Abstract
Seven new species of semi-aquatic freshwater earthworms belonging to the genus Glyphidrilus Horst, 1889 are described from Thailand and Laos, Glyphidrilus nanensis Chanabun & Panha sp. n., G. satunensis Chanabun & Panha sp. n., G. chiangraiensis Chanabun & Panha sp. n., G. namphao Chanabun & Panha sp. n., G. sekongensis Chanabun & Panha sp. n., G. namdonensis Chanabun & Panha sp. n., and G. champasakensis Chanabun & Panha sp. n. The species are characterized by their external and internal morphological characteristics, as well as body sizes. Other morphological character differences between these seven species were also compared, and an identification key is provided. The relationships of the new species to congeners are discussed.
Highlights
The semi-aquatic freshwater earthworm genus Glyphidrilus Horst, 1889 has been known since the nineteenth century
The new species differs from G. vangviengensis Chanabun & Panha, 2011 from Song River, Vientiane, Laos by the latter having a shorter clitellum in XIX, XX–XXXV, XXXVI, XXXVII, widely paired genital markings in bc XVIII, XIX, XX, XXI–XXIV, XXXIII, XXXIV, paired on aa in XII, XIII, XIV, XV, and lacks spermathecae
The seven new species from Thailand and Laos presented in this paper range in size, with respect to the other Glyphidrilus members, from large to small, with G. champasakensis sp. n. being the longest and G. nanensis sp. n. the smallest
Summary
The semi-aquatic freshwater earthworm genus Glyphidrilus Horst, 1889 has been known since the nineteenth century. The behavior of animals has been observed, and it was noted that the worms leave their tail tips exposed near surface of their muddy habitats. While submerging they produce casts as do most earthworms (Chanabun et al 2013). Chanabun et al (2013) interpreted the phylogeography of Glyphidrilus in light of recent hypotheses regarding ancient river drainage patterns, especially the Mekong River and other main basins, plus various habitat types, using morphological characters and genetic data. The present paper provides additional new species with careful morphological descriptions but no additional genetic data. New species of semi-aquatic freshwater earthworm genus Glyphidrilus Horst, 1889
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