The smaller, motile gametes are spermatozoa and the larger, non-motile gametes are ova. This increase in pregnancy rate occurs despite a lower value of total motile spermatozoa. The bacterium is a facultatively anaerobic, small, motile, gram negative, straight rod with flagella. "Euglena gracilis" is a motile, freshwater, photosynthetic flagellate. The organism is a facultative anaerobe and is catalase-positive and motile. If motile, they have a flagellum. Spirochetes gave rise to the motile features of eukaryotic cells. There are two types of cilia&colon; "motile" and "non-motile" cilia. The granulomas, consisting of motile cells, carry the eggs to the intestinal lumen. Non-motile bacteria cannot recognize surfaces or aggregate together as easily as motile bacteria. Pre- and post-concentration of motile sperm is counted. A wet preparation can be used to look for the motile trypanosomes. This addition nourishes the sperm in order to keep it active and motile. The embryonated eggs enter intestine where they hatch into motile oncospheres. Other important constituents include motile and sedentary Rotifers.