Sexual Dimorphism in the Compound Eye of Rhagophthalmus ohbai (Coleoptera: Rhagophthalmidae): II. Physiology and Function of the Eye of the Male

Lau, Ting Fan; Ohba, Norio; Arikawa, Kentaro; Meyer-Rochow, Victor Benno

doi:10.1016/s1226-8615(08)60327-1

Cited by 14 publications

(18 citation statements)

References 30 publications

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“…Sexual size dimorphism is well documented in insect compound eyes (Meyer-Rochow and Reid, 1994;Lau et al, 2007;MeyerRochow and Lau, 2008), especially in Diptera, where males in several groups have larger eyes than females, probably because of the need for males to find females (Wehrhahn, 1979;Straw et al, 2006). In the butterfly Bicyclus anynana, the relative eye sizes of males and females are sexually dimorphic and differ according to the time of year together with opsin expression levels (Everett et al, 2012;Macias-Muñoz et al, 2015).…”

Section: Uv Photoreceptors and Sexual Dimorphismmentioning

confidence: 99%

“…Among vertebrates, in most New World primate species, a proportion of females can be trichromats, whereas all males are dichromats (Mollon et al, 1984). Males and females of the beetle Rhagophthalmus ohbai have different electroretinogram (ERG) response peaks, but opsin expression in the eyes is unknown (Lau et al, 2007). Several butterflies have sexually dimorphic spectral sensitivities due to lateral filtering pigments, which may be related to wing pattern dichromatism.…”

Section: Uv Photoreceptors and Sexual Dimorphismmentioning

confidence: 99%

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Sexual dimorphism in the compound eye of Heliconius erato: a nymphalid butterfly with at least five spectral classes of photoreceptor

McCulloch

Osorio

Briscoe

2016

Journal of Experimental Biology

122

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Most butterfly families expand the number of spectrally distinct photoreceptors in their compound eye by opsin gene duplications together with lateral filter pigments; however, most nymphalid genera have limited diversity, with only three or four spectral types of photoreceptor. Here, we examined the spatial pattern of opsin expression and photoreceptor spectral sensitivities in Heliconius erato, a nymphalid with duplicate ultraviolet opsin genes, UVRh1 and UVRh2. We found that the H. erato compound eye is sexually dimorphic. Females express the two UV opsin proteins in separate photoreceptors, but males do not express UVRh1. Intracellular recordings confirmed that females have three short wavelengthsensitive photoreceptors (λ max =356, ∼390 and 470 nm), while males have two (λ max =390 and ∼470 nm). We also found two long wavelength-sensitive photoreceptors (green, λ max ∼555 nm, and red, λ max ∼600 nm), which express the same LW opsin. The red cell's shifted sensitivity is probably due to perirhabdomal filtering pigments. Sexual dimorphism of the UV-absorbing rhodopsins may reflect the females' need to discriminate conspecifics from co-mimics. Red-green color vision may be used to detect differences in red coloration on Heliconius wings, or for host-plant identification. Among nymphalids so far investigated, only H. erato is known to possess five spectral classes of photoreceptor; sexual dimorphism of the eye via suppression of one class of opsin (here UVRh1 in males) has not -to our knowledge -been reported in any animal.

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Section: Uv Photoreceptors and Sexual Dimorphismmentioning

confidence: 99%

Section: Uv Photoreceptors and Sexual Dimorphismmentioning

confidence: 99%

Sexual dimorphism in the compound eye of Heliconius erato: a nymphalid butterfly with at least five spectral classes of photoreceptor

McCulloch

Osorio

Briscoe

2016

Journal of Experimental Biology

122

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“…splendidula are unidentifiable based on stainings with a synapsin antibody or with phalloidin, and become barely visible in stainings with a TKRP antibody (Fig 4J). The small ALs with elusive glomerular boundaries and small calyces possibly reflect a reduced need for olfaction in the adult animals, which do not feed during their short life span (it even lacks developed mouthparts) and that find their mating partners primarily by visual cues [131,132]. Similar observations are known from the heteropteran Diceroprocta semicincta , which lives up to 17 years underground as feeding nymph before emerging as non-feeding, reproducing adult.…”

