Pontonema Leidy 1855
Creators: name: Villares, Gabriela
name: Russo, Virginia Lo
name: Pastor, Catalina
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Enoplida
Oncholaimidae
Pontonema

description: Key for identification of males of Pontonema Leidy, 1855
1 With precloacal sensory field............................................................................ 2
- Without precloacal sensory field.........................................................................14
2 With one precloacal field................................................................................ 3
- With more than one precloacal field....................................................................... 7
3 Excretory pore at more than one buccal length from anterior end................................................ 5
- Excretory pore at the base of the buccal cavity............................................................... 4
4 Four papilliform sensillae......................................................................... P. cobbi
- Seven papilliform sensillae.......................................................... P. golfonuevensis sp. nov.
5 Value of c' less than 3.0........................................................................ P. incisum
- Value of c' equal or more than 3.0......................................................................... 6
6 Presence of ocellus.......................................................................... P. ocellatum
- Absence of ocellus....................................................................... P. paraocellatum
7 Anterior precloacal sensory field distant from proximal end of spicules........................................... 8
- Anterior precloacal sensory field close to proximal end of spicules.............................................. 10
8 Papillae postcloacal present.................................................................... P. balticum
- Papillae postcloacal absent.............................................................................. 9
9 Gubernaculum with one piece.................................................................. P. vacillatum
- Gubernaculum with three pieces................................................................... P. v u l g a re
10 With supplementary organ at centre of anterior precloacal sensory field................................... P. zernovi
- Without supplementary organ at centre of anterior precloacal sensory field....................................... 11
11 Two precloacal sensory fields........................................................................... 12
- More than two precloacal sensory fields................................................................... 16
12 With conspicuous distal tooth on gubernaculum........................................................ P. simile
- Without tooth on gubernaculum......................................................................... 13
13 Spicules with a fine ala, or wing, along interior edge............................................... P. alaeospicula
- Spicules without ala or wing................................................................. P. macrolaimus
14 With narrow processes extending anteriorly from each tooth............................................. P. subtilis
- Without narrow processes extending anterior from each tooth.................................................. 15
15 Length of the body less than 3.0 mm.............................................................. .. P. ardens
- Length of the body more than 3.00 mm......................................................................................... P. serradentatum (7.1–10.6mm); P. yaenae (6.0–7.0 mm); P. hackingi (11.3mm); P. parvum (3.5mm)
16 Three precloacal sensory fields, with one located between cloaca and proximal end of spicules...................... 17
- Three precloacal sensory fields anterior to proximal end of spicules............................................. 20
17 Second precloacal sensory field close to proximal end of spicules.............................................. 18
- Second precloacal sensory field distant from proximal end of spicules........................................... 19
18 Highly curved, J-shaped spicules............................................................. P. multisetosum
- Spicules arcuate......................................................................... P. parpailleferum
19 Length of the body more than 12.0mm......................................................... P. mediterranea
- Length of the body 7.5–8.3mm ............................................................... problematicum
20 Three precloacal sensory fields present............................................................ P. arcticum
- More than three precloacal sensory fields present...........................................................21
21 Four precloacal sensory fields present........................ P. brevicaudatoides (15–17mm), P. ditlevseni (11–20mm)
- Four to six precloacal sensory fields present.................................................... P. papilliferum
description: Published as part of Villares, Gabriela, Russo, Virginia Lo & Pastor, Catalina, 2015, A new species of Pontonema (Oncholaimidae, Nematoda) and a redescription of Pontonema incisum Wieser, 1953 from Santa Cruz and Chubut Provinces, Argentina, pp. 417-428 in Zootaxa 4058 (3) on page 427, DOI: 10.11646/zootaxa.4058.3.8, http://zenodo.org/record/234546