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| Asıl Yazarlar: | , |
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| Materyal Türü: | Recurso digital |
| Dil: | |
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Zenodo
2020
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| Konular: | |
| Online Erişim: | https://doi.org/10.5281/zenodo.4591266 |
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İçindekiler:
- <p><b><i>Sympygus</i> gen. nov.</b></p><p><b>Diagnosis</b>. Body of female laterally compressed, <i>Doropygus</i> -shaped, covered with thick exoskeleton. Prosome clearly 5-segmented, comprising cephalosome and 4 pedigerous somites; fourth pedigerous somite forming brood pouch, largely incorporating fifth pedigeroussomite. Freeurosome 5-segmented. Caudal ramus armed with 6 setae. Rostrum short, fused at base. Antennule slender, 9-segmented. Antenna consistingof coxa, basis, and 2-segmented endopod withterminal claw; exopod absent. Mandible with narrow coxal gnathobase bearing 2 teeth; basiswith 1 seta; exopodwith 4 setae; endopod 2-segmented with 4 and 10 setae on first and second segments, respectively. Maxillulewith 8 setae on arthrite; coxa with 2 setae on epipodite, but endite absent; exopod and endopod fused with basis forming complex lacking any subdivision, armed with total of 7 setae. Maxilla 5-segmented; syncoxawith 3, 2, and 2 setae on first to third endites, respectively; basis with 2 setae; endopod 3-segmentedwith 1, 1, and 3 setaeonfirst to third segments, respectively. Maxilliped unsegmented with 5 medial and 2 apical setae. Legs 1–4 segmented and armed as in <i>Doropygus</i>. Leg 4 lacking inner coxal seta and inner setaon first exopodal segment. Leg 5 small, but 2-segmented; armed with 1 setaon protopod and 2 setae on free exopodal segment.</p><p><b>Type species</b>. <i>Sympygus punctatus</i> <b>gen. et sp. nov.</b>, by original designation.</p><p><b>Etymology</b>. The generic name is derived from the Greek <i>sym</i> (=together) and <i>pygus</i>, the ending of many generic names in the family Notodelphyidae. It alludes to the fusion of the basis, exopod and endopod of the maxillule. Gender masculine.</p><p><b>Remarks</b>. The characteristic features of <i>Sympygus</i> <b>gen. nov</b>. are displayed by the maxillule which lacks a coxal endite, and in which the basis, exopod and endopod are all fused to form a single complex. Although this form of maxillule resembles that of <i>Sesir</i> in part, it cannot be placed in <i>Sesir</i> due to the other major differences in body form. In addition, in <i>Sesir</i> both the coxal endite and the epipodite are lacking from the maxillule, whereas the new genus retains a normal epipodite with 2 setae, and the armature of legs 1–5 is reduced in <i>Sesir</i>, but not in <i>Sympygus</i> <b>gen. nov</b>.</p><p>In the Notodelphyidae the fusion of the exopod, the endopod, or both rami with the basis of the maxillule has been reported in several other genera, including <i>Demoixys</i> Illg & Dudley, 1961, <i>Mesoixys</i> Illg & Dudley, 1965, and <i>Paralobodelphys</i> Gotto, 1981. However, <i>Sympygus</i> <b>gen. nov</b>. is not related to these genera because they have an inflated or globular body form, the segmentation and setation of swimming legs are significantly reduced, and leg 5 is vestigial or absent.</p>