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Genomics, transcriptomics, and peptidomics of Daphnia pulex neuropeptides and protein hormones.
We report 43 novel genes in the water flea Daphnia pulex encoding 73 predicted neuropeptide and protein hormones as partly confirmed by RT-PCR. MALDI-TOF mass spectrometry identified 40 neuropeptides
Circadian clocks in crustaceans: identified neuronal and cellular systems.
Cellular systems for regulation summarised here comprise the retina, the eyestalk neuroendocrine X-organ-sinus gland system, several neuropeptides such as red pigment concentrating, hyperglycaemic and pigment-dispersing hormones, and factors such as serotonin and melatonin.
Evolutionary and Phylogenetic Origins of Tympanal Hearing Organs in Insects
Research on insect hearing is embeded in a phylogenetic framework to reconstruct the ancestral sensory situation in different taxa, and the series of morphological changes during the evolution of an ear.
Neuroanatomy and Physiology of the Complex Tibial Organ of an Atympanate Ensiferan, Ametrus tibialis (Brunner von Wattenwyl, 1888) (Gryllacrididae, Orthoptera) and Evolutionary Implications
Based on comparison of neuroanatomical details, the crista acustica homologue of A. tibialis could present the neuronal complement of an ear evolutionary precursor structure, which was successively made sensitive to airborne sound by elaboration of cuticular tympana, auditory spiracle and trachea for sound propagation.
Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity
This simple PDH system shows striking homologies to PDH systems in decapod crustaceans and well-known clock neurons in several insects, which suggests evolutionary conservation of an ancient peptidergic interneuronal system that is part of biological clocks.
Selective forces on origin, adaptation and reduction of tympanal ears in insects
This review summarises what is known about the evolutionary origin of ears and the presumed precursor organs in the various insect groups, and focuses on selective forces for making and keeping an ear.
Neuroanatomy of the complex tibial organ in the splay‐footed cricket Comicus calcaris Irish 1986 (Orthoptera: Ensifera: Schizodactylidae)
The tibial organ is documented in the nonhearing splay‐footed cricket Comicus calcaris, and the neuroanatomy is discussed with respect to stridulation behavior and the evolutionary origin of hearing in Ensifera.
Spatial organization of tettigoniid auditory receptors: Insights from neuronal tracing
A substantial part of auditory receptors can deviate from a strictly straight organization into a more complex morphology, and the crowded arrangement of receptor somata and dendrites may result from functional constraints relating to frequency discrimination, or from developmental constraints of auditory morphogenesis in postembryonic development.
Listening when there is no sexual signalling? Maintenance of hearing in the asexual bushcricket Poecilimon intermedius
It is shown that hearing is clearly maintained in the parthenogenetic females of the bushcricket Poecilimon intermedius, and natural selection by acoustic hunting bats, pleiotropy or a developmental trap may explain the well maintained hearing function.
Sensory evolution of hearing in tettigoniids with differing communication systems
A significant reduction in auditory structures is shown, shaped by the differing sex roles during mate detection, in the Tettigoniidae genus Poecilimon.