A new genus and three new species of Drilonematidae (Rhabditida, Drilonematoidea) from earthworms Author Ivanova, Elena S. Author Hope, Duane text Zootaxa 2009 2293 53 67 journal article 10.5281/zenodo.191461 411b8bea-fab6-44ab-be0c-063b7cbf9edb 1175-5326 191461 Key to the species of Dicelis Dujardin, 1845 1 Egg-shells smooth ........................................................................................................................................................ 3 - Egg-shells ornamented ................................................................................................................................................. 2 2 Caudal organs up to 1/2–2/3 tail diameter, stoma sclerotised ................................................... D. rossica Timm, 1962 - Caudal organs up to 1/4–1/3 tail diameter, stoma not sclerotised ............................................................................... 4 3 Eggs elongated,>60 µm long, 30 µm in diameter ................................................... D. nira Chitwood & Lucker, 1934 - Eggs elliptical, <45–50 µm long, 25–30 µm diameter .......................... D. keimeri Morand, Ivanova & Vaucher, 1996 4 Egg-shells coated with spikes ...................................................................................................................................... 5 - Egg-shells coated with tubercles .................................................................................................................................. 7 5 Tail end gradually tapering, bluntly rounded ............................................................................................................... 6 - Tail end well-tapered with conical terminal tip .................................................................... D. sibirica Ivanova, 1994 6 Eggs broadly elliptical, length 120% of width, <43 µm long; vulva post-median; amphids pore-like ....... D. eiseniae Timm, 1967 - Eggs elongated, length>120% of width,> 62–110 µm long, vulva median; amphids pocket-like ............................... ................................................................................................. D. caledoniensis Spiridonov, Ivanova & Wilson, 2005 7 Caudal organs small, less than 1/4 of tail diameter, situated within posterior third of tail .......................................... 8 - Prominent caudal organs at mid-tail ............................................................................................................................ 9 8 Tip ovary cell near tail tip, no loops of genital tube between anus and spermatheca... D. kimmeriensis Ivanova, 1993 - Tip ovary cell anterior to anus, two loops of genital tube between anus and spermatheca ........................................... ............................................................................................. D. hyrcanus Belostotskaya, Kozodoi & Spiridonov, 1987 9 Tail end well-tapered with conical terminal tip .......................................................................................................... 10 - Tail gradually tapering, bluntly rounded..................................................................................................................... 13 10 Tail broadly conical, fimbriate organs up to 1/3-1/2 of tail diameter ......................................................................... 11 - Tail narrowly conical, fimbriate organs up to 1/4 of tail diameter ....................................................... D. eudrilii sp. n. 11 Egg-shell tubercles 5–12 µm high ............................................... D. ussuriensis Spiridonov, Ivanova & Wilson, 2005 - Egg-shell tubercles 1–6 µm high ................................................................................................................................ 12 12 Chamber of caudal organ twice as large as its external structure; amphids pore-like; caudal papillae enlarged ........... ................................................................................................................................................. D. rubidi Ivanova, 1994 - Chamber of caudal organ smaller than its external structure; amphids pocket-like; caudal papillae small ................... .............................................................................................................................................. D. pereliae Ivanova, 1993 13 Pharynx cylindrical, eggs <50 µm long .................................................................................. D. filaria Dujardin, 1845 - Pharynx with slight basal expansion, eggs> 65 µm long .......................................................................................... 14 14 Lateral fields with 13–15 ridges; spicule body punctated; 9 pairs pre-anal papillae .......... D. lovatiana Ivanova, 1993 - Lateral fields with 5–7 ridges, spicule body smooth, 7 pairs pre-anal papillae ............. D. lumbricicola Ivanova, 1993