Trevathana, Chan & Chen & Achituv & Lin, 2017

Chan, Benny Kwok Kan, Chen, Yi-Yang, Achituv, Yair & Lin, Hsiu-Chin, 2017, Description of five new coral associated Barnacles of the genus Trevathana (Balanomorpha: Pyrgomatidae) in Pacific Waters, Zootaxa 4363 (2), pp. 151-202 : 198

Key to current species of Trevathana (modified from Achituv & Hosie (2013)

1 Tergum with internal tooth.............................................................................. 2

- Tergum without internal tooth........................................................................... 14

2 Internal tergal tooth axis parallel to basal margin............................................................. 3

- Internal tergal tooth axis perpendicular to basal margin........................................................ 5

3 Scutum very elongate, occludent margin>4 times longer than articular margin..................................... 4

- Scutum elongate, occludent margin <4 times longer than articular margin.................................... T. jensi

4 Outer lamina with up to 21 low but distinct ribs, same size as inner lamina............................... T. mizrachae

- Outer lamina with indistinct ribs, smaller than inner lamina exposing parietal septa....................... T. margaretae

5 Scutal inter-locking tooth broad, projecting from apex of articular margin......................................... 6

- Scutal inter-locking tooth narrow, projecting medially from articular margin...................................... 7

6 Tergal internal tooth not extending beyond basal margin................................................ T. paulayi

- Tergal internal tooth extending beyond basal margin.............................................. T. dongshaensis

7 Scutum occludent margin ±3 times longer than articular margin................................................. 8

- Scutum occludent margin <3 times longer than articular margin................................................ 13

8. Cirrus II with conical spines............................................................... T. conica sp. nov.

- Cirrus II without conical spines.......................................................................... 9

9 Distal segments of posterior ramus of cirrus III with row of conical spines....................................... 10

- Distal segments of posterior ramus of cirrus III without row of conical spines................................ T. sarae

10 Basidorsal point of penis short, about 1/6 of basal segment of the penis.................................... T. dentata

- Basidorsal point of penis long, length> half of basal segment of the penis........................................ 11

11 Tergum with long tooth extending beyond carinal margin...................................... T. longidonta sp. nov

- Tergum with tooth not extending beyond carinal margin........................................... T. doni sp. nov.

12 Tergal apex approximately forming a right angle; carinal margin convex......................................... 13

- Tergal apex acute; carinal margin concave............................................................. T. isfae

13 Scutum with tooth near basi-tergal angle; tergum slightly beaked....................................... T. orientalis

- Scutum without tooth near basi-tergal angle; tergum not beaked...................................... T. synthesysae

14 Scutum with adductor ridge............................................................................ 15

- Scutum without adductor ridge.................................................................... T. tureiae

15 Tergal spur distinct, scutal adductor ridge extending beyond basal margin........................................ 16

- Tergal spur indistinct, scutal adductor ridge not projecting beyond basal margin.............................. T. niuea

16 Cirrus III with conical spines....................................................................... T. noae

- Cirrus III without conical spines.......................................................... T. taiwanus sp. nov.