Donaldson noted that the DMF muffler employs series-mounted, flow-through filters capable of reducing tailpipe emissions of particulate matter by 70 percent, with application of the Spiracle
crankcase filter bringing total engine reductions to nearly 80 percent.
I immobile, but alive, reacting to irritation, spiracles
beginning to work actively after being placed in seawater.
Xenopus tadpoles were used because they have a spiracle
on both sides which might help determine the role of the spiracle
in forelimb emergence.
setiform and well developed (length: 0.23 mm).
conspicua has four pairs of terminal papillae (larva) and a shorter prothoracic spiracle
, while the new species presents only two pairs of terminal papillae and a longer prothoracic spiracle
(iii) Character number 3--female with spiracle
on eighth abdominal segment opening on membrane (versus on tergite).
15) with tergite I smooth, with lateromedian longitudinal carinae quite strong, present on anterior 0.6; tergite I in lateral view, with spiracle
positioned anterior to centre, about 0.3 of way along, base with a rather rounded lateral tooth, margin pointing laterally (Fig.
sare holes in the side of the body which help in the exchange of oxygen and carbon dioxide as part of re spiration.
I shorter than spiracles
on segments II and IV equal in size; spiraeles on segments V and VI equal in size; spiracle
of segments VII and VIII larger than preceding spiracles
Through stages P9-P14, intense stain was associated with the anterior spiracle
region, along the line of the first dorsal anastomosis and into the dorsal tracheal trunks [ILLUSTRATION FOR FIGURE 6F OMITTED] (anatomy after Whitten, 1980).
Thorax: upper and lower frontal horn absent, a pair of lower facial papillae (one setose and one bare) each side of midline, three lateral papillae (one setose and two bare) each side of midline, prothoracic spiracle
cylindrical, 0.9 mm (Figure 10); wing reaching fourth abdominal segment; first and third pairs of legs reaching seventh abdominal segment, second pair reaching eighth.
The lateral view shows the horizontal propodeal spiracle
on the lateropropodeum.