Review Article |
Corresponding author: Young-Hyo Kim ( amphipod74@gmail.com ) Academic editor: Charles Oliver Coleman
© 2015 Soon-Sang Hong, Jun-Haeng Heo, Young-Hyo Kim.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Hong S, Heo J, Kim Y (2015) A new species of Monoliropus Mayer, 1903 (Crustacea, Amphipoda, Caprellidae) from Korean waters. ZooKeys 517: 111-121. https://doi.org/10.3897/zookeys.517.9915
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A new species of the genus Monoliropus belonging to the family Caprellidae was collected from the Yellow Sea, Korea. The new species differs from Monoliropus agilis Mayer, 1903, M. kazemii Momtazi & Sari, 2013, and Triprotella amica Arimoto, 1970 as follows: 1) gnathopod 1 subrectangular; 2) pereonites 2–3 with acute triangular processes anterolaterally; 3) mandibular palp, apical article with four simple setae subdistally. The new species is fully illustrated and extensively compared with related species. This is the first record of the genus Monoliropus from Korean waters. A key to Monoliropus species is also given.
Monoliropus , Caprellidae , Amphipoda , new species, key, Korea
The genus Monoliropus Mayer, 1903 is one of 57 genera belonging to the family Caprellidae. Monoliropus is closely related to Metaprotella Mayer, 1890 and Triprotella Arimoto, 1970 and commonly characterized by having biarticulate flagellum of antenna 2; triarticulate mandibular palp; pereonites 3–4 with gills; uniarticulate pereopods 3–4; well developed, 6-articulate pereopod 5; in male, abdomen with a pair of biarticulate appendages and a pair of lobes (
Specimens were collected by light trap from the subtidal zone of Bukahng Port, Mokpo-si, Korea in 2012 (Fig.
Monoliropus agilis Mayer, 1903
Antenna 2, flagellum biarticulate, swimming setae absent; mandibular palp bi- or triarticulate; pereonites 3–4 with gills; pereopods 3–4 present, uniarticulate; in male, abdomen with a pair of uni- or biarticulate appendages and a pair of lobes.
The genus contains seven species, Monoliropus agilis Mayer, 1903, M. concavimanus Horton, 2008, M. enodis Rayol & Serejo, 2003, M. falcimanus Mayer, 1904, M. hapipandi Guerra-García, 2004, M. kazemii Momtazi & Sari, 2013, and M. tener Arimoto, 1968.
Holotype: male, 9.3 mm, NIBRIV0000309619, Bukhang Port, Jukgyo-dong, Mokpo-si, Jeollanam-do, Korea, 34°48'00"N, 126°21'56"E, S.S. Hong and S.H. Kim, by light trap from 6–8 m depth, 11 July 2012. Paratypes: female, 11.7 mm, NIBRIV0000309620, 27 July 2012, same station data as holotype; 6 males, 5.3–6.7 mm, DKUAMP201501, 11 July 2012, same station data as holotype; 2 immature males and 5 immature females, 5.3–7.1 mm, DKUAMP201502, 27 July 2012, same station data as holotype.
Holotype, male, NIBRIV0000309619.
Body (Fig.
Antenna 1 (Fig.
Antenna 2 (Fig.
Upper lip (Fig.
Lower lip (Fig.
Left mandible (Fig.
Right mandible (Fig.
Maxilla 1 (Fig.
Maxilla 2 (Fig.
Maxilliped (Fig.
Gnathopod 1 (Fig.
Gnathopod 2 (Fig.
Gill 3 (Fig.
Pereopod 3 (Fig.
Pereopod 4 (Fig.
Pereopod 5 (Fig.
Pereopod 6 (Fig.
Pereopod 7 (Fig.
Penes (Fig.
Abdomen (Fig.
Paratype, female (sexually dimorphic characters), NIBRIV0000309620.
Body (Fig.
