Quadrivisio species

Hughes, Lauren E. & Kaji, Tomonari, 2016, Description of a new species of Quadrivisio Stebbing, 1907, from Songkhla Lake, Thailand (Crustacea: Peracarida: Amphipoda: Maeridae), Raffles Bulletin of Zoology 64, pp. 351-359 : 358

Key to world Quadrivisio species

(modified after Karaman & Barnard, 1979)

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

– Carina present on pleonites or urosome in males and females.....................................................................................5

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.................................................... .................................. Q. sarina Lowry & Springthorpe, 2005

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

– Telson without setae along inner margin of each lobe..........6

6. Epimeron 3 margins with several teeth..................................7

– Epimeron 3 margins smooth ........ Q. lutzi ( Shoemaker, 1933)

7. 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 sp. nov.