Open Access Open Access  Restricted Access Subscription or Fee Access


DOI: http://dx.doi.org/10.11646/phytotaxa.161.2.5

Placoneis cocquytiae, a new raphid diatom (Bacillariophyceae) from the Senegal River (Senegal, West Africa)

Cheikh Abdoul Kader Fofana, El Hadji Sow, Jonathan Taylor, Luc Ector, Bart Van De Vijver

Abstract


During a survey of the freshwater diatom flora of the Senegal River, an unknown Placoneis species was observed that was initially identified as Placoneis gastrum. Detailed morphological analysis using both light and scanning electron microscopy observations revealed sufficient morphological differences to separate this species as Placoneis cocquytiae sp. nov. The new species is characterized by a rather broadly lanceolate to elliptic-lanceolate valve outline with rostrate, protracted, broadly rounded apices. The central area has an irregular shape due to the shortening of several striae. An isolated pore is lacking. The new species is compared with similar Placoneis and Navicula s.l. taxa and a short biogeographical analysis based on confirmed African records is presented. So far, P. cocquytiae is also present in Zambia and Lake Tanganyika. 


Keywords


During a survey of the freshwater diatom flora of the Senegal River, an unknown Placoneis species was observed that was initially identified as Placoneis gastrum. Detailed morphological analysis using both light and scanning electron microscopy observatio

Full Text:

PDF/A (5.89 MB)

References


Alfinito, S., Fumanti, B. & Ricci, S. (1989) Freshwater algae from Kania (Sierra Leone, West Tropical Africa). Rivista di Idrobiologia 28 (1-2): 167–178.

Alfinito, S., Fumanti, B. & Ricci, S. (1994) Diatoms from York, Sierra Leone (West Africa). Ricerche Biologiche in Sierra Leone (Parte IV). Quaderni Accademia Nazionale dei Lincei 267: 65–79.

Alfinito, S. & Lange-Bertalot, H. (2013) Contribution to the knowledge of the freshwater algae of Sierra Leone (Tropical West Africa): diatoms from Loma Mountains and Bumbuna Falls, the Northern Province. Biodiversity Journal 4 (1): 135–178.

Brightwell, T. (1856) Further observations on the genus Triceratium, with descriptions and figures of news species. Quarterly Journal of Microscopical Science 4: 272–276, pl. 17.

Carter, J.R. & Denny, P. (1982) Freshwater algae of Sierra Leone. III. Bacillariophyceae: Part (i) Diatoms from the River Jong (Taia) at Njala. Beiheft zur Nova Hedwigia 73: 281–331.

Carter, J.R. & Denny, P. (1987) Freshwater algae of Sierra Leone. IV. Bacillariophyceae: Part (ii) diatoms from the coastal region of the southern province. Nova Hedwigia 44 (1–2): 229–275.

Carter, J.R. & Denny, P. (1992) Freshwater algae of Sierra Leone. IV. Bacillariophyceae: Part (iii) Diatoms from the Lake Sonfon region and from Lake Popei. Nova Hedwigia 54 (1–2): 159–221.

Cocquyt, C. (1998) Diatoms from the Northern Basin of Lake Tanganyika. Bibliotheca Diatomologica 39: 1–275.

Compère, P. (1991) Contribution à l'étude des algues du Sénégal 1. Algues du lac de Guiers et du Bas-Sénégal. Bulletin du Jardin Botanique National de Belgique 61 (3/4): 171–267.

http://dx.doi.org/10.2307/3668149

Compère, P. & Riaux-Gobin, C. (2009) Diatomées de quelques biotopes marins, saumâtres et dulçaquicoles de Guinée (Afrique occidentale). Systematics and Geography of Plants 79 (1) : 33–66.

Couté, A. & Iltis, A. (1985) Etude au microscope électronique à balayage de quelques algues (Dinophycées et Diatomophycées) de la lagune Ebrié (Côte d’Ivoire). Nova Hedwigia 41 (1–4): 69–88.

Cox, E.J. (1996) Identification of Freshwater Diatoms from Live Materials. 158 pp. Chapman & Hall, London.

Cox, E.J. (2003) Placoneis Mereschkowsky (Bacillariophyta) revisited: resolution of several typification and nomenclatural problems, including the generitype. Botanical Journal of the Linnean Society 141: 53–83.

http://dx.doi.org/10.1046/j.1095-8339.2003.00115.x

D'Hollander, E. & Caljon, A. (1978) Diatomées de l’Adrar Mauritanien. Bulletin de la Société Royale Botanique de Belgique 111 (1): 36–48.

Ehrenberg, C.G. (1843) Verbreitung und Einflufs des mikroskopischen Lebens in Süd- und Nord-Amerika. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1841: 291–445.

