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

description: <i>Heteroserolis pellucida</i> sp. n. urn:lsid:zoobank.org:act: 9F6254B0-1B95-40DE-BEA4-3C17FF40A57C Figs 1–4 <b>Material</b> All material from New Caledonia. <i>Holotype:</i> <b>&amp;male;</b> (10.6 mm),‘ Sud Landsdowne’, 21°05.254–04.244´S, 160°48.955– 793´E, 21 Oct 2005, EBISCO stn CP2627, 736– 711 m (MNHN Is.6016). <i>Paratypes:</i> <b>&amp;male;</b> (10.5 mm, dissected), 6&amp;female; (4 ovig. 14.8 (drawn), 13.8, 13.5, 12.6, mm, 2 non-ovig. 12.4, 12.0 mm), ‘ Sud Landsdowne’, 21° 05.254 –04.244´S, 160°48.955–793´E, 21 Oct 2005, EBISCO stn CP2627, 736– 711 m (MNHN Is.6017). 2&amp;female; (ovig. 14.6, 11.8 mm, 1 very damaged), ‘ Sud Landsdowne’, 21°05.085–965´S, 160°47.425–510´E, 21 Oct 2005, EBISCO stn CP2628, 672– 678 m (MNHN Is.6018). &amp;female; (ovig. 13.1 mm), ‘ Sud Landsdowne’, 20°51.216–228´S, 161°00.528– 160°59.336´E, 22 Oct 2005, EBISCO stn CP2643, 557– 565 m (MNHN Is.6019). 6&amp;female; (4 ovig. 13.2, 12.9, 12.6, 12.2 mm, 2 non-ovig. 11.2, 10.8 mm), ‘ Sud Landsdowne’, 20° 52.625 –54.197´S, 160°58.687– 568´E, 22 Oct 2005, EBISCO stn CP2644, 600– 625 m (MNHN Is.6020). 2&amp;female; (ovig. 13.5, 13.0 mm), ‘ Sud Landsdowne’, 21°31.566–330´S, 162° 32.069 –33.008´E, 23 Oct 2005, EBISCO stn CP2649, 775– 792 m (MNHN Is.6021). <i>Additional material:</i> 2&amp;female;, Iles Chesterfields, 20°07.72´S, 160°55.76´E, 21 Jul 1988, CORAIL 2, stn DE15, 590– 580 m, coll. ORSTOM, Richer de Forges (MNHN Is.6022; dissected ovig &amp;female; in separate tube). 3 (pre-dissected), Iles Chesterfield, 21°00.69´S, 160°57.18´E, 21 Jul 1988, CORAIL 2, stn DE14, 650– 660 m, ORSTOM, Richer de Forges (MNHN Is.6023). <b>Description.</b> <i>Body</i> 1.2 as long as wide, widest at coxae 3, dorsal surfaces smooth. <i>Head</i> anterolateral lobes mesially concave, anterior submarginal ‘ridge’ entire; dorsally without tubercles, posterior margin with low rounded median tubercle. <i>Eyes</i> medium size (between 5 and 15% head width), reniform, ommatidia distinct. <i>Pereonite 1</i> anterolateral margin continuously convex; dorsal surfaces without tubercles. <i>Coxae</i> distal margins weakly convex; coxae 4 extending to mid-pleonite 2; coxae 5 extending posteriorly along 0.3 of pleotelson length; coxae 6 extending to mid-length of uropods, and along 0.6 of pleotelson length. <i>Ventral coxal plates</i> mesially flat, plates 2–4 mesially simple, smooth; plates 6 and 7 entirely separate. Sternal plate 1 with weak median ridge, with process extending to posterior of sternal plate 2. <i>Pleotelson</i> 1.2 times as long as anterior width, dorsal surface without median longitudinal carina, with paired sublateral carinae; lateral margins sinuate, posterior margin converging to angled caudomedial point, without distinct median excision. <i>Antennule</i> peduncle article 2 3.6 times as long as wide; articles 3 and 4 2.0 times as long as article 2 (1.96); article 3 6.8 times as long as wide; flagellum 2.0 as long as pe- duncle articles 3 and 4, with ̴34 articles, extending to pereonite 3. <i>Antenna</i> peduncle article 4 5.6 times as long as wide, 3.3 times as long as article 3; article 5 1.1 times as long as article 4, 6.3 times as long as wide; antennal flagellum 0.9 as long as peduncle article 5, with ̴15 articles, extending to posterior of pereonite 3. <i>Epistome</i> with acute median point. <i>Mandible incisor</i> with two distinct posterior cusps, left mandible lacinia mobilis 0.7 as wide as incisor, right mandible lacinia mobilis distally multicuspid (with prominent process), mandibular spine simple; palp article 2 with 21 distolateral setae, article 3 with 23 biserrate setae. <i>Maxilla</i> mesial lobe with 7 long, finely serrate setae; middle lobe with 2 long simple setae; lateral lobe with 2 distal simple setae. <i>Maxilliped palp</i> article 2 proximomesial margin with 4 setae, distomesial margin with 10 setae, lateral margin distally with 3 setae; article 3 lateral margin with 1 seta, distal margin with 8 setae; endite distal margin RS serrate. <i>Pereopod 1</i> propodus 2.1 times as long as wide, inferior margin with ̴38 RS; wide RS with deeply serrate margins and ridged surface, narrow RS simple, deeply bifid; dactylus with acute unguis. <i>Pereopod 2 basis</i> 5.1 times as long as greatest width; 0.7 times as long as basis, ischium 3.8 times as long as wide; <i>merus</i> 0.4 as long as ischium, 1.5 times as long as greatest width, inferior margin with 1 cluster of setae (of 1), superior distal angle with 1 seta; <i>carpus</i> 0.5 as long as ischium, 2.7 <b>G</b> times as long as wide, inferior