Two new species of Cryptopontius Giesbrecht, 1899 (Copepoda, Siphonostomatoida Artotrogidae) associated with invertebrates from Northeastern Brazil Author Farias, Amilcar Author Neves, Elizabeth G. Author Johnsson, Rodrigo text Zootaxa 2020 2020-07-13 4810 3 481 494 journal article 9294 10.11646/zootaxa.4810.3.5 86bfc9c3-6acf-4cc2-b1f2-6894aa4333d8 1175-5326 3943951 9620E058-BA9D-4AD9-9567-0C0266B4D709 Key to the species of the genus Cryptopontius 1. Endopod of leg 4 reduced to a single segment ….......................................... C. digitatus Kim, 1996 - Endopod of leg 4 absent …............................................................................. 2 2(1). Antennule with 7 segments proximal to fused ancestral segments IX–XII, with ancestral segments III–IV fused …............................................................................ C. aesthetascus Neves & Johnsson, 2008 - Antennule with less than 7 segments proximal to fused ancestral segments IX–XII ….............................. 3 3(2). Antennule with 5 segments proximal to fused ancestral segments IX–XII, with ancestral segments III–VI fused ….......................................................................................... C. pentadikos sp. nov. - Antennule with less than 5 segments proximal to fused ancestral segments IX–XII...............................… 4 4(3). Female antennule 8-segmented …........................................................................ 5 - Female antennule with more than 8-segmented ….......................................................... 11 5(4). Caudal rami longer than anal somite ….................................................................... 6 - Caudal rami shorter than anal somite ….................................................. C. ricinius Malt, 1991 6(5). Second endopodal segment of leg 1 armed with one or two setae …............................................. 7 - Second endopodal segment of leg 1 unarmed …......................................... C. ignotus (Brady, 1910) 7(6). Second endopodal segment of leg 1 with single seta …....................................................... 8 - Second endopodal segment of leg 1 with two setae …........................................................ 9 8(7). Antennal exopod with single seta …..................................................... C. latus (Brady, 1910) - Antennal exopod with two setae …...................................................... C. minor Stock, 1965 9(7). Third exopodal segment of leg 1 with eight elements......................................................… 10 - Third exopodal segment of leg 1 with seven elements …................................. C. quinquesetus Kim, 1996 10(9). Third endopodal segment of leg 1 with six setae and three setae on the free segment of leg 5................................................................................................ C. expletus Neves & Johnsson, 2008 - Third endopodal segment of leg 1 with five setae and two setae on the free segment of leg 5 ….. C. donghaensis Kim, 1996 11(4) Female antennule 9-segmented …....................................................................... 12 - Female antennule 10-segmented …..................................................................... 24 12 (5). Third exopodal segment of leg 4 with eight elements …...................................................... 13 - Third exopodal segment of leg 4 with nine elements...................................................... …14 13 (12) Free segment of female leg 5 longer than wide, male antennule 9-segmented …............... C. longipes Nicholls, 1944 - Free segment of female leg 5 wider than long, male antennule 10-segmented....................... C. acutus Kim 2007 14(12). Second endopodal segment of leg 1 with two setae …....................................................... 15 - Second endopodal segment of leg 1 with one seta …........................................................ 21 15(14). Maxillule outer lobe with three setae …........................................ C. brevifurcatus ( Giesbrecht, 1895 ) - Maxillule outer lobe with two setae …................................................................... 16 16(15). Maxillule inner lobe with one seta …............................................. C. paracapitalis Nicholls, 1944 - Maxillule inner lobe with more than one seta …............................................................ 17 17(16). Maxillule inner lobe with two setae …................................................................... 18 - Maxillule inner lobe with three setae ….................................................................. 20 18(17). Maxillule inner lobe with two setae and similar in length to outer lobe …........................................ 19 - Maxillule inner lobe with two setae and longer than outer lobe ….......... C. tanacredii Johnsson, Rocha & Boyko, 2002 19(18). Antennal exopod bearing a single terminal seta …................................ C. gracilioides Ummerkutty, 1961 - Antennal exopod bearing two terminal setae …......................................... C. phyllogorgius sp. nov. 20(17). Maxillule inner lobe with three setae and much longer than outer lobe …................. C. brevicaudatus (Brady, 1910) - Maxillule inner lobe with three setae and similar in length to outer lobe …............... C. madeirensis Johnsson, 2001 21(14). Third exopodal segment of leg 1 with eight elements (III+5) …............................ C. proximus Nicholls, 1944 - Third exopodal segment of leg 1 with seven elements (III+4) …............................................... 22 22(21). Third endopodal segment of leg 1 with five setae …....................................... C. gracilis Wilson, 1932 - Third endopodal segment of leg 1 with six setae …......................................................... 23 23(22). Third exopodal segment of leg 2 with III-6; third endopodal segment of leg 2 with 1-5...... … C. tenuis ( Giesbrecht, 1895 ) - Third exopodal segment of leg 2 with IV-5; third endopodal segment of leg 2 with 1-1+I-3 …................................................................................................... C. orientalis Ummerkutty, 1961 24(11). Third exopodal segment of leg 1 with eight elements (III-5) …................................................ 25 - Third exopodal segment of leg 1 with seven elements (III-4) …............................................... 26 25(24). Maxillule outer lobe with three setae; antennal exopod with two setae …........................ C. ascidius Kim, 1996 - Maxillule outer lobe with two setae; antennal exopod with one seta …........................ C. similis Nicholls, 1944 26(24). Siphon reaching between insertion of maxilla and maxilliped …........................ C. capitalis ( Giesbrecht, 1895 ) - Siphon reaching insertion of leg 1 …............................................... C. thorelli ( Giesbrecht, 1895 )