Henningsmoenicaris

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Henningsmoenicaris
Temporal range: Upper Cambrian
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Superphylum: Ecdysozoa
Clade: Panarthropoda
Phylum: Arthropoda
Genus:† Henningsmoenicaris
Müller and Waloszek, 1990 [1]
Species:
†H. scutula
Binomial name
†Henningsmoenicaris scutula
(Müller & Waloszek, 1990)

Henningsmoenicaris is an extinct genus of Cambrian arthropods from the Orsten of Sweden. [2] It was formerly named Henningsmoenia, however this name was preoccupied by an ostracod, therefore it was renamed. [1] Its genus name translates to "Henningsmoen's shrimp" after G. Henningsmoen. The genus contains a single species, Henningsmoenicaris scutula, with the specific name, scutula referencing the large, bowl-shaped carapace. [2]

Morphology

Henningsmoenicaris unusually had an almost 360° field of vision, with two extremely long stalked eyes facing in almost all directions at once, even inwards to give depth perception to the opposite eye. [3] Aside from this, it is a relatively "ordinary" Orsten arthropod with a large bowl-shaped head shield, five pairs of differentiated head appendages including antennules used for swimming, a three-segmented thorax with a pair of appendages on each segment (alongside a ninth pair seemingly still developing in the most developed complete specimen), a five-spined tail segment and a hypostome on the head. The most developed complete fossil is roughly 550 micrometers long, however a trunk fragment of a much larger and more developed specimen suggests even this form is a larva. [2] [4]

References

  1. 1 2 Walossek, D.; Müller, K. J. (April 1991). "Henningsmoenicaris n. gen. for Henningsmoenia Walossek & Müller, 1990 - correction of a name". Lethaia. 24 (2): 138. Bibcode:1991Letha..24..138W. doi:10.1111/j.1502-3931.1991.tb01461.x.
  2. 1 2 3 Walossek, Dieter; Müller, Klaus J. (October 1990). "Upper Cambrian stem-lineage crustaceans and their bearing upon the monophyletic origin of Crustacea and the position of Agnostus". Lethaia. 23 (4): 409–427. Bibcode:1990Letha..23..409W. doi:10.1111/j.1502-3931.1990.tb01373.x.
  3. ↑ Schoenemann, Brigitte; Castellani, Christopher; Clarkson, Euan N. K.; Haug, Joachim T.; Maas, Andreas; Haug, Carolin; Waloszek, Dieter (7 April 2012). "The sophisticated visual system of a tiny Cambrian crustacean: analysis of a stalked fossil compound eye". Proceedings of the Royal Society B: Biological Sciences. 279 (1732): 1335–1340. doi:10.1098/rspb.2011.1888. PMC   3282376 . PMID   22048954.
  4. ↑ Haug, Joachim T.; Maas, Andreas; Waloszek, Dieter (September 2009). "† Henningsmoenicaris scutula, † Sandtorpia vestrogothiensis gen. et sp. nov. and heterochronic events in early crustacean evolution". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 100 (3): 311–350. Bibcode:2009EESTR.100..311H. doi:10.1017/S1755691010008145.


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