Eocarcinus

Eocarcinus praecursor is a Jurassic species of decapod crustacean, sufficiently distinct from its relatives to be placed in its own family (Eocarcinidae).[1] Once considered the oldest true crab, it is now considered to be an early member of the Anomura.

Eocarcinus
Temporal range: Pliensbachian
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Order:
Decapoda
Infraorder:
Anomura
Superfamily:
Eocarcinoidea
Family:
Eocarcinidae

Withers, 1932
Genus:
Eocarcinus

Withers, 1932
Species:
E. praecursor
Binomial name
Eocarcinus praecursor
Withers, 1932

Distribution

It lived during the Pliensbachian age (Lower Jurassic),[2] and has been found in rocks at two sites in the United Kingdom – Mickelton Tunnel (near Aston Magna), Gloucestershire and Runswick Bay, Yorkshire.[3]

Description

In many of its characters, it represents a transitional stage between the Glypheoidea and the Middle Jurassic crabs in the Prosopidae.[2] Since its ancestors were long-tailed decapods, and its successors were short-tailed crabs, Eocarcinus has been described as "the lobster who decided to become a crab".[4] Previously considered to be the oldest known true crab, a 2010 revision concluded that Eocarcinus could not be accommodated among the Brachyura, and was instead transferred to the Anomura.[5]

gollark: Also something something directional antennas triangulation.
gollark: This is true, I read about use of coherent RTL-SDRs to something something multilateration.
gollark: Or, well, indistinguishable from uniform random data, not really indistinguishable from actual radio noise if you're transmitting it.
gollark: Encrypted data is indistinguishable from random noise, thus things.
gollark: https://github.com/seemoo-lab/mobisys2018_nexmon_covert_channel

References
  1. Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109. Archived from the original (PDF) on 2011-06-06.
  2. M. Krobicki; M. Zaton (2008). "Middle and Late Jurassic roots of brachyuran crabs: Palaeoenvironmental distribution during their early evolution". Palaeogeography, Palaeoclimatology, Palaeoecology. 263 (1–2): 30–43. doi:10.1016/j.palaeo.2008.01.025.
  3. Danièle Guinot; Marcos Tavares (2001). "Une nouvelle famille de Crabes du Crétacé, et la notion de Podotremata Guinot, 1977 (Crustacea, Decapoda, Brachyura)" (PDF). Zoosystema. 23 (3): 507–546.
  4. Anonymous (1932). "The Royal Society Conversazione". British Medical Journal. 1 (3724): 946–947. doi:10.1136/bmj.1.3724.944. JSTOR: 1st page, 2nd page
  5. Rodney M. Feldmann; Carrie E. Schweitzer (2010). "Is Eocarcinus Withers, 1932, a basal brachyuran?". Journal of Crustacean Biology. 30 (2): 241–250. doi:10.1651/09-3230.1.
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