Morphology of the Nervous System of Barnacles: the Median Ocellus of<i>Balanus Hameri (=Chirona Hameri)</i>(Crustacea: Cirripedia)

Clare, Anthony S.; Walker, Graham C.

doi:10.1017/s0025315400032148

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…The nauplius eye of barnacles is composed of three components (3,12). Kauri (12) has noted that the nauplius eye of The conclusions of the present study are summarized schematically in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The view is generally held, although in the absence of detailed investigations of the metamorphosing larvae, that the adult photoreceptors are derived from components of the nauplius eye (5, 6, 9, 21). However, it has been pointed out that there are considerable differences in the number, size and organization of visual cells between the adult and larval photoreceptors (3,7,(11)(12)(13)(14). Further, Bernard and Lane (1) suggested that the larval ocellus did not develop directly into the adult photoreceptors.…”

Section: Introductionmentioning

confidence: 99%

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Remodeling of the Nauplius Eye into the Adult Ocelli during Metamorphosis of the Barnacle, Balanus amphitrite hawaiiensis

et al. 1993

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The planktonic barnacle larva has a single median ocellus (nauplius eye), while the adult possesses two distinct sets of photoreceptors; a pair of lateral ocelli and a single median ocellus. The nauplius eye of the cypris larva of Balanus amphitrite hawaiiensis is composed of 14 visual cells grouped into three components (a pair of lateral components and a single ventral component) surrounding two centrally located pigment cells; each lateral component consists of 5 visual cells and the ventral component, 4 visual cells. In each component, the rhabdom is made up of apposing microvilli arising directly from the neighboring visual cell bodies. During metamorphosis into the adult form, the three components of the median ocellus become separated. Each lateral component migrates laterally on the mantle and is remodeled into the adult lateral ocellus, losing two visual cells but gaining new pigment and tapetum cells in the process. The ventral component remains in the mid portion and becomes the adult median ocellus without fundamental modification in composition. The visual cells in both ocelli undergo a marked increase in volume and form many finger‐like dendrites. Rhabdomes are made up of interdigitating microvilli arising from the the dendrite tips.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Remodeling of the Nauplius Eye into the Adult Ocelli during Metamorphosis of the Barnacle, Balanus amphitrite hawaiiensis

et al. 1993

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“…The photoreceptors are subdivided by these pigment cells into three groups that "look" in three different directions. The pigment cells are shaped to form three cups, and within each cup are two to six photoreceptors, termed retinular cells (Kauri, 1962;Walley, 1969;Walker et til., 1987;Clare and Walker. 1989).…”

Section: Autoradiography Of Naiiplius Lar\-aementioning

confidence: 99%

Uptake of the Neurotransmitter Histamine into the Eyes of Larvae of the Barnacle (Balanus amphitrite)

Stuart

Mekeel

Kempter

2002

The Biological Bulletin

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The photoreceptors of adult barnacles use histamine as their neurotransmitter and take up (3)H-histamine selectively from the extracellular medium. We assayed for the uptake of (3)H-histamine into the eyes of the free-swimming (nauplius) and settling (cyprid) larval stages of Balanus amphitrite. The extracellular space of nauplii proved permeable to dyes below about 800 molecular weight (MW), indicating that (3)H-histamine (MW 111) introduced into seawater would have access to internal structures. (3)H-Histamine was taken up into nauplii by a process with a K(D) of 0.32 microM. Uptake was antagonized by chlorpromazine, which also blocks uptake of (3)H-histamine into adult photoreceptors. In autoradiographs of serial sections of nauplii and cyprids incubated in (3)H-histamine, the ocelli and compound eyes were labeled; other structures in the animal were not. No eyes or other structures were labeled with (3)H-serotonin, a related amine whose transporter commonly transports histamine as well. These experiments show that a histamine-specific transporter similar to that found in the adult is expressed in all of the eyes of barnacle larvae. In the ocelli, where photoreceptors and pigment cells may be distinguished in the light microscope, label was unexpectedly concentrated far more over the pigment cells than over the photoreceptors.

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The frontal eyes of crustaceans

Elofsson

2006

Arthropod Structure & Development

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Morphology of the Nervous System of Barnacles: the Median Ocellus ofBalanus Hameri (=Chirona Hameri)(Crustacea: Cirripedia)

Cited by 8 publications

References 29 publications

Remodeling of the Nauplius Eye into the Adult Ocelli during Metamorphosis of the Barnacle, Balanus amphitrite hawaiiensis

Remodeling of the Nauplius Eye into the Adult Ocelli during Metamorphosis of the Barnacle, Balanus amphitrite hawaiiensis

Uptake of the Neurotransmitter Histamine into the Eyes of Larvae of the Barnacle (Balanus amphitrite)

The frontal eyes of crustaceans

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