Natatolana paranarica Keable 2006, n.sp.
Creators: name: Keable, Stephen J.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Cirolanidae
Natatolana
Natatolana paranarica

description: <i>Natatolana paranarica</i> n.sp. Figs. 36–37 <b>Type material</b>. HOLOTYPE: 3, 31 mm, NMNZ. PARATYPES: 333, 5♀♀, manca, NMNZ Cr 4992; 3, ♀, QM W18897. Type locality: Palliser Bay, off Carls Beach, North Island, New Zealand, [c. 41°S 175°E], 5.5m, [14 Jan. 1986]. <b>Diagnosis</b>. <i>Eyes</i>: vestigial. <i>Interocular furrow</i>: well developed, forming a ridge that extends across the cephalon; smoothly convex. <i>Frontal lamina</i>: lateral margins straight, narrowing anteriorly. <i>Antenna</i>: c. 0.48× as long as body, reaching to posterior of pereonite 4. <i>Coxal plates</i>: furrows variously developed, incomplete on coxae 2–3, absent on coxae 4–7. <i>Pleonite 4</i>: posterodorsal margin strongly concave proximal to meeting posteroventral margin at apex; apex forming a narrow acute point. <i>Pleotelson</i>: broad, length 0.9× basal width; anterodorsal depression absent; anterolateral margins convex; posterolateral margins convex; apex not produced, lateral margins converging smoothly to a point; with 10–14 RS. <i>Pereopod 2</i>: propodus with 0–2 RS on palm. <i>Pereopod 3</i>: propodus without RS on palm. <i>Pereopod 7</i>: basis of medium breadth, width 0.5× length; distance between anterior margin and medial carina less than between posterior margin and medial carina; posterior margin with setae on proximal third. <i>Penes</i>: absent. <i>Pleopod 2 appendix masculina</i>: just shorter than endopod, 0.92× length of endopod; margins very slightly curved laterally; slender; apex not at angle to adjacent margins, bluntly rounded. <i>Uropods</i>: exopod longer than endopod, 1.08× the length of the endopod. <b>Additional descriptive characters</b>. Based on holotype. <i>Body</i>: length c. 2.8× width. Colour cream/yellow in alcohol. Chromatophores absent. <i>Eyes</i>: with 14 ommatidia in horizontal diameter; with 11 ommatidia in vertical diameter; round; lacking pigment in alcohol. <i>Frontal lamina</i>: length c. 3.9× basal width; apex expanded, anterior margin angled. <i>Antennule</i>: peduncular article 1 longer than article 2; article 2 with 1 large pappose seta and 3 penicillate setae; article 3 short, subequal to article 1. Flagellum 16-articulate. <i>Antenna</i>: peduncular article 4 with 6 SS medially on posterolateral margin, 2 SS near posterodistal angle and 4 SS at anterodistal angle; article 5 with 2 pappose setae at posterodistal angle, 4 SS and 1 penicillate seta at anterodistal angle. Flagellum 28-articulate. <i>Mandible</i>: setal row with 21 RS. <i>Maxillule</i>: medial lobe with 3 large and 1 smaller robust pappose setae; lateral lobe with 13 RS on distal surface. <i>Maxilla</i>: lateral lobe with 4 SS; medial lobe with 15 SS and 8 PS; middle lobe with 18 SS. <i>Maxilliped</i>: endite with 2 coupling hooks, 1 PS and 2 SS. <i>Pereon</i>: ornamentation consists of 1 strongly developed furrow on lateral margin of pereonite 1, 1 short curved furrow on lateral margin of pereonites 2–3, 1 short medial furrow on lateral margins of pereonites 4–7; pereonite 1 longest, 2–6 subequal, 7 shortest. <i>Coxae</i>: pereonite 1 and coxa 2 with rounded posteroventral corners, coxa 3 with square posteroventral corner, coxae 4–7 with increasingly produced, broad, acute posteroventral corners. <i>Pleonite 2</i>: dorsal posterolateral margin subequal with ventral posterolateral margin. <i>Pereopod 7</i>: basis anterior margin slightly convex; medial carina with PS along entire length; posterior margin convex, PS present. Ischium anterior margin with SS; posterior margin without RS, PS present. Merus anterior margin with SS; posterior margin without RS (9 submarginally), SS present. Carpus posterior margin without RS, SS present. Propodus longer than carpus; posterior margin with 5 RS, SS present. <i>Pleopod 2 appendix masculina</i>: arising sub-basally. <i>Pleopods 1–5</i>: exopod suture strongly developed on pleopods 3–5; endopod PS on most of margins of pleopods 1–4, only a few setae on pleopod 5. <i>Uropods</i>: endopod lanceolate; medial margin convex, with 5 RS, PS along entire length; apex with 2 RS; lateral margin slightly convex, with 4 RS, PS on distal three-quarters. Exopod medial margin convex, with 4 RS, PS along entire length; apex acute, with 2 RS; lateral margin convex, with 8 RS, PS along entire length. <b>Variation</b>. Several of the paratypes have one or two robust setae on the palm of pereopod 2 but this is not a consistent feature. The holotype has 11 robust setae on the pleotelson. Robust setal counts from margins of paratypes (n=10): pleotelson: damaged (20%); 5:6 (20%); 6:6 (30%); 6:7 (30%). Endopod, medial: 6 (70%), 5 (30%); lateral: 2 (10%), 3 (30%), 4 (60%). Exopod medial: 3 (20%), 4 (60%), 5 (20%); lateral: 7 (10%), 8 (30%), 9 (40%), 10 (20%). <b>Size</b>. Adults to 31 mm. <b>Etymology</b>. Refers to the similarity this species has to <i>Natatolana narica</i>. <b>Remarks</b>. <i>Natatolana paranarica</i> is almost identical to <i>N. narica</i> but differs in that the posterolateral margins of the pleotelson meet at an acute angle, rather than being broadly rounded; the uropod endopod medial margin is smoothly convex, not sinuate; the ventral margin of the posterior coxae is straight not sinuate; there are slender setae at the uropod endopod and exopod apices that are shorter than the length of these rami, rather than being as long as them. <i>Natatolana paranarica</i> and <i>N. narica</i> are the only species of <i>Natatolana</i> in which the uropod exopod is distinctly longer than the endopod. The uropod exopod is as long as the endopod in <i>N. endota</i> but that species differs in many characters, including having only four robust setae on the pleotelson and antennae that are longer than the body. <b>Distribution</b>. New Zealand: known only from the type locality. At a depth of 5.5 m.
description: Published as part of <i>Keable, Stephen J., 2006, Taxonomic Revision of Natatolana (Crustacea: Isopoda: Cirolanidae), pp. 133-244 in Records of the Australian Museum 58 (2)</i> on pages 210-211, DOI: 10.3853/j.0067-1975.58.2006.1469, http://zenodo.org/record/4685692