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| Asıl Yazarlar: | , |
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| Materyal Türü: | Recurso digital |
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Zenodo
2020
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| Konular: | |
| Online Erişim: | https://doi.org/10.5281/zenodo.5699899 |
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İçindekiler:
- <p><b><i>Doroixys gryphina</i> sp. nov.</b></p><p>(Figs. 316, 317)</p><p><b>Typematerial</b>. Holotype (intact ♀, MNHN-IU-2014- 21368) from <i>Eudistoma reginum</i> Kott, 1990 (MNHN-IT-2008-4187 = MNHNA3/EUD/75), CRRFOCDN 1434-S, Manado, north Sulawesi, Indonesia, depth 60 m, 21 May 1993; 1 paratype ♀ (dissected) from <i>E</i>. <i>reginum</i>, CRRF same locality data, Indonesia.</p><p><b>Etymology</b>. The specific name is derived from the Greek <i>gryp</i> (=hook-nosed), referring to the hook-shaped rostrum.</p><p><b>Descriptionoffemale</b>. Body (Fig. 316A) curved ventrally, 1.39 mm long. Dorsal cephalic shield expanded ventrolaterally; paired posterolateral horn-like processes prominent, bearing 2 nodule-like tubercles subdistally (Fig. 316B). Metasome unsegmented, but with 3 weak constrictions on dorsal and lateral surfaces; third and fourth pedigerous somites containing eggs and nauplii inside. Fourth pedigerous somite expanded, but shorter than anterior part of metasome. Free urosome (Fig. 316C) tapering posteriorly: genital and 4 abdominal somites 65×182, 45×169, 36×136, 47×122, and 64×102 μm, respectively. Anal somite and caudal rami ornamented with minute spinule-like setules on all surfaces. Caudal ramus (Fig. 316D) tapering distally, thin-walled in distal half, 3.0 timeslongerthan wide (96×32 μm): armedwith 6 setae; outer lateral and dorsal setae positioned at 49 and 53% of ramus length, respectively; all caudal setae shorter than width of ramus at base.</p><table><tbody><tr><td></td><th>Coxa</th><th>Basis</th><th>Exopod</th><th>Endopod</th></tr><tr><th>Leg 1</th><td>0-0</td><td>1-0</td><td>I-1; I-1; I+1, 1, 4</td><td>0-1; 0-1; 1, 2, 3</td></tr><tr><th>Leg 2</th><td>0-0</td><td>1-0</td><td>1-0; 1-0; 3, 1, 5</td><td>0-0; 0-0; 1, 2, 2</td></tr><tr><th>Leg 3</th><td>0-0</td><td>1-0</td><td>1-0; 1-0; 3, 1, 5</td><td>0-0; 0-0; 0, 3, 1</td></tr><tr><th>Leg 4</th><td>0-0</td><td>1-0</td><td>1-0; 1-0; 3, 1, 4</td><td>0-0; 0-0; 0</td></tr></tbody></table><p>Rostrumlongerthanwide (120×75 μm), tapering to pointed apex in ventral view (Fig. 316F), hook-like inlateral view (Fig. 316E). Antennule (Fig. 316G) 157 μm long, 8-segmented; articulation incomplete between 2 distal segments; armatureformula 2, 14, 4, 3+aesthetasc, 2, 2+aesthetasc, 2, and 7+2 aesthetascs; all setae naked; aesthetascs short. Antenna (Fig. 316H) 4-segmented; coxa and basis unarmed; first endopodal segment with 1 small seta subdistally; compound distal endopodal segment 2.9 timeslongerthan wide (47×16 μm): armedwith 5 setae (arranged as 1, 2, and 2) plus slender terminal claw, about 0.6 times as long as segment.</p><p>Labrum lost during dissection. Mandible (Fig. 316I) with broadened coxal gnathobase bearing 5 teeth and 1 seta; basiswith 1 setaonmedial margin; exopodwith 5 setae (4 medial setae subequal in length and outermost seta about half as long as other 4); first endopodal segment with 1 broad seta; second endopodal segment with 4 setae (middle 2 longerthan medial and outer setae). Maxillule (Fig. 316J) with 9 setae on arthrite, 1 on each epipodite and basis, 4 on exopod, and 3 on endopod; 3 setaeon endopod becoming longer from medial to outer; coxal endite absent. Maxilla (Fig. 317A) 4-segmented; syncoxa with 4, 3, and 2 setae on first to third endites, respectively; basis with slender, smooth claw plus 1 seta; endopod with 1 and 3 setae on first and second segments, respectively. Maxilliped (Fig. 316K) unsegmented, taperingdistally, armed with 6 setae and ornamented with spinules along outer margin.</p><p>Legs 1–4 (Figs. 317 B-E) with 3-segmented rami; inner seta absent on coxa. Leg 1 lacking inner distal spine on basis. All setae on legs 2–4 naked and bluntly tipped. Endopod slightly shorter than exopod in legs 2 and 3, endopod of leg 4 less than half length of exopod. Third endopodal segment of leg 4 unarmed, bearing only 2 small setules (or setal vestiges) distally. Armatureformula for legs 1–4 as follows:</p><p>Leg 5 (Fig. 317F) represented by 1 ventrodistal seta on surface of somite and tapering, sclerotized exopodal process lacking seta but bearing tubercle subdistally on outer margin, and ornamented with scattered setules.</p><p><b>Male</b>. Unknown.</p><p><b>Remarks</b>. This new species is characterised by the lack of an innerdistal element on the basis of leg 1 and by the absence of a seta on the inner (exopodal) process of leg 5. The combined setation patterns of the third endopodal segments of legs 2 to 4 (5, 4, and 0, respectively) is also an important diagnostic feature of the new species.</p>