Prodoroixys Kim & Boxshall 2020, gen. nov.
Prodoroixys gen. nov. Diagnosis. Body form as in Doroixys, stout, moderately inflated. Dorsal cephalic shield with or without posterolateralhorn-likeprocesses.Metasomeunsegmented or indistinctly segmented; fifth pedigeroussomite fused with fourth. Freeurosome 5-segmented. Caudalramus with 6 setae. R...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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2020
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| Online Access: | https://zenodo.org/record/5699913 https://doi.org/10.5281/zenodo.5699913 |
| Summary: | Prodoroixys gen. nov. Diagnosis. Body form as in Doroixys, stout, moderately inflated. Dorsal cephalic shield with or without posterolateralhorn-likeprocesses.Metasomeunsegmented or indistinctly segmented; fifth pedigeroussomite fused with fourth. Freeurosome 5-segmented. Caudalramus with 6 setae. Rostrum well-developed. Antennule 9- segmented; first segment armed with 2 setae. Antenna 4-segmented with 2-segmented endopod. Mandible with broadened medial margin of coxal gnathobase bearing 5 or 6 teeth; exopodwith 5 setae; endopodwith 1 seta on first segment and 5 to 7 setae on second. Maxillule with 9 or 10 setae on arthrite, 1 each on coxal endite and epipodite, 2 on basis, 4 onexopodand 3 on endopod. Maxilla 5-segmented; syncoxawith 3, 1, 2, and 3 setae on first to fourth endites, respectively; basis with claw plus 2 setae; endopod 3-segmentedwith 1, 1, and 3 (or 4) setae on first to third segments, respectively. Maxilliped unsegmented, armed with more than 6 setae. Legs 1–3 with 3-segmented rami. Leg 4 with 3-segmented exopod and 2- or 3-segmented endopod. Leg 1 basiswith inner distal spine. First and second segments of exopod and endopod of legs 1 and 2 with inner setae. First endopodal segment of leg 3 also with inner seta. Leg 5 rudimentary. Type species. Prodoroixys antarctica gen. et sp. nov. by original designation. Other included species. Prodoroixys bathybia gen. etsp. nov. [table omitted] Etymology. The name of the new genus is derived from pro (=”before” in Greek) andthegenericname Doroixys, and alludes to the relatively primitive character states exhibited by the new genus in comparison with Doroixys. Gender feminine. Remarks. The new genus is readily separated from Doroixys and Loboixys by the more plesiomorphic state of the armature of the oral appendages. It has 2 setae on the basis of themaxillule (only 1 in Doroixys and Loboixys), a 3-segmented endopod on the maxilla (2-segmented in Doroixys and 1- or 2-segmented in Loboixys), and an inner seta on the first and second segments of the ... |
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