Scanning electron micrograph showing tentacles on the head of a Hydra viridis. Epithelial cells located at the base of the tentacle are in a flat, contracted state. Cell distal to the head of the H. v...

Didinium captures Paramecium. Paramecium is almost completely ingested and the proboscis is beginning to reform. This micrograph was taken in 1968 by G. Antipa on a Cambridge Mark IIA operating at 20k...

This colorized scanning electron micrograph shows uncoated sponge spicules from a South African sponge. Spicules provide structural support and deter predators. The image was taken with the VcD (back...

of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Scanning electron micrograph of the epidermal surface of the flatfish sole Parophrys detulus shows a labyrinth of surface ridges. Image from Fahrenbach,...

Didinium captures Paramecium. At midingestion and showing metachronous waves of cilia within the two characteristic ciliary girdles of Didinium nasutum. This micrograph was taken in 1968 by G. Antipa ...

Scanning electron micrograph showing in vitro fertilization of a hamster oocyte. The sperm head, near the center of the field of view, is engulfed by the microvilli on the surface of the oocyte membr...

Scanning electron micrograph showing a lateral view of sperm penetration of a hamster oocyte during vitro fertilization. As the membrane of the sperm head fuses with that of the oocyte, the microvill...

Didinium captures Paramecium. After reeling in the prey with cyclosis tugging at the attached toxicysts the proboscis opens to engage the Paramecium. This micrograph was taken in 1968 by G. Antipa on ...

Cells from peritoneal cavity exudate of the mouse, exposed to sodium azide at 22°C for 22 minutes. The macrophage in the field of view has extended long microvilli, showing a rapid response to change...

Rapid extension of microvilli on the surface of a peritoneal macrophage, induced by treatment with a metabolic inhibitor, sodium azide, after 20 minutes at 22° C. Microvilli on neighboring lymphocyt...