4), 168-181 169 Sung Hoon Kim, Seong Myeong Yoon
A B
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Fig. 2. Eurydice longiantenata, male. A, Habitus, dorsal view; B, Habitus, lateral view; C, Cephalon, ventral view; D, Pleotelson; E, An- tennule; F, Antenna; G, Proximal region of antenna; H, Distal end of antenna; I, Penes. Scale bars: A, B=1 mm, C, D=0.5 mm, E-I= 0.2 mm.
170 Anim. Syst. Evol. Divers. 35(4), 168-181 Two Cirolanid Species from Korea
A B
C D E
Fig. 3. Eurydice longiantenata, male. A, Right mandible; B, Left mandible; C, Maxillule, D, Maxilla; E, Maxilliped. Scale bars: A-E=0.5 mm. article 5 similar to article 4 in length, with 2 simple setae dis seta and 1 short simple seta (Fig. 2F-H). tally (Fig. 2E). Right mandible, spine row with 7 spines; molar process Antenna extending to mid-length of pleotelson, consisted with 20 marginal spines; incisor with 3 rounded cusps; palp of 4 peduncular and 31 flagellar articles; peduncular article 1 consisted of 3 articles, article 1 0.6 times longer than article almost square, with 1 simple seta distally; article 2 subequal 2, article 2 with 2 simple setae laterally and 5 simple setae to article 1 in length, with 2 simple setae distally; article 3 distally, article 3 0.4 times longer than article 2, with 9 simple similar to combined length of articles 2 and 3, with 1 peni setae on distal end. Left mandible, spine row with 6 spines; cillate seta on lateral margin, 6 pairs of simple setae on an molar process with 17 marginal spines; incisor with 3 round terodistal end; article 4 1.9 times longer than article 3, with ed cusps; palp composed of 3 articles, article 1 0.6 times lon 2 penicillate and 5 simple setae laterally; 31 flagellar articles ger than article 2, article 2 with 1 simple seta laterally and 4 slightly longer in length and narrower in width, each articles simple setae distally, article 3 shorter than article 1, with 11 with several short simple setae, last article with 1 long simple simple setae distally (Fig. 3A, B).
Anim. Syst. Evol. Divers. 35(4), 168-181 171 Sung Hoon Kim, Seong Myeong Yoon
Maxillule, inner lobe with 3 plumose setae on distal end; margin; exopod articulated, with numerous plumose setae on outer lobe with 6 simple and 4 denticulate setae distally (Fig. outer margin and distal region; endopod naked, with concave 3C). apex. Appendix masculine longer than endopod, inserted me Maxilla, composed of 3 lobes; inner lobe with 3 simple se dially, broadest on distal region, with short projections later tae distally and 3 plumose setae laterally; 2 mesial lobes with ally; apex with subacute projection (Fig. 5A-F). 2 simple setae laterally; outer lobe with 3 denticulate setae Uropod, protopod with 1 plumose seta on inner margin, 9 distally (Fig. 3D). plumose setae and 1 robust seta on outer margin; rami with Maxilliped, endite with 3 plumose setae distally; palp com almost straight lateral margin; endopod 1.3 times longer than posed of 5 articles, curved between articles 1 and 2; articles exopod, with numerous plumose, 2 serrate, and 2 simple setae subequal to each other in length; article 1 with 1 simple seta distally; exopod shorter than endopod, with 1 serrate seta, nu on subdistal end; article 2 with 1 simple seta; articles 3 and 4 merous plumose, 2 robust, 4 simple setae distally (Fig. 5G-I). with 5 simple setae on inner margin and several fine setae on Penes separated, with rounded apex (Fig. 2I). outer margin; article 5 with 7 simple setae on distal end and Description of female. Female similar to male except for several fine setae on outer margin (Fig. 3E). sexual characters, body shape, and length of antenna. Body Pereopods sequentially longer in length, geniculate be more ovoid laterally than male; lateral margins slightly con tween basis and ischium. Pereopods 1-3 similar to each oth vex. Antenna shorter than male. er; basis with 0-1 penicillate seta and several short simple Distribution. Korea (present study), Japan. setae laterally, numerous simple setae on posterodistal angle; Remarks. Eurydice longiantennata was originally described ischium shorter than basis, with several simple setae on