Caligus evelynae Suárez-Morales, Camisotti & Martín 2012

Body shape as shown in Fig. 1A, with cephalic shield ellipsoidal with curved lateral margins. Total length 2.55 mm, greatest width 1.1 mm (measured at widest part of cephalothorax). Cephalothorax comprises more than half total length (1.33 mm). Genital complex longer than wide (1.2 x 0.71 mm) with irregularly undulated outer margins and rugged ventral and dorsal surfaces; posterolateral region protruding posteriorly. Abdomen subquadrate, about as long as wide, genital complex approximately 3.4 times longer than abdomen. Caudal rami subrectangular about 1.2 times longer than wide, armed with 3 long terminal, one small outer and one small inner pinnate setae (Fig. 2I). Lunules spaced by the length of about 1.5 times the lunule diameter. Antennule (Fig. 1C) with the usual structure found in Caligus, 2-segmented, proximal segment distinctly longer than distal segment, armed with 22 plumose setae. Distal segment bearing 12 setae (1 of which is subdistal) plus two aesthetascs. Antenna (Fig. 1D) claw recurved at right angle near tip with small, proximal accessory process; posterior process heavily sclerotized, pointed, but not sharply so. Postantennal process (Fig. 1Eb) sickle-shaped, with rounded tip, with two basal papillae, proximalmost armed with three setae, the other with a single, branched seta. Another papilla with two setae located nearby on sternum. Maxillule represented by bluntly pointed subtriangular process and basal papilla bearing three small setae (Fig. 1Ea). Maxilla (Figs 1F, G) 2-segmented, brachiform; proximal segment (lacertus) unarmed; distal segment (brachium) slender, with subdistal flabellum on outer margin. Terminal elements, calamus and canna unequally long, the latter about half the length of the former. Maxilliped (Fig. 1H) robust, without protrusions in basal region; subchela about one-half length of basal segment. Terminal claw slightly shorter than shaft, armed with short proximal seta. Sternal furca (Fig. 1B) tines slightly incurved, membranous on outer margin and longer than base. Leg 1 (Fig. 2A) coxa with patch of very fine spinules in addition to long setulated outer seta and short inner seta. Mammiliform papilla on distal position of segment. First exopodal segment with row of short hair-like elements. Last exopod segment bearing 3 medial pinnate setae and 2 terminal spines, each with accessory process, with additional medial distal seta; usual small seta on outer terminal corner not seen (Fig. 2B). Leg 2 (Fig. 2C) coxa small, with long plumose seta on inner margin and setule-bearing papilla on middle-outer surface. Basipodite robust, with small seta on outer edge and a setule-bearing papilla on middle inner margin. First exopodal segment bearing spine reaching across second segment to proximal margin of third segment; second segment with much shorter spine recurved on outer margin, spine reaching to middle of last segment. Distal segment with short spine on outer margin plus one short setule. Terminal spine sclerotized, articulated, as long as distal segment (Fig. 2D). All setae on medial margins of all segments pinnate. Leg 3 (Fig. 2E) exopod first segment with stout, slightly recurved, terminal spine with thin flange on outer lateral margin nearly reaching to third segment; setae as in figure and typical of genus; second endopodal segment with single inner pinnate seta, second segment with 6 pinnate setae. Leg 4 (Figs 2 F, G) uniramous, brachiform; exopod 2-segmented. Protopod with short plumose seta in distal outer margin. First exopodal segment with terminal seta not reaching base of middle lateral seta of last segment. Second exopodal segment bearing 3 unequally long setae, outermost shortest and medial longest; each with pecten at base. Armature of rami of legs 1–4 as follows (Roman numerals indicating spines and Arabic numerals, setae): exopod endopod Leg 1 1-0; III, 4 vestigial Leg 2 I-1; I-1; II, 5 0-1; 0-2; 6 Leg 3 I-0; I-1; III, 4 0-1; 6 Leg 4 I-0; I, III absent Leg 5 represented by two small papillae on posterolateral corner of genital complex, one armed with two setae, the other with one seta (arrowed in Fig. 1A, Fig. 2H).