This introduces the question of whether structural diversity of the cypris antennule
is correlated with the diversity of habitats and substrata used in settlement by cirripede species.
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.
A) Habitus, dorsal; B) Abdomen and caudal rami, dorsal; C) Right caudal ramus, dorsal; D) Right antennule
(arrowheads indicate naked setae on proximal segment), ventral.
These accumulated chemical compounds might cue the shrimp antennule
flicking, affecting their aesthetascs sensorial capability (Koehl 2006, 2011) and thus the detection of food attractants (de la Haye et al.
(Figure 2A) 8-segmented; armature formula: 1(1), 2(9), 3(7), 4(2+ (1+ae)), 5(2), 6(3), 7(4), 8(5+acrotek).
2A, 1S Antenna Small spines in protopod 6-7 Maxilliped 1 Coxa (S) nd Telson Outer spines 3 Pleon Dorsolateral processes (P) 2-4 G.
dubia in characters related to antennule
length compared to body length, but mainly to the shape and relative size of the genital double somite and other urosomal somites.
Olfactory responses of lobsters (Homarus americanus) to solutions from prey species and to seawater extracts and chemical fractions of fish muscle and effects of antennule
Sensory papilla of antennule
with nine aesthetascs, one of them larger, seven more subequal and one smaller.
sports thousands of hairlike odor sensors, which give the lobster an extraordinarily sensitive sense of smell by which to navigate.
Eight characters (body length, body width, eye diameter, rostrum width, length of flagellum on antennule
, length of flagellum on antenna, length of last peduncular article on antenna, and length of uropodal exopod) were measured on an approximately equal number of males and females in each of the two sampled years; sample sizes ranged from 10 to 34 per beach (Lessios et al.