Robertgurneya Apostolov & Marinov 1988

Gómez, Samuel, 2020, A new species of Robertgurneya Apostolov & Marinov, 1988, with an illustrated record of R. rostrata (Gurney, 1927), an amended genus diagnosis and comments on R. soyeri (Apostolov, 1974) and R. spinulosa (Sars, 1911) (Harpacticoida Miraciidae), Zootaxa 4861 (4), pp. 451-485 : 481-482

Key to the species of Robertgurneya Apostolov & Marinov 1988

1a. P2 ENP2 with two inner setae…........................................................................... 2 ( similis -group: R. brevipes , R. diversa , R. falklandiensis , R. hopkinsi , R. remanei , R. similis bulbamphiascoides , R. similis similis , R. simulans , R. smithi )

1b. P2 ENP2 with one inner seta….................................................................................. 10 ( rostrata -group: R. arabica , R. dactylifer , R. dictydiophora , R. ecaudata , R. ilievecensis , R. mexicana sp. nov., R. oligochaeta , R. rostrata ,)

2a. P1 ENP2 without inner seta…................................................................... R. remanei 2b. P1 ENP2 with inner seta….............................................................................. 3

3a. P2 ENP1 without inner armature; P3 ENP3 with four elements; female P5 EXP with five, endopodal lobe with four setae…............................................................................................. R. brevipes

3b. P2 ENP1 with inner armature; P3 ENP3 with five elements; female P5 EXP with six, endopodal lobe with five setae…......... 4 ( R. diversa , R. falklandiensis , R. hopkinsi , R. remanei , R. similis bulbamphiascoides , R. similis similis , R. simulans , R. smithi )

4a. Length:width ratio of caudal rami from dorsal view from 0.8–1.0…..............................................

................................................. 5 ( R. similis bulbamphiascoides , R. similis similis , R. simulans ) 4b. Length:width ratio of caudal rami from dorsal view less than 0.7…... 7 ( R. diversa , R. falklandiensis , R. hopkinsi , R. smithi )

5a. Subdistal outer seta of female P5 EXP short, bulbous…................................. R. similis bulbamphiascoides 5b. Subdistal outer seta of female P5 EXP whip-like….................................. 6 ( R. similis similis , R. simulans )

6a. Male P5 EXP with five setae.............................................................. … R. similis similis 6b. Male P5 EXP with six setae…................................................................... R. simulans

7a. Second antennulary segment two times as long as wide; inner spine of basis of the male P1 reaching tip of exopod, and about three times as long as basis…................................................................ R. falklandiensis

7b. Second antennulary segment less than two times as long as wide; inner spine of basis of the male P1 about two times as long as basis…................................................................. 8 ( R. diversa , R. hopkinsi , R. smithi )

8a. Outermost proximal seta of female P5 EXP about half as long as neighbouring seta; innermost seta of male P5 EXP about half

as long as neighbouring seta; male P1 basis with a conical protuberance at the base of the inner spine…........... R. smithi 8b. These characters not combined.................................................... …9 ( R. diversa , R. hopkinsi )

9a. Outer apical seta of female P5 endopodal lobe about half as long as neighbouring seta; innermost seta of female P5 EXP less than half the length of neighbouring seta…......................................................... R. hopkinsi

9b. Length ratio of outer apical:inner apical seta of female P5 endopodal lobe about 0.8; innermost seta of female P5 EXP about half the length of neighbouring seta.............................................................. … R. diversa

10a. Female P5 endopodal lobe with five setae of which innermost and outermost well-developed….................................................11 ( R. arabica , R. dactylifer , R. dictydiophora , R. ecaudata , R. mexicana sp. nov., R. rostrata )

10b. Female P5 endopodal lobe with four setae of which innermost and outermost very reduced….................................................................................................. 16 ( R. ilievecensis , R. oligochaeta )

11a. P1 ENP2 without inner armature; P3 ENP2 with two inner setae; caudal seta III foliose; male unknown… R. dictydiophora 11b. P1 ENP2 with inner armature; P3 ENP2 with one inner seta; caudal seta III whip-like; male P5 EXP with five or six setae….

....................................... 12 ( R. arabica , R. dactylifer , R. ecaudata , R. mexicana sp. nov., R. rostrata )

12a. Armature formula of P3 ENP3 121 (with four elements); male P5 EXP with five setae, endopodal lobe with one well-developed seta and one small spine…....................................................................... R. arabica

12b. Armature formula of P3 ENP3 221 (with five elements); male P5 EXP with five or six setae, endopodal lobe with two elements….......................................... 13 ( R. dactylifer , R. ecaudata , R. mexicana sp. nov., R. rostrata )

13a. Inner spine of the male P1 basis reaching tip of EXP3; male P5 EXP with five setae….............. R. mexicana sp. nov. 13b. Inner spine of the male P1 basis reaching the middle of ENP1; male P5 EXP with six setae…..........................

.................................................................. 14 ( R. dactylifer , R. ecaudata , R. rostrata )

14a. Male P5 EXP with four inner elements of which two inner subdistal elements reduced to two small spines, and with one apical

and one outer element....................................................................... … R. dactylifer 14b. Male P5 EXP with two inner, one distal, and three outer elements…....................... 15 ( R. ecaudata , R. rostrata )

15a. Female P5 EXP oval, less that two times as long as wide…............................................. R. rostrata 15b. Female P5 EXP elongate, about two times as long as wide...........................................… R. ecaudata

16a. Female P5 EXP oval, less than two times as long as wide, with three outer setae short; outer apical element of female P5 endopodal lobe slightly shorter than inner neighbouring seta........................................ … R. oligochaeta

16b. Female P5 EXP elongate, about two times as long as wide, with three outer setae comparatively well-developed; outer apical seta of female P5 endopodal lobe as long or slightly longer than inner neighbouring seta…................. R. ilievecensis