Sedorolis simplex Bruce 2009, sp. n.
Creators: name: Bruce, Niel
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Serolidae
Sedorolis
Sedorolis simplex

description: <i>Sedorolis simplex</i> sp. n. urn:lsid:zoobank.org:act: 8F2B963A- 1115-46 F5-A4DD-9F828AA5B921 Figs 5–8 <b>Material</b> All material from New Caledonia. <i>Holotype:</i> 3 (4.7 mm), 22°47.30´S, 167°14.30´E, 30 Aug 1985, 440 m, BIOCAL stn DW44 (MNHN Is.6000). <i>Paratypes:</i> 3 (4.8 mm; NLB dissect left side, mouth, P1, P2, P6, P7, Plp 1, 2, 4, 5), &amp;female; (ovig. ̴ 5.3 mm), same data as holotype (MNHN Is.6001, incl. 5 microslides). 2 3 (5.3, 5.5 mm), 22°15´S, 167°150´E, 05 Sep 1985, 440 m, BIOCAL, stn. DW 77, N.O. ‘Jean Charcot’ (MNHN Is.6002). <i>Additional material:</i> All in poor condition, some specimens heavily dissected previously and extensively mutilated: 8 (all small &lt;5 mm; one dissected), 440 m, BIOCAL, stn. DW 44 (MNHN Is.6003). 3 (pre-dissected), &amp;female; (pre-dissected), 570 m, ex BIO- CAL stn DW 46 (MNHN Is.6004). 5 (poor condition), 570, DW 46 m (MNHN Is.6005). 10 (condition very poor, possibly partly decomposed), 22°15´S, 167°150´E, 05 Sep 1985, 440 m, BIOCAL, stn. DW 77, N.O. ‘Jean Charcot’ (MNHN Is.6006). Appendages from the previously dissected 3 DW46 (MNHN Is.6004) were not complete, missing one posterior leg, maxilliped and the maxilla; pleopod 5 lacked one ramus, and the maxillule lacked the endite. <b>Description.</b> <i>Body</i> 1.3 as long as wide, widest at coxae 3 and coxae 4, <i>dorsal surfaces smooth. Head</i> anterolateral lobes <i>weakly convex,</i> anterior submarginal ‘ridge’ on lateral lobes only; dorsally without tubercles, posterior margin without median tubercle. <i>Pereonites</i> all with visible entire sutures, articulating, <i>pereonite 1</i> anterolateral margin continuously convex; dorsally without tubercles. <i>Coxae</i> of pereonites 2–4 articulated, with dorsal sutures (sutures weak), distal margins truncate; coxae 4 not posteriorly extended; 5 extending posteriorly along 0.3 of pleotelson length; coxae 6 extending to mid-length of uropod peduncle, and along 0.5 of pleotelson length. <i>Ventral coxal plates</i> 2–4 meeting midline, mesially flat, plates 2–4 mesially simple, smooth; plates 6 and 7 incompletely separated (partly fused). Sternites 5–7 visible, sternite 5 not mesially demarcated by suture. Pleonite 1 sternal plates trilobed, lobes gently rounded, sternal plate 1 without median ridge. <i>Pleotelson</i> 0.8 times as long as anterior width, dorsal surface with median longitudinal carina (weak), without paired sublateral carinae; lateral margins weakly sinuate, posterior margin broadly truncate, without distinct median excision. <i>Antennule</i> peduncle article 2 1.6 times as long as wide; articles 3 and 4 2 times as long as article 2; article 3 4.2 times as long as wide; flagellum 1.4 as long as peduncle articles 3 and 4, with 22 articles, extending to anterior of pereonite 3. <i>Antenna</i> peduncle article 4 3.2 times as long as wide, 3.5 times as long as article 3; article 5 1.2 times as long as article 4, 4.3 times as long as wide; antennal flagellum 0.7 as long as peduncle article 5, with 9 articles, extending to posterior of pereonite 4. <i>Epistome</i> with obtuse median point. <i>Mandible incisor</i> with 2 posterior cusps, left mandible lacinia mobilis 0.5 as wide as incisor, right mandible lacinia mobilis distally multicuspid, mandibular spine distally serrate; palp article 2 with 10 distolateral setae, article 3 with 19 biserrate setae. <i>Maxilla</i> mesial lobe with 28 long, finely serrate setae; middle lobe and lateral lobe each with 2 distal simple setae. <i>Maxilliped