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The luminous earthworm    Pontodrilus   litoralis    (Grube, 1855) occurs in a very wide range of subtropical and tropical coastal areas. Morphometrics on size variation (number of segments, body length and diameter) and genetic analysis using the mitochondrial cytochrome c oxidase subunit 1 ( COI ) gene sequence were conducted on 14 populations of    P.   litoralis    from Southeast Asia and Japan. Statistical inference on morphometric data revealed significantly different size variations in the body length and diameter among these 14 populations of    P.   litoralis   . However, discordance between the morphometric and mitochondrial  COI  gene-based phylogenetic analyses was evident, where the size variations in    P.   litoralis    showed a different pattern from the  COI  genetic differences. The update on the current distribution of    P.   litoralis    is reported and revealed different aspects of the littoral habitat characteristics between Southeast Asia and Japan.

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Size variation and geographical distribution of the luminous earthworm    Pontodrilus   litoralis    (Grube, 1855) (  Clitellata  ,   Megascolecidae  ) in Southeast Asia and Japan