We measure 26 structural parameters in the antennules
, including the setae, and subject them to analysis by multivariate statistics.
Partially dissected material--habitus, right antennule
, labrum, and P5 of Leptocaris colombiana sp.
2B and 2E) was divided into two segmented parts: proximal part which had no orna-mentation in the form of scales but the basal podomere (plate) bears a large posterior spine, the second bears a pair of anterior spine with rounded tips, the third bears a pair of median spine, and the last podomere terminates in a hook; proximal part stout, first segment slightly curved, bearing large triangular posterior and anterior spines with rounded tips; second segment with hook-shaped spines bending toward abdomen, slender distal part of antennule
bearing anterior blunt knob, extending slightly beyond terminal spine, second segment of distal part half as long as first; terminal segment bearing about five to seven stout apical setae.
During this stage, the optical lobes, antennules
, antennas, mandibles, and abdomen were more distinct, and they lengthened and coalesced so that the abdomen was situated between the antennas and mandibles and immediately below the optical lobes (Fig.
Forms I would characterize as yellow, ivory, or rufous exhibited denser and more widely spread maculation on all parts of the body, including crisply annulated antennules
, dense pigmentation outlining the dorsal pronotal stripe, and denser and darker speckling on the head, pronotum, abdomen, and hind tarsi (Figs 3F, H, I.
The largest concentrations of tegumentary sensors are found on the antennules
, antennae, mouth appendages, and pereiopods, which most often encounter food and substrate (Anger 2001).
Thus, within the critical phase of the life cycle of the macroalga, the spores had attached to and grown upon different parts of the shrimp's cuticle, including antennules
proximal article more than 3x as long as wide, article 2 not longer than article 3.
Active at night, remaining buried in bottom sediment with only their eyes and antennules
, or "feelers," exposed during the day, they are highly mobile and can move great distances.
The trails reflect the animal width and are the result of digging by using its "paired appendages"; undoubtedly the antennules
which are long and bifid at Conchostraca.
We've spent a lot of effort characterizing how the antennules
move and how they sample in space," says Grasso.
Representational difference analysis (RDA) was previously performed to isolate 48 differentially expressed genes expressed in antennules
of blue-clawed (dominant) and yellow-clawed (subordinate) individuals.