Foged, N. (1966) Freshwater diatoms from Ghana. Biologiske Skrifter udgivet af Det Kongelige Danske Videnskabernes Selskab 15 (1): 1–169.

Foged, N. (1986) Diatoms in Gambia. Bibliotheca Diatomologica 12: 1–153.

Fourtanier, E. & Kociolek, J.P. (2011) Catalogue of Diatom Names, California Academy of Sciences, On-line Version updated 19 Sept. 2011.—Available online at http://research.calacademy.org/research/diatoms/names/index.asp. Last accessed on 21/10/2013.

Fumanti, B., Ricci, S. & Alfinito, S. (1990) Freshwater algae from Sierra Leone: Diatoms from Guma Valley. Ricerche Biologiche in Sierra Leone (Parte III). Accademia Nazionale dei Lincei 265: 27–46.

Fumanti, B. (1994) Freshwater Algae from Sierra Leone: Diatoms from Bathurst Falls (Western Area). Ricerche Biologiche in Sierra Leone (Parte IV). Accademia Nazionale dei Lincei 267: 51–64.

Fusey, P. (1966) Florule algologique de la République Centrafricaine. Diatomées de quelques collections d'eau de la sous-préfecture de M'Baïki. Cahiers de la Maboké 4 (1): 55–67.

Greville, R.K. (1833) Diatomaceae. In: W.J. Hooker (ed.), The English Flora of Sir J.E. Smith. Longman, Rees, Orme, Brown, Green and Longman. London. 1824–1836, Vol. 5, Issue 1: 401–415, pl. 1.

Grunow, A. (1862) Die österreichischen Diatomaceen nebst Anschluss einiger neuen Arten von andern Lokalitäten und einer kritischen Uebersicht der bisher bekannten Gattungen und Arten. Erste Folge. Epithemieae, Meridioneae, Diatomeae, Entopyleae, Surirelleae, Amphipleureae. Zweite Folge. Familie Nitzschieae. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 12: 545–588.

Guermeur, P. (1954) Diatomées de l’A.O.F. (Première liste : Sénégal). Bulletin de l’Institut Français d’Afrique Noire. Catalogues 12: 1–137.

Hustedt, F. (1910) Beitrag zur Algenflora von Africa. Bacillariales aus Dahomé. Archiv für Hydrobiologie 5: 365–382.

Hustedt, F. (1935) Die fossile Diatomeenflora in den Ablagerungen des Tobasees auf Sumatra. Archiv für Hydrobiologie, Supplement 14: 143–192.

Hustedt, F. (1942) Süßwasser-Diatomeen des indomalayischen Archipels und der Hawaii-Inslen. Internationale Revue der gesamten Hydrobiologie und Hydrographie 42 (1/3): 1–252.

http://dx.doi.org/10.1002/iroh.19420420102

Hustedt, F. (1944) Neue und wenig bekannte Diatomeen. I. Berichte der Deutsche Botanisches Gesellschaft 61: 271–290.

Hustedt, F. (1956) Diatomeen aus dem Lago de Maracaibo in Venezuela. Ergebnisse der deutschen limnologischen Venezuela-Expedition 1952, 1: 93–140.

Hustedt, F. (1964) Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. In: L. Rabenhorst (ed.), Kryptogamen Flora von Deutschland, Österreich und der Schweiz. Akademische Verlagsgesellschaft m.b.h. Leipzig 7 (Teil 3, Lief. 4): 557–816.

Kusel-Fetzmann, E. (1968) Beiträge zur Kenntnis der Algenflora Ostafricanischer Hochgebirgsseen. Hochgebirgsforschung 1: 69–100.

Maillard, R. (1977) Diatomées d’eau douce du Mali, Afrique. Bulletin du Muséum National d’Histoire Naturelle. 3ème Série 443 (Botanique 30): 17–45.

Mayama, S. & Kawashima, A. (1998) New combinations for some taxa of Navicula and Stauroneis, and an avowed substitute for a taxon of Eunotia. Diatom 14: 69–71.

Mazzoni, A. (1986) Freshwater diatoms from Dankale River (Sierra Leone). Ricerche Biologiche in Sierra Leone (Parte II). Accademia nazionale dei Lincei 260: 105–119.

McNeill, J., Barrie, F.R., Buck, W.R., Demoulin, V., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Marhold, K., Prado, J., Prud'homme van Reine, W.F., Smith, G.F., Wiersema, J.H. & Turland, N.J. (2012) International Code of Nomenclature for algae, fungi, and plants (Melbourne Code). Regnum Vegetabile 154. Koeltz Scientific Books.

