Rapipontonia

Marin, Ivan, 2009, A review of the pontoniine shrimp genus Rapipontonia Marin, 2007 (Decapoda: Caridea: Palaemonidae), with the description of a new species from the Indo-West Pacific, Zootaxa 2289, pp. 1-17 : 14

Key to the species of the genus Rapipontonia

1. Rostrum reaching to intermediate segment of antennular peduncle. Distal portion of rostrum rather short, about 1/4 of total rostral length; without distinct gap between second dorsal and subapical teeth; distributed in the Western and the Eastern Atlantic ....................................................................................................................................... R. platalea

- Rostrum overreaching antennular peduncle. Distal portion of rostrum long, about 1/3 of total rostral length, with distinct gap between second dorsal and subapical rostral teeth; distributed in the Indo-West Pacific.............................. 2

2. Second pereiopod equal in size and shape in adult females; carpus of second pereiopods about twice as long as palm; fingers about half of palm length ..................................................................................................................... R. galene

- Second pereiopod unequal in size and shape in adult females; carpus of major second pereiopods equal to palm length; fingers of major second pereiopod less than 1/5 of palm length; fingers of minor second pereiopod about 1/3 of palm length .............................................................................................................................................................. 3

3. Carpus of minor second pereiopod about twice palm length. Third pereiopod usually with 3 unpaired spines; most proximal unpaired spine similar to the length of the previous spine. Most distal tooth in dorsal rostral crest situated on level of distal margin of basal antennular segment in females ........................................................ R. hydra n. sp.

- Carpus of minor second pereiopod less than twice palm length. Third pereiopod usually with 2 unpaired spines; the third proximal spine, if present, not exceeding the half of the length of the previous one. Most distal tooth in dorsal rostral crest slightly overreaching half-length of basal antennular segment in females ........................ R. paragalene