Bodotria (Atlantobodotria) incarinata, Kim & Lee & Kim, 2020

Kim, Sung-Hyun, Lee, Chang-Mok & Kim, Young-Hyo, 2020, Three new species of the genus Bodotria (Crustacea: Cumacea: Bodotriidae) from the Yellow Sea in Korea, Zootaxa 4869 (1), pp. 55-77 : 57-59

Bodotria (Atlantobodotria) incarinata sp. nov.

( Figs 2–5 )

(Korean Name: Min-du-ma-di-cham-ol-chaeng-i-sae-u, new)

Type material. Holotype, adult male, 3.55 mm, cat no. NIBRIV0000812747, Anmok Harbour , Yeonpyeong I., Yeonpyeong-myeon , Ongin-gun, Incheon-si, Korea, 37° 39' 19.8"N, 125° 42' 23.7"E, depth 2–4 m, 23 August 2000, (Y.H. Kim) collected by light trap (dissected).

Additional material examined: 1 ♂, Hagampo Harbour , Banggal-ri, Taean-gun, Chungcheongnam-do, Korea, depth 2 m, 36° 54' 09.0"N, 126° 12' 24.4"E, 25 June 1998, (C.M. Lee) collected by light trap ; 1 ♂, Jinri Harbour , Jin-ri , Deokjeok-myeon , Ongjin-gun, Incheon-si, Korea, depth 2 m, 37° 13' 19.2"N, 126° 08' 37.6"E, 20 September 1998, (C.M. Lee) collected by light trap ; 1 ♂, Gyeokpo Port , Gyeokpo-ri, Buan-gun, Jeollabuk-do, Korea, depth 2–5 m, 35° 37' 22.2"N, 126° 28' 09.9"E, 16 May 2013, (N.H. Kim) collected by light trap .

Diagnosis. Adult male. Carapace longish ellipse in dorsal view, without dorso-lateral carina or ridge, dorsomedian carina marked over whole length of carapace, antennal notch shallow, antero-lateral corner rounded, pseudorostral lobes broadly truncated, ocular lobe triangular, with 8 lenses. Maxilliped 3 merus and carpus dilated. Pereopod 1 carpus not dilated. Pereopod 2 basis with plumose seta. Uropod peduncle with 3–4 plumose and 13–16 microserrate setae medially, endopod biarticulated. Female unknown.

Description. Holotype, adult male, 3.55 mm, cat no. NIBRIV0000812747.

Carapace ( Figs. 2 , 3A, B ) about 1/4 of body length, longish ellipse in dorsal view, 1.8 times as long as wide, 1.8 times as long as deep; surface covered with minute netlike patterns; dorso-median carina marked over whole length of carapace; without dorso-lateral carina and ridge; antennal notch shallow; antero-lateral corner rounded; pseudorostral lobes ( Fig. 3B ) broadly truncated and almost meeting in front of ocular lobe; ocular lobe ( Fig. 3B ) triangular, with 8 lenses. Pereon 0.6 times as long as carapace length. Pleon plump, 1.5 times as long as carapace and pereon together.

Antenna 1 ( Fig. 3C ) peduncle 3-articulate; article 1 1.2 times as long as remaining articles combined, with several hair-like, 6 simple, and 2 complex pedunculate setae; article 2 0.3 times article 1 length, with 2 simple and 3 complex pedunculate setae distally; article 3 1.6 times article 2 length, with 2 complex pedunculate setae terminally. Main flagellum 2-articulate; article 1 with 4 aesthetascs; article 2 with 2 aesthetascs, 4 long simple and 1 complex pedunculate setae terminally. Accessory flagellum very minute, with 2 short simple and 2 complex pedunculate setae.

Antenna 2 ( Fig. 3D ) extending beyond pereon; peduncle 5-articulated; article 1 unarmed; article 2 with 2 plumose setae; article 3 with 1 plumose seta; articles 4–5 with numerous simple setae.

Left mandible ( Fig. 3E ) with row of hair-like and 9 lifting setae; incisor with 5 teeth; lacinia mobilis with 3 teeth.

Right mandible ( Fig. 3F ) with row of hair-like and 10 lifting setae; incisor with 4 teeth.

Maxilla 1 ( Fig. 3G ) outer endite with 12 stout simple, 1 microserrate, and hair-like setae terminally; inner endite with 2 simple, 1 stout simple, 1 microserrate, and 1 tricuspid setae terminally; palp broken, with 2 setae.

Maxilla 2 ( Fig. 4A ) broad endite with several hair-like and 11 simple setae medially, several hair-like setae on medial face, 21 simple, 3 pappose, and 1 plumose setae terminally; outer endite with 6 simple setae terminally; inner endite with 4 microserrate and 2 simple setae terminally.

