Abstract
Anguillonema amolensis n. sp. is described and illustrated based on its morphological, morphometric, and molecular characters. The new species is characterized by its 575 to 820 μm long and wide body (body width at vulva = 30 to 59 μm), irregularly ventrally curved after fixation, five to six lines in lateral fields, 6.0 to 7.5 μm long stylet with small rounded knobs, pharynx lacking a median bulb, pharyngo-intestinal junction anterior to nerve ring and excretory pore, females with monodelphic-prodelphic reproductive system, 15 to 19 μm long conical tail with broad rounded tip, and males absent. The new species is compared with two known species of the genus, Anguillonema poligraphi and A. crenati. Molecular phylogenetic studies of the new species using partial sequences of small subunit (SSU) rDNA revealed that it forms a clade with an unidentified nematode species and two species of the genus Howardula. In phylogenetic analyses using partial sequences of the 28S rDNA (D2-D3 segment), the new species formed a monophyletic group with species belonging to two genera Howardula and Parasitylenchus.
Highlights
Anguillonema amolensis n. sp. is described and illustrated based on its morphological, morphometric, and molecular characters
In our samplings from several ports of northern forests of Iran, a population belonging to the genus Anguillonema was recovered from rotten wood of a dead trunk of a forest tree
Characters n L L9 a b c c9 V V9 Head height Head width DGO Stylet Conus Excretory pore Pharyngo-intestinal junction to anterior end Pharyngo intestinal junction to end of glands Head-vulva Mid-body width Body width at vulva Anal body width Tail conus as long as the shaft or slightly shorter, small knobs distinct
Summary
Anguillonema amolensis n. sp. is described and illustrated based on its morphological, morphometric, and molecular characters. Andrassy (2007), in his second volume of book series on free-living nematodes of Hungary, proposed a resolved taxonomic position for the genus under the same suborder, Hexatylina, the family Neotylenchidae Thorne, 1941 and subfamily Gymnotylenchinae Siddiqi, 1980. This is one of the rarest nematode genera, with poor data on its morphology; and some details of its body structure such as the nature of pharynx and pharyngo-intestinal junction are not well known due to poor illustrations and/or lacking of other reports or redescriptions (Sumenkova, 1989). The objectives of this work were a morphological study of this rare and poorly known genus and a first molecular phylogenetic study using two genomic fragments
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