Anomoclausia indrehusae Gotto, 1964

Kim, Il-Hoi, Sikorski, Andrey, O’Reilly, Myles & Boxshall, Geoff A., 2013, Copepods associated with polychaete worms in European seas, Zootaxa 3651 (1), pp. 1-62 : 5-6

publication ID	https://doi.org/ 10.11646/zootaxa.3651.1.1
publication LSID	lsid:zoobank.org:pub:2E9DC61F-00B8-42CF-BBB0-41651072F38C
persistent identifier	https://treatment.plazi.org/id/F473E52C-1C42-BB73-059F-FAB9202FEC74
treatment provided by	Felipe
scientific name	Anomoclausia indrehusae Gotto, 1964
status

Treatment

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 GoogleMaps .

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 GoogleMaps .

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 GoogleMaps .

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 GoogleMaps .

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 GoogleMaps .

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 GoogleMaps .

1 ♀ from P. paucibranchiata, Vigdis, Stn 25-3 (61.384ºN, 2.141ºE), depth 287 m, 02 June 1999; BMNH Reg. No. 2012.1367 GoogleMaps .

1 ♀ from P. paucibranchiata, Regional, Stn 11-3 (61.2354ºN, 2.6396ºE), depth 313 m, 27 May 1999; BMNH Reg. No. 2012.1368 GoogleMaps .

Female. Body ( Fig. 1A, B View FIGURE 1 ) 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 View FIGURE 1 ). Genital double-somite and abdominal somites directed posteroventrally ( Fig. 1B View FIGURE 1 ). 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 View FIGURE 1 ). 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 View FIGURE 1 ), 80×29 µm (ratio 2.76:1); each ramus ( Fig. 1E View FIGURE 1 ) with 7 setae including 1 minute outer proximal seta (seta I). Egg sac ( Fig. 1F View FIGURE 1 ) 140 µm wide and longer than body, with multiseriate eggs.

Rostrum forming Y-shaped mid-ventral ridge. Antennule ( Fig. 1G View FIGURE 1 ) 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 View FIGURE 1 ) 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 View FIGURE 2 ) with broadly concave posterior margin flanged with membrane. Mandible ( Fig. 2B View FIGURE 2 ) with 3 blade-like elements, distal blade articulated at base. Paragnath not recognized. Maxillule ( Fig. 2C View FIGURE 2 ) weakly bilobed, with 2 apical setae on each lobe. Maxilla ( Fig. 2D View FIGURE 2 ) 2-segmented, but segmentation incompletely expressed; proximal segment smooth; distal segment digitiform and ornamented with spinules on ventral surface. Maxilliped ( Fig. 2E View FIGURE 2 ) 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 View FIGURE 2 ) with strong inner spine on basis. Leg 2 ( Fig. 2G View FIGURE 2 ) 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 View FIGURE 2 ) rotated, as indicated by outer lateral seta being located posteriorly ( Fig. 1C View FIGURE 1 ), 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 View FIGURE 1 ).

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.

Kingdom	Animalia
Phylum	Arthropoda
Class	Hexanauplia
Order	Cyclopoida
Family	Anomoclausiidae
Genus	Anomoclausia