Agathotanais Hansen 1913

Key to the species of Agathotanais (females)

1. Antenna with two articles.................................................................................................. A. manganicus Larsen, 1999

– Antenna with one article.................................................. 2

2. Uropod with one articulation between basal article and tip......................................................................................... 3

– Uropod without articulations between basal article and tip......................................................................................... 4

3. Length/width of pereonites 3 and 4 about 1.50; pleonites as wide as pereonite 6............................... A. ghilarovi

– Length/width of pereonites 3 and 4 almost 1.00; pleonites narrower than pereonite 6..... A. misakiensis sp. nov.

4. Fixed finger with two ventral simple setae; carpus of pereopods 1–3 lacking dorsodistal seta; pleonites narrower than pereonite 6............... A. ahyongi Larsen, 1999

– Fixed finger without ventral seta; carpus of pereopods 1 and 3 (no data for pereopod 2) with one dorsodistal seta; pleonites as wide as pereonite 6......... A. splendidus

– Fixed finger with one ventral simple seta; carpus of pereopods 1–3 with one dorsodistal seta; pleonites narrower than pereonite 6...................................................... 5

5. Dorsodistal simple seta on carpus of pereopod 2 long (longer than two-thirds of propodus length)................. 6

– Dorsodistal simple seta on carpus of pereopod 2 short (shorter than two-thirds of propodus length)............... 8

6. Body stout (BL/CW 5.30); cephalothorax length equal to CW...................... A. brevis Kudinova-Pasternak, 1990

– Body narrow (BL/CW more than 6.50); cephalothorax length longer than CW..................................................... 7

7. Pereonite 3 shorter than wide, pereonite 4 longer than wide (length/width 0.90 and 1.10, respectively); dactylus of pereopods 1–3 naked................................. A. ingolfi

– Pereonites 3 and 4 longer than wide (length/width 1.15 and 1.30, respectively); dactylus of pereopods 1–3 with one simple seta............................... A. hanseni Lang, 1971

8. Carpus and propodus of pereopods 4–6 with three and two distal spiniform setae, respectively........... A. hadalis

– Carpus and propodus of pereopods 4–6 with one and three distal spiniform setae, respectively........................ 9

9. Pleonites narrow (pleonite width 0.75 times pereonite-6 width and 0.65 times CW); basis of pereopods 1–6 without dorsal small spines; carpus and propodus of pereopods 4–6 with ventral small spines................................................................................................ A. spinipoda

– Pleonites very narrow (pleonite width 0.65 times pereonite-6 width and 0.45 times CW); basis of pereopods 1–6 with dorsal small spines; carpus and propodus of pereopods 4–6 without ventral small spines............................................................................... A. toyoshioae sp. nov.