Three xanthid crabs,
Liomera margaritata, Neoxanthops lineatus
and
Pilodius miersi
, are described and illustrated for the first time in Korea.
Liomera margaritata
and
N. lineatus
are the first species of their genera to be found in Korea. The three species represent extensions of their previously known ranges and bring the number of known species of the xanthid crabs to 25 from Korean waters.
INTRODUCTION
The family Xanthidae is one of the largest families in the Brachyura and includes 628 species of 117 genera of 13 subfamilies (Ng et al., 2008). Currently, 22 species [
Actaea ployacantha
(Heller, 1861),
Actaea semblatae
Guinot, 1976,
Actaeodes hirsutissimus
(Rüppell, 1830),
Atergatis floridus
(Linnaeus, 1767),
Atergatis reticulates
(De Haan, 1835),
Atergatopsis germaini
A. Milne Edwards, 1865,
Banareia subglobosa
(Stimpson, 1858),
Calvactaea tumida
Ward, 1933,
Cycloxanthops truncatus
(De Haan, 1837),
Forestia depressa
(White, 1848),
Gaillardiellus orientalis
(Odhner, 1925),
Leptodius exaratus
(H. Milne Edwards, 1834),
Lybia caestifera
(Alcock, 1898),
Macromedaeus distinguendus
(De Haan, 1835),
Microcassiope orientalis
Takeda and Miyake, 1969,
Medaeops granulosus
(Haswell, 1882),
Nanocassiope granulipes
(Rathbun, 1939),
Neoliomera insularis
(Adams and White, 1849),
Novactaea pulchella
(A. Milne Edwards, 1865),
Palapedia integra
(De Haan, 1835),
Pilodius nigrocrinitus
Stimpson, 1859, and Platypodia tomentosa (De Man, 1902)] belonging to 20 genera of nine subfamilies (Actaeinae, Chlorodiellinae, Euxanthinae, Kraussiinae, Liomerinae, Polydectinae,Xanthinae, Zalasiinae and Zosiminae) have been recorded from Korean waters (Lee et al., 2010).
Liomera margaritata
(A. Milne Edwards, 1873),
Neoxanthops lineatus
(A. Milne Edwards, 1867), and
Pilodius miersi
(Ward, 1936) were collected in approximately 25 m depth by SCUBA diving off Hyeongjeseom Island (Mosulpo, Jejudo Island). The genera,
Liomera
Dana, 1851 and
Neoxanthops
Guinot, 1968, are reported for the first time in Korea. Now Korean Xanthid crabs consist of 25 species belonging to 22 genera.
Drawings were made with the aid of camera lucida. The abbreviations “cl” and “cw” refer to carapace length from the tip of frontal margin to the posterior dorsal margin of the carapace and to the width of the carapace measured at the widest part, respectively. All specimens were preserved in 95% ethanol. The classification follows that of Ng et al. (2008) and terminology used for carapace regions generally follows
Liomera margaritata male (cl 13.7 mm cw 23.7 mm). cl carapace length from the tip of frontal margin to the posterior dorsal margin of the carapace; cw the width of the carapace measured at the widest part.
Liomera margaritata male (cl 13.7 mm cw 23.7 mm). A Dorsal view of carapace; B Third maxilliped; C Left cheliped; DRight cheliped; E F Third to fourth ambulatory legs; G Abdomen; H H′ Gonopod. Scale bars: A-H=1 mm H′=0.1 mm. cl carapace length from the tip of frontal margin to the posterior dorsal margin of the carapace; cw the width of the carapace measured at the widest part.
those of Serène (1984). All specimens are deposited at the corresponding author’s collection of Silla University, Busan.
SYSTEMATIC ACCOUNTS
Order Decapoda Latreille, 1802
Superfamily Xanthoidea MacLeay, 1838
Family Xanthidae MacLeay, 1838
Subfamily Liomerinae Sakai, 1976
1*
Genus
Liomera
Dana, 1851
2*
Liomera margaritata (A. Milne Edwards, 1873) (Figs. 1, 2)
Carpilodes margaritatus
A. Milne Edwards, 1873: 182, Pl.5,
fig. 2
.
