Pomponema Cobb, 1917

Cidreira, Gabriel, Pinheiro-Junior, Eraldo P., Venekey, Virág & De Souza Alves, Orane F., 2019, A new species of Pomponema Cobb, 1917 (Nematoda: Cyatholaimidae) from Northeast of Brazil, with reference to the taxonomic status of the genera Parapomponema Ott, 1972 and Propomponema Ott, 1972, Zootaxa 4691 (1), pp. 63-77 : 74-75

Key to species of Pomponema Cobb, 1917

Adapted from Huang & Zhang (2014)

1 Lateral differentiation of cuticle absent (or except tail region).................................................. 2 - Lateral differentiation of cuticle present................................................................... 6 2 Tail longer than 12 anal body diameters with 4/5 of the posterior portion filiform........ P. websteri Sharma & Vincx, 1982 - Tail shorter than 6 anal body diameters.................................................................... 3 3 Tail conical; 13 rectangular precloacal supplements..................................... P. golikovi Platonova, 1988 - Tail conico-cylindrical................................................................................. 4 4 26 –29 precloacal supplements......................................................... P. syltense Blome, 1974 - Less than 20 precloacal supplements...................................................................... 5 5 Inner labial setae 5–6 μm long; amphids diameter <50% of the corresponding body diameter...... P. foeticolum ( Ott, 1972) - Inner labial setae 1–5 μm long; amphids diameter> 60% of the corresponding body diameter..... P. tautraense Allgén, 1933 6 Amphid located at apical surface of the head................................................................ 7 - Amphid posterior to midlevel of buccal cavity.............................................................. 9 7 Lateral differentiation of dots without transverse bars; 20 precloacal supplements.......... P. corniculata Gourbault, 1980 - Lateral differentiation of dots with transverse bars........................................................... 8 8 15 –19 complex precloacal supplements; tail 3.7–4.5 anal body diameters................ P. multipapillatum Filipjev, 1922 - 13–14 papillose precloacal supplements; tail 7.5–8.1 anal body diameters............ P. proximamphidum Tchesunov, 2008

9 Lateral differentiation of dots irregular, not in longitudinal rows........................ P. ammophilum Lorenzen, 1972

- Lateral differentiation of dots in longitudinal rows.......................................................... 10

10 Lateral differentiation with three longitudinal rows of dots.................................................... 11

- Lateral differentiation with two or four longitudinal rows of dots............................................... 13

11 72 or more tubular precloacal supplements; tail with 1/3 of the posterior portion cylindrical............................................................................................ P. multisupplementa Huang & Zhang, 2014

- Less than 72 precloacal supplements..................................................................... 12

12 11 precloacal supplements; tail with 2/3 of the posterior portion cylindrical.................. P. astrodes Lorenzen, 1972

- 2 preclocal supplements; spiral amphids with 5 1/3 turns................................... P. coomansi Vincx, 1981

13 Lateral differentiation with two longitudinal rows of dots..................................................... 14

- Lateral differentiation with four or more longitudinal rows of dots.............................................. 23

14 Gubernaculum with L-shaped lateral plates................................................................ 15

- Gubernaculum without L-shaped lateral plates............................................................. 17

15 18 precloacal supplements......................................................... P. macrospirale ( Ott, 1972)

- More than 18 precloacal supplements.................................................................... 16

16 Buccal cavity without denticles........................................................ P. hastatum ( Ott, 1972)

- Buccal cavity with denticles................................................................ P. veronicae sp. n.

17 Lateral differentiation of dots with transverse bars.......................................................... 18

- Lateral differentiation of dots without transverse bars........................................................ 19

18 Amphids with 3.5 turns; precloacal supplements complex.................................... P. sedecima Platt, 1973

- Amphids with 10 turns; precloacal supplements cup-shaped................................. P. koesterae Jensen, 1992

19 Two rows of lateral dots originated in the base of neck; spicules slender; 20 precloacal supplements.................................................................................................... P. concinnum wieser, 1954

- Two rows of lateral dots originated in the anterior region of neck............................................... 20

20 Length of inner labial setae almost equal to cephalic setae.................................... P. mirabile Cobb, 1917

- Inner labial setae 30% longer than cephalic setae........................................................... 21

21 9 precloacal supplements.......................................................... P. segregatum wieser, 1959

- 19–23 precloacal supplements.......................................................................... 22

22 Spicules 2 anal body diameters long.................................................... P. litorium ( Cobb, 1920)

- Spicules 1 anal body diameter long................................................... P. loticum Lorenzen, 1972

23 Without outer labial setae; 15 precloacal supplements.................................. P. cotylophorum Steiner, 1916

- With outer labial setae................................................................................ 24

24 Only six outer labial setae; without four cephalic setae....................................................... 25

- Six outer labial setae and four cephalic setae in one circle.................................................... 28

25 20–24 precloacal supplements...................................................... P. reductum warwick, 1970

- 11–18 precloacal supplements.......................................................................... 26

26 Inner labial setae 6–9 μm long.................................................... P. compactum Lorenzen, 1972

- Inner labial setae 3–4 μm long.......................................................................... 27

27 12–15 precloacal supplements; tail longer than 125 μm................................... P. elegans Lorenzen, 1972

- 15–18 precloacal supplements; tail shorter than 110 μm.................................... P. debile Lorenzen, 1972

28 Four cephalic setae equal to 50% of labial setae in length; more than 20 precloacal supplements...................... 29

- Four cephalic setae equal to 85% of labial setae in length; less than 15 precloacal supplements....................... 31

29 Four cephalic setae only 17% of labial setae in length; 23 precloacal supplements.............. P. stomachor wieser, 1954

- Four cephalic setae longer than 40% of the six labial setae in length............................................ 30

30 Width of lateral differentiation equal to 60% of the corresponding body diameter; 20–22 precloacal supplements.................................................................................. P. clavicaudatum Stekhoven, 1935

- Width of lateral differentiation equal to 30% of the corresponding body diameter; 24 precloacal supplements............. P............................................................................. .. polydontus Murphy, 1963

31 Labial setae almost equal to cephalic setae in length; 15 precloacal supplements....... P. tesselatum wieser & Hopper, 1967

- Labial setae shorter than 30% of cephalic setae in length; 1 precloacal supplement.............. P. lineatum Gerlach, 1953