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Acrostichus ziaelasi n. sp. (Nematoda: Diplogastridae) isolated from the beetle Ziaelas formosanus, a tenebrionid symbiont of the termite Odontotermes formosanus with remarks on the genus Acrostichus Rahm, 1928

Kanzaki, Natsumi, Liang, Wei-Ren, Chiu, Chun-I, Li, Hou-Feng
Zoologischer Anzeiger 2020 v.286 pp. 20-30
Nematoda, Odontotermes, Tenebrionidae, female reproductive system, females, male genitalia, male reproductive system, males, new species, nucleotide sequences, phylogeny, ribosomal RNA, symbionts, Taiwan
A diplogastrid nematode species was isolated from a termite-associated tenebrionid beetle, Ziaelas formosanus, collected from several localities in Taiwan. The new species shares a characteristic feeding structure, i.e., an extremely long and thin stoma with two genera, Rhabditolaimus and Mehdinema. However, the new species has highly characteristic male and female reproductive system, i.e., arrangement of male genital papillae, spicule and gubernaculum morphologies, and presence of female receptaculum seminis, that are similar to those of Acrostichus. A molecular phylogenetic analysis based on near-full-length small subunit and D2-D3 expansion segments of large subunit of ribosomal RNA gene sequences suggested that the species belongs to Acrostichus. The highly derived feeding characters of the new species accentuates the plasticity of the feeding structures of diplogastrid nematodes. In addition to the species description, the generic characters of Acrostichus are emended, and a list of the species in the genus is provided.