Heptacarpus

Komai, Tomoyuki & Ivanov, Boris G., 2008, Identities of three taxa of the hippolytid shrimp genus Heptacarpus (Crustacea: Decapoda: Caridea), with description of a new species from East Asian waters, Zootaxa 1684, pp. 1-34 : 31

Key to Asian species of Heptacarpus characterized by the lack of pereopodal epipods

1. Fifth pleonal pleuron unarmed................................................................. H. longirostris ( Kobjakova, 1936)

–. Fifth pleonal pleuron with sharp posteroventral tooth................................................................................. 2

2. Third maxilliped overreaching midlength of antennal scale ....................................................................... 3

–. Third maxilliped falling short of midlength of antennal scale..................................................................... 5

3. Third maxilliped overreaching distal margin of antennal scale..................... H. maxillipes ( Rathbun, 1902)

–. Third maxilliped falling short of distal margin of antennal scale............................................................... 4

4. Rostral lateral carina sharp; merus of third pereopods with 7–10 lateral spines..... H. acuticarinatus n. sp.

–. Rostral lateral carina blunt; merus of third pereopod with 3–5 lateral spines .............................................................................................................................................................. H. camtschaticus ( Stimpson, 1860)

5. Rostrum with 6–9 ventral teeth; tergite of third pleonal somite strongly elevated in posterior part, making pleon noticeably gibbous; third pereopod overreaching midlength of antennal scale...................................................................................................................................................... H. geniculatus ( Stimpson, 1860)

–. Rostrum with 9–13 ventral teeth; tergite of third pleonal somite only slightly convex; third pereopod not reaching midlength of antennal scale....................................................... H. pandaloides ( Stimpson, 1860)