pos from Japan by Nunomura and Ikehara (1985). It can be dis terior margin and anterodistal angle, 1 or 3 robust setae on tinguished from other species of Eurydice by the following posterodistal angle; merus shorter than ischium, with several features: body is 5 mm in length and 3.1 times longer than simple setae on anterodistal angle, robust and simple setae the greatest width; truncated posterior margin of the pleotel along with posterior margin; carpus square in pereopod 1, son has 11 teeth and 11 plumose setae; antennule does not triangular in pereopods 2 and 3, with several robust and sim extend beyond the cephalon; antenna has 31 flagellar articles ple setae on posterior margin, 1 denticulate robust seta on (Nunomura and Ikehara, 1985). The Korean materials of this posterodistal angle, 1 or 2 short simple setae on mesial mar study are well corresponded with the original description gin; propodus oblong, with numerous simple setae on lateral (Nunomura and Ikehara, 1985) in terms of all characteristics margin, several robust and denticulate setae along with prop mentioned above. odal palm; dactylus with 1-3 simple setae and claw on distal Among Eurydice species, E. saikaiensis Nunomura, 2008 end. Pereopods 4-7 resemble to each other, much bristle on and E. nunomurai Saito, 2012 closely resemble E. longi pereopod 7; basis with 2-4 penicillate setae and several sim antennata in terms of the length of the antenna, the truncated ple setae on anterior margin, numerous simple setae on pos posterior margin of the pleotelson, and the location of the terodistal angle; ischium to carpus consequentially shorter in type locality (Nunonura, 2008; Saito, 2012). Eurydice longi length, with numerous robust setae on anterodistal angle and antennata is similar to E. saikaiensis by having the antennule posterior margin, numerous simple setae on anterior and pos extending to the posterior margin of the cephalon and the terior margin; propodus slender, oblong, with several simple truncated posterior margin of the pleotelson. However, the setae on anterior margin and several robust setae on propodal former is different from the latter in terms of the number of palm; dactylus with simple setae and claw on distal end (Fig. the antennal flagellar articles (31 in the former vs. 39-40 in 4A-G). the latter) and the numbers of the teeth and setae on the poste Pleopods similar to each other in shape, sequentially larg rior margin of the pleotelson (11 teeth and 12 setae in the for er from pleopod 1 to pleopod 5; protopod square to oblong. mer vs. 5-6 teeth and 8 setae in the latter) (Nunomura, 2008). Pleopods 1 and 2, protopod with 1 plumose seta and 3 or 6 Eurydice longiantennata is close to E. nunomurai in having coupling hooks on inner margin, 0 or 1 simple seta on outer 31 antennal flagellar articles and the truncated posterior mar margin; rami subequal in length, elongated oblong; apex of gin of the pleotelson. However, the former is readily distin rami rounded, with numerous plumose setae distally. Pleo guished from the latter in the following features: the body pods 3 and 4, protopod with 1 plumose seta and 3 coupling length (5 mm in the former vs. 6.68 mm in the latter), the hooks on inner margin, 0 or 1 simple seta on outer margin; length of the antennule (not extending beyond the cephalon in rami elongated ovoid, exopod slightly longer than endopod, the former vs. extending beyond pereonite 1 in the latter), and exopod articulated, with numerous plumose setae on outer the numbers of the teeth and setae on the posterior margin of and distal region, endopod with numerous plumose setae on the pleotelson (11 teeth and 12 setae in the former vs. 13 teeth distal end. Pleopod 5, protopod with 1 simple seta on outer and 13 setae in the latter) (Saito, 2012).
172 Anim. Syst. Evol. Divers. 35(4), 168-181 Two Cirolanid Species from Korea
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B
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Fig. 4. Eurydice longiantenata, male. A, Pereopod 1; B, Pereopod 2; C, Pereopod 3; D, Pereopod 4; E, Pereopod 5; F, Pereopod 6; G, Pereopod 7. Scale bar: A-G=0.5 mm.