Maxilliped 1 ( Fig. 4B ) basis 1.3 times as long as remaining articles combined, with 2 simple, 1 long plumose, and 10 hair-like setae, medial lobe with 2 hook, 5 plumose, and 5 simple setae; ischium absent; merus 0.2 times basis length, with 2 plumose setae mediodistally; carpus 2.0 times merus length, with 4 plumose, 9 simple, and 5 beak setae medially, few hair-like setae on medial face, 1 long plumose seta laterodistally; propodus 0.5 times carpus length, with 5 simple, 2 plumose, and 1 long plumose setae distally; dactylus 0.7 times propodus length, with 4 simple setae terminally.

Maxilliped 2 ( Fig. 4C ) basis longer than remaining articles combined, with 1 short simple and several hairlike setae medially, 1 long plumose seta on medial distal corner, 4 short simple and 1 long simple setae laterodistally; ischium short, unarmed; merus with 1 long plumose seta mediodistally; carpus 0.8 times merus length, with 5 plumose and few hair-like setae medially, 1 short simple seta laterally; propodus 1.2 times carpus length, with 5 plumose setae medially, 2 long plumose setae laterally; dactylus 0.3 times propodus length, with 2 long simple, 2 simple, and 1 stout microserrate setae terminally.

Maxilliped 3 ( Fig. 4D ) basis 1.9 times as long as remaining articles combined, with numerous hair-like setae on both margins, 5 short simple setae medially, 2 plumose setae on medial distal corner, 1 simple seta on both faces; lateral corner very inflated, reaching to the middle of merus, with 3 long plumose and 3 plumose setae; ischium 0.1 times basis length, with 4 short simple and 2 plumose setae; merus 1.2 times ischium length, with 1 plumose seta medially, 3 short simple setae on lateral face, several hair-like setae laterally, 2 plumose setae on lateral corner; carpus 0.9 times merus length, with 5 plumose setae medially, 1 short simple seta on lateral face, 1 plumose seta on lateral corner; propodus 0.8 times carpus length, with 4 simple and 2 plumose setae medially, 1 short simple seta on lateral face; dactylus 0.5 times propodus length, with 7 simple, 1 stout microserrate, and few hair-like setae; exopod shorter than basis.

Pereopod 1 ( Fig. 4E ) basis 1.4 times as long as remaining articles combined, with numerous hair-like and 9 microserrate setae medially, 27 short simple setae and 2 short simple setae with single subterminal setule on lateral face, 1 long plumose and 1 plumose setae distally; ischium 0.06 times basis length, unarmed; merus 2.6 times ischium length, with 1 short simple seta and 2 short simple setae with single subterminal setule; carpus 1.2 times merus length, with 1 long simple, 1 short simple setae, and 2 short simple setae with single subterminal setule; propodus 0.8 times carpus length, with 2 short simple and 1 long simple setae medially; dactylus 0.8 times propodus length, with 1 short simple seta laterally, 1 simple and 3 long simple setae terminally; exopod shorter than basis.

Pereopod 2 ( Fig. 4F ) basis fused with ischium, subequal to remaining articles combined, with 2 long plumose, 1 complex pedunculate setae, and 1 short simple seta with subterminal setules medially, 1 short simple seta with subterminal setules on medial face, 1 broken, 2 complex pedunculate setae, and 2 short simple setae with subterminal setules laterally; merus 0.3 times basis length, with 1 simple seta with subterminal setules laterally, 1 stout microserrate seta with single subterminal setule distally; carpus subequal to merus length, with 1 short simple seta with single subterminal setule and 2 stout microserrate setae with subterminal plumose mediodistally, 2 simple setae with single subterminal setule laterally; propodus 0.4 times carpus length, unarmed; dactylus 2.4 times propodus length, with 1 short simple seta with single subterminal setule medially, 1 simple seta with subterminal setules and 1 simple seta with single subterminal setule laterally, 1 short simple, 1 simple setae, 1 long simple seta with subterminal setules, and 1 long simple seta with single subterminal setule terminally.

Pereopod 3 ( Fig. 5A ) basis subequal to remaining articles combined, with 1 complex pedunculate seta and 4 simple setae with subterminal setules proximally, 1 complex pedunculate seta and 3 simple setae with subterminal setules medially, 1 long plumose seta and 1 simple seta with subterminal setules laterally, 1 long plumose seta laterodistally; ischium 0.1 times basis length, with 2 annulate setae laterodistally; merus 1.8 times ischium length, with 2 annulate setae laterodistally; carpus 1.7 times merus length, with 1 simple seta with single subterminal setule medially, 1 annulate seta and 1 long annulate seta with single subterminal setule on medial distal margin, 1 simple seta laterally; propodus 0.7 times carpus length, with 1 annulate seta with single subterminal setule on medial distal corner, 1 complex pedunculate seta laterodistally; dactylus 0.5 times propodus length, with 1 short simple, 1 long simple, and 1 stout simple setae terminally.

