Hourstonius Hoover & Bousfield 2001
Creators: name: Lee, Kyung-Sook
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Amphilochidae
Hourstonius

description: Key to the North Pacific Hourstonius species
1. Gnathopod 2, carpal lobe very short; palm transverse .............................................. H. pusilloides (Shoemaker, 1942) Gnathopod 2, carpal lobe long; palm oblique............................................................................................................... 2
2. Gnathopod 2, basis without posterodistal extension..................................................................................................... 3 Gnathopod 2, basis with posterodistal extension.......................................................................................................... 9
3. Gnathopod 2, basis with posterodistal spine; telson, length> 2.3 × width .................................................................. 4 Gnathopod 2, basis with posterodistal seta(e); telson, length <2.1 × width ................................................................ 6
4. Gnathopod 2, propodus with 2 dorsal spines; epimeron 3 with posteroventral cusp ........ H. vilordes (Barnard, 1962) Gnathopod 2, propodus lacking dorsal spine; epimeron 3 lacking posteroventral cusp.............................................. 5
5. Carpal lobe of gnathopod 2 extending beyond palmar angle, dactyli on gnathopods smooth on inner margin............. ........................................................................................................................................... H. longus (Hirayama, 1983) Carpal lobe of gnathopod 2 short, not extending beyond palmar angle, dactyli on gnathopods serrate on inner margin ........................................................................................................................................ H. japonica (Hirayama, 1983)
6. Epimeron 2 with small posteroventral cusp.................................................................................................................. 7 Epimeron 2 lacking posteroventral cusp..................................................................... H. breviculus (Hirayama, 1983)
7. Antenna 1, peduncular article 2 <article 1; dactyls of pereopods 3–7 simple ............................................................. 8 Antenna 1, peduncular article 2> article 1; dactyls of pereopods 3–7 inner margin with tooth at base of unguis........ .................................................................................................................................................... H. geojeensis sp. nov.
8. Telson, strongly tapering, apically narrowly rounded; maxilliped, mediodistal margin of outer plate incised.............. .................................................................................................................................................. H. pele (Barnard, 1970) Telson, gently tapering, apically broadly rounded; maxilliped, mediodistal margin of outer plate straight ................. ........................................................................................................................................... H. baciroa (Barnard, 1979)
9. Telson short, semiovate, not reaching distal end of uropod 2................................................................. .................... 10 Telson very long, reaching distal end of uropod 2................................................ H. robastodentes (Hirayama, 1983)
10. In female, gnathopod 2 propodus with 2 anteromedial spines; epimeron 3, subquadrate with posteroventral cusp...... ....................................................................................................................... H. oozekii (Hirayama & Takeuchi, 1993) In female, gnathopod 2 propodus lacking anteromedial spines; epimeron 3, posteroventrally produced without cusp .................................................................................................................................... H. koreana (Kim & Kim, 1992)
description: Published as part of Lee, Kyung-Sook, 2010, A new species and new record of the Amphilochidae (Crustacea: Amphipoda) from Korea, pp. 21-36 in Zootaxa 2477 on page 31, DOI: 10.5281/zenodo.893974