Liomera margaritata
: Sakai, 1965: 144, Pl. 72, fig. 3; Guinot, 1967: 266; Serène, 1968: 72; Sakai, 1976: 396, fig. 211; Dai and Yang, 1991: 271, Pl. 34(2), fig. 145(2).
Liomera (Liomera) margaritiata
: Serène, 1984: 63, Pl. 7A, fig. 23.
Materials examined.
1♂ (cl 13.7 mm, cw 23.7 mm), Hyeongjeseom Island, 16 Jun 2009, Ko HS, SCUBA at 25 m depth.
Description.
Carapace (
Figs. 1
,
2
A) transversely ovoid, about 1.7 times broader than long, dorsal surface covered with rounded granules except on smooth inter-regional furrows; regions well distinct, separated by strong furrows. 1F and 2F confluent, not separated from frontal margin; 1M and 2M fused but 2M divided longitudinally into 2 parts; 1L to 5L distinct clearly but 2L and 3L fused. 1R and 2R fused; 3R not defined. Anterolateral margins divided into 4 rounded lobes by shallow sinus, margins granulated. Posterolateral margins oblique, somewhat straight. Frontal margin slightly projecting, divided into 2 lobes by narrow fissure.
Third maxilliped (
Fig. 2
B) punctuated on surface; ischium subrectangular, about 1.4 times longer than broad; longitudinal groove on medially; inner margin granulated and with setae. Antero-external angle of merus produced. Distal half of inner margin of expod granulated.
Chelipeds (
Fig. 2
C, D) subsymmetrical, slightly short; surfaces of meri, carpi and palm covered with rounded granules except on distomedial surface of palm naked; fingers bluntly pointed, curved, dark brown colored, cutting margins with triangular teeth.
Third and fourth ambulatory legs (
Fig. 2
E, F) flattened,covered with triangular granules; meri with setae on anterior margins; carpi with setae on distal margins; propodi with long setae on distal half of posterior margins; dactyli with long setae on distal half of margins; tips pointed, curved, dark brown colored.
Male abdomen (
Fig. 2
G) relatively narrow; segments 3 to 5 fused; segment 6 longer than broad. Telson coniform.
First gonopod (
Fig. 2
H, H′) relatively long, slender, recurved, with truncated tip; spinules and long setae on distal margin.
Color of in life.
Carapace and legs reddish violet, fingers of chelipeds and dactyli of ambulatoy legs dark brown.
Habitat.
Crevices of coral reef or under stones.
Distribution.
Red Sea, Aden, Madagascar, China, Japan, Indonesia, New Guinea, New Caledonia, Samoa (Sakai, 2004) and now to Korea.
Remarks.
Thirty-three species of
Liomera
have been reported world-wide (Ng et al., 2008).
Liomera margaritata
is distinguished from other species by having fused 1M and 2M, longitudinally divided 2M, and fused 2L and 3L (Serène, 1984).On this respect our specimen agrees well with Serène’s description(1984). However, it is slightly different from the latter in the carapace, which has 5L incompletely divided into 1R+2R in his description, but, 5L is completely divided into 1R+2R in our specimen.
Subfamily Xanthinae MacLeay, 1838
3*
Genus
Neoxanthops
Guinot, 1968
4*
Neoxanthops lineatus (A. Milne Edwards, 1867) (Figs. 3, 4)
Cycloxanthus lineatus
A. Milne Edwards, 1867: 269.
Cycloxanthops lineatus
: Rathbun, 1910: 350, Pl. 2, fig. 15;
Neoxanthops lineatus female (cl 12.2 mm cw 18.7 mm). cl carapace length from the tip of frontal margin to the posterior dorsal margin of the carapace; cw the width of the carapace measured at the widest part.
Neoxanthops lineatus female (cl 12.2 mm cw 18.7 mm). A Dorsal view of carapace; B Third maxilliped; C Dorsal view of left cheliped; D Ventral view of left cheliped; E-H First to fourth ambulatory legs; I Abdomen. Scale bars: A-I=1 mm. cl carapace length from the tip of frontal margin to the posterior dorsal margin of the carapace; cw the width of the carapace measured at the widest part.
Terada, 1982: 169.
