Ascidicola rosea Thorell, 1859

Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, Zootaxa 1, pp. 1-286 : 7-9

Ascidicola rosea Thorell, 1859

( Fig. 1 )

Material examined. 1 ♀ (MNHN-IU-2018-1924) from Ascẚdẚa mentula Müller, 1776; Kristineberg, Sweden, Monniot coll., 1962 . 2 ♀♀ (MNHN-IU-2018-1925) from Ascẚdẚa çblẚqua Alder, 1863; Kristineberg, Sweden, Monniot coll., 1962 ; 2 ♀♀ (MNHN-IU-2018-1926) from AK çblẚqua Kristineberg, Sweden, Monniot coll., 1962 . 3 ♀♀ (MNHN-IU-2018-1927) from Ascẚdẚella aspersa (Müller, 1776), Banyuls, Mediterranean coast of France ; 1 ♀ (MNHN-IU-2018-1928) from AK aspersa, North Sea (56°39.9’N, 01°10.1’W), depth 89 m ; 1 ♀ (MNHN-IU- 2018-1929) from AK aspersa, Mediterranean Sea off Corsica, MEDITS 2016 cruise, RV “L’Europe”, Stn M 16-2 (43°20.98´N, 4°19.64´E), depth 32-33 m, 31 May 2016 . 2 ♀♀ (MNHN-IU-2018-1930) from Ascẚdẚella scabra (Müller, 1776); Kristineberg, Sweden, Monniot coll., 1962. 1 ♀ (MNHN-IU-2018-1931) from Cçrella eumyçta Traustedt, 1882; Port Le Havre, Atlantic coast of France, collected by G. Breton, 2008 . 2 ♀♀ (MNHN-IU-2018-1932) from Cçrella parallelçgramma (Müller, 1776); Kristineberg, Sweden, Monniot coll. , 1962. 1 ♀ (MNHN-IU-2018-1933) from eerdmanẚa mçmus (Savigny, 1816); Red Sea, collected in 19 th Century. 1 ♀ (MNHN-IU-2018-1934) from Mẚcrçcçsmus claudẚcans (Savigny, 1816); Roscoff, Atlantic coast of France, Monniot coll. 8 ♀♀ (MNHN-IU-2018-1935) from Mẚcrçcçsmus sabatẚerẚ Roule, 1885; Banyuls, Mediterranean coast of France ; 25 ♀♀ (MNHN-IU-2018-1936) (1 ♀ dissected and figured) from MK sabatẚerẚ; Banyuls , Mediterranean coast of France . 8 ♀♀ (MNHN-IU-2018-1937) from Mẚcrçcçsmus vulgarẚs Heller , 1877; Banyuls, Mediterranean coast of France ; 1 ♀ (MNHN-IU-2018-1938) from MK vulgarẚs; Naples , Italy . 1 ♀ (MNHN-IU-2018-1939) from mhallusẚa mammẚllata (Cuvier, 1815); Banyuls , Mediterranean coast of France . 1 ♀ (MNHN-IU-2018-1940) from Styela cançpus (Savigny, 1816); Mediterranean Sea, Île Grosse, Banyuls, collected by trawl.

Supplementary description of female. Body length 3.70 mm. Ventral spinose pad between 2 last abdominal somites variously developed, sometimes absent. Caudal ramus about 3.9 times longer than wide (236×60 μm); armed with 5 setae (1 lateral and 4 distal), lateral seta positioned at 42% of ramus length. Antennule, antenna, maxillule, and maxilliped as described by Ooishi (2007a). Mandible ( Fig. 1A ) consisting of coxa and reduced palp; palp 1-segmented, but articulated from unarmed, pedestal-like extension of coxa; free segment of palp armed with 5 setae. Maxilla ( Fig. 1B ) consisting of syncoxa and allobasis; syncoxa bearing 1 endite tipped with 2 setae; proximal seta on endite not articulated at base; allobasis with unarmed inner margin, terminating in claw-like process; armed with 1 spine on anterior surface plus 6 setae (4 proximal and 2 sub-proximal) on outer (ventral) margin;. Leg 6 represented by 2 small setae and 4 small teeth on genital operculum. Armature formula for legs 1-4 as follows:

	Coxa	Basis	Exopod	Endopod
Leg 1	0-0;	1-I	I-0; III, I, III	0-0; 0, III, 1
Leg 2	0-0	1-0	I-0; III, I, III	0-0; I, III, 3
Leg 3	0-0	1-0	I-0; II, I, III	0-1; I, III, 3
Leg 4	0-0	1-0	I-0; II, I, III	0-1; 0, III, 2

Remarks. Ooishi (2007a) thoroughly redescribed Ascẚdẚcçla rçsea. This distinctive species occurs widely in the North and South Atlantic and along the Pacific coast of North America ( Boxshall & Halsey, 2004). Boxshall & Halsey (2004) listed 25 species of solitary ascidians previously recorded as hosts of AK rçsea. Ooishi (2007a) recorded an additional species, Ascẚdẚa mentula, as host of this copepod, and here we add three more new host species: Ascẚdẚella scabra from the Swedish coast, Styela cançpus from the Mediterranean, and eerdmanẚa mçmus from the Red Sea. Our observations of the A. rçsea material listed above revealed a constant armature formula for legs 1-4; no variation was noted either with host or with locality. The identification of all the above specimens was confirmed by ẚn sẚtu observation of the leg armature.

Figures

FIG. 1. Ascẚdẚcçla rçsea Thorell, 1859, female. A, mandible; B, maxilla; C, leg 1; D, leg 2; E, leg 3; F, leg 4. Scale bars: 0.05 mm.