Peltogasterella gracilis ( Boschma, 1927 )

Jung, Jibom, Yoshida, Ryuta & Kim, Won, 2019, Ophiacantha scissionis Lee & Stöhr & Bae & Shin 2019, sp. nov., Zoological Studies (Zool. Stud.) 58 (33), pp. 1-12 : 12-13

Peltogasterella gracilis ( Boschma, 1927) ( Fig. 5I, 5J )

Peltogasterella Krüger, 1912

Material examined: On Pagurus filholi : 1 Ind., Gyeongju, 35°48'17.25"N 129°30'13.41"E, 25 Jan. 2015, Coll. Jung J, MADBK 160707_039, host: male, SL 4.3 mm; 1 Ind. (3 externae), Yeosu, 34° 1'10.11"N 127°18'19.22"E, 25 Apr. 2013, Coll. Park JH, MADBK 430102_001, host: female, SL 3.7 mm.

On P. lanuginosus : 1 Ind., Busan, 35 ° 04'07.28"N 129 ° 03'52.95"E, 7 Oct. 2015, Coll. Jung J, MADBK 160712_040, host: female, SL 4.9 mm; 2 Inds. (5 externae and 7 externae), Taean, 18 May 2000, EVOSYS 260712#023, hosts: female, SL 5.5 mm; female, SL 5.4 mm; 1 Ind. (5 externae), Uljin, 37 ° 0'9.87"N 129 ° 25'23.09"E, 16 Aug. 2011, Coll. Lee S, MADBK 160712_020, host: female, SL 6.3 mm; 1 Ind. (11 externae), Ulsan, 35 ° 38'32.50"N 129 ° 30'36.44"E, 30 Apr. 2009, Coll. Shin M, MADBK 160712_006, host: male, SL 8.0 mm.

On P. maculosus : 1 Ind. (6 externae), Gangneung, 37°54'37.03"N 128°51'11.41"E, 21 Oct. 2010, Coll. Lee SK, MADBK 160722_004, host: male, SL 7.0 mm; 1 Ind., Pohang, 36°0'40.98"N 129°37'29.58"E, hand, 17 Sep. 2011, Coll. Jung J, MADBK 160722_013, host: male, SL 5.4 mm; 1 Ind., Ulleoung, 37°27'32.54"N 130°51'23.42"E, Scuba, 16 Nov. 2013, Coll. Park JH, MADBK 160722_024, host: female, SL 4.7 mm.

On P. middendorffii : 1 Ind. (5 externae), Goseong, 38 ° 28'1.05"N 128 ° 33'33.66"E, 25 Jul. 2011, Coll. Lee SK, MADBK 160713_007, Host: male, SL 7.0 mm.

On P. pectinatus : 1 Ind., Busan, 35 ° 8'16.83"N 129 ° 9'37.01"E, 12 Nov. 2010, Coll. Kim SH, MADBK 160715_016, host: male, SL 7.2 mm; 1 Ind., Uljin, 36 ° 58'40.71"N 129 ° 25'8.81"E, 2 Jul. 2009, Coll. Yeom D, MADBK 160715_005, host: male, SL 9.1 mm; 1 Ind., Yeongdeok, 10 Aug. 1971, Coll. Rho BJ, EWUNHM DP 20151202019, host: female, SL 8.3 mm.

On P. spina : 1 Ind., Ulleung, 37°27'32.54"N 130°51'23.42"E, Scuba, 16 Nov. 2013, Coll. Park JH, MADBK 160726_003, host: male, SL 4.1 mm.

Hosts: Discorsopagurus schmitti , Labidochirus splendescens , Pagurus aleuticus , P. dalli , P. edwardsi , P. filholi , P. hemphilli , P. hirsutiusculus , P. lanuginosus , P. maculosus , P. middendorffii , P. nigrivittatus , P. ochotensis , P. pectinatus , P. spina ( Paguridae ).

Distribution: Western United States, Chile, Peru, eastern Russia, Japan, Korea.

Remarks: Many aspects of the externa morphology of the examined materials agreed with that of the original description ( Boschma 1927) and re-description of Peltogasterella gracilis by Yoshida et al. (2014), such as elongate and colonial externae, terminal-posited circular-opened mantle aperture, and no chitinous shield, the exception being the projection of mantle aperture, which was elevated. In addition, the mitochondrial sequences of the examined materials (MK604152-MK604158, MK604168-MK604173) were similar to those reported for this species (AB778077, AB778114) by Yoshida et al. (2014). A total of 14 host hermit crab species for P. gracilis have been reported ( McDermott et al. 2010; Yoshida et al. 2014), and Pagurus spina is newly recorded as a peltogastrid host in the present study.

In the present, the DNA sequence of the specimen on P. middendorffii could not be obtained; however, the morphological characteristics of the specimens were similar to those of Peltogasterella gracilis . Thus, we identified the specimen as P. gracilis .

Figures

Fig. 5. Korean peltogastrids. A, Peltogaster lineata on Pagurus brachiomastus and its mantle, MADBK 430101_001; B, Peltogaster postica on Pagurus filholi, MADBK 160707_009; C, mantle of B; D, Peltogaster aff. ovalis on Pagurus rathbuni, EVOSYS 260720#013; E, mantle of D; F, G, Peltogaster aff. reticulatus on Pagurus proximus and its mantle, MADBK 160718_040; H, Peltogaster sp. 2 on Areopaguristes nigroapiculus and its mantle, EVOSYS 260510#008; I, Peltogasterella gracilis on Pagurus pectinatus, MADBK 160715_016; J, mantle of I; K, Peltogasterella aff. gracilis on Porcellanopagurus nihonkaiensis, MADBK 160730_002.