Key to the Spionidae of the Philippines *
1. Specialized setae present on setiger 5..........................................................................................................7
- Specialized setae absent on setiger 5 ........................................................................................................... 2
2. Prostomium pointed..................................................................................................................................... 3
- Prostomium with lateral horns ............................................................. Malacoceros indicus (Fauvel, 1928)
3. Branchiae from setiger 1; with accessory branchiae ............................................. Dispio latilamella sp. n.
- Branchiae from setiger 2; without accessory branchiae .............................................................................. 4
4. Occipital tentacle present .............................................................................. Scolelepis magnicornuta sp. n.
- Occipital tentacle absent.............................................................................................................................. 5
5. Notopodial lamellae of anterior setigers with up to nine conical lobes................. Scolelepis alisonae sp. n.
- Notopodial lamellae of anterior setigers without conical lobes................................................................... 6
6. Notopodial hooded hooks begin on same setigers as neuropodial hooded hooks......................................... .............................................................................................................. Scolelepis hutchingsae Dauer, 1985
- Notopodial hooded hooks begin at least ten setigers posterior to beginning of neuropodial hooded hooks. ......................................................................................................................... Scolelepis villosivaina sp. n.
7. Setiger 5 with one type of major spine ........................................................................................................ 8
- Setiger 5 with two types of major spines................................................................................................... 16
8. Branchiae from setiger 2; tridentate hooded hooks present; setiger 4 with modified notosetae; setiger 5 only weakly modified ........................................................................ Tripolydora spinosa Woodwick, 1964
- Branchiae begin posterior to setiger 5, or absent; bidentate hooded hooks; setiger 5 highly modified ...... 9
9. Notosetae present on setiger 1; hooded hooks without constriction on shaft ..................... Dipolydora ….10
- Notosetae absent on setiger 1; hooded hooks with constriction on shaft ............................. Polydora ….12
10. Major spines of setiger 5 bidentate with a large lateral tooth and cowling connecting teeth; posterior noto- podia with awl-like modified spines ............................................... Dipolydora armata (Langerhans, 1880)
- Posterior notopodia lacking modified spines............................................................................................ 11
11. Major spines of setiger 5 with small subterminal protuberance on convex side; pygidium with large ven- tral lobe and 2 smaller dorsal lobes .................................................. Dipolydora socialis (Schmarda, 1861)
- Major spines of setiger 5 with two lateral teeth; small cuff-shaped pygidium.............................................. ............................................................................................... Dipolydora tridenticulata (Woodwick, 1964)
12. Bundles of needle-like notosetae protruding through cuticle of posterior setigers; pygidium with anal cirri ....................................................................................................................... Polydora robi Williams, 2000
- Bundles of posterior notosetae absent; pygidium cup-shaped................................................................... 13
13. Occipital tentacle absent............................................................................................................................ 14
- Occipital tentacle present ............................................................................ Polydora cavitensis Pillai, 1965
14. Palps without pigmentation ....................................................................................................................... 15
- Palps with bands of black pigment ......................................................... Polydora sp. A Williams, 2001**
15. Major spines of setiger 5 simple, falcate .................................................. Polydora mabinii Williams, 2001
- Major spines of setiger 5 with large lateral tooth .............................. Polydora umangivora Williams, 2001
16. Branchiae from setiger 2.............................................. Boccardia berkeleyorum Blake & Woodwick, 1971
- Branchiae from setiger 7, or absent ........................................................................................................... 17
17. Up to ten pairs of branchiae beginning on setiger 7; a borer in calcareous substrata.................................... ...................................................................................................... Carazziella reishi (Woodwick, 1964) ***
- Branchiae reduced, one or two pairs beginning on setiger 7 or absent; associated with sponges............ 18
18. Unilimbate capillary neurosetae in setigers 2–7; setiger 5 modified with two types of major spines arranged in a double row: dorsal row falcate with an apical shelf; ventral row with expanded distal end bearing up to 9 teeth along the apical edge and a capillary extension on the posterior end.......................... .................................................................................................... Polydorella dawydoffi Radashevsky, 1996
- Acicular neurosetae in setigers 2–7; setiger 5 modified with two types of major spines arranged in a dou- ble row: dorsal row simple, falcate; ventral row with slightly expanded distal end bearing small digitiform bosses .............................................................................................. Polydorella kamakamai Williams, 2004