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Key to the British Species of Pseudocumatidae<br />
1- The first pereopod shortened and peculiarly formed with expanded flattened carpus<br />
Petalosarsia declivis<br />
♀<br />
♂<br />
The first pereopod not shortened, of normal shape 2<br />
2- With 1 or 2 pairs of pleopods, exopods well developed on maxilliped 3 and pereopods 1-4<br />
(males) 3<br />
Without pleopods, exopods well developed on maxilliped 3 and pereopods 1 and 2 but<br />
rudimentary on pereopods 3 and 4 (females) 5<br />
3- With 1 pair of pleopods. Antenna 2 flagellum extends to the end of pereon, or just beyond.<br />
Uropod peduncle with only one inner spine: endopod with 5-7 stout setulose setae and very<br />
fine setae in between Monopseudocuma gilsoni ♂<br />
With 2 pairs of pleopods. Antenna 2 flagellum long, extends to at least pleonite 5<br />
4<br />
4- Anterolateral angle of the carapace armed with 3 teeth. Uropod peduncle with 1 simple<br />
seta Pseudocuma similis ♂<br />
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