Iphinoe indenticulata sp. nov. (Crustacea: Cumacea: Bodotriidae), a new Korean cumacean Author Kim, Sung-Hyun Author Kim, Young-Hyo text Zootaxa 2020 2020-02-12 4732 2 307 316 journal article 24068 10.11646/zootaxa.4732.2.5 615d9b12-afe8-4913-b787-68b7ae083d84 1175-5326 3663486 CD82B368-FD9A-4288-A087-5A7F89D94B88 Iphinoe indenticulata sp. nov. ( Figs. 1–4 ) (Korean Name: Min-deung-Gin-heo-ri-ol-chaeng-i-sae-u, new) Type material. Holotype , adult male, 6.04 mm , cat no. NIBRIV0000837778, Seokgeum Harbour , Dae-ri , Buangun , Jeollabuk-do , Korea , 35° 34’ 07.8”N , 126° 16’ 01.4”E , depth 2–5m , 23 June 2014 , ( S.S. Hong ) collected by light trap (dissected). Diagnosis. Carapace dorso-median carina not serrate, with setules only, without tooth or spine; antero-lateral angle with 3 serrations; ocular lobe subtriangular and lenses absent. Uropod peduncle 1.5 times pleonite 6 length, with 34–37 microserrate setae medially. Female unknown. Description. Holotype , adult male, 6.04 mm , cat no. NIBRIV0000837778. Carapace ( Figs. 1 , 2A ) about 1/4 of body length, subtriangular in dorsal view, 2.2 times as long as its width, 2.0 times as long as its deep; dorso-median carina with setules and without another structure; antero-lateral margin serrated; antennal notch and antero-lateral corner ( Fig. 2A ) prominent; ocular lobe ( Fig. 2B ) subtriangular and lenses absent. Pereon 0.8 times as long as carapace length. Pereonite 1 obscured laterally by anterior projection of pereonite 2. Pereonite 3 produced backwards. Pereonite 4 ventrolateral expansion overriding pereonite 3 and 5. Pleon plump, 1.3 times as long as cephalothorax length. FIGURE 1. Iphinoe indenticulata sp. nov. , holotype, adult male, 6.04 mm, Seokgeum Harbour, Dae-ri, Buan-gun, Jeollabukdo, Korea: lateral view. Scale bar = 1.0 mm. Antenna 1 ( Fig. 2C ) peduncle 3-articulate; article 1 0.8 times as long as remaining articles combined, with a few hair-like, 5 short simple, and 3 complex pedunculate setae distally; article 2 0.5 times article 1, with 4 short simple and 5 complex pedunculate setae distally; article 3 1.4 times article 2, with 5 short simple and 2 complex pedunculate setae. Main flagellum 2-articulate; article 1 with 8 aesthetasc; article 2 with 1 complex pedunculate, 2 long simple setae, and 1 aesthetasc terminally. Accessory flagellum very minute, with 1 short simple, 2 simple, and 2 complex pedunculate setae. Antenna 2 ( Figs. 2A, D ) extending beyond pleotelson; peduncle 5-articulated; article 2 with 2 plumose setae; article 3 with 1 plumose seta; articles 4–5 with numerous simple setae. Left mandible ( Fig. 2E ) with row of a few hair-like and 9 lifting setae; incisor with 4 teeth; lacinia mobilis with 3 teeth. Right mandible ( Fig. 2F ) with row of a few hair-like and 10 lifting setae; incisor with 3 teeth. Maxilla 1 ( Fig. 2G ) outer endite with a few hair-like setae on medial and lateral margins, 1 long plumose seta laterodistally, a few hair-like, 10 stout simple, 1 stout microserrate, and 1 stout plumose setae terminally; inner endite with a few hair-like setae on medial and lateral margins, 2 simple, 2 stout simple, 1 stout microserrate, and 1 stout plumose setae; palp with 2 setae. Maxilla 2 ( Fig. 3A ) broad endite with numerous hair-like, 11 plumose, 1 plumo-microserrate, and 1 stout simple setae medially, 23 simple, 4 plumose, 1 plumo-microserrate, and 1 stout long plumose setae terminally; outer and inner endites with a few hair-like setae on face, outer endite with 4 stout microserrate setae terminally; inner endite with 4 stout microserrate setae terminally. Maxilliped 1 ( Fig. 3B ) basis 1.1 times as long as remaining articles combined, with a few hair-like and 3 short simple setae, medial lobe with 2 hook and 6 plumose setae medially, 3 pappose and 2 plumose setae terminally; ischium absent; merus 0.3 times basis, with 2 plumose setae on medial distal corner, 1 short simple seta laterodistally, a few hair-like setae on distal margin; carpus 1.8 times merus, with a few hair-like, 5 plumose, 25 simple, 8 beak, and 1 long plumose setae; propodus 0.7 times carpus, with 2 long plumose, 3 plumose, and 9 simple setae distally; dactylus 0.5 times propodus, a few