Nobinerilla filipes ( Stock, 1967 ) Kim & Boxshall, 2020

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), Megataxa 4 (1), pp. 1-6 : 279-282

Nobinerilla filipes ( Stock, 1967) comb. nov.

( Figs. 188 , 189 )

Syn.: Bonnierilla filipes Stock, 1967

Bonnierilla armata sensu Illg & Dudley, 1961: 61 , figs. 19. 20. Non Bonnierilla armata Schellenberg, 1922 .

Material examined. 1 ♀ (dissected and figured) from Dendrodoa grossularia (Van Beneden, 1846) , Portugal; 1 ♀ (dissected) from Ascidia iberica Monniot C. & Monniot F., 1988 , Seamount 1 DW 0, (36°32.0 Ń, 11°37.9 Ẃ), Banc de Gorringe, depth 180 m 22 September 1987.

Descriptionoffemale.Body( Fig.188A )compressed, 2.55 mm long. Prosome 1.81 mm long, comprising small, clearly defined cephalosome and unsegmented, expanded metasome,0.96mmindorsoventraldepth.Fifthpedigerous somite fused with metasome. Free urosome ( Fig. 188B ) 5- segmented: genital somite short, 80×290 μm; 4 abdominal somites 189×290, 153×269, 109×229, and 102×204 μm, respectively. Anal operculum large. Caudal rami widely separated from each other; each ramus ( Fig. 188C ) about 3.1 times longer than wide (171×55 μm): armed with 6 naked setae; longest distal seta about half as long as ramus; outer lateral and dorsal setae positioned at 48 and 69% of ramus length, respectively.

Rostrum ( Fig. 188D ) aslongas wide, strongly tapering towards blunt apex. Antennule ( Fig. 188E ) 276 μm long and 7-segmented; armature formula 3, 16, 9, 4, 2+aesthetasc, 4+aesthetasc, and 7+aesthetasc; sixth segmentwithsubdivisionin middle; 2 pinnatesetae onfirst segment and 1 each on second and fifth, sixth and seventh segments. Antenna ( Fig. 188F ) slender, 4-segmented; coxa short and unarmed; basis more than twice as long as wide and unarmed; first endopodal segment about 1.6 timeslongerthan wide (90×56 μm), with 1 setaon medial side; compound distal endopodal segment about 3.6 times longer than wide (127×35 μm); armed with 7 setae plus small terminal claw, less than half as long as segment.

	Coxa	Basis	Exopod	Endopod
Leg 1	0-0	1-0	I-1; I-0; III, I, 4	0-1; 0-1; 1, 2, 2
Leg 2	0-0	1-0	1-1; 1-1; 3, 1, 5	0-1; 0-2; 1, 2, 3
Leg 3	0-1	1-0	1-1; 1-1; 2, 1, 5	0-1; 0-2; 1, 2, 3
Leg 4	0-1	1-0	1-1; 1-1; 2, 1, 5	0-1; 0-2; 1, 2, 2

Labrum ( Fig.188G ) withlarge, setuloseposteromedial lobe and setulose posterior region. Mandible ( Fig. 188H ) with 5 teeth and 1 proximal seta on coxal gnathobase; basiswith 1 small seta on medial margin; exopod 2- segmented with 3 and 2 setae on first and second segments, respectively; outer distal seta on second segment shorter than other 4 setae; endopod with 4 and 5 setaeon first and second segments, respectively; second endopodal segment small and distinctly narrower than first. Paragnath ( Fig. 188J ) ornamented with 2 dentiform processes apically and setules on medial margin. Maxillule ( Fig. 188I ) with 9 setaeon arthrite, 1 on coxal endite, 2 on epipodite, 4 on exopod, 3 each on basis and endopod; endopodal segment much smaller than exopodal segment. Maxilla ( Fig. 188K ) 5-segmented; syncoxa with 3, 1, 2, and 3 setae on first to fourth endites, respectively; basis with smooth claw plus 1 seta; endopodwith 1,1, and2 setaeon firsttothird segments, respectively. Maxilliped ( Fig. 189A ) unsegmented with 10 medial setae and 1 outer distal seta.

Leg 1 ( Fig. 189B ) with 3-segmented rami. Coxa lacking inner seta. Outersetaon basis large, slightlylonger than exopod; basis lacking innerdistal spine. Second exopodal segment lacking inner seta. Four inner setae on third exopodalsegment small and naked. Endopod slender with small inner setae, but with 3 enlarged distal setae on thirdsegment.

Legs 2–4 ( Fig. 189 C-E) with 3-segmented rami. Inner coxal seta absent in leg 2, but present, small and naked in left legs 3 and 4, smaller or absentin right legs 3 and 4. Outer seta on basis small and naked in legs 2–4. Exopod 1.8 timeslongerthan endopod inleg 2, about 1.5 times longer in leg 3, and 1.4 times longer in leg 4. All exopodal segments of legs 2–4 bearing slender, naked setae (not spines) on outer margin. Setae on third exopodal segment of right legs 2–4 shorter than those of left legs. Three inner distal setae on third exopodal segment of legs 2–4 much smaller than adjacent proximal and distal setae. First and second endopodal segments with weakly bilobed distal margin densely ornamented with spinules. Third endopodal segment of legs 3 and 4 elongated, longer than firstandsecondsegments combined, 4.3 and 4.5 times longerthan wide in legs 3 and 4, respectively. Armature formula for legs 1–4 as follows:

Leg 5 ( Fig. 189F ) withshort protopodbearing pinnate outer distal seta and 1 or 2 patches of minute spinules near base of exopod. Exopodal segment markedly elongate, 6.3 times longerthan wide (258×41 μm); 5.9 times longer than wide (295×50 μm) in specimen from Ascidia iberica ; armed with 1 short distal and 1 long outer subdistal pinnate seta and ornamented with 7 to 10 rows of minute spinules on inner surface. Two setae on exopod of right leg 5 shorter than those of left leg 5.

Male. Unknown.

Remarks. Nobinerilla filipes ( Stock, 1967) comb. nov. is very similar to B. armata and both species are recognized as belonging to the new genus. Bonnierilla armata ishere transferred to the new genus, as Nobinerilla armata ( Schellenberg, 1922) comb. nov. Both species share the possession of 3 setae on the endopod of the maxillule, the lack of the inner distal spine on the basis of leg 1 and of an inner seta on the second exopodal segment of leg 1, and both species have an elongate exopodal segment on leg 5. Stock (1967) pointed out two noticeable differences between them: in N. armata the cephalosome forms a spatulate extension at each posterolateral corner and it possesses 3 setae on the exopod of leg 5. However, the latter feature is questionable even though the figure of Schellenberg (1922) showed 3 setae, because the free exopodal segment of leg 5 is known to carry a maximum of 2 setae in all other notodelphyid copepods, including all the relatively basal genera. We consider it likely that Schellenberg’s figure was erroneous.

Figures

FIGURE 188. Nobinerilla filipes (Stock, 1967) n. comb., female. A, habitus, right; B, urosome, ventral; C, caudal ramus, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, paragnath; K, maxilla. Scale bars: A, 0.5 mm; B, 0.1 mm; C–K, 0.05 mm.

FIGURE 189. Nobinerilla filipes (Stock, 1967) n. comb., female. A, maxilliped; B, leg 1; C, left leg 2; D, left leg 3; E, left leg 4; F, leg 5. Scale bars: A, B, 0.05 mm; C–F, 0.1 mm.