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Telson with more than 4 lateral spines, no teeth on the frontal lobe<br />
Diastylis tumida<br />
26- 2 pairs of protuberances on the carapace Diastylis cornuta<br />
Only one pair of protuberances on the carapace Diastylis boecki<br />
27- Carapace thickly covered with hairs, length over 25mm Diastylis goodsiri<br />
Carapace not thickly covered with hairs, length about 8mm Diastylis lucifera<br />
28- The pseudorostral lines form an angle broadly open towards the underside, propodus of<br />
pereopod 1 about twice as long as dactylus Diastylis laevis<br />
The pseudorostral lines run otherwise or absent 29<br />
29- Pereonites 2-4 without depressions in the mid-line 30<br />
Pereonites 2-4 depressed in the mid-line so that two distinct but low keels are formed<br />
32<br />
30- No pseudorostral lines 31<br />
Pseudorostral lines present Diastylis bradyi<br />
31- 2-3 vertical lines on the carapace Diastylis rugosa<br />
Only 1 oblique line on the carapace Diastylis boecki<br />
32- Pseudorostrum short Diastylis rathkei<br />
Pseudorostrum long Diastylis glabra<br />
*Key modified from Jones 1957 and 1976<br />
25
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