Five new species and one new variety of loricate euglenoid taxa were discovered in Thailand: Strombomonas starmachii Duangjan & Wołowski, S. chiangmaiensis Duangjan, Trachelomonas peerapornpisalii Duangjan & Wołowski, T. thailandicus Duangjan & Wołowski, T. reticulato-spinifera Duangjan and T. hystrix var. paucispinosa Prowse. We propose to raise the variety to species level [T. paucispinosa (Prowse) Duangjan & Wołowski, stat. et comb. nov.]. The morphology and fine lorica ultrastructure of the species are described. All taxa are documented by SEM images and some by LM micrographs.
Konrad Wołowski, Małgorzata Poniewozik and Patricia L. Walne
The biogeography and taxonomy of euglenophytes from the southeastern United States were studied in material from lakes, ponds and rivers of Alabama, Georgia, Kentucky, Mississippi, North Carolina and Tennessee. The 68 taxa found, 26 of which are new for this region, belong to the genera Euglena (26 taxa), Euglenaria (2), Lepocinclis (13), Phacus (25) and Monomorphina (2). The taxa occurred at low density, sometimes as a single specimen. Euglenophyte diversity was highest in ponds; rivers had the fewest taxa. Euglenophytes were present in most plankton samples.
This study examined wall ultrastructure variability in the microscopic green alga Pediastrum s.l. Its value as a diagnostic character is discussed. Field and cultured material of 21 taxa were compared using light and scanning electron microscopy. Nine ultrastructural elements occurring on the surface of Pediastrum are documented with LM and SEM micrographs. The highest number of taxa showed reticulate ornamentation composed of a trigonal mesh and granules situated on its corners. The paper considers the use of wall ultrastructure to reconcile traditional and modern taxonomical systems with regard to Pediastrum varieties, and addresses the phylogenetic relationships between strains representing different varieties.
Kritsana Duangjan, Konrad Wołowski and Yuwadee Peerapornpisal
The diversity of Phacus and Monomorphina (Euglenophyta) from northern Thailand was studied in various water bodies of Chiang Mai, Chiang Rai, Lamphun, Lampang and Phayao provinces. This paper presents 25 taxa of Phacus and 1 Monomorphina new for Thailand, including 3 Phacus taxa new for Southeast Asia. Several varieties and forms were recognized. All are briefly described, with original illustrations.
Konrad Wołowski, Kritsana Duangjan and Yuwadee Peerapornpisal
Colacium minimum Fott & Komárek, known so far from a few localities in Central Europe (Czech Republic), is reported here for the first time from Asia (Thailand). This epiphytic species was found growing on eight taxa of loricated euglenoids. The process of surface colonization of Trachelomonas Ehrenb. and Strombomonas Deflandre taxa by C. minimum in natural populations is briefly discussed and originally documented using LM and SEM.
Kritsana Duangjan, Yuwadee Peerapornpisal and Konrad Wołowski
Among 45 recorded heterotrophic (colorless) taxa of euglenoids, representatives of the genera Petalomonas F. Stein (12 taxa) and Peranema Dujard. (10 taxa) were abundant and showed high diversity. Less frequently identified were Anisonema Dujard. (3), Astasia Dujard. (1), Dinema Perty (2), Entosiphon F. Stein (1), Heteronema Dujard. (4), Menoidium Perty (2), Notosolenus A. Stokes (6), Ploeotia Dujard. (1), Rhabdomonas Fresen. (1) and Urceolus Mereschk. (2). Thirty of these taxa are reported for the first time from northern Thailand. Short descriptions, biogeographical data and original documentation based on light microscopy of living cells in natural communities are included for each reported taxon.