Selden (1984) considered the possible function of pterygotid chelicera, concluding that the animals could rapidly extend these organs during hunting and that the curved tip and multiple denticles
of the chelicerae were effective in cutting up prey.
(2005), trichodinids are one of the most common parasitic ciliates that are well characterized by two main features: the morphology of the denticles
in the adhesive disc and the development of the adoral ciliary spiral.
Male (holotype): Median ocellus almost as wide as long; apex of anterior denticle
on vertex narrow and bifurcate; middle denticle
widely oval in profile; posterior denticle
high, spine-like, and with apical part rather thin and directed upward (Fig.
A characteristic feature of genuine denticles
is their similarity to dentin .
It is now flanked by four lateral teeth each 4.2 [micro]m wide, 12.7 [micro]m long, and ending with 5-6 short denticles
, all similar in length.
Its general morphology is bladelike, laterally-compressed and it is possible to observe the trace of denticles
that have been eroded.
In homozygous [hth.sup.C1] embryos, A1 shows an A5-like phenotype and the thoracic segments show an abdominal-like phenotype in the denticle
patterns of the larval cuticles .
were not observed on any of the prearticular plates.
The anterior process is blade-like, with fused high uneven denticles
and with a ledge on the aboral margin.
Because the tail is used during tadpole foraging to swim and force the tadpole's rasping mouth against substrates, a longer tail might increase the force on the scraping denticles
. This increased force could permit wood frog tadpoles to scrape a type of periphyton that is more resistant to harvest or to harvest periphyton more efficiently.
The next step is to experiment with different denticle
shapes "once we think we understand the parameters that actually improve the performance," Lauder said.