Alloleptochelia, Gutu, 2016

Tzeng, You-Wei, Wei, Chih-Lin, Ma, Lin & Li, Xinzheng, 2023, Three new species of Paratanaoidea (Crustacea, Tanaidacea) from the South China Sea, Zootaxa 5375 (1), pp. 1-30 : 13-14

Key to the species of Alloleptochelia (modified and updated from Guţu 2016)

Female

1 Body less than six times longer than wide; dorsal seta of pereopods 2–3 basis longer than merus.... A. falciformes sp. nov.

- Body at least seven times longer than wide; dorsal seta of pereopods 2–3 basis shorter than merus..................... 2

2 Pereopod-2 merus with one robust ventrodistal spiniform seta; ventrodistal seta of carpus longer than half length of propodus........................................................................................... A. helenae

- Pereopod-2 merus with one or two small ventrodistal spiniform setae; ventrodistal seta of carpus shorter than half length of propodus........................................................................................... 3

3 Pereopod-1 dactylus together with unguis slightly shorter than propodus.................................. A. heardi

- Pereopod-1 dactylus together with unguis longer than propodus................................................ 4

4 Pereopod-1 dactylus together with unguis slightly longer than propodus and much shorter than basis........ A. monotricha

- Pereopod-1 dactylus together with unguis much longer than propodus and about as long as basis.............. A. angusta Male

1 Antennule flagellum with 13 articles; antenna article-3 without dorsodistal spiniform (or simple) seta.... A. multiarticulata

- Antennule flagellum with at most ten articles; antenna article-3 with dorsodistal spiniform (or simple) seta.............. 2

2 Antenna article-3 with very long dorsodistal spiniform seta (about half as long as article-4).......................... 3

- Antenna article-3 with relatively short dorsodistal spiniform (or simple) seta (much shorter than half length of article-4)... 4

3 Pereopods 4–6 merus with dorsodistal seta......................................................... A. insolita

- Pereopods 4–6 merus without dorsodistal seta................................................... A. monotricha

4 Pereopods 4–6 ischium with three ventral setae..................................................... A. helenae

- Pereopods 4–6 ischium with two ventral setae.............................................................. 5

5 Pereopods 4–6 dactylus long and slender, falciform, about 0.7 times as long as propodus............................ 6

- Pereopods 4–6 dactylus stout, at most half as long as propodus................................................. 7

6 Pereopods 4–6 dactylus and unguis separated, with distal setae...................................... A. longimana

- Pereopods 4–6 dactylus and unguis not clearly separated, naked.............................. A. falciformes sp. nov.

7 Antennule peduncle article-3 longer than half of article-2........................................... A. erythraea

- Antennule peduncle article-3 at most one-third as long as article-2.............................................. 8

8 Pereopods 2–3 merus with two ventrodistal small spiniform setae...................................... A. angusta

- Pereopods 2–3 merus with one ventrodistal stout spiniform seta................................................ 9

9 Cheliped fixed finger incisive margin with small proximal apophysis..................................... A. heardi

- Cheliped fixed finger smooth.................................................................... A. evansi