Lamprops donghaensis, Kim, Sung-Hyun & Kim, Young-Hyo, 2015

Kim, Sung-Hyun & Kim, Young-Hyo, 2015, Lampropsdonghaensis sp. n. (Crustacea, Cumacea, Lampropidae), a new species from Korean waters, ZooKeys 517, pp. 59-70 : 60-67

Taxon classification Animalia Cumacea Lampropidae

Lamprops donghaensis sp. n. Figures 1, 2, 3, 4, 5

Type material.

Holotype: adult male, 7.9 mm, NIBRIV0000317121, Geojin Port, Geojin-eup, Goseong-gun, Gangwon-do, Korea, 38°26'44"N 128°27'40"E, S.S. Hong and S.H. Kim, 11 April 2013. Paratypes: 320 males, 7.6-8.9 mm, DKUCUM 201501, 11 April 2013, same station data as holotype.

Additional material examined.

5 males, 7.9-8.4 mm, 15 February 2012, same station data as holotype; 1 male, 8.0 mm, Gangneung Port, Gyeonso-dong, Gangneung-si, Gangwon-do, Korea, 37°46'15.9"N, 128°57'05.2"E, S.S. Hong and S.H. Kim, 30 March 2012; 1 male, 8.3 mm, Cheongchoho, Cheongcho-dong, Sokcho-si, Gangwon-do, Korea, 38°12'01.7"N, 128°35'37.2"E, S.S. Hong and S.H. Kim, 12 April 2013; 9 males, 7.7-8.7 mm, 15 February 2014, same station data as holotype; 1 male, 8.6 mm, Oeongchi Port, Daepo-dong, Sokcho-si, Gangwon-do, Korea, 37°46'15.9"N, 128°57'05.2"E, S.S. Hong and S.H. Kim, 30 March 2012.

Description.

Holotype, adult male, NIBRIV0000317121.

Body (Fig. 2A) 7.9 mm long, surface with a scale-like sculpturing. Carapace (Fig. 2A, 2B) smooth, without oblique ridges, subovate in lateral view, subrectangular in dorsal view, 1.35 × wide, 0.23 × body, subequal to pereonites 1-5, dorsal carina reaching 0.94 × distal end of carapace. Pereonite 2 (Fig. 2A) with dorsal transverse groove, concave dorsomesially in lateral view, lateral portion with concave rounded area.

Antenna 1 (Fig. 2C) peduncle triarticulate; proximal article subequal to remaining articles combined, with 1 simple and 3 complex pedunculate setae subdistally; article 2 0.55 × proximal article, with 5 simple and 4 complex pedunculate setae distally; distal article 0.78 × article 2, with 2 simple and 3 complex pedunculate setae; main flagellum 4-articulated, with 5 aesthetascs and 6 simple setae; accessory flagellum short, 3-articulated, with 8 simple and 1 complex pedunculate setae.

Antenna 2 (Fig. 2D) elongate, slightly extending beyond end of telson; peduncle 5-articulated, article 2 stubby, subequal to article 3, with 2 plumose setae and short setules; articles 4-5 with numerous simple setae; each article of flagellum with 1 or 2 small simple setae.

Left mandible (Fig. 2E) boat-shaped, incisor with 4 cusps, with row of 9 lifting setae and lacinia mobilis.

Right mandible (Fig. 2F) similar to left one except incisor with 3 cusps and lacking lacinia mobilis.

Maxilla 1 (Fig. 2G) outer endite with row of 2 stout simple, 10 stout microserrate, and 1 stout serrate setae terminally, tufts of setules subterminally, 1 pappose seta and 6 setules on lateral margin; inner endite approximately half length of outer, with 1 pappose, 1 stout pappose, 1 stout microserrate, and 1 plumose setae terminally.

Maxilla 2 (Fig. 2H) broad endite with 8 plumose, 13 simple, 4 papposerrate, and 1 microserrate setae terminally, medial face with a row of 30 simple, 1 papposerrate, 3 serrate, 1 pappose, and hair-like setae; each outer and inner narrow endite with 7 or 3 stout microserrate setae terminally.

