Bonnierilla similis Illg & Dudley 1961
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Copepoda
Cyclopoida
Notodelphyidae
Bonnierilla
Bonnierilla similis

description: Bonnierilla similis Illg & Dudley, 1961
(Figs. 165, 166)
Material examined. 6 ♀♀ (MNHN-IU-2018-1840) and 1 dissected ♀ (figured) from Pyura microcosmus (Savigny, 1816), Taureau, Roscoff, France.
Description of female. Body (Fig. 165A) compressed, 2.58 mm long. Cephalosome produced into blunt projections at posterolateral corners of dorsal shield. Metasome consisting of well-defined first to fourth pedigerous somites in unexpanded specimen; greatest dorsoventral depth of metasome 0.55 mm. Free urosome 5-segmented: 4 abdominal somites becoming gradually shorter and narrower posteriorly. Caudal ramus (Fig. 165B) elongate, slightlycurvedventrally, gradually narrowing distally and 4.8 times longerthan wide (226×47 μm); armed with 6 naked setae, outer lateral and dorsal setae located at 37 and 58% of ramus length, respectively; longest distal seta about 0.35 times as long as ramus.
Rostrum (Fig. 165C) longerthanwide, tapering. Antennule 8-segmented; first and second segments much broader than distal 6 segments; setation not elucidated due to damage to specimens. Antenna (Fig. 165D) 4- segmented; last segment (compound distal endopodal segment) forming broad, rounded subdistal tubercle armed with 3 setae, distal margin with 5 setae, 3 equal in length, broad, rod-shaped, and fused at base (Fig. 165E); terminal claw short and stout.
Labrum not examined. Mandible (Fig. 165F) 5 teeth, 1 subsidiary tooth between distal first and second teeth; basiswith 1 medial seta; exopod with3 longproximal setae and 2 unequal, shorter setae distally; endopod obscurely articulated with basis, armedwith 4 and 9 setaeon first and second segments, respectively. Paragnath (Fig. 165G) with large, claw-like apical process. Maxillule (Fig. 165H) as usual for genus, but arthrite bearing 10 setae; seta on coxal endite broad; proximal seta on basis much shorter than distal 2. Maxilla (Fig. 165I) also as usual for genus; 9 setae on syncoxa arranged as 3, 1, 2, and 3; claw on basis finely spinulose along both margins; 3 endopodal segments with 1, 1, and 3 setae, respectively. Maxilliped (Fig. 165J) incompletely 2-segmentedwith 10 setaeon first segment and 2 unequal setae on second.
CoxaBasisExopodEndopodLeg 10-01-II-1; I-1; III, I, 40-1; 0-1; 1, 2, 2Leg 20-01-0I-1; I-1; III, I, 50-1; 0-2; 1, 2, 3Leg 30-11-0I-1; I-1; III, I, 50-1; 0-2; 1, 2, 3Leg 40-11-0I-1; I-1; II, I, 50-1; 0-2; 1, 2, 2
Legs 1–4 with 3-segmented rami (Fig. 165K, 166A, B). Inner coxal seta absent in legs 1 and 2, but large seta present in legs 3 and 4. Outer setaon basis slightly shorter than exopod in leg 1 and very small in legs 2–4. Inner distal spine on basis of leg 1 slightly longer than first endopodal segment. Exopod twice as long as endopod in legs 2 and 3, and about 2.4 timeslongerthan endopod in leg 4. Outerspinesonexopods of legs 2–4 very small, mostly rudimentary. Armature formula for legs 1–4 as follows:
Leg 5 (Fig. 166C, D) comprising short protopod and free exopod; protopod withnaked outerdistal seta; exopod with naked setaon apex plus 3 or 4 groups of spinules on inner margin; in dissected specimen left exopod more slender than right, 4.24 times longer than wide (144×34 μm); right exopod 3.68 times longerthan wide (140×38 μm): apical seta slightly shorter than exopodal segment.
Male. Unknown.
Remarks. This species has a characteristic feature that serves to differentiate it from all of its congeners, the 3 strong rod-shaped distal setae on the distal margin of the antenna. Originally this species was reported from Pyura squamulosa Alder, 1863 collected on the Mediterranean coast of France (Illg & Dudley, 1961). Holmes & Gotto (1987) subsequently reported it from Irish waters.
description: Published as part of Kim, Il-Hoi & Boxshall, Geoff A., 2020, Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata), pp. 1-6 in Megataxa 4 (1) on pages 247-249, DOI: 10.11646/megataxa.4.1.1, http://zenodo.org/record/4591138