taxonID	type	description	language	source
BC4C186D9A51B77AFF17FE3C469ECA3F.taxon	description	Several moss samples were collected from a few habitats and localities of Siahkal forests, located in Gilan province, northern Iran. The samples were cut into smaller pieces for nematode extraction. Nematodes were extracted using the tray method (Whitehead and Hemming 1965), handpicked under a stereomicroscope, killed by adding hot FPG (4: 1: 1 formaldehyde: propionic acid: glycerine) solution, transferred to anhydrous glycerine according to De Grisse (1969), and mounted on permanent glass slides to be observed under light microscopy. Specimens were examined using a Nikon Eclipse 80 i light microscope provided with differential interference contrast (DIC) optics, a Nikon Digital Sight DS-U 1 camera and a drawing tube. Raw photographs were edited using Adobe ® Photoshop ® CS. Morphometrics include Demanian indices and other measurements and ratios; the most relevant of them are presented in a separate table, while others appear to form part of the literal description of the species. The female holotype and paratypes are deposited in the Nematode Collections of Universidad de Jaén, Spain, and University of Zanjan, Iran. Please refer to the ‘ Type material’ section for more details.	en	Asgari, Mohsen, Mokhtari, Somayeh, Eskandari, Ali, Peña-Santiago, Reyes (2025): Description and molecular characterisation of Aquatides caelibis sp. n. (Dorylaimida: Nygolaimidae) from Iran, with updated taxonomy of the genus and new insights into its evolutionary relationships. Journal of Natural History 59 (25 - 28): 1877-1893, DOI: 10.1080/00222933.2025.2501394, URL: https://doi.org/10.1080/00222933.2025.2501394
BC4C186D9A52B779FEE1FAAD475ACBA5.taxon	description	(Figures 1 and 2, Table 1)	en	Asgari, Mohsen, Mokhtari, Somayeh, Eskandari, Ali, Peña-Santiago, Reyes (2025): Description and molecular characterisation of Aquatides caelibis sp. n. (Dorylaimida: Nygolaimidae) from Iran, with updated taxonomy of the genus and new insights into its evolutionary relationships. Journal of Natural History 59 (25 - 28): 1877-1893, DOI: 10.1080/00222933.2025.2501394, URL: https://doi.org/10.1080/00222933.2025.2501394
BC4C186D9A57B773FF1DFCE5459BCA70.taxon	diagnosis	Diagnosis Nygolaimidae, Nygolaiminae. Small- to large-sized nematodes, 0.7 – 3.7 mm long. Cuticle dorylaimoid. Lip region continuous with the adjoining body (but very exceptionally offset), often asymmetrical, truncate or somewhat cap-like, with fused lips and low papillae. Amphid fovea cup-like, its aperture barely less than one-half of the lip region diameter. Mural tooth linear, about as long as lip region diameter. Guiding ring weak, plicate. Pharynx entirely muscular, enlarging gradually, the basal expansion surrounded by a weak but perceptible sheath and often occupying more than half (up to three-fifths) of neck length. Cardiac cells conspicuous, rounded to ovoid. Female genital system diovarian, with simple uterus, absence of pars refringens vaginae and transverse vulva. Tail similar in both sexes, convexconoid to nearly hemispheroid. Most species bisexual. Spicules dorylaimid. Gubernaculum present. Ventromedian supplements 2 – 7 in number, irregularly spaced, with hiatus.	en	Asgari, Mohsen, Mokhtari, Somayeh, Eskandari, Ali, Peña-Santiago, Reyes (2025): Description and molecular characterisation of Aquatides caelibis sp. n. (Dorylaimida: Nygolaimidae) from Iran, with updated taxonomy of the genus and new insights into its evolutionary relationships. Journal of Natural History 59 (25 - 28): 1877-1893, DOI: 10.1080/00222933.2025.2501394, URL: https://doi.org/10.1080/00222933.2025.2501394
BC4C186D9A57B773FF1DFCE5459BCA70.taxon	etymology	Etymology The genus name derives from that of its type species, A. aquaticus.	en	Asgari, Mohsen, Mokhtari, Somayeh, Eskandari, Ali, Peña-Santiago, Reyes (2025): Description and molecular characterisation of Aquatides caelibis sp. n. (Dorylaimida: Nygolaimidae) from Iran, with updated taxonomy of the genus and new insights into its evolutionary relationships. Journal of Natural History 59 (25 - 28): 1877-1893, DOI: 10.1080/00222933.2025.2501394, URL: https://doi.org/10.1080/00222933.2025.2501394
BC4C186D9A57B773FF1DFCE5459BCA70.taxon	type_taxon	Type species A. aquaticus (Thorne, 1930) Heyns 1968	en	Asgari, Mohsen, Mokhtari, Somayeh, Eskandari, Ali, Peña-Santiago, Reyes (2025): Description and molecular characterisation of Aquatides caelibis sp. n. (Dorylaimida: Nygolaimidae) from Iran, with updated taxonomy of the genus and new insights into its evolutionary relationships. Journal of Natural History 59 (25 - 28): 1877-1893, DOI: 10.1080/00222933.2025.2501394, URL: https://doi.org/10.1080/00222933.2025.2501394
BC4C186D9A57B773FF1DFCE5459BCA70.taxon	description	= Nygolaimus (Aquatides) aquaticus Heyns A. christicki Ahmad and Jairajpuri A. coboi De Ley and Coomans A. deconincki Jairajpuri and Coomans A. heynsi Gusakov and Gagarin A. ibericus Jiménez-Guirado, Castro-Alhama and Murillo-Navarro A. intermedius (de Man) Heyns = Dorylaimus intermedius de Man = Eudorylaimus intermedius (de Man) Andrássy = Nygolaimus intermedius (de Man) Loof = Nygolaimus (Aquatides) intermedius de Man (Heyns) A. minutus Dhanam, Jairajpuri and Sredharam A. shadini (Filipjev) Heyns = Nygolaimus shadini Filipjev = Nygolaimus (Aquatides) shadini Filipjev; (Heyns) A. smoliki Thorne A. thornei (Schneider) Heyns = Nygolaimus thornei Schneider = Nygolaimus (Aquatides) thornei Schneider (Heyns) Species incertae sedis: A. frigidus (Steiner) Andrássy = Dorylaimus frigidus Steiner = Eudorylaimus frigidus (Steiner) Andrássy A. kaburakii (Imamura) Heyns = Nygolaimus kaburakii Imamura = Nygolaimus (Aquatides) kaburakii Imamura (Heyns) A. rotundicaudatus Thorne	en	Asgari, Mohsen, Mokhtari, Somayeh, Eskandari, Ali, Peña-Santiago, Reyes (2025): Description and molecular characterisation of Aquatides caelibis sp. n. (Dorylaimida: Nygolaimidae) from Iran, with updated taxonomy of the genus and new insights into its evolutionary relationships. Journal of Natural History 59 (25 - 28): 1877-1893, DOI: 10.1080/00222933.2025.2501394, URL: https://doi.org/10.1080/00222933.2025.2501394