Maxilliped 1 (Fig. 3A) basis subrectangular, subequal to the following articles combined, medial lobe with 2 hook, 6 pappose, and hair-like setae medially, 1 stout knoblike, 2 simple, and 1 pappose setae distally; ischium absent; merus with 3 pappose setae medially; carpus subequal to merus, with plumose, simple, and comb-like setae medially, 1 plumose seta laterally; propodus with 4 plumose, 1 pappose, 1 papposerrate, and numerous simple setae distally; dactylus with 2 simple setae terminally.

Maxilliped 2 (Fig. 3B) basis elongate, longer than remaining articles combined, with 3 plumose and hair-like setae; ischium short, unarmed; merus 0.80 × carpus, with 1 plumose seta distally; capus with 11 plumose and 7 simple setae medially, 1 plumose and 1 simple setae laterodistally; propodus 0.80 × carpus, with 13 simple setae medially, 2 plumose setae distally; dactylus 0.51 × propodus, with 1 stout microserrate and 5 simple setae.

Maxilliped 3 (Fig. 3C) basis much longer than remaining articles combined, with 1 simple, 11 plumose setae, and tufts of setules posteriorly, 12 plumose and hair-like setae anteriorly, 2 plumo-annulate and 1 plumose setae anterodistally; ischium very short, with 1 small plumose seta posteriorly; merus 0.69 × carpus, with 1 pappose and 2 plumose setae posteriorly, 1 plumose seta anterodistally; carpus with 9 plumose and 7 simple setae posteriorly, 2 plumose setae anterodistally; propodus 0.47 × carpus, with 10 simple setae posteriorly, 1 plumose seta anterodistally; dactylus with 1 stout microserrate seta terminally, and 6 simple setae subterminally; exopod shorter than basis, flagellum with 1 simple and numerous plumo-annulate setae.

Pereopod 1 (Fig. 3D) basis somewhat curved, 1.29 × remaining articles combined, with 17 plumose, 2 papposerrate, 1 small simple setae, and tufts of setules posteriorly, 7 plumose and some hair-like setae anteriorly, 2 plumose and 1 small setae anterodistally; merus 0.45 × carpus, with 2 plumose setae posteriorly and anterodistally; propodus 0.64 × carpus, with 5 simple setae; dactylus 0.93 × propodus, with 2 microserrate and 12 simple setae, terminal seta elongate, slightly shorter than dactylus; exopod shorter than basis, flagellum with 1 simple and numerous plumo-annulate setae.

Pereopod 2 (Fig. 3E) basis slightly curved, 1.25 × remaining articles combined, with 1 simple, 8 plumose, 1 pappose setae, and tufts of setules posteriorly, row of 11 plumose setae anteriorly; carpus subrectangular, 1.96 × merus, with 2 plumose and 2 papposerrate setae posteriorly, 1 microserrate seta with single subapical setule anteriorly, 4 microserrate and 1 simple setae terminally; propodus short, 0.26 × carpus, with 1 simple seta with single subterminal setule; dactylus 1.72 × propodus, with 4 microserrate and 3 simple setae; exopod shorter than basis, flagellum with 1 simple and numerous plumo-annulate setae.

Pereopod 3 (Fig. 4A) basis longer than remaining articles combined, with 10 plumose setae posteriorly, 3 plumose and 1 complex pedunculate setae on lateral surface, 8 plumose setae anteriorly, and 2 plumose setae on medial surface; ischium short, 0.51 × merus, with 4 annulate, 1 simple, and 1 plumose setae; merus 0.95 × carpus, with 4 an nulate and 1 small simple setae posterodistally; propodus 0.77 × carpus, with 1 annulate and 1 complex pedunculate setae on lateral surface; dactylus 0.33 × propodus, with 1 simple seta on lateral surface, 1 stout microserrate and 1 simple setae terminally; exopod shorter than basis, flagellum with 1 simple and numerous plumo-annulate setae.

