Guyanacaris Sakai, 2011

Kou, Qi, Poore, Gary C. B. & Liu, Xinming, 2024, Description of a new species of Guyanacaris Sakai, 2011 (Decapoda: Axiidea: Axiidae) from the South China Sea, Raffles Bulletin of Zoology 72, pp. 62-70 : 63

Key to species of Guyanacaris Sakai, 2011

1. Chelipeds subequal, similar ...................................................... .......................... G. keralam Padate, Cubelio & Takeda, 2022

– Chelipeds unequal, dissimilar .................................................2

2. Eyestalk overreaching tip of rostrum .....................................3

– Eyestalk shorter than, or just reaching tip of rostrum ...........4

3. Cervical groove smooth; fingers of major cheliped without prominent teeth on opposable margin ...................................... ............................. G. hirsutimana ( Boesch & Smalley, 1972)

– Cervical groove armed with several denticles; fingers of major cheliped with prominent teeth on opposable margin ............... .................................................. G. caespitosa ( Squires, 1979)

4. Whole body covered with dense, short setae.........................5

– Body only with sparse, short setae.........................................6

5. Cervical groove smooth; eyestalk reaching midlength of rostrum; maxilliped 3 carpus armed with 1 distal tooth......................... .................................................... G. polychaetes ( Sakai, 1994)

– Cervical groove finely denticulate; eyestalk almost reaching tip of rostrum; maxilliped 3 carpus unarmed........................... ................................................. G. thailandensis ( Sakai, 2015)

6. Carapace with hepatic spine; cervical groove armed with 11 prominent spines; cheliped carpus with prominent teeth on upper margin; pereopod 2 carpus armed with 1 subdistal tooth on lower margin .................. G. spinosissima ( Rathbun, 1906)

– Carapace without hepatic spine; cervical groove unarmed; cheliped carpus tuberculate, without prominent tooth on upper margin; pereopod 2 carpus unarmed ........................................ ........................................................ G. xinzhengi , new species