Phyllodicola petiti (Delamare Deboutteville & Laubier, 1960)

Boxshall, Geoff A., O’Reilly, Myles, Sikorski, Andrey & Summerfield, Rebecca, 2019, Mesoparasitic copepods (Copepoda: Cyclopoida) associated with polychaete worms in European seas, Zootaxa 4579 (1), pp. 1-69 : 28-30

Phyllodicola petiti (Delamare Deboutteville & Laubier, 1960)

Syn: Phyllocola petiti Delamare Deboutteville & Laubier, 1960

Norwegian material examined: 1♀ from Eumida ockelmanni Eibye-Jacobsen, 1987 , Veslefrikk, Stn 5-4 (60.7825°N, 02.901°E), depth 175 m, 16 May 1998; collected by A. Sikorski; NHMUK Reg. No. 2015.3013 . 1♀ from E. ockelmanni, Kakshauger, Stn 17-4 (59.7334°N, 02.35689°E), depth = 100 m, 12 June 2000; collected by A. Sikorski; NHMUK Reg. No. 2015.3014 . 1♀ from E. ockelmanni, Oseberg Øst, Stn 2-4 (60.7032°N, 01.9406°E), depth 155 m, 25 May 2004; collected by A. Sikorski; NHMUK Reg. No. 2015.3015 . 1♀ from E. ockelmanni, Oseberg J, Stn 2-5 (60.3571°N, 02.9408°E), depth 100 m, 29 May 2004; collected by A. Sikorski; NHMUK Reg. No. 2015.3016 . 1♀ from E. ockelmanni, Gullfaks Satelitter, Stn F /G1-1 (61.0951°N, 02.277367°E), depth 134 m, 0 2 June 2005; collected by A. Sikorski; NHMUK Reg. No. 2015.3017 . 1♀ from E. ockelmanni , 7982 Gaukvaerøy, Stn Ga 3-2 (68.61698°N, 14.35522°E), depth 38 m, 0 2 December 2015; collected by A. Sikorski; NHMUK Reg. No. 2016.551 . 1♀ from Eumida sanguinea (Örsted, 1843) , 7262 Brettingen C, Stn 2 (63.35525°N, 08.238833°E), depth 91 m, 30 September 2014; collected by A. Sikorski; NHMUK Reg. No. 2017.467 .

British material examined: 1 mature ♀ and 1 juvenile ♀ from E. sanguinea, Irvine Bay , SEPA Stn R2 (55° 33.88’N, 04° 41.65’W), depth 13 m, 29 July 1994. 2 ovigerous ♀♀, 1 juvenile ♀ from E.? ockelmanni, Vidlin Voe , Shetland Mainland , Stn Vid 0A, depth unknown, 25 April 2000 ; collected by P. R. Garwood. 1 juvenile ♀ from E.? ockelmanni , North Sandwick , Yell, Shetland, depth unknown, 24 April 2000 ; collected by P. R. Garwood. 2 juvenile ♀♀ from E. ockelmanni (2 mm body length) Vidlin Voe , Shetland Mainland, Stn 50B, depth unknown, 25 April 2000 ; collected by P. R. Garwood. 2 mature ♀♀, 2 juvenile ♀♀ from E. ockelmanni (1.75 mm body length), Basta Ness , Yell, Shetland, depth unknown, 2000 ; collected by P. R. Garwood. 1 juvenile ♀ from E. ockelmanni , North Havra , Shetland, depth unknown, 2000 ; collected by P. R. Garwood. 2 ovigerous ♀♀ from E. ockelmanni, Collafirth , Shetland Mainland , depth unknown, 30 July 2008 ; collected by P. R. Garwood. 1 ovigerous ♀ from E. ockelmanni, Papa, The Deeps , Shetland, depth unknown, 2000 ; collected by P. R. Garwood. 1 ovigerous ♀, 6 immature ♀♀ from four E. ockelmanni , Shetland, depth unknown ; collected by P. R. Garwood. 1 ♀ from E. ockelmanni, Foreholm, The Deeps , Shetland, depth unknown, 2002 ; collected by P. R. Garwood. NHMUK Reg. Nos 2010.1064-1068. 1 ovigerous ♀ from E. sanguinea, Cloch Point, Firth of Clyde , SEPA Stn CMT7 (55° 56.85’N, 04° 53.65’W), depth 80 m, 14 April 2003 ; collected by M. O’Reilly. 1 mature ♀, 1 juvenile ♀ from Phyllodocidae sp. indet., Eastern English Channel , no collection data. 2 juvenile ♀ from E. ockelmanni , Orkney, Veantrow, SEPA Stn 200mS (59° 04.401’N, 02° 52.178’W), depth 10 m, 14 June 2016 . NHMUK Reg. Nos 2018.139-142 .

Differential diagnosis. As for genus.

Remarks. The new material confirms the majority of the observations made by Laubier (1961). None of the females collected from E. ockelmanni or E. sanguinea in Norwegian waters was ovigerous. The mouthparts ( Fig. 11D, E ) were dissected on an adult female with an ectosoma length of 373 µm. The antennule ( Fig. 11C ) is a tapering unsegmented lobe bearing 14 stout setal elements, which is within the range of setal numbers given by Laubier (1961). Slight differences in reported setation counts probably reflect the difficulty in observing these small structures.

The type host was Eulalia pusilla Örsted, 1843 collected at depths ranging from 25 to 280 m ( Laubier 1961). O’Reilly (2000) reported P. petiti from Scottish waters on three hosts, Phyllodoce rosea (McIntosh, 1877) , Eumida bahusiensis Bergström, 1914 , and E. sanguinea . The common host reported here, E. ockelmanni , is a new host record for this parasite and the depth range for parasitised hosts was 10 to 175 m. All of these hosts belong to the family Phyllodocidae , as does Eteone Savigny, 1818 , the host of the genus Cyclorhiza.

Figures

FIGURE 11. Phyllodicola petiti (Delamare Deboutteville & Laubier, 1960), female. A, ectosoma and proximal part of endosoma; B, genital apertures and copulatory pores (arrowed); ventral; C, antennule; D, antenna; E, maxilliped. Scale bars: A, 200 µm, B, 100 µm, C–E, 25 µm.