The mouthparts of Scutigerella immaculata: Correspondences and variation among serially homologous head appendages

Szucsich, Nikolaus U.; Pennerstorfer, Markus; Wirkner, Christian S.

doi:10.1016/j.asd.2010.10.002

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…The hexapod mandible is an unsegmented appendage in both the larva and the adult, however, recent morphological studies have suggested the presence of both a subcoxa and coxa in the developing mandible, and that this may be a general character of Hexapoda 9 11 21 22 23 as well as in Myriapoda 24 . The Tribolium mandible limb bud shows two domains of Tc-ser expression - a ring and spot domain (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Molecular developmental evidence for a subcoxal origin of pleurites in insects and identity of the subcoxa in the gnathal appendages

Coulcher

Edgecombe

Telford³

2015

Sci Rep

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Pleurites are chitinous plates in the body wall of insects and myriapods. They are believed to be an adaptation to locomotion on land but their developmental and evolutionary origins are unclear. A widely endorsed explanation for their origin is through toughening pre-existing parts of the body wall; in contrast, the subcoxal theory suggests pleurites derive from a redeployment of the proximal-most section of the leg, the subcoxa. Here, by studying expression of appendage patterning genes in embryos and larvae of the beetle Tribolium castaneum, we provide the first molecular evidence for the existence of a cryptic subcoxal segment in developing legs. We follow this structure during development and show that the embryonic subcoxa later forms the pleurites of the larva as predicted by the subcoxal theory. Our data also demonstrate that subcoxal segments are present in all post-antennal appendages, including the first molecular evidence of a two-segmented mandible with a subcoxal segment in insects.

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Section: Resultsmentioning

confidence: 99%

Molecular developmental evidence for a subcoxal origin of pleurites in insects and identity of the subcoxa in the gnathal appendages

Coulcher

Edgecombe

Telford³

2015

Sci Rep

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“…Fixation of freshly collected specimens is required for subcellular histological observations, but semi-thin sections of alcohol-preserved specimens can provide important and useful information about the gross morphology of arthropods. Great examples of histological sectioning in the context of arthropod systematics include Wirkner and Richter (2007), Edgecombe and Koch (2008), Beutel et al (2009aBeutel et al ( , 2009bBeutel et al ( , 2010, Friedrich and Beutel (2010), Camacho (2011), Szucsich et al (2011) and Koch and Edgecombe (2012).…”

Section: Introductionmentioning

confidence: 99%

Evolutionary phenomics and the emerging enlightenment of arthropod systematics

Deans

István

Wipfler‍

et al. 2012

Invert. Systematics

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Abstract. Published research on the diversity and evolutionary history of Arthropoda sets a high standard for data collection and the integration of novel methods. New phylogenetic estimation algorithms, divergence time approaches, collaborative tools and publishing standards, to name a few, were brought to the broader scientific audience in the context of arthropod systematics. The treatment of morphology in these studies, however, has largely escaped innovation. Lodes rich in characters too often go unexplored, phenotype concepts are published with inadequate documentation and the way observations are textualised leaves them inaccessible to a majority of biologists. We discuss these issues, using data from recent arthropod systematics publications, and offer several that stand to restore the broad utility of morphological data. Specifically, we focus on: (1) the potential of internal soft-part characters and how to integrate their observation into arthropod systematics projects through dissection and serial sectioning; (2) the importance of capturing observations in images, especially using relatively new approaches, like laser scanning confocal microscopy and three-dimensional reconstruction; and (3) the untapped potential of established knowledge representation methods, which may help make the descriptive components of arthropod systematics research more accessible to other domains.

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