Bonnierilla eurypodata, 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 : 258

publication ID

https://doi.org/ 10.11646/megataxa.4.1.1

DOI

https://doi.org/10.5281/zenodo.5699811

persistent identifier

https://treatment.plazi.org/id/03C487CB-EE50-3B34-FF4D-FD46FC24F7D7

treatment provided by

Plazi

scientific name

Bonnierilla eurypodata
status

sp. nov.

Bonnierilla eurypodata sp. nov.

( Figs. 172 View FIGURE 172 , 173 View FIGURE 173 )

Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21284 ) anddissectedparatype (♀, figured) from Polycarpa papillata (Sluiter, 1886) , CORAIL 2, DW146, New Caledonia, Chesterfield Plateau (19°37’0.0012’’S, 158°16’16.7952’’E), depth 44 m, B. Richer de Forges-IRD coll., 30 July 1988.

Etymology. The specific name is derived from the Greek eury (=broad) and pod (=a foot) and refers to the relatively broad exopodal segment of leg 5.

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

Descriptionoffemale.Body( Fig.172A View FIGURE 172 )compressed, inflated, 2.45 mm long. Cephalosome well-defined from metasome; metasomeunsegmented. Freeurosome ( Fig. 172B View FIGURE 172 ) stout, 5-segmented. Caudal rami widely separated from each other; each ramus ( Fig. 172C View FIGURE 172 ) fusiform, about 2.8 times longer than wide (110×40 μm) and about 1.3 times longer than anal somite, armed with 6 naked setae; 2 proximal setae as long as width of ramus, located at 40 and 64% of ramus length; distal 4 setae shorter than width of ramus.

Rostrum ( Fig. 172D View FIGURE 172 ) widerthan long, strongly tapering, withrounded apex. Antennule ( Fig. 172E View FIGURE 172 ) obscurely 8-segmented; armature formula 3, 15, 9+aesthetasc. 4, 3+aesthetasc, 1, 2+aesthetasc, and 7+aesthetasc; all setae naked; 1 seta on second segment rod-shaped. Antenna ( Fig. 172F View FIGURE 172 ) 4-segmented; coxa unarmed; basis with 2 minute vestigial setae distally; first endopodal segment with 1 small seta subdistally; compound distal endopodal segment 3.1 times longer than wide and about 1.5 times longer than first endopodal segment, armed with 8 setae (distal 3 blunt at tip) plus strongly curved terminal claw, less than half length of segment.

Labrum ( Fig. 172G View FIGURE 172 ) with patches of setules posterolaterally and spinules on posteromedian lobe. Mandible ( Fig. 172H View FIGURE 172 ) bearing 5 teeth on coxal gnathobase and 3 needle-like spinules between distal second and third teeth; palp armed as usual: 1 seta on basis, 5 on exopod, 4 on first endopodal segment and 9 on second. Paragnath ( Fig. 173A View FIGURE 173 ) with large dentiform process apically. Maxillule ( Fig. 172I View FIGURE 172 ) not specialized, armedwith 9 setae on arthrite, 1 on coxal endite, 2 on coxal epipodite, 3 on basis, 4 each on exopod and endopod. Maxilla ( Fig. 172J View FIGURE 172 ) 5-segmented; syncoxawith 8 setae (3, 1, 2, and 2); basis with claw bearing setules on both margins, plus 1 seta and 1 rudimentaryseta; endopodwith 1, 1, and 3 setaeonfirst to third segments, respectively. Maxilliped ( Fig. 173B View FIGURE 173 ) incompletely 2-segmented with 10 setaeonfirst segment and 2 setaeon second.

Legs 1–4 ( Fig. 173 View FIGURE 173 C-F) with 3-segmented rami. Inner coxal seta absent in legs 1 and 2, but present in legs 3 and 4. Outer seta on basis large and plumose in leg 1 but small and naked in legs 2–4. Inner distal spine on basis of leg 1 naked, 49 μm long, extending beyond distal border of first endopodal segment. Exopods of legs 2–4 each about 1.8 times longerthan endopods. First and second exopodal segments of legs 2–4 lacking outer spines or with rudimentary spines. Third exopodal segment of legs 2–4 bearing only 2 spines; with inner setae naked. Third exopodal segment of leg 2 with 2 spines and 5 setae (armature formula I, I, 5) in holotype, but abnormally with 2 spines and 4 setae (armature formula I, I, 4; Fig. 173D View FIGURE 173 ) in dissected specimen. Armature formula for legs 1–4 as follows:

Leg 5 ( Fig. 173G View FIGURE 173 ) 2-segmented; coxa short with naked outer distal seta and row of minute spinules at inner distal region; exopodal segment stout, about 2.3 times longerthan wide (173×76 μm) and abruptly narrowing in distal quarter; armed with naked apical seta; 4 rows of minute spinules present on inner margin.

Male. Unknown.

Remarks. Bonnierilla eurypodata sp. nov. is a typical form of Bonnierilla and is similar to B. iboensis sp. nov. and B. reniformis sp. nov., both described above. The most obvious differences between B. eurypodata sp. nov. and these other two species are in the dimensions of the caudal ramus and the exopod of leg 5 in the female. The caudal ramus of B. eurypodata sp. nov. is about 2.8 times longer than wide (110×40 μm) in contrast to 4.6 timeslongerthan wide (206×45 μm) in B. iboensis sp. nov. and 3.4 timeslongerthan wide (211×63 μm) in B. reniformis sp. nov. The exopod of leg 5 of B. eurypodata sp. nov. is 2.3 times longer than wide (173×76 μm), with a single apical seta, in contrast to 2.5 times longer than wide (136×55 μm) in B. iboensis sp. nov. and 2.7 times longerthanwide (203×74 μm) in B. reniformis sp. nov., with 2 unequal distal setae in the latter two species. These differences are robust and support the establishment of the new species.

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