The Cornucopia of Copepod Eyes: The Evolution of Extreme Visual System Novelty

Steck, Mireille; Theam, Kristina C.; Porter, Megan L.

doi:10.1007/978-3-031-23216-9_9

Springer Series in Vision Research

2023

DOI: 10.1007/978-3-031-23216-9_9

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The Cornucopia of Copepod Eyes: The Evolution of Extreme Visual System Novelty

Mireille Steck

Kristina C. Theam²,

Megan L. Porter³

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2024

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Cited by 2 publications

References 116 publications

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Structure and functional implications of photoreceptive systems in non-marine ostracods: a review

Bellavere,

Matzke-Karasz,

Romano

et al. 2024

Hydrobiologia

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Ostracods are small, bivalved crustaceans living in all types of aquatic habitats. All non-marine species belong to the order Podocopida. They usually possess a simple optical system composed of three eyecups called naupliar eye. Phylogenetic data and morphological characteristics support the homology of naupliar eyes between ostracods and other crustacean groups. The photoreceptive system is formed by several specialised cells and can be approximated by a lens-mirror optical apparatus. In some cases, a transparent area of the calcitic carapace can form an additional lens. The visual stimuli are processed by the protocerebrum, possibly via monoaminergic neurons. The presence or absence of one or more specialised cells influence the function of the eyes, and, most likely, their evolution or loss are associated with the adaptation to different habitats. Podocopid ostracods may express long wavelength-sensitive rhabdomeric opsins and may possess nonvisual opsins. The few ethological experiments so far conducted demonstrate that non-marine ostracods might be capable of associative learning when trained with light or specific light wavelengths. This work will provide an overview of what is known and what remains to be further investigated about vision and how light cues affect the behaviour in non-marine ostracods.

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Structure and functional implications of photoreceptive systems in non-marine ostracods: a review

Bellavere,

Matzke-Karasz,

Romano

et al. 2024

Hydrobiologia

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A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes

Komeda,

Ohtsuka,

Huys

2024

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Both sexes of a new monotypic genus of Tisbidae (Copepoda, Harpacticoida) are described from the epi- or mesopelagic zone in the Kuroshio region, Japan. Gyorome guttatumgen. et sp. nov. belongs to a monophyletic lineage of deepwater holoplanktonic genera defined by a suite of characters. Within this clade, Gyoromegen. nov. appears most closely related to Neotisbella Boxshall, 1979. The most distinguishable feature of G. guttatumgen. et sp. nov. is the presence of large, paired, frontal modified eyes, each consisting of a baculiform ocellus, a globular (Gicklhorn’s?) organ, and a semi-parabolic plate. The taxonomic position of Tisbe spinulosa Bradford & Wells, 1983 is discussed and a key to the six meso- and bathypelagic tisbid species is provided. Confusion surrounding earlier literature reports of supernumerary elements on the caudal ramus in some harpacticoid taxa is clarified. Secondary modifications of ocellar components of the typical naupliar eye in the Harpacticoida are reviewed. It is suggested that the development of specialized eyes in G. guttatumgen. et sp. nov. may provide a means for detecting bioluminescent food particles in oligotrophic pelagic environments. The large, vaulted prosome indicates the species is an opportunistic macrophage that has adopted gorging as a feeding strategy.

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The Cornucopia of Copepod Eyes: The Evolution of Extreme Visual System Novelty

Cited by 2 publications

References 116 publications

Structure and functional implications of photoreceptive systems in non-marine ostracods: a review

Structure and functional implications of photoreceptive systems in non-marine ostracods: a review

A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes

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