Diplopeltoides, , Gerlach, 1962

Holovachov, Oleksandr & Boström, Sven, 2017, Three new and five known species of Diplopeltoides Gerlach, 1962 (Nematoda, Diplopeltoididae) from Sweden, and a revision of the genus, European Journal of Taxonomy 369, pp. 1-35 : 29-30

Key to species of Diplopeltoides

See Table 7 for additional diagnostic characters.

1. Body shorter than 0.7 mm; testes opposed ...................................................................................... 2

– Body longer than 0.8 mm; testes outstretched ................................................................................. 4

2. Cuticularised plate present; annulation starts at the posterior ¼ th of amphid .................................. 3

– Cuticularised plate absent; annulation starts at the anterior ¼ th of amphid ........................................ ........................................................................... D. pumilus ( Vincx & Gourbault, 1992) comb. nov.

3. Spicules 22 µm long; gubernaculum triangular ...................................... D. ornatus ( Gerlach, 1950)

– Spicules 29–36 µm long; gubernaculum plate-like ........................................ D. linkei Jensen, 1991

4. Cuticlar annules with londitudinal striation distinctly visible under the light microscope ............. 5

– Cuticular annules visually smooth under light microscope, longitudinal striation may be visible under scanning electron microscope ................................................................................................ 9

5. Cuticularised plate present ............................................................................................................... 6

– Cuticularised plate absent ................................................................................................................ 7

6. Amphid hook-shaped .......................................................................................................................... ............. D. axayacatli Holovachov, Tandingan De Ley, Mundo-Ocampo, Gingold & De Ley, 2009

– Amphid an inverted U-shaped ............................................................................. D. grandis sp. nov.

7. Interamphideal shield crenate ............................................................................................................. ........... D. santaclarae Holovachov, Tandingan De Ley, Mundo-Ocampo, Gingold & De Ley, 2009

– Interamphideal shield smooth .......................................................................................................... 8

8. Body 1.7 mm long; spicules 17 µm long ............................. D. striatus ( Gerlach, 1956) comb. nov.

– Body 1.0– 1.2 mm long; spicules 25 µm long ...................... D. pulcher ( Vincx & Gourbault, 1992)

9. Amphidial fovea with fine transverse striation ................... D. bulbosus ( Vitiello, 1972) comb. nov.

– Amphidial fovea without fine transverse striation ......................................................................... 10

10. Cuticular plate present .................................................................................................................... 11

– Cuticular plate absent .................................................................................................................... 12

11. Cephalic setae 4–6 µm long; amphid 14–21 µm long; precloacal ridge absent ................................. ............................................................................................................................ D. suecicus sp. nov.

– Cephalic setae 13 µm long; amphid 6 µm long; precloacal ridge present .......................................... ................................................................................................................... D. longicaudatus sp. nov.

12. Amphid with wide interamphideal area ......................................................................................... 13

– Amphid with narrow interamphideal area ..................................................................................... 16

13. Interamphideal area smooth, without ornamentation .................................................................... 14

– Interamphideal area punctated, areolated or crenated ................................................................... 15

14. Cephalic setae 17 µm long ..................................................... D. botulus (Wieser, 1959) comb. nov.

– Cephalic setae 5 µm long ...................................................................... D. sundensis ( Jensen, 1978)

15. Cephalic setae 12–18 µm long; amphid 21–26 µm long .................................................................... ........ D. paramastigia Holovachov, Tandingan De Ley, Mundo-Ocampo, Gingold & De Ley, 2009

– Cephalic setae 6.5–8.5 µm long; amphid 40–45 µm long ................... D. mastigia Tchesunov, 1990

16. Cephalic setae longer than 10 µm ............... D. lucanicus (Boucher & Helléouët, 1977) comb. nov.

– Cephalic setae shorter than 10 µm ................................................................................................. 17

17. Cephalic setae 3.5–7 µm long ................................................ D. asetosus (Juario, 1974) comb. nov.

– Cephalic setae less than 1–2 µm long ............................................................................................ 18

18. Spicules with dorsally bent manubrium; amphid 17–28 µm long ...................................................... ................................................................................................................... D. nudus ( Gerlach, 1956)

– Spicules with straight manubrium; amphid 26–33 µm long ............................................................... ................................................................................................................ D. anatolii (Voronov, 1982)