Lobopodians
نویسنده
چکیده
. Figure 1. Cambrian lobopodian diversity. (A) Aysheaia pedunculata, middle Cambrian Burgess Shale (NMNH-83942). (B) Claws of Aysheaia pedunculata (NMNH-365608). (C) Hallucigenia sparsa, middle Cambrian Burgess Shale (NMNH198658; courtesy of M. Smith, University of Cambridge. Nature 523, 75–78). (D) Microdictyon sinicum, early Cambrian Chengjiang (ELRC-30060; courtesy of G. Edgecombe, Natural History Museum London. Evolution: Education and Outreach 2, 178-190). (E) Acinocricus stichus, middle Cambrian Spence Shale (KUMIP-204353). (F) Diania cactiformis, early Cambrian Chengjiang (YKLP-11314; courtesy of X. Ma, Natural History Museum London. Journal of Systematic Palaeontology 12, 445–457). Scale bars: A (3 mm), B (0.2 mm), C, D, F (5 mm), E (2 mm). Orientation: anterior facing left (A, C, D), top (E), right (B, F) Lobopodians
منابع مشابه
Cambrian lobopodians and extant onychophorans provide new insights into early cephalization in Panarthropoda
Cambrian lobopodians are important for understanding the evolution of arthropods, but despite their soft-bodied preservation, the organization of the cephalic region remains obscure. Here we describe new material of the early Cambrian lobopodian Onychodictyon ferox from southern China, which reveals hitherto unknown head structures. These include a proboscis with a terminal mouth, an anterior a...
متن کاملHomology of Head Sclerites in Burgess Shale Euarthropods
The Cambrian fossil record of euarthropods (extant arachnids, myriapods, crustaceans, hexapods) has played a major role in understanding the origins of these successful animals and indicates that early ancestors underwent an evolutionary transition from soft-bodied taxa (lobopodians) to more familiar sclerotized forms with jointed appendages [1-3]. Recent advances in paleoneurology and developm...
متن کاملBeyond the Burgess Shale: Cambrian microfossils track the rise and fall of hallucigeniid lobopodians.
Burgess Shale-type deposits are renowned for their exquisite preservation of soft-bodied organisms, representing a range of animal body plans that evolved during the Cambrian 'explosion'. However, the rarity of these fossil deposits makes it difficult to reconstruct the broader-scale distributions of their constituent organisms. By contrast, microscopic skeletal elements represent an extensive ...
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Lobopodians, a nonmonophyletic assemblage of worm-shaped soft-bodied animals most closely related to arthropods, show two major morphotypes: long-legged and short-legged forms. The morphotype with stubby, conical legs has a long evolutionary history, from the early Cambrian through the Carboniferous, including the living onychophorans and tardigrades. Species with tubular lobopods exceeding the...
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Background: Onychophora (velvet worms) represent the most basal arthropod group and play a pivotal role in the current discussion on the evolution of nervous systems and segmentation in arthropods. Although there is a wealth of information on the immunolocalization of serotonin (5hydroxytryptamine, 5-HT) in various euarthropods, as yet no comparable localization data are available for Onychopho...
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ورودعنوان ژورنال:
- Current Biology
دوره 25 شماره
صفحات -
تاریخ انتشار 2015