Nobinerilla, 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 : 278-279

Nobinerilla gen. nov.

Diagnosis. Body form as in Bonnierilla , but generally smaller. Prosome consisting of cephalosome and unsegmented metasome forming brood pouch, usually with 2 pairs of wings (derived from epimera of second and third pedigerous somites). Fifth pedigerous somite fused with metasome. Freeurosome 5-segmented, consistingof genitalsomiteand 4-segmented abdomen. Caudalramus with 6 setae. Rostrum short, stronglytapering. Antennule 7- to 9-segmented with 3 setaeonfirst segment. Antenna 4-segmented; compound distal endopodal segment not elongate, similar in length to first segment. Mandible with 5 setaeon exopod; endopod 2-segmented with 4 setaeon first segment and less than 8 setae on second. Maxillule with 9 setae on arthrite, 1 on coxal endite, 2 on epipodite, 3 on basis, 4 onexopodand 3 or 4 on endopod. Maxilla 5-segmented; first endite of syncoxawith 3 or 2 setae; endopod 3-segmented, with 1, 1, and 2 setae on first to third segments, respectively. Maxilliped 1-segmented, lacking distal prolongation, armed with 8 to 10 medial setae and single apical seta. Legs 1–4 with 3-segmented rami. Inner coxal seta absent in legs 1 and 2, and usually absent in leg 4. Legs 2–4 asymmetrical between left and right sides; setae on third exopodal segment of right legs blunt and shorter than those of left legs. Inner seta generally absent on first and second endopodal segments of leg 4. Leg 5 consistingof protopodal plate (fused left and right protopods) and free exopod bearing 1 or 2 setae. Generally associated with compound ascidians.

Type species. Nobinerilla alata gen. et sp. nov. by original designation.

Other included species. Nobinerilla filipes ( Stock, 1967) comb. nov., N. armata ( Schellenberg, 1922) comb. nov., N. exilipes gen. etsp. nov. N. mammillata gen. et sp. nov., N. ovata gen. etsp. nov., N. minuta gen. etsp. nov., and N. pauciseta gen. etsp. nov.

Etymology. The generic name is an anagram of Bonnierilla , which is closely related to the new genus.

Remarks. The new genus is similarto Bonnierilla but differs in the following character states: (1) the metasome usually has 2 pairs of defined epimera; (2) the compound distal endopodal segment of the antenna is stout and is not distinctly longer than the first endopodal segment; (3) the second endopodal segment of the mandible is armed with less than 8 setae; (4) the third endopodal segment of the maxilla has only 2 setae; (5) the maxilliped is 1-segmented, without a distal prolongation, and is armed with 1 apical seta; (6) the exopods of legs 2–4 have setae as outer armature elements; (7) the first exopodal segment of leg 4 lacks an inner seta; and (8) the left and right legs of leg pairs 2-4 are usually asymmetrical ( Table 5). In addition, the third endopodal segment of leg 1 is armed with 5 setae in the new genus, but a few species of Bonnierilla also have 5 setae rather than the more typical 6 setae.

Two species currently placed in Bonnierilla , B. filipes Stock, 1967 and B. armata Schellenberg, 1922 , are recognized as belonging to the new genus and are formally transferred below. Speciesof Nobinerilla gen. nov. usually live in colonial ascidians whereas species of Bonnierilla inhabit solitary ascidians.