A new species of heterochelous tanaidacean Tanaissus (Paratanaoidea: Tanaissuidae) from the north-west Iberian Peninsula Author Esquete, Patricia Author Rubal, Marcos Author Veiga, Puri Author Troncoso, Jesus text Zootaxa 2015 3995 1 189 202 journal article 10.11646/zootaxa.3995.1.17 6500dda9-4931-4a25-bc28-9fa0018b2444 1175-5326 239215 37772558-6DAC-451B-9E60-2D60818791BD Key to species of Tanais sus (females) 1. Cheliped propodus with bifid dorsodistal crest near dactylus insertion............................................ 2 – Cheliped propodus without bifid crest..................................................................... 3 2. Cheliped fixed finger with three teeth. Chela not separated from propodus insertion............ T. lilljeborgi [NE Atlantic] – Cheliped fixed finger with single distal tooth. Chela ventrally well separated from propodus insertion on carpus by an invagi- nation on propodus forming a neck........................................................................ 5 3. Mandible molar acuminate, with minute terminal spines. Sternal carpal spine on pereopods 2–3 weakly or strongly curved....................................................................................................... 4 – Mandible molar acuminate with pointed tip. Sternal carpal spine on pereopods 2–3 straight........ T. giraffa [SE Australia ] 4. Chela fixed finger with bifid semicircular tooth. Uropod exopod with one article or very weakly two-articled.......................................................................................... T. danica [boreal NE Atlantic] – Chela fixed finger with two unequal teeth, dactylus interlocking. Uropod exopod two-articled.................................................................................................... T. psammophilus [NW Atlantic] 5. Two dorsal, parallel crenulate ridges in addition to marginal ridges on cephalothorax; cheliped propodus with inner comb of dendritic spines........................................................... T. microthymus [E Mediterranean] – Crenulate ridges on cephalothorax margins only; cheliped propodus with inner comb of simple spines...................................................................................... T. bamberi sp. nov. [Iberian NE Atlantic]