Sentences with phrase «evolved filamentous»
The worms are capable of sucking out the sperm following copulation, but some worms have evolved filamentous structures on the sperm heads help protect against such manipulation by anchoring the sperm inside the antrum.
https://www.the-scientist.com/ Not exact matches
Although the best evidence for feathers has been found in a group of meat - eating dinosaurs dating back to about 150 million years ago, and from which birds apparently evolved at about the same time, there have been sightings of bristly, filamentous structures in very distantly related plant - eating dinosaurs as well.
However, inseminated worms will often suction the sperm out of their female genital opening using their mouth when copulation is over.3 Some worms have also evolved countermeasures against such rejection: filamentous structures on the side of the sperm heads that anchor the genetic packages into the body cavity.4 (See illustration.)