Neoxanthops lineatus
: Guinot, 1968: 700, fig. 16; Sakai, 1976: 436, Pl. 157, fig. 1; Takeda, 1978: 40; Serène, 1984: 211 (key), 212, Pl. 29C, fig. 127; Minemizu, 2000: 263.
Materials examined.
1♀ (cl 12.2 mm, cw 18.7 mm), Hyeongjeseom Island, 16 Jun 2009, Ko HS, SCUBA at 25 m depth.
Description.
Carapace (
Figs. 3
,
4
A) naked, fan-shaped,about 1.5 times broader than long; regions not defined; surface convex medially. Anterolateral margins arched prolonged far backward, sharply crested, divided into 4 lobes by 3 narrow fissures. Posterolateral margins slightly concaved.Frontal margin well produced, directed downward; divided into 2 lobes by longitudinal fissure.
Third maxilliped (
Fig. 4
B). Ischium subrectangular, about 1.4 times longer than broad; bearing setae on inner margin; antero-external angle of merus produced.
Left cheliped (
Fig. 4
C, D) relatively long, robust; anterior margin of carpus crenulated; palm long, slender, proximal and anterior margins crenulated; fingers slender, curved,brown colored; cutting margin of fixed finger with 2 triangular teeth.
Ambulatory legs (
Fig. 4
E-H) naked, generally short, stout, flattened; fourth ambulatory legs shorter than others; dactyli long, tips bluntly pointed, brown colored.
Female abdomen (
Fig. 4
I) elongated, 6-segmented. Telson semicircular, broader than long.
Color of in life.
Red diagonal lines distributed on lateral each half on carapace, fingers of chelipeds and proximal parts of propodi and dactyli of ambulatory legs are dark brown.
Habitat
. Crevices of coral reef and under stones.
Distribution.
Red Sea, Aden, Kenya, Zanzibar, Madagascar, Japan, Taiwan, Australia, New Caledonia (Sakai, 2004) and now to Korea.
Remarks.
The genus
Neoxanthops
was separated from the genus
Cycloxanthops
Rathbun, 1897 (Guinot, 1968). At present, three species [
N. lineatus
(A. Milne-Edwards, 1867),
N. guadrilobatus
(Sakai, 1939) and
N. rotundus
Guinot, 1968] of this genus have been recorded world-wide (Sakai, 2004).
Neoxanthops lineatus
is distinguished from other species by having a depressed carapace with undefined regions and outer margins of the ambulatory legs without crest (Sakai, 1976). This species seems to be similar to
C. truncatus
in Korea, however, it is easily distinguished from
C. truncatus
by having red diagonal lines distributed on lateral each half and the margin of carapace extremely arched anterolaterally.
Subfamily Chlorodiinae Ng and Holthuis, 2007
Genus
Pilodius
Dana, 1851
1*
Pilodius miersi (Ward, 1936) (Figs. 5, 6)
Chlorodopsis miersi
Ward, 1936: 4, Pl. 2, figs. 1-3.
Pilodius granulatus
(not Stimpson, 1859): Sakai, 1976: 460, Pl. 164, fig. 3; Serène, 1984: 239 (key); Dai and Yang, 1991: 329, Pl. 43(3), fig. 165B.
Pilodius miersi
: Clark and Galil, 1993: 1136, figs. 7A-G, 34A, 41.
Materials examined.
1♂ (cl 7.5 mm, cw 13 mm), Hyeongjeseom Island, 16 Jun 2009, Ko HS, SCUBA at 25 m depth.
Description.
Carapace (
Figs. 5
,
6
A) convex, transversely ovoid, about 1.7 times broader than long; regions well defined, elevated, separated by strong furrows, covered with irregularly granules and setae.
1
F and
2
F fused. 1M produced, with 3 spines anteriorly. 2M divided into longitudinally. 3M tripartite, anterior lobe surpassing anterior margin of 2M. 1L to 5L distinct clearly. 1P and 2P distinct clearly, 2P disjuncted medially. Anterolateral margins divided into 4 spines,tuberculated; apical spine directed anteriorly, yellowish brown colored. Posterolateral margins oblique, somewhat straight. Frontal margin arched, granulated; divided into 2 lobes by U-shape notch.