Section: Discussionmentioning

confidence: 88%

Variations on a Theme: Antennal Lobe Architecture across Coleoptera

et al. 2016

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Beetles comprise about 400,000 described species, nearly one third of all known animal species. The enormous success of the order Coleoptera is reflected by a rich diversity of lifestyles, behaviors, morphological, and physiological adaptions. All these evolutionary adaptions that have been driven by a variety of parameters over the last about 300 million years, make the Coleoptera an ideal field to study the evolution of the brain on the interface between the basic bauplan of the insect brain and the adaptions that occurred. In the current study we concentrated on the paired antennal lobes (AL), the part of the brain that is typically responsible for the first processing of olfactory information collected from olfactory sensilla on antenna and mouthparts. We analyzed 63 beetle species from 22 different families and thus provide an extensive comparison of principal neuroarchitecture of the AL. On the examined anatomical level, we found a broad diversity including AL containing a wide range of glomeruli numbers reaching from 50 to 150 glomeruli and several species with numerous small glomeruli, resembling the microglomerular design described in acridid grasshoppers and diving beetles, and substructures within the glomeruli that have to date only been described for the small hive beetle, Aethina tumida. A first comparison of the various anatomical features of the AL with available descriptions of lifestyle and behaviors did so far not reveal useful correlations. In summary, the current study provides a solid basis for further studies to unravel mechanisms that are basic to evolutionary adaptions of the insect olfactory system.

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“…What the investigations by Lau and Meyer‐Rochow (), Lau et al . (,b), and Meyer‐Rochow and Lau () as well as those by Zeil () have shown is that males often possess larger eyes with more facets than their females and that ultrastructural differences occur, involving predominantly the width of the clear‐zone, the size of the rhabdom and its volume as well as the extent of the reflecting tapetum. Eyes of males and females, at least in Operophthera brumata , (Fig.…”

Section: Compound Eye Research Suggestionsmentioning

confidence: 92%

“…Coloration like that is frequently seen in some Orthoptera, Diptera, and Lepidoptera and has even been reported from the eyes of certain species of hermit crab, but apart from a few studies (Lunau & Knüttel, 1995;Stavenga, 2002) the phenomenon has not received a great deal of attention. Insect corneae can be very thick in relation to the total length of the ommatidium (as in the buprestid Curis caloptera; Gokan & Meyer-Rochow, 1984 and the fungus beetle Neotriplax lewisi; Mishra & Meyer-Rochow, 2006a) or they may be rather thin as, for instance, in the parasitoid tiny wasp Trichogramma evanescens (Fischer et al, 2011) or the moth Acentria ephemerella (Lau et al, 2007a). Often aquatic species have thinner corneae (e.g., Panulirus longipes; Meyer-Rochow, 1975a) than terrestrial species of identical sizes (Thiele, 1971).…”

Section: Corneal Surface Structures and Their Functionsmentioning

confidence: 99%

Compound eyes of insects and crustaceans: Some examples that show there is still a lot of work left to be done

Meyer-Rochow

2014

Insect Science

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Similarities and differences between the 2 main kinds of compound eye (apposition and superposition) are briefly explained before several promising topics for research on compound eyes are being introduced. Research on the embryology and molecular control of the development of the insect clear-zone eye with superposition optics is one of the suggestions, because almost all of the developmental work on insect eyes in the past has focused on eyes with apposition optics. Age- and habitat-related ultrastructural studies of the retinal organization are another suggestion and the deer cad Lipoptena cervi, which has an aerial phase during which it is winged followed by a several months long parasitic phase during which it is wingless, is mentioned as a candidate species. Sexual dimorphism expressing itself in many species as a difference in eye structure and function provides another promising field for compound eye researchers and so is a focus on compound eye miniaturization in very small insects, especially those that are aquatic and belong to species, in which clear-zone eyes are diagnostic or are tiny insects that are not aquatic, but belong to taxa like the Diptera for instance, in which open rather than closed rhabdoms are the rule. Structures like interommatidial hairs and glands as well as corneal microridges are yet another field that could yield interesting results and in the past has received insufficient consideration. Finally, the dearth of information on distance vision and depth perception is mentioned and a plea is made to examine the photic environment inside the foam shelters of spittle bugs, chrysales of pupae and other structures shielding insects and crustaceans.

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Sexual Dimorphism in the Compound Eye of Rhagophthalmus ohbai (Coleoptera: Rhagophthalmidae): II. Physiology and Function of the Eye of the Male

Cited by 14 publications

References 30 publications

Sexual dimorphism in the compound eye of Heliconius erato: a nymphalid butterfly with at least five spectral classes of photoreceptor

Sexual dimorphism in the compound eye of Heliconius erato: a nymphalid butterfly with at least five spectral classes of photoreceptor

Variations on a Theme: Antennal Lobe Architecture across Coleoptera

Compound eyes of insects and crustaceans: Some examples that show there is still a lot of work left to be done

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