Key to the species of Galathea Fabricius, 1793 from Chinese waters

To date, 26 species of the genus Galathea Fabricius, 1793 have been recorded from Chinese waters, including the two new species and the eight newly recorded species herein. The Chinese Galathea species can be distinguished by the following key:

1. Rostrum truncate ....................................................................................................................... G. pilosa De Man, 1888

- Rostrum triangular ........................................................................................................................................................ 2

2. Strong spine on median protogastric region ........................................................................................... G. babai n. sp.

- No spine on median protogastric region ....................................................................................................................... 3

3. Epipods present at least on P1–2 .................................................................................................................................. 4

- Epipods present only on P1 or absent from P1–4......................................................................................................... 6

4. Epigastric spines present .......................................................................................................... G. guttata Osawa, 2004

- Epigastric spines absent ................................................................................................................................................ 5

5. Rostrum broadly elongate; P1 fingers strongly depressed, distally ending in incurved spine, not spooned.................. .................................................................................................................................... G. genkai Miyake & Baba, 1964

- Rostrum sharp triangular; P1 fingers narrow, distally spooned .................................................... G. inflata Potts, 1915

6. Epipods absent from P1–4 ............................................................................................................................................ 7

- Epipods present only on P1 ........................................................................................................................................ 13

7. Epigastric spines absent .............................................................................................................................................. 8

- Epigastric spines present.............................................................................................................................................. 9

8. Carapace with distinct transverse striae; Mxp3 dactylus narrowed distally.. G. rubromaculata Miyake & Baba, 1967

- Carapace without transverse striae other than median one; Mxp3 dactylus truncate... G. k u b o i Miyake & Baba, 1967

9. Well-developed spine on anterior upper margin of the pterygostomial flap near linea anomurica. .............................. .......................................................................................................................................... G. mauritiana Bouvier, 1914

- No spine on anterior upper margin of the pterygostomial flap near linea anomurica ................................................ 10

10. Carapace lateral margin with small but distinct spine between anterolateral spine and anterior cervical groove ......... .......................................................................................................................................... G. consobrina De Man, 1902

- Carapace lateral margin without spine between anterolateral spine and anterior cervical groove............................. 11

11. Second transverse stria of carapace with spine near each hepatic region..................... G. ba lss i Miyake & Baba, 1964

- Second transverse stria of carapace without spines.................................................................................................... 12

12. Basal article of antennular peduncle with 3 well-developed terminal spines......................... G. anepipoda Baba, 1990

- Basal article of antennular peduncle with 2 well-developed terminal spines, distomesial spine reduced to small size. ............................................................................................................................. G. yamashitai Miyake & Baba, 1967

13. Rostrum with 5 teeth on lateral margin ..................................................................................................................... 14

- Rostrum with 4 teeth on lateral margin ...................................................................................................................... 15

14. Carapace with numerous transverse ridges on dorsal surface; P1 at least more than 2 times as long as carapace

including rostrum; P1 fingers distally spooned. .................................................................. G. multilineata Balss, 1913 - Carapace with less numerous transverse ridges on dorsal surface; P1 1.16 times as long as carapace including ros- trum; P1 fingers distally ending in incurved spine .............................................................................. G. sinensis n. sp. 15. Pterygostomian flap with spine on anterior surface.................................................................................................... 16

- Pterygostomian flap without spine on surface............................................................................................................ 18

16. Mxp3 carpus with spines on extensor margin .................................................................. G. orientalis Stimpson, 1858

- Mxp3 carpus without spine on extensor margin ......................................................................................................... 17

17. Carapace with marginal spinule between end of anterior branch of cervical groove and anterolateral spine................ ................................................................................................................................ G. coralliophilus Baba & Oh, 1990

- Carapace without marginal spinule between end of anterior branch of cervical groove and anterolateral spine........... ................................................................................................................................ G. oh sh im a i Miyake & Baba, 1967

18. Epigastric spines absent ............................................................................................................................................. 19

- Epigastric spines present ........................................................................................................................................... 20

19. Uninterrupted stria between anterior-most spines of branchial marginal directed behind anterior cervical groove...... .......................................................................................................................................... G. platycheles Miyake, 1953

- No uninterrupted stria between anterior-most spines of branchial marginal directed behind anterior cervical groove. .......................................................................................................................................... G. ternatensis De Man, 1902

20. Gastric region with extra spines other than pair of epigastric spines ......................................................................... 21

- Gastric region with pair of epigastric spines only....................................................................................................... 23

21. Mxp3 merus unarmed on extensor margin ........................................................................... G. albatrossae Baba, 1988

- Mxp3 merus armed on extensor margin. .................................................................................................................... 22

22. Carapace strongly pubescent; rostrum relatively broad triangular .................................. G. pubescens Stimpson, 1858

- Carapace hardly pubescent; rostrum very narrow triangular...................................... G. inconspicua Henderson, 1885

23. Carapace with uninterrupted transverse stria between anteriormost branchial marginal spines directly behind anterior cervical grooves .................................................................................................. G. aegyptiaca Paul’son, 1875

- Carapace with interrupted stria between anteriormost branchial marginal spines directly behind anterior cervical grooves ........................................................................................................................................................................ 24

24. Mxp3 merus with 3 flexor spines .................................................................. G. whiteleggii Grant & McCulloch, 1906

- Mxp3 merus with 2 flexor spines ............................................................................................................................... 25

25. Hepatic region with 1 or 2 dorsal spines; Mxp3 merus with distal flexor spine subequal to or slightly larger than proximal spine ................................................................................................................... G. spinosorostris Dana, 1852

- Hepatic region without dorsal spine; Mxp3 merus with distal flexor spine distinctly smaller than proximal spine...... .......................................................................................................................................... G. tanegashimae Baba, 1969