hair-like and 4 simple setae. FIGURE 2. Iphinoe indenticulata sp. nov. , holotype, adult male, 6.04 mm, Seokgeum Harbour, Dae-ri, Buan-gun, Jeollabukdo, Korea: A, habitus, lateral view; B, cephalothorax, dorsal view; C, antenna 1; D, antenna 2; E, left mandible; F, right mandible; G, maxilla 1. Scale bars = 1.0 mm (A, B), 0.1 mm (D), 0.05 mm (C, E–G). FIGURE 3. Iphinoe indenticulata sp. nov. , holotype, adult male, 6.04 mm, Seokgeum Harbour, Dae-ri, Buan-gun, Jeollabukdo, Korea: A, maxilla 2; B, maxilliped 1; C, maxilliped 2; D, maxilliped 3; E, pereopod 1. Scale bars = 0.2 mm (D, E), 0.1 mm (C), 0.05 mm (A, B). Maxilliped 2 ( Fig. 3C ) basis 1.5 times as long as remaining articles combined, with numerous hair-like, 3 short simple, and 1 long plumose setae; ischium short, unarmed; merus 0.2 times basis, with 1 long plumose seta mediodistally, several hair-like setae on lateral face, 1 short simple seta laterodistally; carpus 1.3 times merus, with 10 plumose and 1 long plumose setae medially, a few hair-like setae on lateral face; propodus 0.7 times carpus, with 2 long plumose, 5 plumose, and 18 simple setae; dactylus 0.4 times propodus, with 3 simple and 1 stout microserrate setae terminally. Maxilliped 3 ( Fig. 3D ) basis 1.9 times as long as remaining articles combined, with numerous hair-like setae on both margins, 1 short simple seta with subterminal setules and 5 plumose setae mediodistally, a few hair-like setae and 3 short simple setae with subterminal setules on lateral distal face, 1 short simple seta on medial distal face, 1 short simple seta with subterminal setules laterally; lateral corner very inflated, reaching to the distal margin of the merus, with 10 plumose setae; ischium 0.1 times basis, with a few hair-like and 2 plumose setae medially, 2 simple setae with subterminal setules on lateral distal face; merus 1.5 times ischium, with a few hair-like, 1 short simple, and 1 plumose setae medially, 2 short simple setae and 1 simple seta with subterminal setules on lateral face, several hair-like setae laterally, 2 plumose setae on lateral corner; carpus 1.2 times merus, with several hair-like, 4 simple, and 1 long simple setae medially, 1 plumose seta on lateral distal corner; propodus 0.5 times carpus, with 6 simple setae mediodistally, 2 plumose setae laterally; dactylus subequal to propodus, with a few hair-like setae medially, 1 broken seta laterally, 4 long simple setae terminally; exopod shorter than basis. Pereopod 1 ( Fig. 3E ) basis 1.3 times as long as remaining articles combined, with numerous hair-like setae on both margins, 10 stout simple setae and 13 short simple setae with subterminal setules medially, 1 plumose seta and tooth on medial distal margin, 1 short simple seta with subterminal setules on lateral distal face, 6 short simple setae with subterminal setules laterally; ischium 0.1 times basis, with 1 plumose seta on near medial distal margin; merus 1.6 times ischium, unarmed; carpus 1.3 times merus, with 1 short simple seta mediodistally; propodus 0.9 times carpus, with 1 short simple, 5 simple, and 3 long simple setae medially; dactylus 0.9 times propodus, with 1 short simple, 3 simple, and 1 long simple setae medially, 3 long simple setae terminally; exopod shorter than basis. Pereopod 2 ( Fig. 4A ) basis fused with ischium, subequal to remaining articles combined, with 1 short simple, 5 long plumose setae, and 2 short simple setae with subterminal setules medially, 1 short simple and 1 long plumose setae on near medial distal margin, 1 complex peduculate and 5 short simple setae on lateral face, 1 short simple, 1 complex pedunculate, 3 long plumose setae, and 3 short simple setae with subterminal setules laterally; merus 0.3 times basis, with 1 short simple seta with single subterminal setule and 1 stout long simple seta with subterminal setule mediodistally, 1 short simple seta laterodistally; carpus 1.2 times merus, with 1 short simple seta with single subterminal setule mediodistally, 1 stout simple seta on medial distal face, 1 short simple seta with single subterminal setule on near lateral distal magin; propodus 0.4 times carpus, with 1 simple seta on medial face, 1 short simple seta with single