Universität zu Köln

Schoenemann, Brigitte, Poschmann, Markus ORCID: 0000-0001-9710-1673 and Clarkson, Euan N. K. (2019). Insights into the 400 million-year-old eyes of giant sea scorpions (Eurypterida) suggest the structure of Palaeozoic compound eyes. Sci Rep, 9. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

Sea scorpions (Eurypterida, Chelicerata) of the Lower Devonian (similar to 400 Mya) lived as large, aquatic predators. The structure of modern chelicerate eyes is very different from that of mandibulate compound eyes [Mandibulata: Crustacea and Tracheata (Hexapoda, such as insects, and Myriapoda)]. Here we show that the visual system of Lower Devonian (similar to 400 Mya) eurypterids closely matches that of xiphosurans (Xiphosura, Chelicerata). Modern representatives of this group, the horseshoe crabs (Limulidae), have cuticular lens cylinders and usually also an eccentric cell in their sensory apparatus. This strongly suggests that the xiphosuran/eurypterid compound eye is a plesiomorphic structure with respect to the Chelicerata, and probably ancestral to that of Euchelicerata, including Eurypterida, Arachnida and Xiphosura. This is supported by the fact that some Palaeozoic scorpions also possessed compound eyes similar to those of eurypterids. Accordingly, edge enhancement (lateral inhibition), organised by the eccentric cell, most useful in scattered light-conditions, may be a very old mechanism, while the single-lens system of arachnids is possibly an adaptation to a terrestrial life-style.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schoenemann, Brigitte UNSPECIFIED UNSPECIFIED UNSPECIFIED Poschmann, Markus UNSPECIFIED orcid.org/0000-0001-9710-1673 UNSPECIFIED Clarkson, Euan N. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-126947
DOI:	10.1038/s41598-019-53590-8
Journal or Publication Title:	Sci Rep
Volume:	9
Date:	2019
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LATERAL EYE; VISUAL-SYSTEMS; LIMULUS; EVOLUTION; MORPHOLOGY; CHELICERATA; PHYLOGENY; PATTERNS; TERRESTRIALIZATION; ARACHNIDA Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12694