Lanceola, Say, 1818

Zeidler, Wolfgang, 2009, A review of the hyperiidean amphipod superfamily Lanceoloidea Bowman & Gruner, 1973 (Crustacea: Amphipoda: Hyperiidea), Zootaxa 2000, pp. 1-117 : 11-12

Key to the species of the genus Lanceola

1. Pereopods 3 & 4; dactylus length about 0.75x propodus .......................................... L. longidactyla Vinogradov, 1964

- Pereopods 3 & 4; dactylus length much less than 0.5x propodus.................................................................................2

2. Pereopods 3 & 4 subchelate, formed by narrow, curved propodus folded against enlarged carpus, with row of strong setae along posterior margin ........................................................................................... L. chelifera Vinogradov, 1970

- Pereopods 3 & 4 not subchelate, with normal, relatively narrow carpus and propodus...............................................3

3. Pereopod 5; dactylus not fully retractile, only partly hooded.......................................................................................4

- Pereopods 5–7 all with similar, fully retractile and hooded dactyls.............................................................................6

4. Pereopods 6 & 7; only proximal part of dactylus retractile .................................................. L. falsa Vinogradov, 1970

- Pereopods 6 & 7 with normal, fully retractile and hooded dactyls...............................................................................5

5. Pereopod 5 weakly subchelate, formed by partly hooded, curved dactylus pressed against anterior margin of slightly distally swollen propodus. Antennae 2 slightly longer than A1 ................................... L. sphaerica Vinogradov, 1957

- Pereopod 5; dactylus relatively straight, not hooded, partly retractile proximally. Antennae 2 slightly shorter than A1 ........................................................................................................................................................... L. gruneri sp. nov.

6. Antennae 2; distal peduncular article with distinct lobe overlapping almost half following article medially ............... ...................................................................................................................................... L. intermedia Vinogradov, 1960

- Antennae 2; distal peduncular article without medial lobe or with relatively small lobe.............................................7

7. Pereopod 7; length about 0.75x P6. Antennae 2 only slightly longer or subequal in length to A1 ................................ ................................................................................................................................................. L. clausi Bovallius, 1885

- Pereopod 7; length about 0.5x P6. Antennae 2 considerably longer than A1...............................................................8

8. Telson shorter than peduncle of U3..............................................................................................................................9

- Telson as long or longer than peduncle of U3.............................................................................................................11

9. Telson length about 0.5x peduncle of U3 ............................................................................... L. loveni Bovallius, 1885

- Telson length about 0.75x (or more) peduncle of U3.................................................................................................10

10. Pereonite 6 to urosomite 1 produced into dorsal denticles. Gnathopod 1; carpus with broadened distal margin, at least twice width propodus. Eyes reniform ........................................................................... L. serrata Bovallius, 1885

- Pereonites, pleonites and urosomites without dorsal denticles. Gnathopod 1; carpus with distal margin only slightly wider than propodus. Eyes with crystalline cones .................................................................. L. felina Bovallius, 1885

11. Pereopod 5; merus broadened, elongated-oval. Pleonite 1 with dorsal depression ....... L. laticarpa Vinogradov, 1957

- Pereopod 5; merus linear, not broadened. Pleonite 1 without dorsal depression........................................................12

12. Head without rostrum. Pereopods 3–5; anterodistal corner of merus produced into small, sharp corner. Eyes reniform .............................................................................................................................................. L. pacifica Stebbing, 1888

- Head produced into distinct hook-shaped or rounded rostrum. Pereopods 3–5; anterodistal corner of merus not noticeably produced. Eyes with crystalline cones. .................................................................................................... 13

13. Head produced into hook-shaped rostrum. Antennae 1; distal three articles fused. Pereopod 6; merus linear, without anterior bulge ........................................................................................................................ L. sayana Bovallius, 1885

- Head produced into broad, rounded rostrum. Antennae 1; distal articles separate. Pereopod 6; merus with distinct anterior, medial bulge .................................................................................................................... L. galatheae sp. nov.