Canthocamptus Westwood 1836
Creators: name: Novikov, Aleksandr
name: Sharafutdinova, Dayana
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Hexanauplia
Harpacticoida
Canthocamptidae
Canthocamptus

description: Key to the species of Canthocamptus for males (female characters indicated by asterisk)
1. Mandibular palp with 3 setae ..................................................................... C. kunzi Apostolov, 1969
– Mandibular palp with 5 setae............................................................................................................ 2
2. P4 Enp2 with normal outer spine ...................................................................................................... 3
– P4 Enp2 with modified finger-like outer spine ................................................................................. 6
3. Habitus wide; P1 Enp1 reaching end of Exp2; anal somite with ventral processes ......................... 4
– Habitus sub-cylindrical; P1 Enp1 reaching middle of Exp3; anal somite without ventral processes ........................................................................................................................................................... 5
4. P5 eXopod with 6 setae; *caudal rami seta V of female conical ......................................................... ..................................................................................................... C. verestschagini (Borutzky, 1931)
– P5 eXopod with 5 setae; *caudal rami seta V of female long, normal ................................................ ......................................................................................................... C. longifurcatus Borutzky, 1947
5. *Caudal rami seta IV of female normal ........................................................ C. latus Borutzky, 1947
– *Caudal rami seta IV of female sickle-like, with bulb ............................ C. bulbifer Borutzky, 1947
6. Anal somite with unguiform processes ............................................................................................. 7
– Anal somite without processes ....................................................................................................... 12
7. P3 Enp3 with 2 normal setae ............................................................................................................ 8
– P3 Enp3 with vestigial or without setae ........................................................................................... 9
8. Caudal rami setae IV and V with ʻhelle Stelleʼ ........................... C. oregonensis M.S. Wilson, 1956
– Caudal rami setae IV and V without ʻhelle Stelleʼ .............................. C. staphylinus (Jurine, 1820)
9. P4 Enp2 with 2 normal inner setae ................................................................................................. 10
– P4 Enp2 with 2 vestigial or without inner setae ..............................................................................11
10. Caudal rami without inner spinules; *P5 eXopod of female without inner spinules .......................... ................................................................................................ C. microstaphylinus s. str. Wolf, 1905
– Caudal rami with inner spinules; *P5 eXopod of female with inner spinules .................................... ............................................................................................ C. microstaphylinus monardi Roy, 1927
11. Distal edge of caudal rami with spinules ............. C. macrosetifer Ishida in Ishida & Kikuchi, 1999
– Distal edge of caudal rami without spinules ........ C. takkobuensis Ishida in Ishida & Kikuchi, 1999
12. P2 Enp2 with 5 setae ....................................................................................................................... 13
– P2 Enp2 with 4 setae ....................................................................................................................... 19
13. P3 Enp3 with vestigial seta ............................................................................................................. 14
– P3 Enp3 with 2 normal setae .......................................................................................................... 15
14. Caudal rami with inner spinules; *P3 Enp3 of females with 5 setae .................................................. .............................................................................. C. kitaurensis Kikuchi in Ishida & Kikuchi, 1999
– Caudal rami without inner spinules; *P3 Enp3 of females with 4 setae ............................................ ......................................................................................................... C. carinatus Shen & Sung, 1973
15. P5 endopod inner seta/outer seta length>5 .................................................... C. sinuus Coker, 1934
– P5 endopod inner seta/outer seta length <5 .................................................................................... 16
16. Anal operculum naked ........................................................................... C. glacialis Lilljeborg, 1902
– Anal operculum spinulose .............................................................................................................. 17
17. Caudal rami short (length to width ratio = 2) ..................................... C. baikalensis Borutzky, 1931
– Caudal rami long (length to width ratio = 2.5) ............................................................................... 18
18. Caudal rami seta V with ʻhelle Stelleʼ ...................................................... C. iaponicus Brehm, 1927
– Caudal rami seta V without ʻhelle Stelleʼ .......................................... C. staphylinoides Pearse, 1905
19. Caudal rami very long (length to width ratio>3.5) .................... C. robertcokeri M.S. Wilson, 1958
– Caudal rami of normal length (length to width ratio <3) ................................................................ 20
20. Caudal rami with inner spinules; *P5 eXopod of females with inner spinules ................................... ......................................................................................................................... C. sinuus Coker, 1934
– Caudal rami without inner spinules; *P5 eXopod of females without inner spinules ..................... 21
21. Spinular row of penultimate somite with gap; *caudal rami seta V of female without bulb ............. ...................................................................................................................... C. assimilis Kiefer, 1931
– Penultimate somite with circumsomitic spinular row; *caudal rami seta V of female with bulb ....... .......................................................................................................... C. waldemarschneideri sp. nov.
description: Published as part of Novikov, Aleksandr & Sharafutdinova, Dayana, 2022, Revision of the genus Canthocamptus (Copepoda: Harpacticoida) with a description of a new species from the Lena River Delta (North-eastern Siberia), pp. 33-63 in European Journal of Taxonomy 826 (1) on pages 57-58, DOI: 10.5852/ejt.2022.826.1833, http://zenodo.org/record/6761616