The new deep-sea families Cebocaridae fam. nov., Cyclocaridae fam. nov. and Thoriellidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) Author Lowry, J. K. Author Stoddart, H. E. text Zootaxa 2011 2011-01-24 2747 1 53 68 https://biotaxa.org/Zootaxa/article/view/zootaxa.2747.1.4 journal article 10.11646/zootaxa.2747.1.4 1175-5326 5291255 Key to Genera of Cebocaridae 1. Urosomites 1–3 free................................................................................... 2 – Urosomites 2 and 3 fused................................................................. Crybelocyphocaris 2. Pereopod 7 basis expanded posteriorly..................................................................... 3 – Pereopod 7 basis linear..................................................................... Cyphocarioides 3. Uropod 3 rami subequal in length........................................................................ 4 – Uropod 3 inner ramus shorter than outer ramus.............................................................. 5 4. Mandibular palp present; pereopod 7 simple................................................... Crybelocephalus – Mandibular palp absent; pereopod 7 prehensile.................................................. Mesocyclocaris 5. Telson entire.................................................................................. Cebocaris – Telson cleft.......................................................................................... 6 6. Mandibular palp present, 3-articulate...................................................................... 7 – Mandibular palp vestigial 1- or 2-articulate or absent............................................. Metacyphocaris 7. Antenna 2 flagellum well-developed; mandibular palp large, with setae on posterior margin of articles 2 and 3...................................................................................................... Metacyclocaris – Antenna 2 flagellum very small or vestigial; mandibular palp small, with apical setae only............................ 8 8. Antenna 2 flagellum short; uropod 3 inner ramus slightly shorter than outer ramus...................... Paracyphocaris – Antenna 2 flagellum vestigial (less than 3 articles); uropod 3 inner ramus much shorter than (less than 0.2 ×) outer ramus............................................................................................ Mesocyphocaris