1 - See key to species Groups and independent species of Paraeuchaeta
2 - Outer spine of 2nd exopodal segment (or the 2nd of the first 2 exopodal segments forming a proximal, compound segment) of P1 normally developed (Fig.29-f).
3 - Outer lobe of Mx1 with 7 long setae in addition to 1 or 2 minute setae proximally (Fig.29-e).
4 - Genital somite without a conical process on left side close to anterior base of genital prominence (Fig.29-c).
5 - Dorsally and ventrally, genital somite symmetrical.
6 - Laterally, genital flange with normal posterior lobe (Fig.29-c).
7 - Laterally, genital somite with more or less smooth dorsal margin (Fig.29-c).
8 - Laterally, genital prominence with nearly straight or only slightly bulging posterior margin (Fig.29-c).
9 - Outer lobe of Mx1 with 7 long setae plus 1 or 2 very minute setae (Fig.29-e).
10 - Laterally, genital prominence with posterior margin equal to or longer than posterior ventral wall of somite (Fig.29-c).
11 - Laterally, posterior margin of genital prominence and posterior ventral wall of somite forming an angle of more than 140° (Fig.29-c).
12 - Laterally, genital prominence with posterior margin about as long as posterior ventral wall of somite (Fig.29-c).
13 - In P1 exopod, 2nd outer spine reaching base of 3rd outer spine (Fig.29-f).
14- Laterally, posterior margin of genital prominence straight and more or less distinct from posterior ventral wall of somite (Fig.29-c).