Bonnierilla similis Illg & Dudley, 1961
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publication ID |
https://doi.org/ 10.11646/megataxa.4.1.1 |
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DOI |
https://doi.org/10.5281/zenodo.5699807 |
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persistent identifier |
https://treatment.plazi.org/id/03C487CB-EFA7-3ACC-FCEF-FB23FD73FE8E |
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treatment provided by |
Plazi |
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scientific name |
Bonnierilla similis Illg & Dudley, 1961 |
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Bonnierilla similis Illg & Dudley, 1961
( Figs. 165 View FIGURE 165 , 166 View FIGURE 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 View FIGURE 165 ) 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 View FIGURE 165 ) 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 View FIGURE 165 ) 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 View FIGURE 165 ) 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 View FIGURE 165 ); terminal claw short and stout.
Labrum not examined. Mandible ( Fig. 165F View FIGURE 165 ) 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 View FIGURE 165 ) with large, claw-like apical process. Maxillule ( Fig. 165H View FIGURE 165 ) 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 View FIGURE 165 ) 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 View FIGURE 165 ) incompletely 2-segmentedwith 10 setaeon first segment and 2 unequal setae on second.
| Coxa | Basis | Exopod | Endopod | |
|---|---|---|---|---|
| Leg 1 | 0-0 | 1-I | I-1; I-1; III, I, 4 | 0-1; 0-1; 1, 2, 2 |
| Leg 2 | 0-0 | 1-0 | I-1; I-1; III, I, 5 | 0-1; 0-2; 1, 2, 3 |
| Leg 3 | 0-1 | 1-0 | I-1; I-1; III, I, 5 | 0-1; 0-2; 1, 2, 3 |
| Leg 4 | 0-1 | 1-0 | I-1; I-1; II, I, 5 | 0-1; 0-2; 1, 2, 2 |
Legs 1–4 with 3-segmented rami ( Fig. 165K View FIGURE 165 , 166A, B View FIGURE 166 ). 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 View FIGURE 166 ) 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.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.