Anim. Syst. Evol. Divers. 35(4), 168-181 173 Sung Hoon Kim, Seong Myeong Yoon
C
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Fig. 5. Eurydice longiantenata, male. A, Pleopod 1; B, Pleopod 2; C, Apendix mansculina; D, Pleopod 3; E, Pleopod 4; F, Pleopod 5; G, Uropod; H, Distal region of uropodal endopod; I, Distal region of uropodal exopod. Scale bars: A, B, D-G=0.5 mm, C, H, I=0.1 mm.
Key to known Eurydice species in the Far East with more than 6 setae······················································· 3 1. Antenule not extending to posterior margin of cephalon···· 3. Antennule extending to posterior marign of pereonite 1···· ····································E. nipponica Bruce and Jones, 1981 ····················································E. nunomurai Saito, 2012 - Antenule extending to posterior margin of cephalon or - Antennule extending to posterior marging of cephalon····· pereonite 1········································································· 2 ··························································································· 4 2. Antenna with 10 flagellar articles; pleotelson with 6 setae· 4. Posterior margin of pleotelson with 5-6 teeth and 8 setae· ··············································E. akiyamai Nunomura, 1981 ·········································· E. saikaiensis Nunomura, 2008 - Antenna with more than 10 flagellar articles; pleotelson - Posterior margin of pleotelson with 11 teeth and 11-12
174 Anim. Syst. Evol. Divers. 35(4), 168-181 Two Cirolanid Species from Korea
A B
Fig. 6. Metacirolana japonica. A, Habitus, male; B, Habitus, female. Scale bar: A, B=1 mm.
setae·········E. longiantennata Nunomura and Ikehara, 1985 onites (Fig. 7A, B) similar to each other in shape; pereonite 1 longer than others in length, with narrowing anteriorly. Pleon 1*Genus Metacirolana Kussakin, 1979 (Fig. 7A, B, F) almost half length of body; pleonites subequal in length, posterior margin of pleonites 1-4 concave while 2*Metacirolana japonica (Hansen, 1890) (Figs. 6-10). posterior margin of pleonite 5 convex mesially; pleotelson tri Cirolana japonica Hansen, 1890: 349, Pl. 4, fig. -2 2I; Tat angular, narrowing posteriorly, posterior margin serrated and tersall, 1921: 208, Pl. 2, figs. 11-16. with plumose setae. Metacirolana japonica Kussakin, 1979: 213, fig. 89; Bruce, Antennule (Figs. 7A, 8A) reaching posterior margin of 1981: 947, figs. 1c, f; 2c, f; 3c, d; 4b; 5e, f; 1986: 35, figs. pereonite 1, consisted of 3 peduncular and 9 flagellar articles; 20, 21. peduncular article 1 rectangular to square, with 1 simple seta and 3 penicillate setae; article 2 1.7 times longer than article Material examined. Korea: 3♂♂, 2♀♀, Jeju-do, Seogwi 1, oblong, with 2 simple setae laterally and 1 penicillate seta po-si, Daejeong-eup, 33°09ʹ12ʺN, 126°18ʹ00ʺE, 28 Apr 2018, distally; article 3 0.5 times longer than article 2, with 1 simple depth 102 m, cat no. NIBRIV0000860027; 1♂, same location seta laterally and 1 penicillate seta distally; flagellar articles as previous, 17 Jul 2018, depth 100 m using Smith-McIntyre with several aesthetascs laterally and simple setae distally; grab. article 1 square, with 4 penicillate setae; articles 2-8 slender, Description of male. Body (Figs. 6A, 7A, B) 3.9 mm in rectangular; article 9 minute, with 4 simple setae distally. length, 3 times longer than greatest width, dorsoventrally flat Antenna (Figs. 7A, B, 8B) extending to pereonite 7, com tened; lateral margins parallel; dorsal side smooth. Cephalon posed of 4 peduncular and 16 flagellar articles; peduncular (Fig. 7A, B, D, E) semicircular anteriorly, with rostral process article 1 globular to square, article 2 square to oblong, with mesially; eyes large, with ommatidia, observed dorsoventral 1 simple seta distally, article 3 rectangular, 3 times longer ly; frontal lamina narrowing posteriorly, with rounded apex; than article 2, with 1 simple seta distally; article 4 oblong, 1.5 clypeus acute distally, projecting ventrally. Coxae (Fig. 7A, B), times longer than article 3, with 1 simple seta and 3 penicil 5-7 visible, whereas 2-4 barely visible on dorsal side. Pere late setae; flagellar articles rectangular, with -2 4 simple setae
Korean name: 1*톱니꼬리모래무지벌레속, 2*긴허리톱니꼬리모래무지벌레 (신칭)
Anim. Syst. Evol. Divers. 35(4), 168-181 175 Sung Hoon Kim, Seong Myeong Yoon
A B C
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Fig. 7. Metacirolana japonica, male. A, Habitus, dorsal view; B, Habitus, lateral view; D, Cephalon, anterodosal view; E, Cephalon, ventral view; F, Pleotelson; G, Penes. Female: C, Habitus, dorsal view. Scale bars: A-C=1 mm, D-G=0.2 mm.
