Peranema (pear-o-knee-ma) is one of the better known gliding heterotrophic euglenids. The body is referred to as sac-shaped but this applies best to P. trichophorum, the most common species and the one illustrated here. At first glance, it would seem that there is just one flagellum, but careful observations, especially at high magnifications, reveal a second flagellum tightly adpressed to the body or lying in a groove in the body surface. The recurrent structure looks a little wider than the normal ridges of the body. The body is metabolic - meaning it squirms, and members of this genus have an ingestion organelle with which to manipulate food into the body. Differential interference contrast. This picture was taken by David Patterson, Linda Amaral Zettler and Virginia Edgcomb of materials from sediments of the marine site, Eel Pond in Austumn 2000, spring and summer 2001. Image copyright: D. J. Patterson, L. Amaral-Zettler and V. Edgcomb, image used under license to MBL (micro*scope).
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From the collection
Eel Pond, Woods Hole, Massachusetts
|Description of Peranema trichophorum: Cells are metabolic and 35 to 50 microns long, have longitudinal pellicular striations around the cell. The anterior end of the cell is slightly pointed and the posterior end is truncated, rounded, or indented. This body is slightly curved and the flagellar pocket is also to the right. The flagellar pocket including the flagellar canal is up to 40 % the length of the cell. The anterior flagellum is as long as the cell, is thick and is directed forward when the cell is moving. The posterior flagellum may be hard to observe, is thin, and tightly adpressed to the cell surface, lying in a narrow longitudinal groove. The ingestion organelle has two rods and is weakly developed. The nucleus is posterior to the centre of the cell. The cells glide in contact with the substratum. |