Enterocola clavelinae Chatton & Harant, 1924

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: 193-195

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Enterocola clavelinae Chatton & Harant, 1924


Enterocola clavelinae Chatton & Harant, 1924  

( Fig. 122 View FIG )

Material examined. 7 ♀♀ (MNHN-IU-2014-21538, 1 ♀ dissected) in mycnçclavella nana (Lahille, 1890) MNHN- IT-2008-2064; Roscoff , Atlantic coast of France, no other collection data   .

Supplementary description of female. Body ( Fig. 122A, B View FIG ) eruciform, straight: body length 1.11 mm, maximum width 336 μm (across second pedigerous somite). Cephalosome wider than long, distinctly articulated from metasome. Trunk unsegmented, incorporating fifth pedigerous somite, with 4 distinct dorsal tergites; tergites of second to fourth pedigerous somites bilobed, forming left and right tergal folds ( Fig. 122A View FIG ). First to fourth pedigerous somites each with pair of large interpodal protrusions on ventral surface between left and right legs ( Fig. 122B, I, J View FIG ). Genitoabdomen ( Fig. 122C View FIG ) obscurely 4- or 5-segmented, about half as long as trunk; anal prominence distinct, directed anterodorsally. Caudal rami immediately adjacent to one another, incompletely articulated from anal somite, tapering, about 1.3 times longer than wide (75×58 μm), unarmed, with rounded distal margin.

Rostrum not developed. Antennule ( Fig. 122D View FIG ) narrowing distally, unsegmented, 87×50 μm, armed with 9 small, unequal setae along distal third (5 setule-like). Antenna ( Fig. 122E View FIG ) lamellate, twice as long as wide (145×69 μm), incompletely 2-segmented, with partial articulation on outer (lateral) surface; proximal segment unarmed; distal segment armed with 6 naked setae; medial seta (seta I) shortest, 30 μm long, positioned at midlength of medial margin of distal segment; 5 other setae (setae II-VI) 90, 100, 70, 80, and 82 μm, respectively, from medial to lateral.

Labrum ( Fig. 122F View FIG ) on ventral surface with triangular, sclerotized elevated area in middle, and small spinulose lobe plus elongate, spinulose palp on each side. Mandible very similar to labral palp, elongate, and densely spinulose. Maxillule ( Fig. 122G View FIG ) consisting of precoxa and palp; precoxa comprising endite bearing 1 spinulose seta and about 5 setules, and highly sclerotized, bifurcate distal part; palp palm-like, armed with 6 spinulose setae. Maxilla ( Fig. 122H View FIG ) 2-segmented; proximal segment (syncoxa) with mediodistal endite bearing thick spinulose element; distal segment distally bifurcate, with small, transparent seta proximally on posterior surface. Maxilliped absent.

Legs 1-4 each consisting of 2-segmented protopod and 1-segmented rami; protopods unarmed. Exopods of legs 1, 2 and 3 shorter than endopodal segment, with small claw-like distal tip indistinctly demarcated by rudimentary suture. Exopod of leg 3 evenly tapering ( Fig. 122J View FIG ), slightly longer than endopodal segment, with pointed tip. Leg 1 ( Fig. 122I View FIG ) endopod 1.6 times longer than wide (53×33 μm), with convex outer margin; 2 distal setae equal in length, 83 μm long, 1.57 times longer than endopodal segment. Endopods of legs 2-4 similar in dimensions to that of leg 1, but laterodistal seta about 1.9 times longer than endopodal segment and slightly longer than medial seta.

Leg 5 ( Fig. 122K View FIG ) lamellate, distinctly wider than long (124×185 μm), unarmed, with concave medial surface.

Male. Unknown.

Remarks. Chatton & Harant (1924a) originally described this species based on specimens collected on the Atlantic coast of France. Illg & Dudley (1980) redescribed it and recorded Banyuls-sur-Mer on the Mediterranean coast of France as an additional collection locality. The specimens examined in the present work are identified as b. clavelẚnae because the form of the caudal rami, the antennule and antenna, and the proportional lengths of the antennal setae and the setae on legs 1-4 all are in accord with those illustrated by Illg & Dudley (1980). mycnçclavella nana (reported as Clavelẚna nana in the original description) is the only known ascidian host of this copepod.