subterminal setule on lateral distal face; dactylus 2.5 times propodus, with 1 simple seta on medial face, 1 short simple seta laterally, 3 microserrate, 3 annulate, and 1 long annulate setae terminally. Pereopod 3 ( Fig. 4B ) basis 1.3 times as long as remaining articles combined, with 4 plumose setae medioproximally, 1 complex pedunculate seta and 3 short simple setae with subterminal setules mediodistally, 3 short simple and 4 complex pedunculate setae on lateral face, 6 plumose, 1 long plumose setae, and 2 short simple setae with single subterminal setule laterally; ischium 0.1 times basis, with 1 simple seta on medial distal face, 1 plumose and 2 annulate setae laterodistally; merus 2.0 times ischium, with 1 simple and 1 complex pedunculate setae laterodistally; carpus 0.8 times merus, with 1 short simple seta medially, 3 long annulate setae mediodistally, 1 simple and 1 annulate setae on lateral distal face; propodus 0.7 times carpus, with 1 complex pedunculate and 1 annulate setae mediodistally; dactylus 0.3 times propodus, with 1 simple and 1 annulate setae terminally. Pereopod 4 ( Fig. 4C ) basis subequal to remaining articles combined, with 3 short simple and 2 complex pedunculate setae medially, 1 short simple, 4 plumose setae, and 2 short simple setae with subterminal setules on lateral face, 1 short simple, 1 plumose, and 1 long plumo-annulate setae laterodistally; ischium 0.2 times basis, with 1 plumose and 3 annulate setae laterodistally; merus 1.4 times ischium, with 1 short simple and 1 annulate setae mediodistally, 1 simple and 1 annulate setae laterodistally; carpus subequal to merus, with 1 simple and 1 annulate setae mediodistally, 1 simple and 3 long annulate setae on medial distal margin, 1 short simple, 1 simple, and 1 annulate setae laterally; propodus 0.5 times carpus, with 1 long annulate seta on medial distal corner, 1 complex pedunculate seta laterodistally; dactylus 0.3 times propodus, with 1 simple and 1 long annulate setae terminally. FIGURE 4. Iphinoe indenticulata sp. nov. , holotype, adult male, 6.04 mm, Seokgeum Harbour, Dae-ri, Buan-gun, Jeollabuk-do, Korea: A, pereopod 2; B, pereopod 3; C, pereopod 4; D, pereopod 5; E, pleotelson. Scale bars = 0.3 mm (E), 0.2 mm (A–D). TABLE 1. Comparison of morphological characteristics among Iphinoe indenticulata sp. nov. and related species (Based on males).

Characteristics	Species
and distribution	I . indenticulata (adult)	I . sagamiensis (adult)	I . tenera	I . tenera (adult)	I . sagamiensis (adult)	I . tenera (subadult)
The values in parentheses were measured through the figure.
Body length	6.04 mm	6.2–6.7 mm	6.5 mm	(4.3 mm /	5.3 mm (adult)	6.0 mm (subadult)
Carapace, length	about 1/4 of body length,	1/4,	unkown	wrong scale bar?) (more 1/4)	about 1/5,	1/4,
dorso-median carina	2.2 × width with only setules	nearly 3 × with forwardly directed	without serration	(unkown) without serration	about 2 × width with forwardly directed	(2.6 ×) with forward directed 10
tooth and 4 spaced	tooth and 4 spaced	teeth
antero-lateral angle	with 3 serrations	minute spinules with 6 serrations	without serration	(without serration)	minute teeth with about 5 teeth	(with about 4 teeth)
Antenna 1, article 1	1.3 × article 3	much longer than	unkown	unkown	(1.4 ×)	subequal to article 3
article 2	0.7 × article 3	much shorter than	unkown	unkown	(0.8 ×)	(0.7 ×)
Pereopod 1, basis	1.3 × remaining articles	much shorter than	unkown	unkown	about 0.9 ×	1.4 ×
structure	combined with numerous hair-like and	serrated on both	unkown	unkown	with numerous hairs	(serrated on both margin,
short simple setae on both	margins, with plumose	inner margin, 14–17	with row of setae, hair like
margins, 10 stout simple and 3	hairs and several teeth	setae on surface,	setae medial margin), 2
short simple setae proximally,	on distal edge	plumose seta and several	teeth and 1 plumose seta on
Uropod peduncle, length	tooth and 1 plumose seta distally 1.5 × pleonite 6	longer than / (1.1 ×)	unkown	(2.1 x)	teeth on distal margin about 1.3 ×	distal portoin (1.4 ×)
medial margin	with 34–37 microserrate setae	with about 13 spines	with about 20	unkown	with 26 pectinated spines	with 5 or 6 spines and 6 or
and 30 plumous spines	small spines and	7 plumose hairs
