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| Format: | Recurso digital |
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Zenodo
2023
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| Online Access: | https://doi.org/10.5281/zenodo.8421986 |
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Table of Contents:
- <p><b>Genus <i>Paraclausocaris</i> gen. nov.</b></p><p>urn:lsid:zoobank.org:act: BE0312F9-B192-4581-A2CB-3CC408857206</p><p><b>Type species</b></p><p><i>Paraclausocaris harpa</i> gen. et sp. nov. by monotypy.</p><p><b>Diagnosis</b></p><p>Thylacocephala with a well-developed optic notch restricted to the ventral margin, a sharp antero-ventral angle, small sinuous ridges on the shield and raptorial appendages 3 having spines on the second and third podomeres of the distal part.</p><p><b>Etymology</b></p><p>From the Latin ‘ <i>par</i>, <i>paris</i> ’ (‘close to’) and <i>Clausocaris</i> Polz, 1989.</p><p><b>Remarks</b></p><p><i>Paraclausocaris</i> gen. nov. has many similarities with <i>Clausocaris</i>: a cone-shaped shield in lateral view, a dorsal midline with sharp, short serrations and long, thin raptorial appendages relative to the shield. However, it also displays some differences, including a well-developed posterior margin and an anterior margin with an optic notch limited to the ventral part of the margin for <i>Paraclausocaris</i>, while in <i>Clausocaris</i> the posterior margin is absent and the optic notch occupies the whole margin. As a result of these differences, we erect <i>Paraclausocaris</i>.</p><p>One last morphological trait should also be discussed here: the number of posterior trunk appendages. In <i>Paraclausocaris</i> gen. nov., we recognize nine pairs of posterior trunk appendages. Arduini (1992) described eight posterior trunk appendages in <i>Clausocaris pinnai</i>, but based on pictures from Dalla Vecchia (2012), there may actually be nine as in <i>Paraclausocaris</i>. However, it is different from the number reported by Polz (1990) or Haug <i>et al.</i> (2014) for <i>Clausocaris lithographica</i>. They respectively reported 10 or 11 posterior trunk appendages for this species. Interspecific variation in the number of posterior trunk appendages is not uncommon among Thylacocephala (Schram 2014). However, it is quite unusual to find such variation among closely related forms: for instance, eight posterior trunk appendages are usually reported in <i>Concavicaris</i> species (Schram 2014). Thus, it will be necessary to revise <i>C. pinnai</i> to confirm its assignment to <i>Clausocaris</i>.</p>