Coleps hirtus as illustrated in Shen & Zhang (1990) Biomonitoring Techniques Using Freshwater Microbiota, China Architecture and Building Press. This image was taken with permission from Modern Biomonitoring Techniques Using Freshwater Microbiota written by Shen Yunfen, Zhang Zongshe and colleagues, and published by China Architecture and Building Press in 1990. Image copyright: China Architecture and Building Press, used under license to MBL (micro*scope).
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From the collection
Protozoan biomonitors in China
|Description of Coleps hirtus: Scavenging ciliate, about 40-65 x 18-35 microns. Body covered in calcified armoured plates, usually barrel-shaped, rarely cylindrical. Armour consists of 6 plate rings (from anterior): circumoral plates, anterior collateral and main plates, posterior main and collateral plates, and circumanal plates. Each ring composed of 12-20, usually 15 or 16 plates. Collateral armour plates each with 2, main plates each with 4 windows, in total thus 12 windows per plate row and the windows are pretzel shaped, ridge at left plate margin finely crenellated, teeth of right plate margin alternately arranged to windows. One large spine at an anterior collateral plate and three or four prominent spines at rear end. Macronucleus globular, near mid-body. Contractile vacuole in posterior end. Extrusomes (toxicysts) difficult to recognize in living cells. Cells, especially armour, usually brown. No symbiotic green algae. 12-20, usually l5 or 16 meridional ciliary rows, each with four condensed cilia (pectinelles) at anterior end; cilia project from small, fusiform orifices between armour plates. One distinctly elongated caudal cilium. Oral opening at anterior end of cell, oral basket inconspicuous. Undulating membrane circular, composed of paired basal bodies, interrupted by three tiny adoral organelles. Movement without peculiarities, swims moderately rapidly. |