Gosbia, 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 : 420

Gosbia gen. nov.

Diagnosis (female).Bodysmallandslightlydorsoventrally depressed. Prosome comprising cephalosome and 4- segmented metasome, with pedigeroussomites defined only by dorsal and lateral constrictions: brood pouch small. Free urosome 5-segmented. Caudal ramus armed with 6 setae. Rostrum well-developed. Antennule 8- segmented. Antenna 4-segmented, with 1 large seta on basis representing exopod; endopod 2-segmented with small terminal claw. Mandible with 5 teeth on coxalgnathobase; exopodwith 4 setae; endopod 2- segmented, with 1 seta on first segment and 5 setaeon second. Maxillule with 5 setaeon arthrite; coxal endite and epipodite present, each with 1 seta; basis with 2 setae; exopod and endopod small, with 3 and 2 setae, respectively. Maxilla 4-segmented; syncoxawith 9 setae arranged as 3, 1, 2, and 3; basis with strong claw plus 2 setae; endopod 2-segmentedwith 1 and 4 setae on first and second segments, respectively. Maxilliped unsegmented, armed with 10 medial setae and 1 apical seta. Legs 1–4 with 3-segmented rami. Inner coxal seta absent in legs 1–4. Leg 1 with inner distal spine on basis. Leg 4 without outer element on first exopodal segment. Armature formula for legs 1–4 as follows:

Leg 5 rudimentary, bilobed, with 1 seta on apex of each lobe.

Type species. Gosbia pusilla gen. et sp. nov., by original designation.

Etymology. The generic name Gosbia is an anagram of BIOGAS (Biologie Gascogne) which was a French deep-sea research program. Gender feminine.

Remarks. Bysone Stock, 1967 and Gosbia gen. nov. have similarly reduced setal armature on the mandible and themaxillule, andbothhavearudimentaryleg 5. However, Gosbia gen. nov. can be separated from Bysone and other similar genera, such as Thoracodelphys and Sesir , by the presence of 3-segmented rami in all swimming legs and by the presence of a large seta representing the exopod on the antenna. In Bysone and related genera, the endopods of legs 2–4 are all 2-segmented, and the antenna either lacks any trace of the exopod, or retains only a minute setal vestige.