Notoixys Kim & Boxshall 2020, gen. nov.
Notoixys gen. nov. Diagnosis. Body inflated, usually with unsegmented, globular metasome. Dorsal cephalic shield expanded ventrolaterally, with paired horn-like processes posterolaterally. Fifth pedigerous somitecompletely fused with fourth. Free urosome 5-segmented. Caudal setae small or absent. Ro...
| Main Authors: | , |
|---|---|
| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2020
|
| Subjects: | |
| Online Access: | https://zenodo.org/record/5730232 https://doi.org/10.5281/zenodo.5730232 |
| Summary: | Notoixys gen. nov. Diagnosis. Body inflated, usually with unsegmented, globular metasome. Dorsal cephalic shield expanded ventrolaterally, with paired horn-like processes posterolaterally. Fifth pedigerous somitecompletely fused with fourth. Free urosome 5-segmented. Caudal setae small or absent. Rostrum well-developed.Antennule 7- to 10-segmented. Antenna 4-segmentedwith 2-segmented endopod bearingsmallterminal claw. Mandiblewith coxal gnathobase bearing narrow medial cutting margin; armed with 1 seta on basis, 5 setae on exopod, 1 seta on first endopodal segment, and 4 to 7 setaeon second. Maxillule armedwith 5 or 6 setaeon arthrite, 1 setaon epipodite, 1 or 2 setaeon basis, 4 setaeon exopod, and 3 setaeon endopod; coxal endite absent. Maxilla 5-segmented with 3-segmented endopod; syncoxa bearing 4 endites; basis with 3 setae (or 2 setae plus claw). Maxilliped as unsegmented lobe bearing 3 to 5 setae. Legs 1–4 biramous; segmentation of rami frequently incompletely expressed. Inner coxal seta present at least in leg 1. Leg 1 with inner distal element on basis; exopod 3-segmented, with inner seta on first and second segments, and 7 or 8 setae on third segment. Leg 2 exopod 3-segmented, with inner seta on first and second segments. Exopods of legs 3 and 4 usually with inner seta on first or second, or both segments. Endopods of legs 2–4 usually with inner seta on first or second, or both segments. Leg 5 rudimentary or absent. Type species. Notoixys heardensis gen. et sp. nov. by original designation. Other included species. Notoixys hirsuta gen. et sp. nov., N. ovata gen. et sp. nov. and Notoixys planiceps gen. etsp. nov. Etymology. The generic name is derived from the combination of noto (=”south” in Greek) and - ixys, the ending of several existing genera of the Notodelphyidae. The name alludes to the zoogeographic distribution of the new genus in the Antarctic or Southern Ocean. Remarks. Notoixys gen. nov. can be distinguished from Loboixys and Doroixys by the more complex state of the armature on the oral ... |
|---|