Paramonohystera Steiner 1916
Creators: name: Zhai, Hongxiu
name: Geng, Chunxiao
name: Sun, Jun
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Monhysterida
Monhysteridae
Paramonohystera

description: Updated key for valid species of Paramonohystera (based on Yu & Xu, 2015)
1. Spicules equal or shorter than 40 µm long (s′<2.1)........................................................... 2
- Spicules more than 50 µm long (s′>2.1).................................................................... 3
2. a=36–46, cervical setae absent, spicules 26–27 µm long............................................ P. brevicaudata
- a=20–22, cervical setae 13–15µm long, spicules 38–40 µm long......................................... P. biforma
3. Spicules shorter than 60µm long......................................................................... 4
- Spicules more than 60µm long........................................................................... 6
4. a=21.9, c′=7.2............................................................................ P. parabutschlii
- a>50, c′=7–15 ........................................................................................ 5
5. Tail conico-cylindrical, c′<12, spicules present dilation distally......................................... P. riemanni
- Tail filiform, c′>14, spicules do not present dilation distally..................................... P. gracilis sp. nov.
6. Spicules shorter than 100µm long........................................................................ 7 - Spicules more than 100µm long......................................................................... 11
7. Cephalic setae segmented, s′=2.8................................................................. P. concinna
- Cephalic setae not segmented............................................................................ 8
8. Head diameter smaller than 10 µm long, s′=2.1........................................................ P. zizichi
- Head diameter more than 10 µm long, s′=2.7–4.4............................................................ 9
9. Head diameter 27–35 µm long, s′=2.7........................................................... P. weihaiensis
- Head diameter smaller than 20 µm long.................................................................. 10
10. 12 cephalic setae, s′=4.0–4.4...................................................................... P. sinica
- 10 cephalic setae, s′=3.4......................................................................... P. levicula
11. 12 cephalic setae, s′<3................................................................................ 12
- 10 cephalic setae, s′>3................................................................................ 14
12. Head diameter 9–12 µm, spicules 105–113 µm long................................................... P. halerba
- Head diameter more than 30 µm long.................................................................... 13
13. Spicules 113 µm long, gubernaculum with distal hooks.............................................. P. buetschlii
- Spicules 167 µm long, gubernaculum without distal hooks............................................... P. pilosa
14. Head diameter more than 24 µm long, s′<4................................................................ 15
- Head diameter smaller than 20 µm long, s′>5.............................................................. 16
15. Spicules more than 140 µm long, precloacal supplements present................................... P. eurycephalus
- Spicules shorter than 130 µm long, precloacal supplements absent....................................... P. proteus
16. Precloacal supplements present, spicules 108–116 µm long............................................. P. geraerti
- Precloacal supplements absent, spicules more than 190 µm long.................................... P. megacephala
description: Published as part of Zhai, Hongxiu, Geng, Chunxiao & Sun, Jun, 2022, Two new species of Xyalidae (Nematoda: Monhysterida) from intertidal zone of the Bohai Sea, China, pp. 133-144 in Zootaxa 5222 (2) on pages 138-139, DOI: 10.11646/zootaxa.5222.2.2, http://zenodo.org/record/7456553