Ulothrix zonata   (F. Weber & D. Mohr) Kutzing,  1833 (Algae)
Organism information awaits expert curation
Class: Ulvophyceae

Image copyrights: David John and Fabio Rindi

Size: Filaments 11-45 μm in diameter (filaments of indefinite length and extremely variable)

Filaments almost always attached by means of a holdfast. Rhizoids not observed at any stage of development, either in nature or culture. Two types of filaments, one with uniform width and the other with alternately widened and narrowed parts frequently noticed in nature. The widening in the filaments observed at the alternate septa is due to slight bulging on both sides of the filament. However, the bulging is also encountered at every septum or without any definite pattern. Longitudinal walls in between the septum also sometimes seen widened all along the length of filament resulting in filaments with wavy margins. Occasionally young filaments constricted at the septa also noticed. Filaments consisting of extremely short and/or coupled cells, or coupled cells of normal sizes also frequently noticed in nature.

Each cell contains a single more or less spherical nucleus located centrally or near the longitudinal wall. The nuclei range in diameter from 4.0-8.5 µm and encloses a solitary nucleolus.

Asexual reproduction takes place by vegetative fragmentation or by the production of 2-32 quadriflagellate zoospores produced within zoosporangia. The zoospores have a somewhat cup-shaped chloroplast containing 1-3 pyrenoids, a stigma and an anterior nucleus. Zoospores attached to the substratum by their anterior ends and secrete a holdfast upon germination.

Synonym (s)
Conferva zonata Weber & Mohr, 1804
(Homotypic synonym)
Oscillatoria torta C. Agardh, 1813
(Heterotypic synonym)
Lyngbya zonata (Weber & Mohr) Hassall, 1845
(Homotypic synonym)
Lyngbya zonata (Weber & Mohr) Hassall ex Gomont, 1892
(Homotypic synonym)
Sphaeroplea crispa Berkeley, 1832
(Heterotypic synonym)
Ulothrix inaequalis Kutzing, 1845
(Heterotypic synonym)
Ulothrix crispa (Berkeley) Kutzing, 1849
(Heterotypic synonym)
Hormiscia zonata var. inaequalis (Kutzing) Rabenhorst, 1864
(Heterotypic synonym)

Common Name (s)
Economic Importance and Threats

Habitat:  Estuarine, Coastal


• Karnataka, Gurupur Estuary INDIA (Record: 01/1993-12/1993)
• Tamil Nadu, Adyar Estuary (Lat: 13.01) (Long: 80.28) INDIA (Record: 04/1998-03/1999)
• Tamil Nadu, Cooum Estuary (Lat: 13.16) (Long: 80.26) INDIA (Record: 04/1998-03/1999)
• Kerala, Balathuruthu INDIA

Literature Source(s)
  • Gowda, G; Gupta, TRC; Rajesh, KM and Mendon, MR (2002) Primary productivity in relation to chlorophyll a and phytoplankton in Gurupur estuary Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin 44 (1 & 2) 14-21 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • (2006) Algaebase Available at - http://www.algaebase.org/
  • Eswari, YNK and Ramani Bai, R (2002) Distribution and abundance of phytoplankton in the estuarine waters of Chennai, south east coast of India Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin 44(1 & 2) 205-211 Available at - NIO, Goa
  • Shyam, R and Saxena, PN (1980) Morphological and cytological investigations of Ulothrix zonata and taxonomy of the related species Plant Systematics and Evolution Springer Wien 135(3-4) 151-158 Available at - http://www.springerlink.com/content/h722vl5521v47406/fulltext.pdf
  • Biswas, K (1948) Common fresh & brackish water algal flora of India & Burma Records of the Botanical Survey of India Periodical Expert Book Agency, Delhi, India 15(1) 125 pp Available at - NIO, Goa
  • Sanilkumar, M G; Dr.Joseph, K J; Dr. Saramma, A V (2009) Planktonic Microalgae Microalgae in the Southwest Coast of India 34-114 Available at - http://dyuthi.cusat.ac.in/xmlui/purl/1922

Page last updated on:2011-01-07

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