Exogone (Parexogone), 1983

Guillermo San Martin, 2005, Exogoninae (Polychaeta: Syllidae) from Australia With the Description of a New Genus and Twenty-two New Species, Records of the Australian Museum 57, pp. 39-152 : 109

Key to the species of Exogone (Parexogone) recorded from Australia

1 Adults with dorsal cirri on chaetiger 2 .......................................................................................... 2

—— Adults without dorsal cirri on chaetiger 2 ..................................................................................... 6

2 All antennae small, papilliform. Palps free from each other for distal 1 ⁄ 3 ............................................................................................................ E. (P.) exmouthensis

—— Antennae longer, not papilliform. Palps fused along their length ................................................ 3

3 Median antenna similar to combined length of prostomium and palps; lateral antennae sphaerical to egg-shaped ...................................... E. (P.) penelopeae n.sp.

—— Median antenna distinctly longer than combined length of prostomium and palps; lateral antennae elongate ......................................................................... 4

4 Dorsal and ventral simple chaetae bidentate, with both teeth similar ............................. E. (P.) wolfi

—— At least, ventral simple chaetae with subdistal tooth distinctly larger than distal one ................................................................................................................................ 5

5 Ventral simple chaetae large, distinctly thick. Dorsal simple chaetae with subdistal tooth larger than distal one. Anterior parapodia each with some chaetae provided with long, spiniger-like blades ....................... E. (P.) patriciae n.sp.

—— Ventral simple chaetae not so large. Dorsal simple chaetae with both teeth similar. Without compound chaetae with long, spiniger-like blades ............................................................................................. E. (P.) annamurrayae n.sp.

6 Median antenna long, similar in length to combined length of prostomium and palps .................................................................................................................... 7

—— Median antenna distinctly shorter than combined length of prostomium and palps .................................................................................................................. 10

7 Compound chaetae all with short, similar blades .......................................................................... 8

—— At least on anterior parapodia, some compound chaetae with distinctly longer blades than other chaetae, spiniger-like ............................................................. 9

8 Blades short, all similar in length; dorsal and ventral simple chaetae thick, bidentate, with teeth separated from each other .................................... E. (P.) wilsoni n.sp.

—— Blades with usual dorsoventral gradation in length. Dorsal and ventral simple chaetae not unusually thick and teeth close to each other ..................................................................................................................... E. (P.) sexoculata

9 Spiniger-like blades, at least on anterior parapodia, more than 4 times length of falciger blades; dorsal cirri minute ............................................. E. (P.) tasmanica

—— Spiniger-like blades not so long; dorsal cirri larger .............................................. E. (P.) gambiae

10 Antennae inserted on posterior margin of prostomium. Lateral antennae and dorsal cirri minute .......................................................................... E. (P.) caribensis

—— Antennae inserted on anterior margin of prostomium. Lateral antennae and dorsal cirri not unusually small .................................................. E. (P.) homosetosa