Quadrivisio, Stebbing, 1907

Bhoi, Gitanjali, Myers, Alan A., Tarafdar, Lipika, Smita, Moili, Jena, Ajay Kumar & Patro, Shesdev, 2023, A new species of the amphipod genus Quadrivisio (Senticaudata, Maeridae) from Chilika Lagoon, India, Zootaxa 5256 (1), pp. 36-42 : 41

Identification key to species of Quadrivisio (updated after Gnohossou and Piscart, 2019)

1. Carina absent on pleonites or urosome in males and females.................................................... 2

– Carina present on pleonites or urosome in males and/or females................................................ 6

2. Male gnathopod 2 propodus palm without posterodistal shelf...................... Q. chevreuxi Gordon & Monod, 1968

– Male gnathopod 2 propodus palm with posterodistal shelf..................................................... 3

3. Male gnathopod 2 dactylus short, not reaching end of palm.......................... .. Q. aviceps (K.H. Barnard, 1940)

– Male gnathopod 2 dactylus subequal to palm length.......................................................... 4

4. Urosome and telson covered in dense setae; male gnathopod 2 propodus anterior margin produced into lobe................................................................................................. Q. lobata Asari, 1983

– Urosome and telson without dense setae; male gnathopod 2 anterior margin not produced.............................5

5. Posterior margin of pereopod 7 basis regularly convex, telson with robust setae along inner margins of each lobe............................................................................... Q. sarina Lowry & Springthorpe, 2005

– Posterior margin of pereopod 7 basis not convex, telson without robust setae along innermargins of each lobe................................................................................. Q. laleyei Gnohossou and Piscart, 2019

6. Telson with robust setae along inner margins of each lobe............................. Q. bengalensis Stebbing, 1907

– Telson without setae along inner margin of each lobe......................................................... 7

7. Epimeron 3 margin smooth............................................................................. 8

- Epimeron 3 margin with several tooth..................................................................... 9

8. Antennae 2 flagellum is nearly twice the length of the fifth peduncle............................ Q. chilikensis sp. nov.

– Antennae 2 flagellum is subequal to fifth peduncle...................................... Q. lutzi ( Shoemaker, 1933)

9. Accessory flagellum with 7 articles; mandibular palp articles 2–3 without setae.... Q. bousfieldi Karaman & Barnard, 1979

- Accessory flagellum with 9–10 articles; mandibular palp articles 2–3 with setae .......... Q. meufong Hughes & Haji, 2016