Abstract
A new species of pseudocrangonyctid amphipod, Pseudocrangonyx wonkimisp. nov., was found in the groundwater of a cave in the southwestern Korean Peninsula. Pseudocrangonyx wonkimisp. nov. is morphologically most closely related to P. joolaeiLee et al., 2020. However, P. wonkimi is clearly distinguished from P. joolaei by lacking sternal gills, fewer setae on maxilla 1 inner plate, fewer serrate robust setae on the carpus of the gnathopods, lacking bifid setae on the inner ramus of pleopod 3, and fewer articles of rami on pleopod 3. We also determined sequences of mitochondrial cytochrome c oxidase subunit I (COI) of P. wonkimisp. nov. for molecular diagnosis. From the molecular analysis based on COI sequences, P. wonkimi showed the closest relationship with P. joolaei with 15.1% genetic distance.
Highlights
The genus Pseudocrangonyx Akatsuka & Komai, 1922 is one of the stygobitic groups of groundwater environments in Eastern Asia (Holsinger 1994)
P. wonkimi is clearly distinguished from P. joolaei by lacking sternal gills, fewer setae on maxilla 1 inner plate, fewer serrate robust setae on the carpus of the gnathopods, lacking bifid setae on the inner ramus of pleopod 3, and fewer articles of rami on pleopod 3
From the molecular analysis based on c oxidase subunit I (COI) sequences, P. wonkimi showed the closest relationship with P. joolaei with 15.1% genetic distance
Summary
The genus Pseudocrangonyx Akatsuka & Komai, 1922 is one of the stygobitic groups of groundwater environments in Eastern Asia (Holsinger 1994). These specimens were confirmed to represent a distinct new species through molecular analysis using the mitochondrial cytochrome c oxidase subunit I (COI) gene.
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