176 Anim. Syst. Evol. Divers. 35(4), 168-181 Two Cirolanid Species from Korea
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Fig. 8. Metacirolana japonica, male. A, Antennule; B, Antenna; C, Right mandible; D, Left mandible; E, Maxillule, F, Maxilla; G, Maxil- liped. Scale bars: A-G=0.1 mm.
Anim. Syst. Evol. Divers. 35(4), 168-181 177 Sung Hoon Kim, Seong Myeong Yoon
B
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Fig. 9. Metacirolana japonica, male. A, Pereopod 1; B, Pereopod 2; C, Pereopod 3; D, Pereopod 4; E, Pereopod 5; F, Pereopod 6; G, Pereopod 7. Scale bar: A-G=0.5 mm.
178 Anim. Syst. Evol. Divers. 35(4), 168-181 Two Cirolanid Species from Korea
A B C
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Fig. 10. Metacirolana japonica, male. A, Pleopod 1; B, Pleopod 2; C, Pleopod 3; D, Pleopod 4; E, Pleopod 5; F, Uropod. Scale bar: A- F=0.5 mm. distally. 2 longer than other articles, with 8 simple and 2 denticulate Mandibles (Fig. 8C, D) asymmetric. Right mandible (Fig. setae on lateral margin, 2 simple setae on mid-distal end; arti 8C), spine row with 8 spines; molar process with 12 marginal cle 3 with 8 simple and 3 serrate setae on lateral margin. spines; incisor with 4 cusps; palp composed of 3 articles; ar Maxillule (Fig. 8E) composed of 2 lobes; inner lobe with ticle 1 0.4 times longer than article 2; article 2 with 10 simple 3 serrate setae on distal end; outer lobe with 8 simple and 2 and 2 denticulate setae along with lateral margin, 1 simple denticulate setae. seta on mid-distal end; article 3 0.4 times longer than article 2, Maxilla (Fig. 8F) consisted of 3 lobes; inner lobe with 6 with 5 simple and 5 denticulate setae along with lateral mar simple setae and 1 plumose seta distally; mesial and outer gin. Left mandible (Fig. 8D), spine row with 7 spines; molar lobes with 3 simple setae on distal end. process with 15 marginal spines; incisor with 3 cusps; palp Maxilliped (Fig. 8G), endite reaching to distal end of palp composed of 3 articles; article 1 subequal to article 3; article article 2, with 1 simple and 1 plumose seta distally, 1 cou
Anim. Syst. Evol. Divers. 35(4), 168-181 179 Sung Hoon Kim, Seong Myeong Yoon pling hook laterally; palp 5-segmented; article 1 with 1 simple uropodal rami having a serrate margin (Hansen, 1890; Tat seta on inner distal end; article 2 with 1 simple seta on outer tersall, 1921; Kussakin, 1979; Bruce, 1986). Presently, three margin distally and 3 simple setae on inner margin; article 3 Metacirolana species, Metacirolana japonica (Hansen, 1890); widest and longest, with 2 simple setae on outer margin and Metacirolana costata Nunomura, 1999; and Metacirolana 5 simple setae on inner margin; article 4 with 5 simple setae shijikiensis Nunomura, 2008, have been known in the Far distally; article 5 with 8 simple setae distally. East (Sidabalok and Bruce, 2018). Among them, M. japonica Pereopods (Fig. 9A-G) consecutively longer in length. is most similar with M. shijikiensis in terms of the smooth Pereopods 1-3 (Fig. 9A-C) short, similar to each other; basis body without any ornamentations and the pleotelson and uro with 1 simple seta on posterodistal angle and 1-3 penicillate pods having a serrate margin, but the former differs from the setae; ischium about 0.3 times longer than basis, with 1 sim latter in terms of the longer pleonites (Nunomura, 2008; Song ple seta on anterodistal angle, 0 or 2 simple setae on posterior and Min, 2016). Metacirolana japonica also resembles Meta margin; merus with several stout setae on posterodistal mar cirolana hanseni (Bonnier, 1896) by having the smooth body gin; merus of pereopods 2 and 3 with produced anterodistal without any ornamentations, smoothly