Travisia species, 1840

Plathong, Jintana, Plathong, Sakanan & Salazar-Vallejo, Sergio I., 2023, Two new species of Travisiidae (Annelida, Sedentaria) from Thailand, Zootaxa 5346 (4), pp. 351-371 : 369

Key to Travisia species of Indo-Pacific Ocean

(Modified from Rizzo & Salazar-Vallejo 2020)

1. Branchiae branched................................................................................... 2

– Branchiae cirriform................................................................................... 3

2. One type of anal cirri with 6–8 short cirri.................................. T. arborifera Fauvel, 1932 ; Indian Ocean

– Two types anal cirri, 6 digitiform alternating with 4 small short cirri... T. satunensis sp. nov.; Andaman coast, Indian Ocean

3. Mid-ventral groove present; first branchiae from chaetiger 2, 21 pairs; posterior lappets poorly developed, conspicuous; pygidium short........................................ T. thailandensis sp. nov.; Gulf of Thailand, Western Pacific

– Mid-ventral groove absent.............................................................................. 4

4. Body with 44–53 chaetigers; posterior parapodia not projected from lobes or lappets; pygidium with 7 anal papillae............................................................................. T. lithophila Kinberg, 1866 ; Australia

– Body with less than 40 chaetigers........................................................................ 5

5. Body with 39–40 chaetigers.................................................. T. japonica Fujiwara, 1933 ; Japan

– Body with 34–35 chaetigers.......... T. amoyanus Yang, Wu, Wang, Zhao, Hwang & Cai, 2022 ; China, south China Sea

– Body with less than 30 chaetigers........................................................................ 6

6. Body with 23 chaetigers; posterior parapodia barely projected into lateral lappets; pygidium pigmented.......................................................................................... T. horsti Caullery, 1944 ; Indonesia

– Body with 23–29 chaetigers............................................................................. 7

7. Body with 27 chaetigers...................................................... T. chinensis Grube, 1869 ; China

– Body with 20–25 chaetigers............................................................................. 8

8. Branchiae 19–20 pairs, last five segments achaetous................. T. sanrikuensis Kobayashi & Kojima, 2021 ; Japan

– Branchiae 22 pairs....................................... T. oksae Hartmann-Schröder & Parker, 1995 ; Australia