Aulacopleura

Aulacopleura is a genus of proetid trilobite[1] that lived from the Middle Ordovician to the Middle Devonian. Some authors may classify this group as subgenus Otarion (Aulacopleura).[2] The cephalon is semicircular or semielliptical, with border and preglabellar field. The glabella is short, with or without defined eye ridges connecting it with eyes of variable size. Spines at the rear outer corners of the cephalon (or genal spines) are present, typically reaching back to the 2nd to 4th thorax segment. The 'palate' (or hypostome) is not connected to the dorsal shield of the cephalon (or natant). The cephalon is pitted, or has small tubercles. The thorax has up to 22 segments. The pleural ends are usually rounded. The pygidium is small (micropygous), with an even margin. A. koninckii had a modern type of compound eye.[3]

Aulacopleura
Aulacopleura koninckii, Kosovu Beruna, Czech Republic
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Proetida
Family: †Aulacopleuridae
Genus: †Aulacopleura
Hawle & Corda, 1847
Type species
†Aulacopleura koninckii
Barrande, 1846
Species
  • A. koninckii (Barrande, 1846)
  • A. andersoni Adrian & Chatterton, 1995
  • A. krizi Šnajdr, 1975
  • A. letmathensis Basse & Lemke, 1996
  • A. pogsoni Edgecombe & Sherwin, 2001
  • A. sandfordi Edgecombe & Sherwin, 2001
  • A. wulongensis Wang, 1989
Synonyms

Arethusa Barrande, 1846 non De Montfort, 1808, Arethusina Barrande, 1852

Taxonomy

Barrande described Arethusa koninckii in 1846. However, Arethusa was occupied since it was used by De Montfort in 1808 for a foram protist. Barrande tried to correct this by proposing Arethusina as a replacement, but by that time that Hawle and Corda had already suggested Aulacopleura in 1847, which is thus the senior available name.[4][5]

Distribution
  • A. koninckii (A. konincki seems to be misspelled)[8][9][10] is known from the Middle Silurian of the Czech Republic (Wenlockian, Liten Formation, Bohemia).[8]
  • A. letmathensis has been found in the Middle Devonian of Germany (Givetian).
  • A. pogsoni was collected from Lower Silurian of Australia (late Llandovery, upper Cotton Formation, near Forbes, New South Wales).[7]
  • A. sandfordi Edgecombe & Sherwin, 2001 - Lower Silurian Australia (Llandover, Upper Cotton Formation, near Forbes, New South Wales)[7]
  • A. wulongensis occurs in the Lower Silurian of China (Llandovery, Sichuan).)[8]

See also

References
  1. Sam M. Gon III. "Trilobite info". www.trilobites.info.
  2. Fossilworks: †Aulacopleura Hawle and Corda 1847 (trilobite)
  3. B. Choenemann & E.N.K. Clarkson. 2020. Insights into a 429-million-year-old compound eye. Sci Rep 10, 12029; doi: 10.1038/s41598-020-69219-0
  4. Moore, Raymond C., ed. (1959). Treatise on Invertebrate Paleontology [Part O - Arthropoda 1 (Arthropoda General Features, Protarthropoda, Euarthropoda General Features, Trilobitomorpha)]. Geological Society of America and University of Kansas Press.
  5. B. W. Hayward: Arethusa Montfort, 1808 †, on: World Foraminifera Database, marinespecies.org, Flanders Marine Institute
  6. Llandover Woods Greenspace
  7. Edgecombe, G.D.; Sherwin, L. (2001). "Early Silurian (Llandovery) trilobites from the Cotton Formation, near Forbes, New South Wales, Australia". Alcheringa: An Australasian Journal of Palaeontology. 25 (1): 87–105). doi:10.1080/03115510108619215. S2CID 128404133.
  8. Paul S. Hong, Nigel C. Hughes, H. David Sheets. Size, shape, and systematics of the Silurian trilobite Aulacopleura koninckii. In: Journal of Paleontology Vol. 88, issue 6. Nov 2014. PP 1120–1138. ISSN 1937-2337 0022-3360, 1937-2337. Epub 14 July 2014. doi:10.1666/13-142
  9. Brigitte Schoenemann, Euan N. K. Clarkson: Insights into a 429-million-year-old compound eye, in: nature, Scientific Reports 10, Article number: 12029 (2020), doi:10.1038/s41598-020-69219-0.
    Michael Marshall: Trilobites living 429 million years ago had eyes like modern insects, on: NewScientist, 13 August 2020
  10. Giuseppe Fusco, Paul S. Hong, Nigel C. Hughes: Axial growth gradients across the postprotaspid ontogeny of the Silurian trilobite Aulacopleura koninckii. In: Paleobiology. Cambridge University Press, Volume 42, Issue 3, August 2016, pp. 426-438, doi:10.1017/pab.2016.5
    Natali Anderson: Silurian Trilobite Had Modern Type of Compound Eye, on: sci-news, 17 August 2020
  11. Šnajdr, Milan. New Trilobita from the Llandovery at Hýskov in the Beroun area, Central Bohemia (Czech). In: Vestník Ústredního Ústavu geologického 50(5). Praha, 1975. PP. 311-316. Pascal Francis (cnrs)
  12. BioLib: Aulacopleura krizi Šnajdr, 1975†

Sources
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