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

description: <i>Natatolana debrae</i> n.sp. Figs. 14–16 <i>Cirolana corpulenta</i>.– Hale, 1925: 134 fig. 3 (part) [misidentification, not <i>Natatolana corpulenta</i> (Hale, 1925)]. <b>Type material</b>. HOLOTYPE: 3, 9 mm, AM P31604. PARATYPES: ♀, 16 mm, ♀, 6.5 mm, manca, 6 mm, AM P47245. Type locality: Henley Beach, Adelaide, South Australia, Australia, 38°56'S 138°31'E, low tide sand bar 20 m off shore, fine sand and shell, [J.K. Lowry, 29 Dec. 1976]. <b>Additional material</b>. South Australia, paratype female of <i>Natatolana corpulenta</i>, SAMA C 277, Brighton [presumably Gulf St Vincent, 35°01'S 138°31'E], from body cavity of <i>Heterodontus phillipi</i>, H. Collyer. <b>Diagnosis</b>. <i>Interocular furrow</i>: absent. <i>Frontal lamina</i>: lateral margins medially constricted. <i>Antenna</i>: c. 0.46× as long as body, reaching to posterior of pereonite 4. <i>Coxal plates</i>: furrows moderately developed, on all coxae. Pereonite 1, coxa 2 posterior margins sinuate, posteroventral corners developed into weak coxal points. <i>Pleonite 4</i>: posterodorsal margin strongly concave proximal to meeting posteroventral margin at apex; apex forming a broad acute point. <i>Pleotelson</i>: broad, length 0.9× basal width; anterodorsal depression present; anterolateral margins convex; posterolateral margins concave; apex produced into a large point; with 10 RS. <i>Pereopods 1–6</i>: males with conspicuous elongated RS subequal to propodus on the merus of pereopods 1–3 and extending from the carpus to dactylus of pereopods 4–6. <i>Pereopods 2–3</i>: propodus without RS on palm. <i>Pereopod 7</i>: basis narrow, width 0.42× length; distance between anterior margin and medial carina less than between posterior margin and medial carina; posterior margin with setae along entire length. <i>Penes</i>: present. <i>Pleopod 2 appendix masculina</i>: extending beyond tip of endopod, 1.05× length of endopod; margins sinuate; slender; apex not at angle to adjacent margins, bluntly rounded. <i>Uropods</i>: exopod subequal to endopod, 0.93× the length of the endopod; lateral margin with RS. <b>Additional descriptive characters</b>. Based on holotype. <i>Body</i>: length c. 2.11× width. Colour cream-yellow in alcohol. Chromatophores absent. <i>Eyes</i>: with 5 ommatidia in horizontal diameter; with 8 ommatidia in vertical diameter; ovate; colour brown in alcohol. <i>Frontal lamina</i>: length c. 3.8× basal width; apex expanded, anterior margin angled. <i>Antennule</i>: peduncular article 1 longer than article 2; article 2 with 1 large pappose seta; article 3 short, subequal to article 1. Flagellum 10-articulate. <i>Antenna</i>: peduncular article 4 with 5 SS medially on posterolateral margin, 4 SS on distal margin, 3 SS and 1 penicillate seta at anterodistal angle; article 5 with 2 conspicuous pappose setae and 1 SS at posterodistal angle, 3 SS on distal margin and 2 SS at anterodistal angle. Flagellum 20-articulate. <i>Mandible</i>: setal row with 16 RS. <i>Maxillule</i>: medial lobe with 3 large robust pappose setae and 2 SS; lateral lobe with 12 RS on distal surface. <i>Maxilla</i>: lateral lobe with 4 SS; medial lobe with 6 SS and 9 PS; middle lobe with 11 SS. <i>Maxilliped</i>: endite with 2 coupling hooks, and 7 PS. <i>Pereon</i>: ornamentation consists of 1 strongly developed furrow on lateral margin of pereonite 1; pereonite 1 longest, 4–6 subequal and longer than 2–3 and 7 which are subequal. <i>Coxae</i>: coxal points weakly developed on posteroventral corners of pereonite 1 and all coxae. <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, SS present. Ischium anterior margin with SS; posterior margin with 1 RS (and 2 submarginally), PS present. Merus anterior margin with SS; posterior margin with 1 RS (submarginal), SS present. Carpus anterior margin with 1 SS; posterior margin with 3 RS (and 1 submarginally), SS absent. Propodus subequal to carpus; posterior margin with 3 RS, SS absent. <i>Penes</i>: forming well separated flattened lobes. <i>Pleopod 2 appendix masculina</i>: arising 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 triangular; medial margin slightly convex and obtusely angled proximal to peduncle, with 5 RS, PS along entire length; apex with 2 RS; lateral margin slightly convex, with 4 RS and 1 penicillate seta, PS along entire length. Exopod medial margin convex, with 3 RS, PS along entire length; apex acute, with 2 RS; lateral margin convex, with 8 RS, PS along entire length. <b>Variation</b>. The right uropod endopod of the holotype has two robust seta on the apex and four robust setae on the medial margin. <b>Sexual dimorphism</b>. Females lack the conspicuously elongated robust setae present on the merus of pereopods 1–3 and the carpus of pereopods 4–6 of adult males. <b>Size</b>. Adults to c. 16 mm. <b>Etymology</b>. Named after my wife Debra, in recognition of the help she has given me during this and other projects. <b>Remarks</b>. The specimen of <i>Natatolana corpulenta</i> recorded by Hale (1925) from the body cavity of a Port Jackson shark collected by H. Collyer at Brighton is registered in SAMA collections (C277) as a paratype of <i>N. corpulenta</i> but is actually a specimen of <i>N. debrae</i>. <i>Natatolana debrae</i> is most similar to <i>N. corpulenta, N. femina</i> n.sp. and <i>N. sinuosa</i> n.sp. <i>Natatolana debrae</i> differs from <i>N. corpulenta</i> in lacking an acute produced tooth on the anteroventral corner of coxa 2; in having sinuate posterior margins developed into weak coxal points on the posteroventral corners of pereonite 1 and coxae 2–3; and in having longer antennae. <i>Natatolana sinuosa</i> and <i>N. femina</i> can be readily distinguished from <i>N. debrae</i> by the development of coxal points on the posteroventral corners of pereonite 1 and coxa 2–3 (much stronger in <i>N. sinuosa</i> and rounded in <i>N. femina</i>). <b>Distribution and ecology</b>. Australia: known only from Gulf St Vincent, South Australia. Apparently intertidal and subtidal. Scavenger (specimens have been recorded from the body cavity of a Port Jackson shark).
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 170-173, DOI: 10.3853/j.0067-1975.58.2006.1469, http://zenodo.org/record/4685692
description: {"references": ["Hale, H. M., 1925. Review of Australian isopods of the cymothoid group. Part I. Transactions of the Royal Society of South Australia 49: 128 - 185."]}