Pereopod 4 (Fig. 4B) basis longer than remaining articles combined, with 8 plumose and 1 complex pedunculate setae posteriorly, 3 plumose setae on lateral surface, 9 plumose and 1 complex pedunculate setae anteriorly, 2 plumose setae mediodistally; merus subequal to carpus, with 4 annulate and 1 simple setae on medial surface; carpus 1.34 × propodus; propodus longer than dactylus, with 1 annulate seta on lateral surface, 1 complex pedunculate seta posterodistally; exopod subequal to basis, flagellum with 1 simple and numerous plumo-annulate setae.

Pereopod 5 (Fig. 4C) basis subrectangular, 0.60 × remaining articles combined, with 5 plumose, 1 complex pedunculate, and 2 long plumo-annulate setae; ischium 0.40 × merus, with 5 annulate and 1 small simple setae anterodistally; merus subequal to carpus, with 5 annulate and 2 simple setae anteriorly; carpus 1.47 × propodus, with 3 annulate setae anteriorly, 1 long annulate and 2 long plumo-annulate setae posterodistally; propodus with 1 annulate seta posterodistally; dactylus 0.42 × propodus; exopod absent.

Telson (Fig. 4D) equilaterally triangular, width 0.53 × length, 1.42 × pleonite 6, without lateral setae, with 2 simple setae dorsomesially, 5 stout microserrate distal setae of which middle one is longest, a pair of neighboring setae short, 0.31 × middle one, the distolateral setae 0.74 × middle one.

Uropodal peduncle (Fig. 4D) 1.66 × telson, with a row of 17-18 small stout microserrate setae medially; endopod triarticulate, 0.87 × peduncle; proximal article 2.27 × article 2, with 16-17 small stout microserrate and 2 complex pedunculate setae medially; article 2 1.22 × distal article, with 8-9 small stout microserrate setae medially; distal article with 4 small stout microserrate setae medially, 1 stout microserrate and 2 unequal simple setae terminally; exopod biarticulate, slightly shorter than the endopod, proximal article 1.69 × article 2, with 6 plumose setae medially and 1 small simple seta on lateral distal corner; article 2 with 3 plumose setae medially, 2 small simple setae and 2 microserrate setae terminally.

Female. Unknown.

Remarks.

This new species resembles Lamprops comatus Zimmer, 1907, Lamprops carinatus (Hart, 1930), Lamprops flavus (Harada, 1959), Lamprops pumilio (Zimmer, 1937), Lamprops tomalesi Gladfelter, 1975, and Lamprops obfuscatus (Gladfelter, 1975) in lacking an oblique ridges on the carapace and lateral setae on the telson. Lamprops donghaensis sp. n., however, is distinguished from its congeners by the dorsal concave groove and lateral concave depressed area on pereonite 2. The characteristics are listed in Table 1 as well as in the key. The new species is more similar to Lamprops carinatus in having a similar medium-sized body, a similar terminal setae type of telson, and similar length ratio for the uropodal exopod and endopod (see Hart 1930, and Kim et al. 2015). However, the new species is distinguished from Lamprops carinatus by the combination of the following features ( Lamprops carinatus condition in parentheses): 1) pereonite 2 concave dorsally, with dorsal transverse groove and lateral rounded depressed area (flat dorsally, without dorsal groove and lateral depressed area); 2) maxilliped 3, basis with a row of plumose setae anteriorly (without plumose setae anteriorly); 3) telson 1.48 × pleonite 6 (1.31 × pleonite 6); 4) uropodal peduncle with 17-18 small stout microserrate setae (with 11 setae); 5) uropodal endopod, distal article with 4 microserrate setae medially (without microserrate seta).

Etymology.

The specific epithet donghaensis originates from the Korean word “Dong-Hae”, meaning the East Sea, named after the eastern Korean coast in which the species was discovered.

Habitat.

The new species was collected together with Lamprops carinatus and Lamprops pseudosarsi at the same location, in Geojin Port, Goseong-gun, Korea, which is a sandy substrate.

Distribution.

Geojin Port, Geojin-eup, Goseong-gun, Gangwon-do, Korea.