Parastylonuridae

The Parastylonuridae are a family of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions". The family is one of two families contained in the superfamily Stylonuroidea (along with Stylonuridae), which in turn is one of four superfamilies classified as part of the suborder Stylonurina.

Parastylonuridae
Temporal range: Silurian–Devonian
Stylonurella
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Order: †Eurypterida
Superfamily: †Stylonuroidea
Family: †Parastylonuridae
Waterston, 1979
Genera

Description

Parastylonurids are stylonuroids with a posterior second order opisthosomal differentiation and with spiniferous appendages II-IV akin to the genus Hughmilleria and non-spiniferous appendages V-VI akin to the genus Parastylonurus or Pagea.[1]

Unlike the close relatives in the Stylonuridae, there are no adaptations towards sweep-feeding within the Parastylonuridae. They retain primitive Hughmilleria-like prosomal appendages II-IV unsuited for such a lifestyle, and they were likely scavengers instead of sweep-feeders.[1]

Systematics and genera

The Stylonuridae is classified within the superfamily Stylonuroidea within the Stylonurina. It is worth noting that the family Parastylonuridae as defined by Lamsdell et al. (2010)[1] is paraphyletic, and knowingly made so, but was retained as it is due to the lack of complete material of either genus included within it, Parastylonurus and Stylonurella.

Family Parastylonuridae Waterston, 1979

gollark: So 60 rows and 4 columns, or...?
gollark: I can... do some CSS/HTML, sure.
gollark: <@301477111229841410> I have a webserver which does other things, and the memory usage is very very low. So is CPU. I don't get much traffic.
gollark: Browser extensions are generally autoupdated, so they probably *could* release a malicious version which steals them and get a bunch before anyone notices.
gollark: I would be surprised if it could actually run an entirely different language to the one it's designed for. Technically you could maybe run a Python interpreter written in JS, but that would be difficult and hilariously inefficient.

References
  1. James C. Lamsdell, Simon J. Braddy & O. Erik Tetlie (2010). "The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida)". Journal of Systematic Palaeontology. 8 (1): 49–61. doi:10.1080/14772011003603564.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.