Fine structural description of the lateral ocellus of Craterostigmus tasmanianus Pocock, 1902 (Chilopoda: Craterostigmomorpha) and phylogenetic considerations

Journal of Morphology
Carsten H G Müller, V Benno Meyer-Rochow

Abstract

The lateral lens eye of adult Craterostigmus tasmanianus Pocock, 1902 (a centipede from Australia and New Zealand) was examined by light and electron microscopy. An elliptical, bipartite eye is located frontolaterally on either side of the head. The nearly circular posterior part of the eye is characterized by a plano-convex cornea, whereas no corneal elevation is visible in the crescentic anterior part. The so-called lateral ocellus appears cup-shaped in longitudinal section and includes a flattened corneal lens comprising a homogeneous and pigmentless epithelium of cornea-secreting cells. The retinula consists of two kinds of photoreceptive cells. The distribution of the distal retinula cells is highly irregular. Variable numbers of cells are grouped together in multilayered, thread-like unions extending from the ventral and dorsal margins into the center of the eye. Around their knob-like or bilobed apices the distal retinula cells give rise to fused polymorphic rhabdomeres. Both everse and inverse cells occur in the distal retinula. Smaller, club-shaped proximal retinula cells are present in the second (limited to the peripheral region) and proximal third of the eye, where they are arranged in dual cell units. In its apical...Continue Reading

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Citations

Nov 11, 2010·Frontiers in Zoology·Stefan RichterSteffen Harzsch
Dec 1, 2009·Arthropod Structure & Development·William A Shear, Gregory D Edgecombe
Dec 20, 2007·Arthropod Structure & Development·Dan-E Nilsson, Almut Kelber
Dec 20, 2007·Arthropod Structure & Development·Steffen Harzsch, Roland Melzer
Dec 20, 2007·Arthropod Structure & Development·Steffen Harzsch, Gary Hafner
Jul 29, 2006·Annual Review of Entomology·Gregory D Edgecombe, Gonzalo Giribet
Aug 16, 2015·Arthropod Structure & Development·Nicholas J StrausfeldXianguang Hou
Nov 24, 2007·Seminars in Cell & Developmental Biology·Kristyna Jonasova, Zbynek Kozmik
Jul 6, 2010·Molecular Phylogenetics and Evolution·Jerome MurienneGonzalo Giribet

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