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9 results for “lobopodians”
Fig. 4. Lobopodian Aysheaia pedunculata Walcott, 1911, USNM 365608 in Aysheaia prolata from the Utah Wheeler Formation (Drumian, Cambrian) is a frontal appendage of the radiodontan Stanleycaris
Fig. 4. Lobopodian Aysheaia pedunculata Walcott, 1911, USNM 365608 from the Stephen Formation (Cambrian Series 3, Stage 5), British Columbia, Canada; in cross-polarized light (A), cross-polarized light, red and yellow channels reduced (B).
Data from: The Collins' monster, a spinous suspension-feeding lobopodian from the Cambrian Burgess Shale of British Columbia
Lobopodians, a paraphyletic group of Palaeozoic vermiform animals bearing metameric appendages, are key to the origin of extant panarthropods. First discovered in 1983 on Mount Stephen (Yoho National Park, British Columbia), the Cambrian (Wuliuan) Burgess Shale lobopodian nicknamed "Collins' monster" is formally described as <i>Collinsovermis monstruosus</i> gen. et sp. nov. A formal systematic revision of the poorly known lobopodian <i>Acinocricus stichus</i> from Utah is also provided. The body of <i>Collinsovermis</i> is plump and compact, lacking space between lobopod pairs but shows the diagnostic suspension-feeding characters of luolishaniid lobopodians. The six anterior lobopod pairs are elongate, adorned with long and slightly curved ventral spinules arranged in a chevron-like pattern. The eight posterior lobopod pairs, which attach to a truncated body termination, are stout and smooth, each terminated by a single strong recurved claw. Each somite bears a pair of dorsal spines; somites 4 and posteriad bear an additional median spine. The spines on somites 1–3 are much shorter than the spines on the remaining somites. The head is short, bears a pair of antenniform outgrowths, and is covered by an oblong sclerite. <i>Collinsovermis</i> plus <i>Collinsium</i> and <i>Acinocricus</i> comprise a sub-group of stout luolishaniid lobopodians with remarkably long spinules on the front lobopods, interpreted here as a clade (Teratopodidae). This clade is distinct from both the comparatively slenderer <i>Luolishania</i> and a sub-group composed of <i>Facivermis</i> and <i>Ovatiovermis</i> with posterior lobopods reduced or absent. Luolishaniids were mostly sessile forerunners of arthropods that had coupled efficient suspension-feeding devices and, as in <i>Collinsovermis</i> defensive features.
Data from: The Collins’ monster, a spinous suspension-feeding lobopodian from the Cambrian Burgess Shale of British Columbia
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Data from: A three-dimensionally preserved lobopodian from the Herefordshire (Silurian) Lagerstätte, UK
The Herefordshire (Silurian) Lagerstätte (c. 430 MYr BP) has yielded, amongst many exceptionally preserved invertebrates, a wide range of new genera belonging to crown-group Panarthropoda. Here we increase this panarthropod diversity with the lobopodian Thanahita distos, a new total-group panarthropod genus and species. This new lobopodian preserves at least nine paired, long, slender appendages, the anterior two in the head region and the posterior seven representing trunk lobopods. The body ends in a short post-appendicular extension. Some of the trunk lobopods bear two claws, others a single claw. The body is covered by paired, tuft-like papillae. T. distos joins only seven other known three-dimensionally preserved lobopodian or onychophoran (velvet worm) fossil specimens and is the first lobopodian to be formally described from the Silurian. Phylogenetic analysis recovered it, together with all described Hallucigenia species, in a sister-clade to crown-group panarthropods. Its placement in a redefined Hallucigeniidae, an iconic Cambrian clade, indicates the survival of this clade to Silurian times.
Data from: Onychophoran-like musculature in a phosphatized Cambrian lobopodian
The restricted, exclusively terrestrial distribution of modern Onychophora contrasts strikingly with the rich diversity of onychophoran-like fossils preserved in marine Cambrian Lagerstätten. The transition from these early forebears to the modern onychophoran body plan is poorly constrained, in part due to the absence of fossils preserving details of the soft anatomy. Here we report muscle tissue in a new early Cambrian (Stage 3) lobopodian, Tritonychus phanerosarkus gen. et sp. nov., preserved in the Orsten fashion by three-dimensional replication in phosphate. This first report of Palaeozoic onychophoran musculature establishes peripheral musculature as a characteristic of the ancestral panarthropod, but documents an unexpected muscular configuration. Phylogenetic analysis reconstructs T. phanerosarkus as one of a few members of the main onychophoran lineage – which was as rare and as cryptic in the Cambrian period as it is today.
Data from: Onychophoran-like myoanatomy of the Cambrian gilled lobopodian Pambdelurion whittingtoni
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Data from: Onychophoran-like musculature in a phosphatized Cambrian lobopodian
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Data from: A three-dimensionally preserved lobopodian from the Herefordshire (Silurian) Lagerstätte, UK
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An armored, freshwater Lobopodian with chemical defenses from the Carboniferous
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