Third maxilliped (
Fig. 6
B) punctuated on surface. Ischium subrectangular, about 1.5 times longer than broad, inner margin granulated and with setae, longitudinal groove on medially;antero-inner margin with small spines; merus with setae on inner margin; antero-external angle produced, with small spines; dactylus setose, with spines medially
Chelipeds (
Fig. 6
C, D) asymmetrical, relatively long, robust, covered with granules and setae; palms long, slender, conical
Pilodius miersi male (cl 7.5 mm cw 13 mm). cl carapace length from the tip of frontal margin to the posterior dorsal margin of the carapace; cw the width of the carapace measured at the widest part.
Pilodius miersi male (cl 7.5 mm cw 13 mm). A Dorsal view of carapace; B Third maxilliped; C Left cheliped; D Right cheliped;E-H First to fourth ambulatory legs; E′-H′ Enlargement of dictylus of first to fourth ambulatory legs; I Abdomen; J J′ First gonopod; K Second gonopod. Scale bars: A-K=1 mm J′=0.1 mm. cl carapace length from the tip of frontal margin to the posterior dorsal margin of the carapace; cw the width of the carapace measured at the widest part.
tubercles over upper surfaces while lower surfaces naked, black colored band encircled except distal margins; fingers massive, tips bluntly pointed, black colored; cutting margins of both fingers with triangular teeth; 2 rows of conical tubercles from proximal to medial parts on upper margins of movable fingers.
Ambulatory legs (
Fig. 6
E-H′) generally short, robust,covered with granules and setae; fourth ambulatory leg shortest; meri with spines on anterior margins; dactyli with spines on both margins, dactyls pointed end, tips curved, black colored.
Male abdomen (
Fig. 6
I) relatively narrow; segments 3 to 5 fused; lateral margins slightly concaved. Telson coniform.
Gonopods (
Fig. 6
J-K). First gonopod long, slender, recurved;proximal parts of both margins with setae; spoon-shaped tip, setose, with spines disto-medially. Second gonopod short, straight; proximal part of inner margin convex, with setae; tip spear-shaped.
Color of in life.
Generally reddish brown. Palms and fingers of chelipeds black.
Habitat.
Crevices of coral reef.
Distribution.
Australia, China, Japan, Singapore (Clark and Galil, 1993) and now to Korea.
Remarks.
Until now,
P. nigrocrinitus
was the only recorded
Pilodius
species in Korea (Ko and Takeda, 1999), therefore,
P. miersi
is the second species of the genus
Pilodius
.
Pilodius miersi
much resembles
P. nigrocrinitus
by having tuberculated anterolateral marings, however, they can be distinguished by the placement of black color in the palm of cheliped. Our specimen is almost identical to Clark and Galil’s description (1993). However, a minute difference is found in the ambulatory legs. According to Clark and Galil (1993), the dactyli of ambulatory legs are naked on anterior margins, while our specimen’s ambulatory legs are covered with spines.
Korean name: 1*주름부채게속 (신칭), 2*주름부채게 (신칭), 3*줄무늬부채게속 (신칭), 4*줄무늬부채게 (신칭)
Korean name: 1*검은손부채게 (신칭)
Acknowledgements
This research was carried out as a part of the project “The Survey of Korean Indigenous Species” supported by National Institute of Biological Resources (NIBR) of Ministry of Environment of Korea.
