New Prototrochus species of sea cucumber from Australia (Echinodermata: Holothuroidea: Synaptida: Myriotrochidae) Author O’Loughlin, Mark Author Macintosh, Hugh text Zootaxa 2015 3995 1 264 270 journal article 10.11646/zootaxa.3995.1.22 734d5867-9ec2-4964-ac97-c667e885b8be 1175-5326 242854 1AF306D8-59B6-4A78-9B89-D78A46CF9656 Key to the Australasian species of Prototrochus Beljaev & Mironov, 1982 1. Myriotrochid wheel diameters relatively small, not more than 150 µ m............................................ 2 – Myriotrochid wheel diameters relatively large, no smaller than 150 µ m........................................... 4 2. Wheel spokes more than ten (spokes 12–15)........................ P. roniae sp. nov. (Great Australian Bight, 1479 m ) – Wheel spokes fewer than ten............................................................................. 3 3. Teeth around inner rim of wheels at least 27 (teeth 27–34)...... P. robbinsae sp. nov. (off Albany, Western Australia , 772 m ) – Teeth around inner rim of wheels no more than 22 (teeth 18–22).......................................................................... P. staplesi O’Loughlin (in O’Loughlin & VandenSpiegel, 2007 ) (off eastern Victoria, 1119 m ) 4. Teeth around inner rim of wheels 30 and more (teeth 30–34)........................................................................... P. burni O’Loughlin (in O’Loughlin & VandenSpiegel, 2007 ) (off Point Hicks, Victoria, 2900 m ) – Teeth around inner rim of wheels no more than 30............................................................ 5 5. Largest wheel diameters more than 290 µ m (wheel diameters 155–297 µ m)...................................................................................... P. australis ( Beljaev & Mironov, 1981 ) (northern Tasman Sea, 1500) – Largest wheel diameters no more than 250 µ m (wheel diameters 207–243 µ m)........................................................ P. taniae O’Loughlin (in O’Loughlin & VandenSpiegel, 2007 ) (off southern New South Wales , 996 m )