Ampelisca

Overview & Synopsis

Key to the species of Ampelisca from the Brazilian coast (modified from Valério-Berardo et al. (2005))1. Head with a long rostrum reaching to end of peduncle article 1 of antenna 1 ................................. A. paria- Head lacking a defined rostrum.................................................................................................................. 22. Head strongly narrow anteriorly, anteroventral margin parallel to anterodorsal margin ............................ 3- Head slightly narrow anteriorly, ventral margin oblique............................................................................. 63. Posteroventral corner of epimeron 3 without spine .................................................................................... 4- Posteroventral corner of epimeron 3 with spine.......................................................................................... 54. Antenna 1 shorter than antenna 2 peduncle; uropod 3 rami very broad, distal margin rounded; urosomite 1 dorsal carina pointed .......................................................................................................... A. flabellicaudata- Antenna 1 subequal in length to antenna 2 peduncle, uropod 3 rami foliaceous; urosomite 1 dorsal carina saddle-shaped ........................................................................................................... A. meridionalis sp. nov.5. Pereopod 7 ventral margin of basis nearly transverse (in larger specimens can be rounded); urosomite 1 dorsal carina produced into a rounded process; posterior margin of epimeron 3 not bisinuate .................... ....................................................................................................................................................... A. cristata- Pereopod 7 ventral margin of basis rounded; urosomite 1 dorsal carina produced into an acute process; posterior margin of epimeron 3 bisinuate ........................................................................... A. brevisimulata6. Pereopod 7 merus posterior margin strongly lobed, lobe extending to distal end of carpus or more ........ 7- Pereopod 7 merus posterior margin weakly lobed, lobe not extending to the middle of carpus ................ 97. Epimeron 3 postero-ventral corner without spine; telson distal margin blunt .............................. A.moreirai- Epimeron 3 postero-ventral corner with a spine; telson distal margin pointed .......................................... 88. Pereopod 7 propodus longer than twice dactylus length; uropod 2 both rami with 1 long apical robust seta ............................................................................................................................... A. longipropoda sp. nov.- Pereopod 7 propodus shorter than twice dactylus length; uropod 2 outer ramus with 1 long apical robust seta ............................................................................................................................................... A.pugetica9. Pereopod 7 carpus with 1 notch on anterior margin .................................................................................. 10- Pereopod 7 carpus without 1 notch on anterior margin............................................................................. 1210. Antenna 2 longer than body length; pereopod 7 propodus twice longer than carpus; uropod 3 rami broad .......................................................................................................................................... A. youngi sp. nov.- Antenna 2 shorter than body length; pereopod 7 propodus subequal in length to carpus; uropod 3 rami slender....................................................................................................................................................... 1111. Antenna 1 reaching to middle of peduncular article 5 of antenna 2; urosomite 1 dorsal carina raised into a lens-shaped process; inner ramus of uropod 3 distally uncinate ................................................... A. romigi- Antenna 1 reaching to end of peduncular article 4 of antenna 2, urosomite 1 dorsal carina rounded and without lens-shaped process; inner ramus of uropod 3 not distally uncinate ...................... A.subtropicalis12. Antenna 1 subequal in length to peduncle of antenna 2; uropod 3 outer margin of inner ramus nacked, outer ramus notched at tip ........................................................................................................ A.rodriguesi- Antenna 1 shorter than peduncle of antenna 2; uropod 3 inner ramus with 1 stout robust setae on outer mar- gin, outer ramus not notched at tip ........................................................................................................... 1313. Uropod 1 peduncle with 1 large robust seta on distal margin and outer ramus lacking marginal robust setae; pereopod 7 merus weakly produced posterodistally ...................................................... A. aff. lobata- Uropod 1 peduncle without 1 large robust seta on distal margin and outer ramus with marginal robust setae; pereopod 7 merus not produced posterodistally .................................................................. A. burkey