Climaconeis tarangensis Lobban 2021, sp. nov.
Creators: name: Lobban, Christopher S.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Chromista
Ochrophyta
Bacillariophyceae
Naviculales
Berkeleyaceae
Climaconeis
Climaconeis tarangensis

description: <i>Climaconeis tarangensis</i> Lobban, <i>sp. nov.</i> Figs 45–49. <b>Diagnosis:—</b> Curved species without craticular bars or stauros, differing from <i>Climaconeis riddleae</i> A.K.S.K. Prasad 2003: 14 in its lower stria density (20 vs 24–27 in 10 µm) and regular apically rectangular areolae. <b>Description:—</b> Living cells not observed. Valves arcuate, 121–124 µm long, 4.5 µm wide at center, gradually tapering to 3.0 µm just before the weakly capitate apices, 3.5 µm wide (Fig. 45). Striae 20–21 in 10 µm, parallel except convergent near apices and radiating around the apex; areolae apically rectangular (Figs 46–49). Raphe biarcuate (Fig. 45), the raphe slit partially covered by an irregular flap along the ventral side (Figs 46, 47). External central raphe endings turned slightly ventral, terminal endings nearly straight. Internal raphe with a rib along one side, helictoglossa at the apex (Figs. 48, 49). Copulae with two rows of apically-oriented pores similar to those on the valve (Figs 46, 47). <b>Holotype hic designatus:—</b> Specimen at 9.0 mm E, 6.4 mm S of the mark on slide 512, deposited at ANSP, accession # ANSP-GC20095. Fig. 45. Registration: http://phycobank.org/102760. <b>Type locality:—</b> F.S.M. Yap State: Tarang (“ O’Keefe’s Island ”), 9.525 N, 138.132 E; subtidal sediments from 15 m depth, sample Y26 C. <i>C.S. Lobban</i> and M. Schefter, 25 September 1988 <i>.</i> <b>Etymology:—</b> Named for the type locality. <b>Comments:—</b> This species is very similar to <i>C. riddleae</i>, which has been recorded from Guam (Lobban <i>et al.</i> 2011) and Chuuk (Park <i>et al.</i> in prep.), but Prasad (2003) described the areolae of that species thus: “squarish or subrectangular poroids… [sometimes] slightly apically elongated, especially at the apices.” In <i>C. tarangensis</i> the areolae are distinctly apically elongate even in the central part of the cell. Prasad’s images show a row of somewhat larger, square areolae along the ventral side of the raphe sternum (the same side that bears the silica flaps). While the differences in stria density and areola shape are small, it has become clear in this genus that such details must be taken into account in discriminating species [e.g., in distinguishing <i>C. mabikii</i> J.Park, Khim &amp; J.H.Lee 2016: 592 from <i>C. undulata</i> (Meister 1932: 41) Lobban, Ashworth &amp; E.C.Theriot 2010: 295 – Park <i>et al.</i> 2016]. For <i>C. tarangensis</i>, with <i>C. riddleae</i> known from the region, it is especially clear that the differences cannot be dismissed as geographic variation between Atlantic and Pacific Ocean basins.
description: Published as part of <i>Lobban, Christopher S., 2021, New species of benthic marine diatoms (Bacillariophyta) from the Western Pacific islands of Guam and Yap, pp. 235-265 in Phytotaxa 508 (3)</i> on page 246, DOI: 10.11646/phytotaxa.508.3.1, http://zenodo.org/record/5425968
description: {"references": ["Prasad, A. K. S. K. (2003) Fine structure and taxonomy of two species of the marine diatom genus Climaconeis (Berkeleyaceae, Bacillariophyta): C. silvae sp. nov. and C. riddleae sp. nov. from the Caribbean Sea and Florida Bay, U. S. A. Hidrobiologica 13: 9 - 22. [http: // www. scielo. org. mx / scielo. php? script = sci _ arttext &amp; pid = S 0188 - 88972003000100002]", "Lobban, C. S., Schefter, M. &amp; Ruck, E. C. (2011) Licmophora flucticulata sp. nov. (Licmophoraceae, Bacillariophyceae), an unusual flabellate species from Guam and Palau. Phycologia 50: 11 - 22. https: // doi. org / 10.2216 / 09 - 85.1", "Meister, F. (1932) Kieselalgen aus Asien. Berlin: Gebruder Bornetraeger.", "Park, J., Lee, J. H. &amp; Khim, J. S. (2016) The identity of ' Berkeleya scopulorum ' from northeast Asia: report on Climaconeis mabikii sp. nov. from temperate marine waters with notes on biogeography of the genus. Ocean Science Journal 51: 591 - 598. https: // doi. org / 10.1007 / s 12601 - 016 - 0059 - z"]}