Divergita biformis , Lobban 2021, sp. nov.
Creators: name: Lobban, Christopher S.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Chromista
Ochrophyta
Bacillariophyceae
Licmophorales
Ulnariaceae
Divergita
Divergita biformis

description: <i>Divergita biformis,</i> Lobban, <i>sp. nov.</i> Figs. 26–28. <b>Diagnosis:—</b> Valves straight, lanceolate with weakly capitate apices. Striae biseriate and decussate only on the mantle, striae on valve face mostly uniseriate with quadrangular areolae; sternum linear, very narrow. <b>Description:—</b> Live cells not observed. Valves seen in LM (Figs 24, 25) were from different samples from the SEM holotypes and could not be identified to <i>D. divergita</i> vs. <i>D. decipiens</i> (see below). Valves straight, 76 µm long, 4 µm wide, lanceolate with weakly capitate apices (Fig. 26). Striae 26–28 in 10 µm, biseriate on the margin with triangular areolae alternating and thus forming a decussate pattern, becoming largely uniseriate on the valve face with up to four quadrate areolae (Figs 27, 28). Sternum linear and very narrow. A hyaline area at each apex with a rimoportula in each. Apical pore field apparently with three rows of pores and not sunken. <b>Holotype hic designatus:—</b> Figs 26–28 from stub 1116 (GUAM diatom herbarium, catalog # 701116), according to Article 40.5 of the International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) (Turland <i>et al</i>. 2018). Registration: http://phycobank.org/102756. <b>Type locality:</b> <i>—</i> F.S. M. Yap: reef flat near channel to Colonia, 13.464 N, 144.656 E, dense farmer fish turf scraped from <i>Acropora</i> coral, ca. 1 m deep, sample Y45-5. <i>C.S. Lobban and M. Schefter, 31 May 2014</i> <i>.</i> <b>Etymology:—</b> named for the two patterns of areolae in the striae. <b>Additional Records:—</b> F.S.M. Yap: Nimpal MPA, Y36-2!, Y36-4!; GUAM: GU52Q-1a!, GU44AP-8! <b>Comments:—</b> Similar specimens occurred in several samples from each of Guam and Yap but were always rare. There was considerable variation among these specimens and some clear differences, so I have chosen to define two species on the basis of ultrastructural details. For this species, defined on the specimen from Y45-5, I found no internal aspect but for <i>D. decipiens</i> the internal view shows the characteristics of <i>Divergita</i>, which do not vary between species.
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 242, DOI: 10.11646/phytotaxa.508.3.1, http://zenodo.org/record/5425968
description: {"references": ["Turland, N. J., Wiersema, J. H., Barrie, F. R., Greuter, W., Hawksworth, D. L., Herendeen, P. S., Knapp, S., Kusber, W. - H., Li, D. - Z., Marhold, K., May, T. W., McNeill, J., Monro, A. M., Prado, J., Price, M. J. &amp; Smith, G. F. (Eds.) (2018) International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Glashutten: Koeltz Botanical Books. https: // doi. org / 10.12705 / Code. 2018"]}