Stenothoinae Boeck, 1871

Key to genera of Stenothoinae Boeck, 1871 View in CoL

1. Basis of pereopod 7 rectolinear.......................................................................... 2

– Basis of pereopod 7 expanded.......................................................................... 10

2. Palp of mandible present............................................................................... 3

– Palp of mandible absent................................................................................ 9

3. Palp of mandible 2 or 3-articulate........................................................................ 4

– Palp of mandible 1-articulate............................................................................ 6

4. Gnathopod 1 subchelate.......................................................... Probolisca Gurjanova, 1938 View in CoL

– Gnathopod 1 small, simple.............................................................................. 5

5. Pereonit 4 with dorsal medial keel........................................ Hardametopa Barnard & Karaman, 1991 View in CoL

– Pereonit 4 without dorsal medial keel..................................................... Metopella Sars, 1892 View in CoL

6. Peduncular articles 1 of antenna 1 with nasiform lobe, urosomite 1 carinate dorsally. Zaikometopa Barnard & Karaman, 1987 View in CoL

– Peduncular articles 1 of antenna 1 without nasiform lobe, urosomite 1 smooth –.................................... 7

7. Gnathopod 1 subchelate........................................................ Metopelloides Gurjanova, 1938 View in CoL

– Gnathopod 1 small, simple.............................................................................. 8

8. Merus and carpus of gnathopod 1 short, unlobed............................... Vonimetopa Barnard & Karaman, 1987 View in CoL

– Merus and carpus of gnathopod 1 with long posterodistal lobes............................ Gurjanovometopa gen. nov.

9. Gnathopods 1 and 2 different from each other in size and shape, gnathopod 1 small, simple...................................................................................................... Parametopella Gurjanova, 1938 View in CoL

– Gnathopods 1 and 2 subchelate, similar in size and shape, palm oblique and as long as propodus in Gn1.......................................................................................... Sandrothoe Krapp-Schickel, 2006 View in CoL

10. Palp of mandible present.............................................................................. 11

– Palp of mandible absent............................................................................... 27

11. Palp of mandible 2 or 3-articulate....................................................................... 12

– Palp of mandible 1-articulate........................................................................... 24

12. Antenna 1 bearing nasiform process on peduncular article 1............................ Prometopa Schellenberg, 1926 View in CoL

– Antenna 1 lacking nasiform process on peduncular article 1................................................... 13

13. Accessory flagellum of antenna 1 with 2 articles............................................................ 14

– Accessory flagellum of antenna 1 with 1 article or without.................................................... 17

14. Antenna 1 shorter than antenna 2........................................... Torometopa Barnard & Karaman, 1987 View in CoL

– Antenna 1 subequal or longer than antenna 2.............................................................. 15

15. Antenna 1 subequal to antenna 2 in length........................................... Metopoides Della Valle, 1893 View in CoL

– Antenna 1 longer than antenna 2........................................................................ 16

16. Gnathopods 1, 2 subchelate, different in size and shape...................... Scaphodactylus Rauschert & Andres, 1993 View in CoL

– Gnathopods 1, 2 with relatively small difference in size and shape.................. Ligulodactylus Krapp-Schickel, 2013 View in CoL

17. Pereopod 7 basis posteriorly narrowing................................................................... 18

– Pereopod 7 basis with round posterior margin.............................................................. 19

18. Basis of pereopod 6 rectolinear.............................................. Mesometopa Gurjanova, 1938 View in CoL (part)

– Basis of pereopod 6 rectangularly widened, distally narrowing.................... Malvinometopa Krapp-Schickel, 2011 View in CoL

19. Palp of maxilla 1 2-articulate........................................................................... 20

– Palp of maxilla 1 1-articulate........................................................................... 23

20. Carpus of gnathopod 1 short, shorter than propodus........................... Aurometopa Barnard & Karaman, 1987 View in CoL

– Carpus of gnathopod 1 long, subequal or longer than propodus................................................ 21

21. Antenna 1 shorter than antenna 2............................................. Kyphometopa Krapp-Schickel, 2013 View in CoL

– Antenna 1 subequal to antenna 2 in length................................................................. 22

22. Basis of pereopod 6 not expanded............................................. Mesoproboloides Gurjanova, 1938 View in CoL

– Basis of pereopod 6 expanded.................................................... Proboloides Della Valle, 1893 View in CoL

23. Basis of pereopod 6 rectolinear.............................................. Mesometopa Gurjanova, 1938 View in CoL (part)

– Basis of pereopod 6 expanded, rounded.................................................... Metopa Boeck, 1871 View in CoL

24. Basis of pereopod 6 not expanded.................................................. Stenothoides Chevreux, 1900 View in CoL

– Basis of pereopod 6 expanded.......................................................................... 25

25. Palp of mandible 2-articulate; carpus of gnathopod 1 short, shorter than propodus........... Prostenothoe Gurjanova, 1938 View in CoL

– Palp of mandible 1-articulate; carpus of gnathopod 1 long, subequal or longer than propodus........................ 26

26. Gnathopod 2 slightly enlarged, palm weakly oblique..................................... Stenula J.L. Barnard, 1962 View in CoL

– Gnathopod 2 strongly enlarged, palm almost vertical, posterior margin very short....... Victometopa Krapp-Schickel, 2011 View in CoL

27. Pereopod 5 with rectangular weakly expanded basis................................... Goratelson J.L. Barnard, 1972 View in CoL

– Pereopod 5 with rectolinear basis........................................................................ 28

28. Inner plate of maxilla 2 ordinary, produced................................................................ 29

– Inner plate of maxilla 2 unproduced...................................................................... 31

29. Gnathopod 1 small, simple, dactyl short and stubby................................. Wallametopa J.L. Barnard, 1974 View in CoL

– Gnathopod 1 subchelate, dactylus thin.................................................................... 30

30. Gnathopod 2 extremely large, palm strongly oblique.......................... Knysmetopa Barnard & Karaman, 1987 View in CoL

– Gnathopod 2 slightly enlarged, palm almost transvers................................... Parametopa Chevreux, 1901 View in CoL

31. Rostrum about as long as head, acute.............................................. Synkope Krapp-Schickel, 1999 View in CoL

– Head without distinct rostrum, truncate.................................................... Stenothoe Dana, 1852 View in CoL