tapering pleotelson angle, with 1 stout seta and 1 or 2 simple setae while pereo without stout spine-like setae, and uropodal rami having ser pod 1 not above mentioned; carpus smaller than other arti rate margins, but the former differs from the latter by having cles, with 1 stout seta and several simple setae on anterodistal acute distal end of the uropodal endopods (vs. bi-furcate distal angle; propodus slightly longer than ischium, with 1-2 simple end in the latter) (Kussakin, 1979). setae on anterodistal end, several simple and stout setae on palm, 1 denticulate stout seta on posterodistal end; dactylus Key to known Metacirolana species in the Far East with several simple setae and claw on distal end. Pereopods 1. Pleotelson with medial ridge dorsally; apex of pleotelson - - 4 7 (Fig. 9D G) slender, subequal to each other; basis with and uropods rounded·············· M. costata Nunomura, 1999 penicillate setae on anterior margin, 1 or 2 simple setae on - Pleotelson without medial ridge dorsally; apex of pleotel posterodistal end; ischium to carpus sequentially shorter in son and uropods subacute·················································· 2 length, with stout setae on anterodistal end and posterior mar 2. Pleonite 1 partly hidden by pereonite 7 in male················· - gin; carpus of pereopods 6 7 with 1 or 3 penicillate setae an ·········································M. shijikiensis Nunomura, 2008 terodistally; propodus similar to carpus in length, with stout - Pleonite 1 entirely visibles in male···································· setae along with palm, penicillate and simple setae on antero ·················································M. japonica (Hansen, 1890) distal end; dactylus shorter than merus, with simple setae and claw distally. Pleopods (Fig. 10A-E) undifferentiated in shape; protopod ORCID oblong, with 1 simple seta on outer margin, 1-2 plumose se tae and 3-4 coupling hooks whereas protopod of pleopod 5 Sung Hoon Kim: https://orcid.org/0000-0001-7271-7308 not above; rami lanceolate, similar in length, with numerous Seong Myeong Yoon: https://orcid.org/0000-0002-3246-3021 plumose setae while endopod of pleopod 5 without plumose setae; exopod wider than endopod; exopod of pleopods 3-5 with partial suture line; appendix masculine similar to rami of pleopod 2 in length, inserted proximally, with tapering apex. CONFLICTS OF INTEREST Uropod (Fig. 10F) not exceeding distal end of pleotel son; protopod produced on inner distal end; rami oval, with Seong Myeong Yoon, a contributing editor of the Anmal Sys plumose setae between sinuate margin and acute apex; endo tematics, Evolution and Diversity, was not involved in the pod wider than exopod. editorial evaluation or decision to publish this article. Another Penes (Fig. 7G) separated, about 4 times longer than wide; author has declared no conflicts of interest. apex round. Description of female. Body more ovoid than male. Pleon shorter than male. ACKNOWLEDGMENTS Distribution. Korea (present study), Austraila, Japan, Peru. Remarks. Korean materials of Metacirolana japonica (Han This study was supported by the research funds from Chosun sen, 1890) are well accorded with the previous reports of the University (2018) and the National Institute of Biological species in terms of the smooth body without ornament, mod Resources (NIBR), funded by the Ministry of Environment erately narrow pleotelson, smoothly tapering distal end of the (MOE) of the Republic of Korea (NIBR 201902204). pleotelson, acute distal end of the uropodal endopods, and
180 Anim. Syst. Evol. Divers. 35(4), 168-181 Two Cirolanid Species from Korea
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