Uropod endopod, length	0.7 × peduncle	much shorter than /	seta (0.6 ×)	(0.6 ×)	(0.7 ×)	(0.7 ×)
medial margin of article 1	with 5 stout simple setae with	(0.7 ×) with about 10 spines	with 6 setae	unkown	with 8 pectinated spines	with 3 or 4 strong spines
medial margin of article 2	single subterminal setule with 7 stout microserrate setae	with 16 spines	with 7 setae	unkown	with about 10–12	with 5 or 6 strong spines
lateral margin of article 2	with single subterminal setule with 4 plumose setae	with 6 plumous hairs	with 5 setae	unkown	pectinated spines with 4 plumose setae	(with 4 or 5 plumose setae)
terminal of article 2	with 2 plumose setae	with 2 plumous hairs	with 2 setae	unkown	with 2 long plumose	(with 2 plumose setae)
Distribution	Buan-gun, Yellow Sea	Sagami Bay	Qingdao, China	Shandong, China	setae Yellow Sea	Yellow Sea
(present study)	( Gamô, 1962 )	( Lomakina, 1960 )	( Liu & Liu, 1990 )	( Lee & Lee, 1998 )	( Park et al ., 1998 )

Pereopod 5 ( Fig. 4D ) basis 0.9 times as long as remaining articles combined, with 1 plumose, 2 complex pedunculate setae, and 1 short simple seta with single subterminal setule medially, 2 short simple and 1 complex pedunculate setae on lateral face, 2 short simple setae with subterminal setules and 4 plumose setae laterally; ischium 0.3 times basis, with 1 simple seta on near medial distal margin, 1 plumose and 2 annulate setae laterodistally; merus 1.5 times ischium, with 1 short simple seta on medial distal face, 2 short simple setae on lateral face, 1 annulate seta laterodistally; carpus 0.9 times merus, with 1 short simple and 5 annulate setae mediodistally, 1 annulate seta laterally; propodus 0.6 times carpus, with 1 complex pedunculate and 1 long annulate setae mediodistally; dactylus 0.3 times propodus, with 1 simple seta medially, 1 simple and 1 long annulate setae terminally. Uropod ( Fig. 4E ) peduncle 1.5 times pleonite 6, with 34–37 microserrate setae medially, 8–10 short simple setae with single subterminal setule laterally. Uropod endopod biarticulated, 0.7 times peduncle, article 1 with 4 stout simple setae with single subterminal setule and 1 stout microserrate seta with single subterminal setule medially, 0–1 short simple seta on lateral face, 0–1 short simple and 3 complex pedunculate setae laterally; article 2 with 7 stout microserrate setae with single subterminal setule and 6 plumose setae. Uropod exopod subequal to endopod, article 1 with 1–2 plumose setae medially, 1 short simple seta with single subterminal setule laterodistally; article 2 with 0–1 short simple seta with single subterminal setule and 21 plumose setae. Etymology. The new species name indenticulata is from the combination of the Latin words in , meaning ‘no’ and, denticulatum meaning ‘denticulate’, alluding to the lack of ornamentation (tooth or spine) on the dorso-median carina of the carapace. Remarks. This new species Iphinoe indenticulata sp. nov. is similar to I . sagamiensis Gamô, 1958 and I . tenera Lomakina, 1960 in the combination of the following features: 1) carapace form and ratio with body length; 2) carapace without dorso-lateral carina; 3) uropod peduncle longer than rami. However, the new species is obviously distinguished from its congeners by a combination of the following features (based on list in Table 1 ): 1) carapace dorso-median carina with setules only ( vs . with forwardly directed tooth and 4 spaced minute spinules in I . sagamiensis ; without serration, tooth, and spinule in I . tenera ); 2) carapace antero-lateral angle with 3 serrations ( vs . with 6 serrations in I . sagamiensis ; without serration in I . tenera ); 3) uropod peduncle 1.5 × pleonite 6 ( vs . 1.1 × pleonite 6 in I . sagamiensis ; 2.1 × pleonite 6 in I . tenera ); 4) uropod peduncle with 34–37 microserrate setae medially, 8–10 short simple setae with single subterminal setule laterally ( vs . with 13 spines and 30 plumous spines medillay, without seta laterally in I . sagamiensis ; about 20 small spines and seta medillay, without seta laterally in I . tenera ); 5) uropod endopod 0.7 × peduncle ( vs . 0.7 × peduncle in I . sagamiensis ; 0.6 × peduncle in I . tenera ). Distribution. Korea (Dae-ri, Buan-gun).