Key to species of Nephtyidae of Lizard Island

1. Parapodia with branchiae (Figs 1 C, 2C, 3D)................................................................ 2

- Parapodia without branchiae (Figs 5 C, 6F), or if present, reduced in size and straight..................3 ( Micronephthys)

2. (1) Lyrate chaetae present (Fig. 2 G); notopodial interramal branchiae involuted (Fig. 2 C, E); proximal region of pharynx with ver- rucae............................................................................................... 6

- Lyrate chaetae absent; notopodial interramal branchiae recurved, start on chaetiger 5 and continue to posterior chaetigers; proximal region of pharynx smooth.......................................................... Nephtys inornata

3. (1) Notopodia of chaetiger 1 with specialised dentate chaetae (margin with teeth fused to form knobs, Fig. 11 D); eyespots present between chaetigers 2 and 3..................................................................... M. stammeri

- Notopodia of chaetiger 1 without specialised dentate chaetae................................................... 4

4. (3) Eyes externally visible (Figs 4 A, 8A)...................................................................... 5

- Eyes not visible externally.............................................................. M. platycephala n.sp.

5. (4) Two pairs of lensed overlapping eyes present on prostomium (Fig. 4 A).................................. M. oculifera

- One pair of eyes present at level of chaetiger 2 (Fig. 8 A)...................................... M. cf. sphaerocirrata

6. (2) Involute interramal notopodial branchiae present from chaetiger 7, interramal neuropodial branchiae present from chaetiger 8– 10 (Fig. 3 D); middorsal subdistal pharyngeal papilla absent.................................... Aglaophamus verrilli

- Involute interramal notopodial branchiae present from chaetiger 3, neuropodial branchiae absent (Fig.1 C, E); elongate middor- sal subdistal pharyngeal papilla present................................................. Aglaophamus cf. lobatus