The genus Monoliropus belongs to the family Caprellidae, which has close affinities with Metaprotella Mayer, 1890 and Triprotella Arimoto, 1970 as it possesses the following characters: 1) antenna 2, peduncles without swimming seta, flagellum biarticulate; 2) mandibular palp bi- or triarticulate; 3) pereopods 3–4 reduced, uniarticulate; 4) in male, abdomen with uni- or biarticulate appendages. However, Metaprotella is distinguished from Monoliropus by setal formula 1–x–y–1 of the distal article of mandibular palp and fused pereonites 6–7. Triprotella is very similar to the genus Monoliropus; however, is discernible from Monoliropus by setal formula 1-1-1 of the distal article of the mandibular palp, uniarticulate pereopods 3–4, morphology of the gnathopod 2, and form of abdomen (
Morphological characters of Monoliropus leeae sp. n. and closely related species.
Characters | Species (male) | ||||
---|---|---|---|---|---|
Monoliropus agilis | Monoliropus kazemii | Triprotella amica | Triprotella amica | Monoliropus leeae sp. n. | |
Body length (mm) | 4.0 | 8.5 | 5.4 | 6.3 | 9.3 |
Pereonites 2–3, anterior processes | × | ○ | no referred | × | ○ |
Right mandible, molar flake | ○ | × | no referred | ○ | ○ |
Mandibular palp, distal article, # of setae | 3 | 4 | 3 | 3 | 4 |
Maxilla 1, outer plate, # of setae | 7 | 7 | no referred | 5 setae | 6 setae |
Maxilliped, outer plate, distal margin | jagged | jagged | jagged | jagged | rounded |
Gnathopod 1, propodus | subtriangular, width 0.61 × length |
subtriangular, width 0.49 × length |
no referred | subtriangular, width 0.80 × length |
subrectangular, width 0.45 × length |
Gnathopod 1, dactylus serrations | inner margin | inner margin | no referred | both margins | inner margin |
Pereopods 3–4 | elongate, 2.7–2.9 × width |
elongate, 3.6–3.7 × width |
elongate | elongate, 3.5 × width |
short, 1.3–1.9 × width |
Abdominal appendage, # of setae | uniarticulate, no seta | biarticulate, 5 setae | uniarticulate, 1 seta | uniarticulate, 1 seta | uniarticulate, 4 setae |
Abdomen, dorsal lobe, # of setae | 2 terminal setae | 2 terminal setae | no referred | 2 terminal setae | 7 dorsal setae |
Distribution | Phuket, Thailand ( |
Persian and Oman Gulf, Iran ( |
Arabian Sea, Oman ( |
Mbudya island, Tanzania ( |
Mokpo-si, Korea (Present study) |
The specific name leeae is in honor of Dr. Kyung-Sook Lee, who has contributed to knowledge of Korean caprellid Amphipoda.
Bukhang Port, Jukgyo-dong, Mokpo-si, Jeollanam-do, Korea.
1 | Mandibular palp 2-articulate, with 1 single seta distally | M. hapipandi Guerra-García, 2004 |
– | Mandibular palp 3-articulate, with several setae distally | 2 |
2 | Gnathopod 2, propodus without grasping spine and process on palmar margin | M. tener Arimoto, 1968 |
– | Gnathopod 2, propodus with grasping spine and process on palmar margin | 3 |
3 | Pereopod 5, propodus with grasping spine | 4 |
– | Pereopod 5, propodus without grasping spine | 5 |
4 | Gnathopod 2, propodus, palmar margin straight | M. kazemii Momtazi & Sari, 2013 |
– | Gnathopod 2, propodus, palmar margin concave | M. falcimanus Mayer, 1904 |
5 | Abdominal appendage biarticulate | M. enodis Rayol & Serejo, 2003 |
– | Abdominal appendage uniarticulate | 6 |
6 | Gnathopod 2, propodus, palmar margin concave | M. concavimanus Horton, 2008 |
– | Gnathopod 2, propodus, palmar margin straight | 7 |
7 | Gnothopod 1, propodus subtriangular; pereopods 3–4 elongate, length > 2.5 × width | M. agilis Mayer, 1903 |
– | Gnothopod 1, propodus subrectangular; pereopods 3–4 short, length < 2.0 × width | M. leeae sp. n. |
We cordially thank Seong-Soo Hong who contributed to finding the new species and we greatly appreciate the suggestions and comments given from anonymous reviewers that improved the manuscript. This work was supported by a grant from the National Institute of Biological Resources (NIBR), funded by the Ministry of Environment (MOE) of the Republic of Korea (NIBR No. 2013-02-001).