LESTRIGONIDAE, Zeidler, 2004

Zeidler, Wolfgang, 2004, A review of the families and genera of the hyperiidean amphipod superfamily Phronimoidea Bowman & Gruner, 1973 (Crustacea: Amphipoda: Hyperiidea), Zootaxa 567, pp. 1-66 : 31-32

Key to the genera of the family LESTRIGONIDAE

1. Gnathopod 2 chelate, dactylus closing against robust propodus. Pereopods 3–7 prehensile ......................................................................................... Phronimopsis Claus, 1879

­ Gnathopod 2 chelate, propodus closing against spoon­shaped carpus. Pereopods 3–7 not prehensile 2

2. Pereopod 5 longer than P6 (1.1–1.2x). Pereopods 6 & 7; dactylus with distinct upward bend midway. Pereonites 1–5 fused in both sexes ............. Themistella Bovallius, 1887

­ Pereopod 5 not longer than P6. Pereopods 6 & 7 with normal dactylus. Pereonites 1–5 rarely fused .................................................................................................................. 3

3. Pereopod 5 about 0.8x length of P6 .................................. Hyperionyx Bowman, 1973

­ Pereopod 5 subequal in length to P6 ........................................................................... 4

4. Pereopod 7 clearly shorter than P5 or P6; about 0.7x length of P6 ................................ ........................................................................................... Hyperioides Chevreux, 1900

­ Pereopod 7 slightly shorter than P6 but similar in length to P5 .................................. 5

5. First two pereonites fused in adult male & female. Maxilliped; outer lobes fused medially; inner lobe rudimentary .................................................. Hyperietta Bowman, 1973

­ First three, four or five pereonites fused in adult female; first two or four pereonites fused in adult male. Maxilliped; outer lobes separate; inner lobe usually well­developed ................................................................................. Lestrigonus Milne­Edwards, 1830

Key to male species of LESTRIGONIDAE with pereonites 1–2 fused (except Phronimopsis )

1. Eyes limited to dorsal surface of head ............. Hyperioides longipes Chevreux, 1900

­ Eyes occupying most of head surface ......................................................................... 2

2. Pereopods 5–7; carpus with at least one robust seta on anterior margin....................... 3

­ Pereopods 5–7; carpus without robust seta ................................................................... 4

3. Hyperietta parviceps , H. stephenseni and H. stebbingi ................................................. .................................................— consult Bowman (1973) to distinguish these species

4. Pereopods 3 and 4; carpus with at least two conspicuous robust setae on posterior margin 5.................................................................................................................................... 5

­ Pereopods 3 and 4; carpus with only one conspicuous robust seta on posterior margin ..................................................................................................................................... 10

5. Pereopods 5–7; propodus with recurved dentate hook overlapping dactylus ................. .......................................................................... Lestrigonus crucipes ( Bovallius, 1889)

­ Pereopods 5–7; propodus with smooth spine overlapping dactylus ............................. 6

6. Gland cone pointed ventrally .................... Lestrigonus schizogeneios ( Stebbing, 1888)

­ Gland cone rounded ventrally ....................................................................................... 7

7. Gnathopod 1; basis deeply concave distally on anterior margin .................................... ................................................................................. Hyperietta luzoni ( Stebbing, 1888)

­ Gnathopod 1; basis with at most, an even bulge on anterior margin ............................ 8

8. Pereopod 5; basis relatively broad, width about 0.8x length, overlapping anterior margin of ischium ...................................................... Hyperietta vosseleri ( Stebbing, 1904)

­ Pereopod 5; basis narrow, width about 0.5x length, not overlapping ischium.............. 9

9. Gnathopod 1; propodus with one robust seta on anterior margin ................................... ......................................................................... Lestrigonus shoemakeri Bowman, 1973

­ Gnathopod 1; propodus with two robust setae on anterior margin ................................. ........................................................................ Lestrigonus latissimus ( Bovallius, 1889)

10. Head with additional eye facets dorsally; forming small lobe over A1. Pereopod 7 much shorter than P6; dactylus long, almost half­length propodus ................................ .......................................................................... Hyperioides sibaginis ( Stebbing, 1888)

­ Head with evenly spread eye facets; evenly rounded anteriorly. Pereopod 7 subequal in length to P6; dactylus short, about 0.3x length of propodus .............................................................. Lestrigonus macrophthalmus ( Vosseler, 1901)