Pereopod 4 ( Fig. 5B ) basis 0.7 times as long as remaining articles combined, with 2 complex pedunculate setae medially, 3 plumose setae on lateral face, 1 plumose seta laterodistally; ischium 0.2 times basis length, with 2 annulate setae laterodistally; merus 1.8 times ischium length, with 2 annulate setae laterodistally; carpus 1.7 times merus length, with 2 annulate setae with single subterminal setule mediodistally, 1 long annulate seta with single subterminal setule on medial distal margin, 1 simple seta laterally; propodus 0.6 times carpus length, with 1 annulate seta with single subterminal setule mediodistally; dactylus 0.5 times propodus length, with 1 short simple, 1 simple, and 1 stout simple setae terminally.

Pereopod 5 ( Fig. 5C ) basis 0.5 times as long as remaining articles combined, with 1 plumose and 1 complex pedunculate setae medially; 2 plumose setae laterally; ischium 0.2 times basis length, with 2 annulate setae laterodistally; merus 2.0 times ischium length, with 2 annulate setae laterodistally; carpus 1.4 times merus length, with 1 simple seta with single subterminal setule and 1 annulate seta mediodistally, 1 simple and 1 long annulate setae on medial distal margin; propodus 0.8 times carpus length, with 1 annulate seta mediodistally, 1 complex pedunculate seta laterodistally; dactylus 0.5 times propodus length, with 1 short simple and 1 stout simple setae terminally.

Uropod ( Fig. 5D ) peduncle 1.6 times pleotelson length, with 3–4 plumose and 13–16 microserrate setae medially. Uropod endopod biarticulate, 0.7 times peduncle length; article 1 3.0 times article 2 length, with 10 microserrate setae medially; article 2 with 1 microserrate seta mediodistally, 1 long microserrate seta terminally. Uropod exopod little longer than endopod length, article 1 unarmed; article 2 with 1 short simple and 6 plumose setae medially, 1 simple seta, 1 long simple seta with single subterminal setule, and 1 short simple seta with subterminal setules terminally.

Etymology. The new species name incarinata is from the combination of the Latin words in, meaning ‘no’ and carinatus, meaning ‘shaped like a keel’, alluding to the lack of any dorso-lateral carina on the carapace.

Remarks. This new species Bodotria (Atlantobodotria) incarinata sp. nov. is similar to B. (A.) corallina Mühlenhardt-Siegel, 2000 and B. (A.) nitida Day, 1978 in the combination of the following features: 1) carapace smooth, without dorso-lateral carina and lateral ridge or other structures; 2) antennal notch shallow in male; 3) antero-lateral corner rounded; 4) uropod endopod 2-articulate. B. (A.) nitida is easily distinguished from similar species because of the articulatory peg present between carapace and second pereonite dorso-laterally, and third to fifth pereonites slightly elevated dorsally. Also, the new species is obviously distinguished from B. (A.) corallina by the following features ( Table 1, condition of B. (A.) corallina in parenthesis) male: 1) carapace, dorsomedian carina marked over whole length of carapace (vs. dorso-median carina not pronounced); 2) maxilliped 3, exopod 6-articulate and shorter than basis; merus and carpus dilated; (vs. exopod 7-articulate and almost subequal to basis; merus not dilated); 3) pereopod 2, basis with plumose seta (vs. without plumose seta); 4) uropod endopod little shorter than exopod length (vs. little longer than exopod length).

Depth. 2–5 m.

Distribution. Korea (Yellow Sea).

Figures

FIGURE 2. Bodotria (Atlantobodotria) incarinata sp. nov., holotype, adult male, 3.55 mm: lateral view. Scale bar = 0.5 mm.

FIGURE 3. Bodotria (Atlantobodotria) incarinata sp. nov., holotype, adult male, 3.55 mm: A, habitus, lateral view; B, carapace and pereon, dorsal view; C, antenna 1; D, antenna 2; E, left mandible; F, right mandible; G, maxilla 1. Scale bars = 0.5 mm (A, B), 0.1 mm (D), 0.05 mm (C, E–G).

FIGURE 4. Bodotria (Atlantobodotria) incarinata sp. nov., holotype, adult male, 3.55 mm: A, maxilla 2; B, maxilliped 1; C, maxilliped 2; D, maxilliped 3; E, pereopod 1; F, pereopod 2. Scale bars = 0.1 mm (D–F), 0.05 mm (A–C).

FIGURE 5. Bodotria (Atlantobodotria) incarinata sp. nov., holotype, adult male, 3.55 mm: A, pereopod 3; B, pereopod 4; C, pereopod 5; D, pleotelson. Scale bars = 0.2 mm (D), 0.1 mm (A–C).