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Characterisation and localisation of the opsin protein repertoire in the brain and retinas of a spider and an onychophoran
The novel finding that opsins of both the ciliary and rhabdomeric type are present in the onychophoran and a spider suggests that these two types of opsins werePresent in the last common ancestor of the OnyChophora and Euarthropoda. Expand
Brightness discrimination ability in the West Indian manatee (Trichechus manatus).
Two manatees were tested on their ability to discriminate brightness using a series of 30 shades of grey varying from white to black, and the calculated Werber fraction is 0.35. Expand
Different functions of different eye types in the spider Cupiennius salei.
  • A. Schmid
  • Biology, Medicine
  • The Journal of experimental biology
  • 15 January 1998
The Central American hunting spider Cupiennius salei Keys relies mainly on its mechanosensory systems during prey-catching and mating behaviour, and it seems most likely that the animals separate visual information in the periphery and therefore that the eyes have different functions. Expand
Differential expression of retinal determination genes in the principal and secondary eyes of Cupiennius salei Keyserling (1877)
Principle eye development shows pax 6a (ey) expression, suggesting pax6 dependence, although secondary eyes develop independently of pax8 genes and show differential expression of several retinal determination genes. Expand
Color Vision in the Manatee (Trichechus manatus)
Manatees possess color vision which is most likely dichromatic, and could not discriminate between a UV-reflecting white target and an UV-absorbing white target. Expand
Histamine immunoreactivity in the central nervous system of the spider Cupiennius salei
It is suggested that histamine is a neurotransmitter of photoreceptors in all arthropods, since it is also known to occur in the photoreceptor taxa of the other main arthropod taxa (Merostomata, Crustacea, and Insecta). Expand
Distribution of γ-aminobutyric acid-, proctolin-, Periplaneta hypertrehalosaemic hormone- and FMRFamide-like immunoreactivity in the visual ganglia of the spider Cupiennius salei Keys.
It is probable, that the staining patterns of the four tested antisera indicate the existence of a neuronal substrate used for different functions in information processing between principal and secondary eyes. Expand
Brightness discrimination and neutral point testing in the horse
Equine brightness discrimination ability and color discrimination were measured using a two-choice discrimination task and two Haflinger horses were trained to discriminate3. Expand
Spectral sensitivity and Color Vision in the Bottlenose Dolphin (Tursiops Truncatus)
Two wavelength discrimination tasks showed that the dolphin could discriminate two wavelengths from the peak regions of the two maxima of the spectral sensitivity function, but not between two wavelengths lying within the broad maximum of the curve in the bluegreen part of the spectrum. Expand
Leucokinin-like immunoreactive neurones in the central nervous system of the spider Cupiennius salei
A specific antiserum immunoreactive to the neuroactive octapeptide leucokinin I (LKI) has been used to map neurones within the central nervous system of the central American wandering spider Cupiennius salei. Expand