New insights gained from museum collections: new deep-sea species of Typhlotanais (Tanaidacea, Typhlotanaidae) from Brazil Author Segadilha, Juliana L. E9DE1623-8562-49C8-9146-76EF9D8BEC88 Laboratório de Carcinologia, Departamento de Invertebrados, Museu Nacional / Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, 20940 - 040, Rio de Janeiro, RJ, Brazil. Programa de Pós-graduação em Ciências Biológicas (Zoologia) do Museu Nacional. julianasegadilha@gmail.com Author Serejo, Cristiana S. A86225AE-51C8-4D01-9D3E-60FB5B1FE85C Laboratório de Carcinologia, Departamento de Invertebrados, Museu Nacional / Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, 20940 - 040, Rio de Janeiro, RJ, Brazil. Programa de Pós-graduação em Ciências Biológicas (Zoologia) do Museu Nacional. csserejo@acd.ufrj.br text European Journal of Taxonomy 2022 2022-05-20 820 1 54 journal article 56295 10.5852/ejt.2022.820.1791 093b6984-c0e6-4c86-ab69-39d669316f3f 2118-9773 6574383 D317A201-A0CA-4371-81A3-A244E727F29F Key to Typhlotanaidae species in the Brazilian coast (neuter and female only) 1. Pereopods 4–6 carpus with prickly tubercles ..................................................................................... ................................................................................................................ 2 ( Typhlotanais Sars, 1882 ) – Pereopods 4–6 carpus without prickly tubercles (with specialized hooks/or variable spines form). 7 2. Pereopods 1–3 coxae without spur ................................................................................................... 3 – Pereopods 1–3 coxae with spur .................................................. Typhlotanais ischnochela sp. nov. 3. Pereopods 1–3 ischium with seta shorter than merus; pereopods 4–6 basis without conspicuous spines ................................................................................................................................................ 4 – Pereopods 1–3 ischium with long seta reaching distal margin of merus; pereopods 4–6 basis with conspicuous spines .......................................................................... Typhlotanais spinibasis sp. nov. 4. Pleotelson distal margin lacking spines ............................................................................................ 5 – Pleotelson distal margin with two strong spines ............................... Typhlotanais priscilae sp. nov. 5. Cheliped basis smooth; pereopod-1 coxa with seta shorter than half of basis length ...................... 6 – Cheliped basis with ventral grooves; pereopod-1 coxa with long seta, longer than half of basis length ............................................................................................... Typhlotanais longiseta sp. nov. 6. Pereopods 2–3 coxae with very long setae reaching half-length of basis; pereopods 4–6 propodus distal setae shorter than dactylus and unguis combined ........... Typhlotanais andradeorum sp. nov. – Pereopods2–3coxae with short setae,less than half of basis;pereopods4–6propodus distal setae longer than dactylus and unguis combined; antenna article-2 globose .. Typhlotanais bolarticulus sp. nov. 7. Pleopods present ............................................................................................................................... 8 – Pleopods absent, pleonites with pair of ventral plumose setae ........................................................... ................................................................... Aremus brasilica Segadilha, Gellert & Błażewicz, 2018 8. Pereopods 4–6 carpus without specialized hooks (with variable spines form) ................................ 9 – Pereopods 4–6 carpus with specialized hooks; unguis with trifurcated tip; body more than 10 × L:W ................................................................... Hamatipeda prolata Segadilha & Błażewicz, 2019 9. Carapace wider than pereonite-6; pereopods 4–6 merus and carpus with circumplumose spines; dactylus and unguis semi-fused ................ Meromonakantha mauri Segadilha & Błażewicz, 2019 – Carapace as wide as pereonite-6; pereopods 2–6 merus and carpus with serrated spines; pereopods 4–6 unguis with bifurcated tip; pereopods 4–6 dactylus not fused with unguis ............................................. 10 ( Paratyphlotanais Kudinova-Pasternak & Pasternak, 1978 ) 10. Cheliped carpus with 9–10 dorsal and 7–8 ventral setae; pereopod-1 coxa with spur present ....................................................... Paratyphlotanais apletos Segadilha & Błażewicz, 2019 – Cheliped carpus with two dorsal and two ventral setae; pereopod-1 coxa without spur .................... .................................................................... Paratyphlotanais bessai Segadilha & Błażewicz, 2019