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2016 ; 6
(ä): 22331
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Compound eye and ocellar structure for walking and flying modes of locomotion in
the Australian ant, Camponotus consobrinus
#MMPMID26975481
Narendra A
; Ramirez-Esquivel F
; Ribi WA
Sci Rep
2016[Mar]; 6
(ä): 22331
PMID26975481
show ga
Ants are unusual among insects in that individuals of the same species within a
single colony have different modes of locomotion and tasks. We know from walking
ants that vision plays a significant role in guiding this behaviour, but we know
surprisingly little about the potential contribution of visual sensory structures
for a flying mode of locomotion. Here we investigate the structure of the
compound eye and ocelli in pedestrian workers, alate females and alate males of
an Australian ant, Camponotus consobrinus, and discuss the trade-offs involved in
optical sensitivity and spatial resolution. Male ants have more but smaller
ommatidia and the smallest interommatidial angles, which is most likely an
adaptation to visually track individual flying females. Both walking and flying
forms of ants have a similar proportion of specialized receptors sensitive to
polarized skylight, but the absolute number of these receptors varies, being
greatest in males. Ocelli are present only in the flying forms. Each ocellus
consists of a bipartite retina with a horizon-facing dorsal retina, which
contains retinula cells with long rhabdoms, and a sky-facing ventral retina with
shorter rhabdoms. We discuss the implications of these and their potential for
sensing the pattern of polarized skylight.