Identification key to the species of Lobella

1 An additional sensory chaeta present on tubercle L of Abd. IV................................................. 2

- An additional sensory chaeta absent on tubercle L of Abd. IV................................................. 12

2 Tubercle De fused to tubercle Dl on Abd. V ................................................................ 3

- Tubercle De separated from tubercle Dl on Abd. V .......................................................... 4

3 Tubercle De of Abd. V with 5–6 chaetae. De of Abd. I– III with 2+s chaetae............ L. wayang Yosii, 1976 (Indonesia)

- Tubercle De of Abd. V with 3 chaetae. De of Abd. I– III with 3+s chaetae................................................................................................... L. kemiri Suhardjono & Deharveng, 2001 (Indonesia)

4 Tubercle Di of Th. II and III with 3 chaetae................................................................ 5

- Tubercle Di of Th. II and III with 2 chaetae................................................................ 8

5 Cephalic O chaeta absent.............................................. L. sandakanensis Yoshii, 1981 (Malaysia)

- Cephalic O chaeta present.............................................................................. 6

6 Tubercle Di of Abd. V with 3 chaetae, including 2 microchaetae................................................ 7

- Tubercle Di of Abd. V with 3 chaetae, including 1 microchaeta............................ L. lucifera sp. nov. (Japan)

7 Tubercle Oc of the head with 1 macrochaeta and 2 mesochaetae; the two mesochaetae longer than the diameter of the ocellus........................................................................... L. sauteri Börner, 1906 (Japan)

- Tubercle Oc of the head with 1 macrochaeta and 2 microchaetae; the two microchaetae shorter than the diameter of the ocellus....................................................... L. yambaru (Tanaka & Hasegawa, 2010) (Japan)

8 Tubercle De of Th. I with 1 chaeta. Cephalic O chaeta absent................... L. setapauca Gapud, 1970 (Philippines)

- Tubercle De of Th. I with 2 chaetae. Cephalic O chaeta present................................................ 9

9 Tubercle Di of Th. I with 1 chaeta....................................................................... 10

- Tubercle Di of Th. I with 2 chaetae...................................................................... 11

10 Cephalic O chaeta as macrochaeta........................ L. monocincta Cassagnau & Deharveng, 1984 (Philippines)

- Cephalic O chaeta as macrochaeta........................... L. bicincta Cassagnau & Deharveng, 1984 (Philippines)

11 Tubercle L of Abd. V with 4 chaetae......................... L. punctata Cassagnau & Deharveng, 1984 (Philippines)

- Tubercle L of Abd. V with 5 chaetae........................... L. bicolor Cassagnau & Deharveng, 1984 (Philippines)

12 Tubercle De fused to tubercle Dl on Abd. V .................................... L. nana Lee & Kim, 1990 (Taiwan)

- Tubercle De separated from tubercle Dl on Abd. V ......................................................... 13

13 Tubercle Di reduced on Abd. III ................................................ L. decipiens Yosii, 1965 (Japan)

- Tubercle Di developed on Abd. III ...................................................................... 14

14 Tubercle Di reduced on Abd. IV............................................. L. mizunasiana Yosii, 1956 (Japan)

- Tubercle Di developed on Abd. IV....................................................................... 15

15 Cephalic O chaeta absent......................................................... L. stachi Yosii, 1956 (Japan)

- Cephalic O chaeta present............................................................................. 16

16 Chaeta of tubercle Di on Th. I as microchaeta. Microchaeta of tubercle De not shifted between Di and De on Abd. I– III ........................................................... L. sokamensis Deharveng & Weiner, 1984 (North Korea)

- Chaeta of tubercle Di on Th. I as mesochaeta. Microchaeta of tubercle De shifted between Di and De on Abd. I– III ....................................................................... L. monstrum Ohira & Nakamori, 2023 (Japan)