Medlin, L.K. & Kaczmarska, I. (2004) Evolution of the diatoms: V. Morphological and cytological support for the major clades and a taxonomic revision. Phycologia 43 (3): 245–270.

http://dx.doi.org/10.2216/i0031-8884-43-3-245.1

Mereschkowski, C. (1903) Uber Placoneis, ein neues Diatomeen-Genus. Beihefte zum Botanischen Centralblatt 15 (1): 1–30.

Metzeltin, D. & Lange-Bertalot, H. (1998) Tropical diatoms of South America I: About 700 predominantly rarely known or new taxa representative of the neotropical flora. Tropische Diatomeen in Südamerika I. 700 überwiegend wenig bekannte oder neue Taxa repräsentativ als Elemente der neotropischen Flora. Iconographia Diatomologica 5: 1–695.

Metzeltin, D., Lange-Bertalot, H. & García-Rodríguez, F. (2005) Diatoms of Uruguay. Compared with other taxa from South America and elsewhere. Iconographia Diatomologica 15: 1–736.

Mölder, K. (1962) Diatomeen aus den Gebirgen Sula und Kangari in Sierra Leone Westafrica. Bulletin de la Commission Géologique de Finlande 198: 7–48.

Müller, O. (1910) Bacillariaceen aus dem Nyassaland und einigen benachbarten Gebieten. IV Folge, Naviculoideae-Naviculeae-Naviculinae, Fragilarioideae-Fragilarieae-Fragilarineae, Fragilarioideae-Fragilarieae-Eunotiinae. (Engler's) Botanische Jahrbucher fur Systematik, Pflanzengeschichte, und Pflanzengeographie. Leipzig 45 (1): 69–122.

Obeng-Asamoa, E.K., John, D.M. & Appler, H.N. (1980) Periphyton in the Volta Lake. I. Seasonal changes on the trunks of flooded trees. Hydrobiologia 76: 191–200.

http://dx.doi.org/10.1007/bf00006209

Pinto, J.D.S. (1949) Planctontes do conteúdo gástrico de alguns Clupeídeos da Guiné Portuguesa. Anais da Junta de Investigações Coloniais, Lisboa 4: 29–46.

Ross, R., Cox, E.J., Karayeva, N.I., Mann, D.G., Paddock, T.B.B., Simonsen, R. & Sims, P.A. (1979): An amended terminology for the siliceous components of the diatom cell. Nova Hedwigia Beiheft 64: 513–533.

Round, F.E., Crawford, R.M. & Mann, D.G. (1990) The diatoms. Biology and morphology of the genera. 747 pp., Cambridge University Press, Cambridge.

Schmidt, A. et al. (1875) Atlas der Diatomaceen-kunde. Aschersleben, Commissions-Verlag Von Ludwig Siever’s Buchhandlung Series I (Heft 2): pls. 5–8

Schmidt, A. et al. (1936) Atlas der Diatomaceen-kunde. Leipzig. O.R. Reisland Series VIII (Heft 101-102): pls. 401–408.

Simonsen, R. (1987) Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Sow, E., Fofana, C.A.K., Sarr, R. & Sarr, B. (2006) Les diatomées fossiles du Lac Mbawane (Sénégal) : Inventaire floristique et paléoenvironnement. Symbiose 14: 27–34.

Sow, E., Fofana, C.A.K. & Sarr, R. (2008) Mise en évidence d’une période d’isolement du Lac Retba (Sénégal) entre 1200 et 250 B.P. par l’abondance de Paralia sulcata (Ehrenberg) Cleve. Journal des Sciences, Dakar 8 (2): 52–58.

Sow, E., Fofana, C.A.K., Aw, C. & Ndiaye, P.M. (2012) Impacts of marine influence and cultivation on the diatom flora of Thiaroye pond, Dakar, Senegal. African Journal of Aquatic Sciences 37 (2): 209–217.

http://dx.doi.org/10.2989/16085914.2012.672927

Van der Werff, A. (1955) A new method for cleaning and concentrating diatoms and other organisms. Verhandlungen der Internationalen Vereinigung für theoretische und angewandte Limnologie 12: 276–277.

Woodhead, N. & Tweed, R.D. (1956) A consideration of freshwater algae of Sierra Leone. Proceedings of the Linnean Society of London, Session 166, 1953-54, Pts 1 & 2: 81–86.

Woodhead, N. & Tweed, R.D. (1958) Freshwater Algae of Sierra Leone. I. New and unusual algae from the Sula Hills. Hydrobiologia 12 (2/3): 181–225.

http://dx.doi.org/10.1007/bf00034148

Zanon, V. (1941) Diatomee dell’Africa Occidentale Francese. Commentationes Pontificia Academia Scientiarum 5: 1–60.


Refbacks

  • There are currently no refbacks.


ISSN 1179-3155 (print); ISSN 1179-3163 (online)

Published by Magnolia Press, Auckland, New Zealand