Copepods associated with polychaete worms in European seas Author Kim, Il-Hoi Author Sikorski, Andrey Author O’Reilly, Myles Author Boxshall, Geoff A. text Zootaxa 2013 2013-05-14 3651 1 1 62 http://dx.doi.org/10.11646/zootaxa.3651.1.1 journal article 10.11646/zootaxa.3651.1.1 1175-5326 5264661 2E9DC61F-00B8-42CF-BBB0-41651072F38C Anomoclausia indrehusae Gotto, 1964 Anomoclausia indrehusae Gotto, 1964: 221 , figs. 1–17. Material examined: 1 ♀ from Pseudopolydora paucibranchiata , Kvitebjørn gas and condensate field, Stn 2-3 ( 61.076ºN , 2.504ºE ), depth 189 m , 01 June 2005 ; BMNH Reg. No. 2012.1361 . 1 ♀ from P. paucibranchiata , Statfjord Nord, Stn SFNORD 99, SFNF 4-4 ( 61.431ºN , 1.981ºE ), depth 280 m , 11 June 1999 ; BMNH Reg. No. 2012.1362 . 1 ♀ from P. paucibranchiata , Statfjord Nord, Stn SFNORD 99, 8-9 ( 61.482ºN , 1.852ºE ), depth 266 m , 08 June 1999 ; BMNH Reg. No. 2012.1363 . 1 ♀ from P. paucibranchiata , Statfjord Nord, Stn SFNORD 99, SFNF 5-4 ( 61.431ºN , 1.917ºE ), depth 255 m , 12 June 1999 ; BMNH Reg. No. 2012.1364 . 1 ♀ from P. paucibranchiata , Statfjord Nord, Stn SFNORD 99, SFNF 4-5 ( 61.431ºN , 1.981ºE ), depth 280 m , 11 June 1999 ; BMNH Reg. No. 2012.1365 . 2 ♀ ( 1 ♀ dissected), from P. paucibranchiata , Statfjord Nord, Stn SFNORD, SFNF 7-3 ( 61.438ºN , 1.932ºE ), depth 271 m , 12 June 1999 ; BMNH Reg. No. 2012.1366 . 1 ♀ from P. paucibranchiata , Vigdis, Stn 25-3 ( 61.384ºN , 2.141ºE ), depth 287 m , 02 June 1999 ; BMNH Reg. No. 2012.1367 . 1 ♀ from P. paucibranchiata , Regional, Stn 11-3 ( 61.2354ºN , 2.6396ºE ), depth 313 m , 27 May 1999 ; BMNH Reg. No. 2012.1368 . Female . Body ( Fig. 1A, B ) cylindrical and consisting of cephalothorax, second to fifth pedigerous somites, genital double-somite and 2-segmented abdomen. Body length 1.90 mm long excluding caudal setae. Prosomeurosome division indistinct. Metasomal somites separated from adjacent somites only by weak constrictions. Cephalothorax 480×410 µm, wider than metasomal somites, narrowing anteriorly, with truncate frontal margin and convex lateral margins. Fifth pedigerous somite with paired pointed posterolateral processes ( Fig. 1C ). Genital double-somite and abdominal somites directed posteroventrally ( Fig. 1B ). Genital double-somite with paired pointed lateral processes posterior to genital apertures. Genital double- and first free abdominal somites each with 3 hyaline chitinous flaps located laterally near posterior margin ( Fig. 1D ). Genital areas located dorsally. Anal somite about twice as long as preceding somite and unornamented. Caudal rami very widely separated from each other ( Fig. 1C ), 80×29 µm (ratio 2.76:1); each ramus ( Fig. 1E ) with 7 setae including 1 minute outer proximal seta (seta I). Egg sac ( Fig. 1F ) 140 µm wide and longer than body, with multiseriate eggs. Rostrum forming Y-shaped mid-ventral ridge. Antennule ( Fig. 1G ) small and 7-segmented; armature formula 2+spine, 6+spine; 5, 2+aesthetasc, 2, 2+aesthetasc, and 7+aesthetasc; all setae naked. Antenna ( Fig. 1H ) 4- segmented; armature formula 1, 1, 4, and 5+spine; second segment with 2 acute mediodistal processes; setal element on second segment spiniform; third segment with 3 pointed mediodistal processes; terminal segment 35×14 µm (2.50:1); medial terminal seta much smaller than other 4 setae. Labrum ( Fig. 2A ) with broadly concave posterior margin flanged with membrane. Mandible ( Fig. 2B ) with 3 blade-like elements, distal blade articulated at base. Paragnath not recognized. Maxillule ( Fig. 2C ) weakly bilobed, with 2 apical setae on each lobe. Maxilla ( Fig. 2D ) 2-segmented, but segmentation incompletely expressed; proximal segment smooth; distal segment digitiform and ornamented with spinules on ventral surface. Maxilliped ( Fig. 2E ) 4-segmented; first and second segments each with 2 unequal mediodistal setae; short third segment unarmed; terminal segment strongly recurved distally, forming pointed hook, armed with 1 proximal and 1 middle seta, and ornamented with patch of minute spinules on distal margin of hook. Legs 1–4 with 3-segmented exopod and 2-segmented endopod; both rami armed only with spines. Leg 1 ( Fig. 2F ) with strong inner spine on basis. Leg 2 ( Fig. 2G ) to leg 4 identical in shape and in armature formula as follows: Leg 1: coxa 0-0; basis 1-I; exopod I-0; I-0; II , I, 0; endopod 0-0; 0, I, 0 Legs 2–4: coxa 0-0; basis 1-0; exopod I-0; I-0; II , I, 0; endopod 0-0; 0, I, 0 Leg 5 ( Fig. 2H ) rotated, as indicated by outer lateral seta being located posteriorly ( Fig. 1C ), 2-segmented but proximal protopodal segment incorporated into somite, with 1 posterior seta; free distal segment (exopod) nearly rectangular, 1.35 times as long as wide, with 3 spines and 1 seta. Leg 6 represented by 2 spines in genital area ( Fig. 1D ). Remarks. The original description of A. indrehusae is partly revised in the above redescription, especially the form and setation of the antennule, antenna, maxilla and maxilliped. In addition, the conical posteromedian protuberance of leg 1, mentioned by Gotto (1964) , is apparently the inner protopodal spine that is usually found in members of the family Clausidiidae . Gotto (1964) speculated that spionid polychaetes might be the most likely hosts of A. indrehusae . The multiple records here from the spionid Pseudopolydora paucibranchiata confirm his suspicions.