A mantis shrimp wearing sun‐glasses

Schiff, H.; Dore, Bruno Emilio; Donna, Daniela

doi:10.1080/11250000209356461

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…This tissue had been previously interpreted as a tissue providing total reflection of light (Schiff et al 2002). With new data it was observed that this tissue is not positioned frontally but at the inner border between the stalk and the cornea.…”

Section: Morphogenesis Of the Eyesmentioning

confidence: 89%

“…While the midband subserves colour and polarization vision (Cronin et al 2002), the two hemispheres of each single eye analyse sizes, shapes, distance and motion of the prey Iacino et al 1990;Schiff, 1997). Near to the midband ommatidia are skewed towards the midband such that visual fields overlap with those of the other half of the eye and with those of the midband ommatidia (Schiff et al 2002). These patterns of superposition of visual fields in the dorsal and ventral hemisphere depend on the region of the eye, and also on the sizes, shapes, location and motion of the object.…”

Section: Introductionmentioning

confidence: 99%

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Morphology of adaptation and morphogenesis in stomatopod eyes

Schiff¹,

Dore²,

Boido³

2007

Italian Journal of Zoology

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Ommatidia of eyes of stomatopods change with adaptation to light or dark. With dark adaptation the crystalline cones shorten and the retina becomes longer. This is due to contractions of myofibrils in veils surrounding the cones, while microtubules within the accessory pigment cells maintain the cytoarchitecture of the ommatidia. Here we describe the changes in Lysiosquillina maculata, a stomatopod living in an extremely bright habitat, which is compared to stomatopods from other ambient light conditions. The postlarval eye of stomatopods grows over the larval eye, gradually substituting it. Growth starts from a morphogenetic furrow at the inner border with the stalk. Similarly, in the adult eye as well at the inner margin between the stalk and the cornea, a morphogenetic furrow is inserted, which at its interior contains a proliferation tissue with clusters of developing ommatidia. At its distal side the proliferation tissue appears to generate the dioptric apparatus, i.e. veils, corneagenous cells and cones, and at its more proximal part the basement membrane, accessory pigment cells and retinular cells. The ommatidial components grow at different speeds.

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Section: Morphogenesis Of the Eyesmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Morphology of adaptation and morphogenesis in stomatopod eyes

Schiff¹,

Dore²,

Boido³

2007

Italian Journal of Zoology

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Photomechanical adaptation in the eyes ofSquilla mantis(Crustacea, Stomatopoda)

Dore¹,

Schiff²,

Boido

2005

Italian Journal of Zoology

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In the eye of Squilla mantis adapted to the dark the layer of the crystalline cones shortens and the retina becomes longer; the opposite occurs in light adaptation. With dark adaptation the acceptance angle becomes more than twice as large as in light adaptation. With this also the visual field of the ommatidium and the gaussian sensitivity function increase. Myofibrils between the crystalline cones are immersed in veils which are attached to the cornea. At the widest part of the cone a reinforced cone membrane folds inside; the fold contains a ring to which the veils are attached. This unique structure serves possibly as a harness to transfer the mechanical traction of the contractile structures to the cone. Around the distal, tapering part of the cone, the corneagenous cells could act as hydraulic shock-absorbing cushions. Six accessory pigment cells stretch between the distal retina and the basement membrane and contain myofibrils. The shortening of the cones during dark adaptation is presumably due to the contraction of the myofibrils in the veils and the simultaneous relaxation of those in the accessory pigment cells. In light adaptation the latter contract and the fibers in the veils relax.

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A mantis shrimp wearing sun‐glasses

Cited by 2 publications

References 17 publications

Morphology of adaptation and morphogenesis in stomatopod eyes

Morphology of adaptation and morphogenesis in stomatopod eyes

Photomechanical adaptation in the eyes ofSquilla mantis(Crustacea, Stomatopoda)

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