Sergestidae, Dana, 1852

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 27

Key to species of family Sergestidae

1. Arthrobranchs of up to 13 rami, lamellae relatively large and independent in appearance; petasma with processus ventralis forked............................................................................ Petalidium suspiriosum

– Arthrobranchs with more than 13 rami, lamellae small and closely spaced; petasma with processus ventralis not forked.... 2

2. Organs of Pesta present, without dermal photophores. Ovary confined to cephalothorax. Supraorbital and hepatic spines present or absent......................................................................................... 3

– Organs of Pesta absent, with or without dermal photophores. Ovary may extend into abdomen. Supraorbital and hepatic spines absent............................................................................................. 6

3. Third maxilliped at least as long as pereopod 3.............................................................. 4

– Third maxilliped not as long as pereopod 3.................................................. Eusergestes similis

4. Third maxilliped as long as entire body anterior to posterior half of abdominal somite 6............. Parasergestes halia

– Third maxilliped not as long as entire body anterior to posterior half of abdominal somite 6.......................... 5

5. Basal segment of third maxilliped swollen. Inner uropod without setose margin.................. Allosergestes pestafer

– Basal segment of third maxilliped slender. Inner uropod with setose margin............ Neosergestes consobrinus (Milne)

6. Dermal photophores absent............................................................................. 7

– Dermal photophores present............................................................................. 8

7. Posterior to cervical groove, lateral groove of carapace having dorsal branch. Cornea of eye not much wider than eyestalk........................................................................................... Sergia japonica

– Posterior to cervical groove, lateral groove of carapace without dorsal branch. Cornea of eye wider than eyestalk.................................................................................................. Sergia laminata

8. Body slender. Second and third segments of antennular peduncle not short, thick...................... Sergia tenuiremis

– Body compact. Second and third segments of antennular peduncle short, thick........................... Sergia phorca