Dorylaimopsis Ditlevsen, 1918

Hong, Jung-Ho, Kim, Hyeonggeun, Kim, Kichoon, Lee, Seunghan & Lee, Kanghyun Lee and Wonchoel, 2023, Two unrecorded species of the family Comesomatidae Filipjev, 1918 (Nematoda: Araeolaimida) from Korea, Journal of Species Research 12 (2), pp. 122-149 : 132-133

Key to the genus Dorylaimopsis Ditlevsen, 1918

(amended from Jensen, 1979; Zhang, 1992,

Leduc, 2012 and Fu et al., 2018)

1. Lateral differentiation of cuticle changes within one species, cuticle with four longitudinal rows of coarse dots in pharynx and mid body or entire body, or with irregularly distributed dots ····················· D. communis - Cuticle with longitudinal rows of dots in part or over entire body································································ 2 2. Cuticle with lateral longitudinal rows of coarse dots along part of body length ·········································· 3

- Cuticle with longitudinal rows of dots along entire length of body··························································· 5

3. Lateral longitudinal rows of coarse dots present posterior to pharyngeal region only ···································· 4

- Lateral longitudinal rows of coarse dots present in two regions, one is from posterior edge of amphid to anterior of intestine region, the other is tail region in males ···································································· D. jinyuei

4. Lateral differentiation of cuticle consisting of 1-3 longitudinal rows of dots beginning posterior to pharynx, gubernaculum with swollen distal end ··············· ································································ D. coomansi

- Lateral differentiation of cuticle consisting of 3-5 longitudinal rows of dots beginning posterior to pharynx, triangular gubernaculum tapering distally ·········· ···································································· D. turneri

5. Cuticle laterally with two longitudinal rows of coarse dots in middle body region of both sexes·················· 6

- Cuticle laterally with more than two longitudinal rows of coarse dots in at least one of the sexes ················ 19

6. Lateral differentiation of cuticle narrower than 0.2 corresponding body diameter···································· 7

- Lateral differentiation wider than 0.2 corresponding body diameter ························································· 11

7. Spicules with ventral projection·············· D. punctata

- Spicules without ventral projection·························· 8

8. Precloacal supplements absent································· 9

- Precloacal supplements present ····························· 10

9. Long spicules (149-162 μm)················ D. intermedia

- Short spicules (59-68 μm)··············· D. brevispiculata

10. Body length>2.0 mm, spicules length>100 μm ······ ···································································· D. papilla

- Body length<2.0 mm, spicules length<100 μm ······ ································································· D. rabalaisi

11. Spicules jointed, with ventral projection, or simple····· ················································································ 12

- Spicules jointed and irregularly cuticularized·············· ·························································· D. mediterranea

12. Spicules jointed, with two equal segments, precloacal supplements absent ··································· D. perfecta

- Spicules jointed, precloacal supplements present ········ ···································································· D. tumida

- Spicules otherwise ·················································· 13

13. Spicules without distal hooks or projections ··········· 14

- Spicules with distal hooks or ventral projections····· 18

14. Gubernaculum with irregular base; gubernacular apophyses with blunt distal end ····························· D. nini

- Gubernaculum with smooth base; gubernacular apophyses with pointed or rounded distal end ·············· 15

15. Gubernaculum with pointed end···························· 16

- Gubernaculum with rounded end··························· 17

16. Spicules elongated, slightly arcuate at the border of spicules and gubernaculums ··············· D. longispicula

- Spicules arcuate····································· D. peculiaris

17. Male body length<2100 μm, spicules with poorly developed capitulum, spicule length 1.7-1.9 cloacal body diameters ···················································· D. gerardi

- Male body length>2100 μm, spicules with well-devel- oped capitulum, spicule length 1.8-2.4 cloacal body diameters ················································ D. variabilis

18. Spicules with small distal hook············ D. pellucirum

- Spicules with rounded ventral projection at one third of spicule length from distal end ················ D. nodderi

19. Cuticle with two rows of coarse dots in males and three in females ······························································· 20

- Cuticle with more than two rows of coarse dots in males······································································· 21

20. Spicules distally acute··························· D. poriferum

- Spicules distally with a subterminal hook ····· D. timmi

21. Cuticle with three rows of coarse dots in middle body region of males ······················································· 22

- Cuticle with four or five rows of coarse dots in middle body region of males··············································· 24

22. Tail without swollen tip and terminal setae ············· 23

- Tail with swollen tip and terminal setae ······ D. janetae

23. Longer tail (369-380 μm), higher value of c′ (11-14) ···························································· D. halongensis

- Shorter tail (158-228 μm), lower value of c′ (5-7) ···· ································································· D. boucheri

24. Spicules without subterminal hook, short cephalic seta, long spicule··················································· D. lutosa

- Spicules without subterminal hook, long cephalic seta, short spicule ·············································· D. angelae

- Spicule with subterminal hook········· D. magellanense