Cyclocaris, Guilelmi Chevreux, 1899

Horton, Tammy & Thurston, Michael H., 2014, A revision of the bathyal and abyssal necrophage genus Cyclocaris Stebbing, 1888 (Crustacea: Amphipoda: Cyclocaridae) with the addition of two new species from the Atlantic Ocean, Zootaxa 3796 (3), pp. 507-527 : 525

Key to the species of Cyclocaris

1. Head without prominent eye lobe; single pair of eyes or eyes covering whole of head (may fade in alcohol)............... 2

- Head with distinct subtriangular eye lobe; two pairs of eyes present (may fade in alcohol)............................3

2. Eyes covering whole of head; Arctic Ocean, north-west Pacific Ocean, cold water species............ .. Cyclocaris guilelmi

- Large eye not covering whole of head; Pacific Ocean species................................... Cyclocaris tahitensis

3. Pereopods 5–7 merus expansion broad, (L/W ratios 1.6, 1.7, 2.2 for P5–7 respectively) (see Figure 10 : P5–7); Pereopod 6 basis with bevel; basis broadly expanded, subquadrate (see Figure 10 :P6)................................. Cyclocaris franki

- Pereopods 5–7 merus expansion narrower, (L/W ratios 2.2, 2.8, 2.9 for P5–7) (see figure 6: P5–7); Pereopod 6 basis without bevel; basis expanded, oval (see Figure 6 :P6)..................................................C yclocaris lowryi

Figures

FIGURE 6. C. lowryi sp. nov.: holotype; adult female, 17.1 mm, gnathopods, peraeopods and telson.

FIGURE 10. C. franki sp. nov.: holotype; adult female, 20.5 mm, peraeopods, uropods and telson.