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New records of phytoplankton for Bangladesh: Division - Cryptophyta

The paper records 6 species of freshwater phytoplankton from the algal Division Cryptophyta. The species are Cryptomonas pyrenoidifera Geitler, C. caudata Schiller, C. tetrapyrenoidosa Skuja, Chroomonas breviciliata Nygaard, C. reflexa Kiss. and Cyathomonas truncata (Fres.) Fisch HP. These are newly recorded species from Sylhet Division of Bangladesh. Introduction The algal division Cryptophyta contains a small group of biflagellate organisms which are dorsiventrally flattened, asymmetric and free swimming (Bold and Wynne 1985). Most of them are planktonic and commonly called cryptomonad algae. In Bangladesh, a number of studies were carried out on this phytoplankton (Islam and Khondoker, 1997; Khondoker et al., 2007; Alfasane et al., 2010; Gani et al., 2014). So far, a total of 9 genera and 19 species were reported (Ahmed et al., 2009). The present authors while studying some samples of plankton collected from few oligoto meso-eutrophic aquatic habitats of Sylhet and Moulvibazar districts recognized the occurrence of cryptomonads phytoplankton. Further detailed taxonomic study on the samples, 6 species were found belonging to the division Cryptophyta and hitherto reported as new to the list of cryptomonads from Bangladesh. Materials and Methods The samples for the present study were collected from different parts of Shari Goyain River and Piyain River of Sylhet district and Madhabpur Lake of Moulvibazar district. Some water quality characteristics of the studied habitats ranged: water temperature from 17.7-30.7oC, 17.131. 3oC and 24.0-32.9 oC, respectively and pH from 6.8-8.9, 6.9-9.4 and 6.7-7.7, respectively. The samples of plankton were collected by hauling a plankton net of 20 μm mesh size. After collection those were preserved in 5% formalin. The microscopic study was performed with a Carl Zeiss Microscopy GmbH, Germany, Model: Axio Lab A1. Corresponding author: Email: <mujaddade@yahoo.com>