palp</i> article 2 proximomesial margin with 3 setae, distomesial margin with 7 setae, lateral margin distally with 2 setae; article 3 lateral margin with 1 setae, distal margin with 9 setae; endite distal margin RS simple. <i>Pereopod 1</i> carpus RS with prominent pilose flagellum; propodus 1.9 times as long as wide, inferior margin with ̴38 RS; narrow RS trifid, distally pilose. <i>Pereopod 2 basis</i> 4.5 times as long as greatest width; 0.7 times as long as basis, ischium 3.2 times as long as wide; <i>merus</i> 0.5 as long as ischium, 1.8 times as long as greatest width, inferior margin with 1 cluster of setae (2), superior distal angle with 1 seta (RS); <i>carpus</i> 0.6 as long as ischium, 1.4 times as long as wide, inferior margin with 2 clusters of setae (as 1 and 1); <i>propodus</i> 0.6 as long as ischium, 2.1 times as long as wide, inferior margin with indistinct heel, palm straight, inferolateral margin with 4 RS (and 3 simple setae), inferomesial margin with 3 RS, inferior margin RS distally bifid, smooth, distal margin with 6 setae, <i>dactylus</i> 0.5 as long as propodus, unguis offset to axis of dactylus. <i>Pereopod 6 basis</i> 4.0 times as long as greatest width; <i>ischium</i> 0.8 as long as basis, 3.5 times as long as wide, inferior margin with 1 cluster of setae (1); <i>merus</i> 0.7 as long as ischium, 2.8 times as long as wide, inferior margin with 3 clusters of setae (as 1, 1, and 2), superior distal angle with 3 setae; <i>carpus</i> 1.1 as long as ischium, 4.6 times as long as wide, inferior margin with 5 clusters of setae (as 2, 2, 2, 3 and 3), superior distal angle with 7 setae; <i>propodus</i> 0.8 as long as ischium, 5.8 times as long as wide, inferior margin with 3 clusters of setae (as 2, 3 and 3), distal margin with 8 setae, inferior distal angle with 2 RS; <i>dactylus</i> 6.0 as long as proximal width. <i>Pereopod 7</i> similar to, but 0.7 as long as pereopod 6. Setae on inferior margins of pereopods 4 to 7 simple and distally flexible. Inferior margins of pereopods 2–7 setulose fringe absent. <i>Pleopod 1</i> Peduncle 3.5 times as long as wide; exopod 1.7 as long as wide, with 16 PMS; endopod 2.3 times as long as wide, 0.6 as long as exopod, with 6 PMS. <i>Pleopod 2</i> peduncle 4.0 as long as wide; exopod 1.7 as long as wide, with 19 PMS; endopod 6.1 as long as greatest width, lamellar part 4.7 as long as wide, with 5 PMS; <i>appendix masculina</i> 2.9 times as long as endopod. <i>Pleopod 3</i> exopod with 22 PMS, endopod with 12 PMS. <i>Pleopod 4</i> exopod with complete transverse suture, endopod with incomplete or weak transverse suture. <i>Pleopod 5</i> exopod with complete transverse suture, endopod with incomplete transverse suture. <i>Uropods</i> (rami + peduncle) 0.8 as long as pleotelson, peduncle 0.6 as long as endopod. <i>Endopod</i> 2.3 as long as wide; distally broadly rounded. <i>Exopod</i> 0.6 as long as endopod, 2.3 times as long as wide, distally broadly rounded. <b>Size.</b> 4.8 to 5.5 mm. <b>Colour:</b> No chromatophores; pale cream–yellow. <b>Remarks</b>. Th e species is identified by the characters of the genus. See <i>Sedorolis</i> sp. for comments on potential species character differences. <b>Distribution.</b> New Caledonia, in the vicinity of the type locality; 440– 570 m. <b>Etymology.</b> From the Latin <i>simplex</i>, simple–in the sense of smooth, not ornamented.
description: Published as part of <i>Bruce, Niel, 2009, New genera and species of the marine isopod family Serolidae (Crustacea, Sphaeromatidea) from the southwestern Pacific, pp. 17-76 in ZooKeys 18 (18)</i> on pages 31-37, DOI: 10.3897/zookeys.18.96, http://zenodo.org/record/576495