margin with 2 clusters of setae (as 2 and 2); <i>propodus</i> 0.5 as long as ischium, 2.0 times as long as wide, inferior margin with indistinct heel, palm straight, inferolateral margin with 6 RS, inferomesial margin with 5 RS, inferior margin RS both blunt and acute, distally pilose, distal margin with 5 setae; <i>dactylus</i> 0.8 as long as propodus, unguis simple, blunt. <i>Pereopod 6 basis</i> 4.5 times as long as greatest width; <i>ischium</i> 0.8 as long as basis, 4.9 times as long as wide, inferi- or margin with 0 clusters of setae, superior distal angle with 0 RS; <i>merus</i> 0.6 as long as ischium, 3.1 times as long as wide, inferior margin with 2 clusters of setae (as 1 and 2), superior distal angle with 1 setae; <i>carpus</i> as long as ischium, 5.1 times as long as wide, inferior margin with 5 clusters of setae (as 2, 2, 2, 2 and 3; setae stiff), superior distal angle with 2 setae; <i>propodus</i> 0.5 as long as ischium, 5.7 times as long as wide, inferior margin with 4 clusters of setae (as 1, 1, 1, 1; RS), distal margin with 6 setae, inferior distal angle with 1 RS; <i>dactylus</i> 5.4 as long as proximal width. <i>Pereopod 7</i> similar to, but 0.6 as long as pereopod 6. Setae on inferior margins of pereopods 4–7 distally rough or finely plumose. Inferior margins of pereopods 2–7 setulose fringe absent. <i>Penial openings</i> narrowly separated, <i>penes</i> opening flush with surface of sternite 7. <i>Pleopod 1</i> peduncle 2.1 times as long as wide, mesial margin with 2 plumose slen- der setae; exopod 1.6 as long as wide, with 22 PMS; endopod 2.1 times as long as wide, 0.5 as long as exopod, with 12 PMS. <i>Pleopod 2</i> peduncle 2.5 as long as wide, mesial margin with 2 plumose slender setae; exopod 1.7 as long as wide, with 26 PMS; endopod 4.0 as long as greatest width, lamellar part 3.0 as long as wide, with 9 PMS; <i>appendix masculina</i> 3.5 times as long as endopod. <i>Pleopod 3</i> exopod with 28 PMS, endopod with 16 PMS. <i>Pleopod 4</i> exopod with complete transverse suture (lateral margin with conspicuously thickened rim), endopod without transverse suture. <i>Pleopod 5</i> exopod with complete transverse suture (lateral margin distal part with thickened rim), endopod with incomplete transverse suture. <i>Uropods</i> (rami + peduncle) 0.6 as long as pleotelson, peduncle 0.2 as long as endopod. <i>Endopod</i> 3.6 as long as wide; distally with apical point. <i>Exopod</i> 0.6 as long as endopod, 3.5 times as long as wide, distally broadly rounded. <i>Female.</i> As for male, but pleonites 1–3 each have a weak sub-carinate nodules on pereonite 1, and the median nodule on the posterior margin if the head is more developed. <b>Size.</b> Two males measured 10.5 and 10. 6 mm; ovigerous females 11.8–14.8 mm (mean = 13.2 mm); non-ovigerous females 10.8–12.4 mm (mean = 11.6 mm). <b>Remarks.</b> <i>Heteroserolis pellucida</i> sp. n. is characterised by the semi-transparent cuticle, lack of obvious dorsal nodules, the narrow and acute pleonite margins, a relatively short rostral point and the posterior margin of the pleotelson forming an angled medial point. In addition it is the only species of the genus with a wide lacinia mobilis on the left mandible. Most species of <i>Heteroserolis</i> show some degree of dorsal ornamentation, the exceptions being the East Pacific species <i>H. tropica</i> and two eastern Australian species, <i>H. longicaudata</i> and <i>Heteroserolis</i> sp. (Harrison and Poore 1984). <i>H. longicaudata</i> (southeastern Australia) has a nodular pleotelson and the pleotelson apex is excised, while <i>Heteroserolis</i> sp., known from two immature specimens from shallow water off Townsville, northern Queensland has a truncate pleotelson apex and obscure median nodules on pereonites 2 and 3. <i>Heteroserolis pellucida</i> has a very distinctly thickened rim to the lateral margin of pleopod 4 exopod, and a slightly less prominent rim on the distal part of the exopod of pleopod 5. Pleopods 4 and 5, where illustrated for other species, have not appeared to show this character state, at present I regard this as a unique species character. <b>Distribution.</b> New Caledonia; at depths of 557–792 metres. <b>Etymology.</b> From the Latin adjective <i>pellucidus</i> ‘admitting light’ or semi-transparent.
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 24-29, DOI: 10.3897/zookeys.18.96, http://zenodo.org/record/576495
description: {"references": ["Harrison K, Poore GCB (1984) Serolis (Crustacea, Isopoda, Serolidae) from Australia, with a new species from Victoria. Memoirs of the Museum of Victoria 45: 13 - 31."]}