Corresponding author: Koraon Wongkamhaeng (
Academic editor: C.O. Coleman
The beach-hopper and land-hopper genus
Wongkamhaeng K, Dumrongrojwattana P, Pattaratumrong MS (2016) Two new species of
The talitrid amphipod genus
In Southeast Asia, thirteen species of
This study is based upon material collected from leaf litter of Phutsa Reservoir in Nakhon Ratchasima, north-eastern Thailand and a man-made swamp in Burapha University, eastern Thailand in March and April 2016 respectively. Samples were collected using hand-nets and were then carefully transferred into plastic containers and fixed in 10% buffered formalin. In the laboratory, amphipod specimens were sorted out and stored in 70% alcohol. The animals were then examined under a compound microscope and later selected for dissection. The appendages of the dissected specimens were examined and figures were produced using camera lucida attached to an Olympus CH30 light microscope. The pencil drawings were scanned and digitally inked using a WACOM bamboo CTH-970 graphics board following the method described in
antenna
gnathopod
head
lower lip
mandible
maxilla
maxilliped
pereopod
pleopod
telson
uropod
urosome
upper lip
right
eft
male
female
Type material has been deposited at Prince of Songkla University Zoological Collection
1 | Male gnathopod 1: posterior margin of carpus and propodus each with a lobe covered in palmate seta; uropod 3 peduncle with three robust setae |
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– | Male gnathopod 1 posterior margin of merus, carpus and propodus each with a lobe covered in palmate seta; uropod 3 peduncle with two robust setae |
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2 | Gnathopod 2 extending between 31–35% along the posterior margin; uropod 1 peduncle with 4-6 robust setae; uropod 3 ramus without marginal robust setae; telson apically incised with four robust setae per lobe |
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– | Gnathopod 2 reaching between 36–40% along posterior margin; uropod 1 peduncle with more than six robust setae; uropod 3 ramus with a marginal robust seta; telson apically incised with five robust setae per lobe |
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Holotype. ♂, THAILAND, North-eastern Thailand, Phutsa Reservoir, Nakhon Ratchasima (
Named after Chaichat Boonyanusith in appreciation of his contribution to the terrestrial amphipod study in Thailand.
Land-hoppers (truly terrestrial). Size 5.5 mm. Sexual dimorphism present.
Based on male, holotype, 5.5 mm,
Terrestrial, most prefer living in
North-eastern Thailand.
Holotype. ♂, THAILAND, Eastern Thailand, Man-made swamp in Burapha University, Chonburi (
Named for Burapha University where the man-made swamp is the type locality of the species.
Supralittoral (325 m from the Bang San Beach). Size 6.3 mm. Sexual dimorphism present.
Based on male, holotype, 6.3 mm,
Fresh water swamps in Burapha University.
Eastern Thailand.
The characters of
A summary of the diagnostic characteristics that serve to distinguish closely related
Species | Body length (mm) | Left mandible lacinia mobilis | Gnathopod 1 | Gnathopod 1 carpus | Pleopod 1–3 peduncle | Slit on epimera 2 and 3 | Uropod 1 peduncle | Uropod 3 peduncle | Telson |
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5.5 | 4-dentate | Posterior margin of merus, carpus and propodus each with lobe covered in palmate setae | 2.6 × as long as broad, palm extending 33% along posterior margin | Without marginal setae | 27 and 20 slits | With 6 robust setae | Peduncle with 2 robust setae, rami 1.8 as long as broad without marginal setae | Dorsal midline at least halfway with 4 setae per lobe | |
6.3 | 4-dentate | Posterior margin of merus, carpus and propodus each with lobe covered in palmate setae | 2 × as long as broad, palm extending 37% along posterior margin | Without marginal setae | 25 and 15 slits | With 9 robust setae | Peduncle with 2 robust setae, rami 2.2 x as long as broad with a marginal seta | Dorsal midline at least halfway with 5 setae per lobe | |
6.5 | 4-dentate | Posterior margin of merus, carpus and propodus each with lobe covered in palmate setae | 1.9 × as long as broad, palm extending between 46-50% along posterior margin | With marginal robust setae | 22 and 5 slits | With 8 robust setae | Peduncle with 2 robust setae, rami 1.8 as long as broad without marginal setae | Dorsal midline entire with 3 setae per lobe | |
10.5 | Male 4-dentate, female 6-dentate | Posterior margin of carpus and propodus each with lobe covered in palmate setae | 2 × as long as broad, palm extending 27% along posterior margin | Without marginal setae | 21 and 13 slits | With 6 robust setae | Peduncle with 2 robust setae, rami 1.9 as long as broad with a marginal seta | Dorsal midline vestigial or absent with 5 setae per lobe |
The authors would like to thank Dr. Chaichat Boonyanusith for providing specimens for study and being a source of inspiration for this work. We gratefully acknowledge Dr. Charles Oliver Coleman from the Museum of für Naturkunde in Berlin, Germany and Dr. Jim Lowry from the Australian Museum in Sydney for their assistance with the literature. This work was partially financial supported by Research Grant of Burapha University through National Research Council of Thailand (Grant no. 6/2559).