head shield

head shield

[′hed ‚shēld]
(invertebrate zoology)
A conspicuous structure arching over the lips of certain nematodes.
References in periodicals archive ?
Tenders Are Invited For Spectacle Type Goggle With Blue Lens,Canvas Hand Sleeves,Safety Helmet With Face Shield,Welding Head Shield
Our Purple Swamphen is a big bird some 45 cm long, bright purple throughout with a green back and bright crimson legs and bill -- including a stonking great head shield. Its rear is bright white, an important feature as it is this that is often your only view of the bird as it heads for cover in the dense reed beds it calls home.
In the wake of an accident in Cornwall, Ontario, in 1999, the Transportation Safety Board of Canada (TSB) concluded, "In general, Class 111A tank cars do not have sufficient protection against punctures, even in a low-speed impact, due to the thinness of the tank shell and the absence of a head shield." Since 2011, the federal government has required transport firms to opt for thicker tank car shells, but in practice there is nothing to impede the use of older models.
Surprisingly well are represented also such bones of the head shield as nuchal (Nu), lateral (La) and premedian (Prm) plates, and even complete head shields form 21.4% of the expected number of the heads (which should be 28 according to the MNI).
They include an unnamed worm; Stanleycaris hirpex, a segmented shrimplike critter known as an anomalocarid; and an arthropod with big eyes dangling on stalks from its head shield.
Chief Large Stockman features genuine coffee-bone handle scales, 440 stainless steel bolsters, liners, pins, blades and a detailed Indian head shield. The Stockman measures 4" closed.
Meanwhile, an officer attacked in Mountjoy needs surgery after he was hit by a missile that went through his head shield, shattered his teeth and damaged the bridge of his nose.
Welders wear protective clothing including head shield with protective glass, overalls, apron and gloves.
The notochord penetrated the brain case to the level of the pituitary gland, and a series of extrascapular dermal shoulder girdle bones were attached to the dermal head shield. The pelvic girdle was not even attached to the vertebral column.
Overalls, steel toe-capped boots, leather apron, head shield and leather gloves are all essential kit.
The injured officer was hit by a missile that went through his protective head shield shattering his teeth and damaging the bridge of his nose.