Oceili: A Celestial Compass in the Desert Ant Cataglyphis

  title={Oceili: A Celestial Compass in the Desert Ant Cataglyphis},
  author={Karl Fent and R{\"u}diger Wehner},
  pages={192 - 194}
In addition to multifaceted lateral compound eyes, most insects possess three frontal eyes called ocelli. Each ocellus has a single lens, as does the vertebrate eye. The ocelli of some flying insects, locusts and dragonflies, have been shown to function as horizon detectors involved in the visual stabilization of course. In a walking insect, the desert ant Cataglyphis, it is now shown that the ocelli can read compass information from the blue sky. When the ant's compound eyes are occluded and… 

Ocelli contribute to the encoding of celestial compass information in the Australian desert ant Melophorus bagoti

It is demonstrated that Melophorus bagoti could perceive and process celestial compass information for directional orientation with their ocelli, and the ocella do not seem to contribute to terrestrial landmark-based navigation in M. bagoti.

Ocellar spatial vision in Myrmecia ants.

Ocellar spatial vison improves significantly with input from the compound eyes, with a noticeably larger improvement in contrast sensitivity than in spatial resolving power.

Ocellar spatial vision in Myrmecia ants

Ocellar spatial vison improves significantly with input from the compound eyes, with a noticeably larger improvement in contrast sensitivity than in spatial resolving power.

Ocellar structure of African and Australian desert ants

The anatomical organisation of the ocelli in three species of desert ants is characterised and it is indicated that ocellar receptors are polarisation sensitive and are used to derive compass information from the pattern of polarised skylight.

Ocellar structure is driven by the mode of locomotion and activity time in Myrmecia ants

Investigation of different castes of closely related species of Myrmecia ants reveals that the structure of the simple eye, the ocelli, is influenced by the time at which animals are active and their mode of locomotion.

Compound eye and ocellar structure for walking and flying modes of locomotion in the Australian ant, Camponotus consobrinus

The structure of the compound eye and ocelli in pedestrian workers, alate females and alate males of an Australian ant, Camponotus consobrinus, is investigated, and the trade-offs involved in optical sensitivity and spatial resolution are discussed.

The role of ocelli in cockroach optomotor performance

This work investigated the possibility that the ocellar light stimulation changes the properties of the optomotor performance of the cockroach Periplaneta americana and measured the cuticular transmission, which, although relatively large, is unlikely to contribute profoundly to o cellar function, but may be significant in determining the mean activity level of completely blinded cockroaches.

The properties of the visual system in the Australian desert ant Melophorus bagoti.

Regional differences in the preferred e-vector orientation of honeybee ocellar photoreceptors

UV-sensitive photoreceptors are more strongly polarization sensitive than green photoreceptorors in honeybee ocelli; preferred e-vector orientation varies across the visual field with a preference for vertically polarized light along the equator.



Contribution of Compound Eyes and Ocelli to Steering Of Locusts in Flight: I. Behavioural Analysis

Locusts (Orthoptera, Acrididae) were tethered inside a simulated horizon visual display and head motions after ocellar cautery suggested that the ocelli may function synergistically with the compound eyes to minimize the delay of visual responses and augment visual responses when no sharp horizontal border is present.

An Ocellar Dorsal Light Response in a Dragonfly

Simple experiments are reported which give direct evidence that the ocelli do function as equilibrium organs during flight and identify the sensory organs which mediate the light evoked head movements.

The function of the insect ocellus.

  • D. Parry
  • Biology
    The Journal of experimental biology
  • 1947
The object of the present research was to obtain more knowledge of the function of the ocellus, primarily by recording the nervous response to ocellar stimulation by using the migratory locust to provide a preparation just large enough for electrodes to be placed on the ocells and electrical changes occurring there to be amplified and recorded.

Dorsal Light Receptors

This communication is a preliminary report of the possibility that the ocelli act as visual sensitivity adjusters in insects.

Bumblebee Ocelli and Navigation at Dusk

Western bumblebees fly straight while homing by polarized light, but zigzag when they use landmarks, which was used to determine the roles of the dorsal ocelli and parts of the compound eyes in homing.

What do the ants know about the rotation of the sky?

Animals which use a celestial compass to navigate in a particular direction are able to compensate for the movement of the Sun1–3. It has generally been assumed4–8 that this compensation is exact

Ocellar Input to the Flight Motor System of the Locust: Structure and Function

The pattern of connection is compatible with the hypothesis that a roll or downward pitch deviation induces compensating movements of the wings to correct the deviation, and the roles of the two pathways are discussed.

Die Orientierung der Honigbiene in der Dmmerung: Zugleich ein Beitrag zur Frage der Ocellenfunktion bei Bienen

1. Bienen aus dem gleichen Volk beenden abends ihre Sammeltatigkeit an einem vom Stock entfernt gelegenen Futterplatz (660 m, 1000 m, 3875 m) fruher als an einem nah gelegenen (25 m, 50 m).

For distances of more than I m from the start, the directions of the ants' mean orientation vectors are always significantly different from the direction of the spot of polarized light

  • 1965