Taeniacanthidae

Tang, Danny & Izawa, Kunihiko, 2005, Biacanthus pleuronichthydis (Yamaguti, 1939) gen. n., comb. n. (Copepoda: Taeniacanthidae), an ectoparasite of flatfishes from Japanese waters, Zootaxa 1071, pp. 47-60 : 59-60

Key to the genera of Taeniacanthidae (based on adult females)

1. Leg 2 with inner coxal seta ........................................................................................... 2

­ Leg 2 without inner coxal seta .................................................................................... 10

2. Postantennal process absent .......................................................................................... 3

­ Postantennal process present ......................................................................................... 5

3. Rostral area with posteriorly directed, spiniform process on ventromedian surface ...... .............................................................................................................. Taeniacanthodes

­ Rostral area otherwise ................................................................................................... 4

4. Rostral area with Y­shaped, sclerotised structure bearing transverse rows of hooklets or ridges ......................................................................................... Pseudotaeniacanthus

­ Rostral area otherwise ......................................................................................... Phagus

5. Second pedigerous somite slender and long, forming elongate neck .......... Scolecicara

­ Second pedigerous somite not forming elongate neck.................................................. 6

6. Maxilliped claw absent.......................................................................................... Irodes

­ Maxilliped claw present ................................................................................................ 7

7. Uncinate process posterior to antennule base present....................... Biacanthus gen. n.

­ Uncinate process posterior to antennule base absent .................................................... 8

8. Rostral area with corrugated shield­like structure on ventromedian surface.................. .................................................................................................................... Taeniastrotos

­ Rostral area otherwise ................................................................................................... 9

9. Maxilliped claw with 2 long whip­like setae extending to or beyond distal limit of claw ..................................................................................................................... Anchistrotos

­ Maxilliped claw without 2 long, whip­like setae ..................................... Caudacanthus

10. Rami of leg 1 not flattened and expanded; setae on legs 1–4 spinulated.................... 11

­ Rami of leg 1 flattened and expanded; setae on legs 1–4 with long pinnules............. 12

11. Second pedigerous somite partially or completely fused to cephalothorax; maxilliped present ......................................................................................................... Clavisodalis

­ Second pedigerous somite free; maxilliped absent .......................................... Echinirus

12. Maxilliped reduced to pear­shaped swelling bearing a slender process armed with 3 setae .........................................................................................................Echinosocius

­ Maxilliped with well­developed basis and claw, or with well­developed basis but claw absent on distinct terminal segment ............................................................................ 13

13. Cephalothorax with ventrally directed lateral margins .................... Metataeniacanthus

­ Cephalothorax without ventrally directed lateral margins .......................................... 14

14. Maxilliped claw absent on terminal segment............................................... Nudisodalis

­ Maxilliped claw present on terminal segment............................................................. 15

15. Maxilliped with claw curved toward basis................................................. Cirracanthus

­ Maxilliped otherwise................................................................................ Taeniacanthus