Clark PF
,
Galil BS
1993
A revision of the xanthid genusPilodiusDana 1851 (Crustacea: Brachyura: Xanthoidea)
Journal of Natural History
27
1119 -
1206
DOI : 10.1080/00222939300770691
Dai A
,
Yang S
1991
Crabs of the China Seas
China Ocean Press
Beijing
1 -
608
Dana JD
1851
On the classification of the Cancroidea. III. Zoology. Scientific intelligence
American Journal of Science and Arts Second Series
12
121 -
131
Guinot D
1967
La Faune Carcinologique (Crustacea Brachyura) de l’océan Indien Occidental et de la Mer Rouge. Catalogueremarques biogéographiques et bibliographie. In: Réunion de spécilalistes C. S. A. sur les Crustacés Zanzibar 1964
Memoires de l’Institut fondamental d’Afrique Noire
77
237 -
352
Guinot D
1968
Recherches preliminaires sur les groupements naturels Chez les Crustacés Décapodes Brachyoures. IV. Observations sur quelques generes de Xanthidae
Bulletin du Museum National d’Histoire Naturelle Paris
39
695 -
727
Ko HS
,
Takeda M
1999
New records of three xanthid crabs (Decapoda: Brachyura: Xanthidae) in Korea
Korean Journalof Systematic Zoology
KOI : KISTI1.1003/JNL.JAKO199911920829257
15
75 -
82
Lee SK
,
Park TS
,
Kim W
2010
New report of two xanthid crabs (Crustacea: Decapoda: Brachyura) from Korea
Korean Journal of Systematic Zoology
KOI : KISTI1.1003/JNL.JAKO201019451499281
26
87 -
91
DOI : 10.5635/KJSZ.2010.26.1.087
Milne Edwards A
1867
Description de quelques espéces Nouvelle de Crustacés Brachyures
Annales de la Société entomologique de France
7
263 -
288
Milne Edwards A
1873
Recherches sur la faune carcinologique de la Nouvelle-Calèdonie. Part II. Groupe des Cyclomètopes Portuniens
Nouvelles Archives du Musèum National d’Histoire Naturelle Paris
9
155 -
332
Minemizu R
2000
Marine Decapod and Stomatopod Crustaceans mainly from Japan
Bun’ichi Sogo Shuppan
Tokyo
(in Japanese)
1 -
344
Ng PKL
,
Guinot D
,
Davie PJF
2008
Systema Brachyurorum: Part 1. An annotated checklist of extant brachyuran crabs of the world
The Raffles Bulletin of Zoology
17
1 -
286
Ng PKL
,
Holthuis LB
2007
Case 3394.EtisusH. Milne Edwards1834 andChlorodiellaRathbun 1897 (Crustacea Decapoda Brachyura): proposed conservation of the generic names by suppression of the generic nameChlorodiusA. G.Dermarest 1823
Bulletin of Zoological Nomenclature
64
19 -
24
Rathbun MJ
1910
The Brachyura. In: The Danish expedition to Siam 1899-1900. V. Kongelige Danske Videnskabernes Selskabs Skrifter
Kjøbenhavn
5
301 -
367
Sakai K
2004
Crabs of Japan. World Biodiversity Database CD-ROM series
Expert Center for Taxonomic identification
Amsterdam
Sakai T
1965
The crabs of Sagami Bay collected by His Majesty the Emperor of Japan
Maruzen
Tokyo
(English) (in Japanese)
1/1 -
206/92
Sakai T
1976
Crabs of Japan and the adjacent seas
Kodansha
Tokyo
1 -
773
Serène R
1968
The Brachyura of the Indo-West Pacific region. In: Prodromus for a check list of the non-planktonic marine fauna of South East Asia. UNESCO Singapore National Academy of Sciences Special publication No. 1
Fauna
IIIC3
33 -
112
Serène R
1984
Crustacés Décapodes Brachyoures de I’Océan Indien occidental et de la Mer Rouge Xanthoidea: Xanthidae et Trapeziidae. Avec un addendum par Crosnier A: Capiliidae et Menippidae
Faune Tropicale
24
1 -
243
Stimpson W
1859
Prodromus descriptionis animalium evertebratorumquae in expeditione Pacific exploring expedition 1853-1856 Smithsonian miscellaneous collections
Proceedings of the Academy of Natural Sciences of Philadelphia
49
1 -
240
Takeda M
,
Kikuchi T
,
Miyake S
1978
Brachyura. In: Fauna and flora of the sea around the Amakusa Marine Biological Laboratory. Part II. Decapod Crustacea
Contributions of the Amakusa Marine Biological Laboratory of Kyushu University
245
32 -
45
Terada M
1982
Keys to the Japanese and foreign Crustaceans
Hokuryukan
Tokyo
1 -
284
Ward M
1936
Crustacea Brachyura from the coasts of Queensland
Memoirs of the Queensland Museum
11
1 -
3