Search results
Results from the WOW.Com Content Network
Worms vary in size from microscopic to over 1 metre (3.3 ft) in length for marine polychaete worms (bristle worms); [1] 6.7 metres (22 ft) for the African giant earthworm, Microchaetus rappi; [2] and 58 metres (190 ft) for the marine nemertean worm (bootlace worm), Lineus longissimus. [3]
Thus each worm becomes the genetic father of some of their offspring (due to its own sperm transferred to other earthworm) and the genetic mother (offsprings from its own egg cells) of the rest. As the worm slips out of the ring, the ends of the cocoon seal to form a vaguely onion-shaped incubator in which the embryonic worms develop. Hence ...
The worm has a hydrostatic skeleton and moves by longitudinal and circular muscular contractions. Setae – tiny hair-like projections – provide leverage against the surrounding soil. Surface movements on moist, flat terrain were reported at a speed of 20 m/h and, based on measurements of the length of the trail, nocturnal activity away from ...
The pinworm (species Enterobius vermicularis), also known as threadworm (in the United Kingdom, Australia and New Zealand) or seatworm, is a parasitic worm.It is a nematode (roundworm) and a common intestinal parasite or helminth, especially in humans. [7]
Sensory papillae covering the exterior of a velvet worm. Papillae (sg.: papilla) are small, protruding structures found on the surface of certain worms, specifically polychaetes and onychophorans. [1] In polychaetes, these papillae are tiny, fleshy projections on the worm's body or parapodia, often associated with sensory and locomotive ...
Earthworm with clitellum lablelled. Close-up of the clitellum of a Lumbricus rubellus. The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches that secretes a viscid sac in which eggs are stored. [1]
An example of a simple Deuterostome containing a hydrostatic skeleton would be Enteropneusta, with the common name of acorn worm. This organism is classified as a Hemichordate, and they are marine worms that use their hydrostatic skeleton to tunnel and anchor themselves into the ground. This can be used for locomotion, but also can aid in the ...
A diagram of the inner organs of an annelid worm showing the metanephridia and both nephrostomes in one of the animal's segments. The nephrostome [1] is the funnel-like component of a metanephridium. It is always oriented towards the coelom.