Pagurus erythrogrammus Komai, 2003

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2017, First report of Pagurus erythrogrammus (Crustacea: Decapoda: Anomura) from Korea, Journal of Species Research 6, pp. 54-57 : 54-55

Pagurus erythrogrammus Komai, 2003

ṚêỄŖḤộḓNj (ljḍ) ( Figs. 1, 2)

Pagurus erythrogrammus Komai, 2003: 133-141 , figs. 12-15, 24C, 25A; McLaughlin et al., 2010: 33 (list), fig. 15F.

Pagurus pilosipes : Miyake, 1978: 91 (part), fig. 34a (not Pagurus pilosipes ).

Material examined. 1♂ (sl 3.8 mm), Korea: Seogwipo , Jeju Is., 30 May 2013, Lee SH, SCUBA at 5 m depth .

Description. Shield ( Figs. 1, 2A) slightly longer than broad, about 1.1 times broader than long, dorsal surface with turf of setae; rostrum triangular, well developed, overreaching lateral projections; lateral margin sloped; posterior margin roundly truncated.

Ocular peduncles ( Figs. 1, 2A) shorter than sl, dorsomedial surface with 2 rows of setae; Ocular acicles ( Figs. 1, 2A) subovoid, terminal margin with submarginal spine.

Antennular peduncles ( Figs. 1, 2A) overreaching corneas by length of 0.1 of ultimate segment. Antennal peduncles ( Figs. 1, 2A) overreaching corneas.

Left third maxilliped ( Fig. 2D) moderately stout; ischium subrectangular, about 1.6 times longer than broad, inner margin denticulate, inner and outer margins with setae; merus with setae on inner margin, distal surface, and medial and distal part of outer margin; carpus and propodus with setae on inner margin and distal angle of outer margin; dactylus setose; exopod with setae on inner margin, approaching middle part of carpus.

Right cheliped ( Figs. 1, 2C) larger than left cheliped; chela subovoid, about 1.8 times longer than broad, covered with setae; dactylus slightly shorter than palm, middle line of dorsal surface with 2 rows of small spines, dorsomedial margin with small spines, cutting edge with row of calcareous teeth, terminating in small calcareous claw; palm slightly shorter than carpus, surface with 7 rows of small spines, dorsomedial and dorsolateral margins with row of small spines, cutting edge of fixed finger with teeth on proximal and distal parts, prominent tooth on medial part; carpus subequal in length to merus, broadened distally, dorsomedial and distal parts of dorsal surface with spinules and setae.

Left cheliped ( Figs. 1, 2B) shorter than right cheliped, approached to middle part of palm of right cheliped; chela subovoid, about twice longer than broad, covered with setae; dactylus longer than palm; dorsal surface with small spines; cutting edge with small corneous teeth; palm shorter than carpus, surface with 2 rows of spines, dorsolateral margin with row of small spines, cutting edge of fixed finger with row of calcareous teeth, 7 teeth on medial to distal part; carpus compressed laterally, dorsal surface with row of spines and setae.

Left second pereopod ( Figs. 1, 2E, E´) slender, long; dactylus as long as propodus, slightly curved, dorsal and ventral margins with setae, distal angle of dorsal margin with corneous spine, ventral margin with 11 long corneous spines; propodus about1.8 times longer than carpus, dorsal and ventral margins with setae, medial to distal part of ventral margin with 4 long corneous spines; carpus with distal angle spine on dorsal margin; merus with spines on medial part of ventral margin.

Left third pereopod ( Figs. 1, 2F, F´) slender, longest; dactylus as long as propodus, slightly curved, dorsal and ventral margins with setae, distal angle of dorsal margin with corneous spine, ventral margin with 12 long corneous spines, medial surface with row of 5 spines; propodus about 1.6 times longer than carpus, dorsal and ventral margins with setae, medial to distal part of ventral margin with 6 long corneous spines; carpus with distal angle spine on dorsal margin; merus with setae on dorsal and ventral margins.

Abdomen ( Fig. 1) twisted to rightward, with 3 unpaired pleopods in male and asymmetrical uropods.

Telson ( Fig. 2G) with long bristles on lateral surface, medial cleft indistinct; distal margin slightly concaved, with 6 small spines on each lobes.

Color in life ( Fig. 1). Shield reddish brown. Ocular peduncles with 2 longitudinal lines on dorsal surface. Chelipeds generally reddish brown, dactylus whitish yellow. Second and third pereopods generally whitish yellow, meri with 2 reddish brown lines on medial surfaces, carpi, propodi, and dactyli with 3 reddish brown lines on medial surfaces.

Habitat. Gastropod shell, intertidal to 75 m ( Komai, 2003).

Distribution. Japan ( Komai, 2003) and Korea.

Remarks. Pagurus erythrogrammus has similar characteristics to Boninpagurus pilosipes , Pagurus nigrivittatus , and Pagurus quinquelineatus as the known Korean species of the family Paguridae . However, P. erythrogrammus is distinguished by having a developed rostrum (vs. undeveloped in B. pilosipes , variable in P. nigrivittatus , undeveloped in P. quinquelineatus ), seven rows of spines on the dorsal surface of the right palm in male (vs. five rows in B. pilosipes , scattered P. nigrivittatus , six to seven rows P. quinquelineatus ), a row of spines on the medial surface of dactyli of the third pereopod, 12 long ventral spines of dactyli of the third pereopod (vs. five to seven in B. pilosipes , five to seven P. nigrivittatus, eight to 14 P. quinquelineatus), a minute medial cleft on the lateral margin of telson, and small spines on concaved distal margin of the telson (vs. a slightly minute medial cleft, oblique, and larger spines in B. pilosipes , a minute medial cleft P. nigrivittatus , slightly oblique, and larger spines, a wide medial cleft, slightly oblique, and small spines P. quinquelineatus ), and three reddish brown lines on lateral surfaces of propodi of the second and third pereopods (vs. four reddish brown in B. pilosipes , three dark brown P. nigrivittatus , five brick red of reddish brown P. quinquelineatus ) ( Komai, 2003). The present specimen agrees well with the description of the species by Komai (2003).