Archaeidae

Archaeidae, also known as assassin spiders and pelican spiders, is a spider family with about ninety described species in five genera.[1] It contains small spiders, ranging from 2 to 8 millimetres (0.079 to 0.315 in) long, that prey exclusively on other spiders.[2] They are unusual in that they have "necks", ranging from long and slender to short and fat. The name "pelican spider" refers to these elongated jaws and necks used to catch their prey. Living species of Archaeidae occur in South Africa, Madagascar and Australia, with the sister family Mecysmaucheniidae occurring in southern South America and New Zealand.[1]

Assassin spiders
Temporal range: Middle Jurassic–Recent
Austrarchaea sp.
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Superfamily: Palpimanoidea
Family: Archaeidae
C. L. Koch & Berendt, 1854
Diversity
5 genera, 90 species

Assassin spiders were first known from 40 million year old amber fossils which were found in Europe in the 1840s, and were not known to have living varieties until 1881, when the first living assassin spider was found in Madagascar.[3]

The fossil record of this family was first identified from Baltic amber dating to the Eocene, although many taxa from these deposits have been reassigned to Mecysmaucheniidae, Malkaridae, and Anapidae. Currently valid Baltic species include Archaea levigata and Archaea paradoxa. In 2003, Afarchaea grimaldii was described from Cretaceous Burmese amber aged between 88-95 million years, extending the record of this group considerably, the oldest fossil known of the group is Patarchaea muralis from the Middle Jurassic (Oxfordian/Callovian) of Inner Mongolia, China.[4]

Taxonomy

The family Archaeidae was erected in 1854 by C. L. Koch and Berendt[1] for one genus, Archaea, initially with three extinct species,[3] all found in amber from the Baltic Sea or Bitterfeld in Saxony-Anhalt, Germany. No living species are placed in this genus.

Extant genera

As of April 2019, the World Spider Catalog accepts the following genera:[1]

Fossils

Fossils found in amber, particularly from the Baltic and Myanmar (Burma), have been assigned to a number of extant and extinct genera placed in the family Archaeidae.[5] The extinct species Burmesarchaea grimaldii (syn. Afrarchaea grimaldii) was found in Burmese amber dated to 88–95 Mya.[6] Jurarchaea zherikhini Eskov, 1987 was previously considered a member of this family, but it is more likely a holarchaeid or a pararchaeid.

  • †Archaea Koch and Berendt 1854 Baltic, Bitterfeld amber, Eocene
  • †Archaemecys Saupe and Selden 2009 Charentese amber, France, Cenomanian
  • †Baltarchaea Eskov 1992 Baltic amber, Eocene
  • †Burmesarchaea Wunderlich 2008 Burmese amber, Myanmar, Cenomanian
  • †Eoarchaea Forster and Platnick 1984 Baltic, Bitterfeld amber, Eocene
  • †Eomysmauchenius Wunderlich 2008 Burmese amber, Myanmar, Cenomanian
  • †Lacunauchenius Wunderlich 2008 Burmese amber, Myanmar, Cenomanian
  • †Myrmecarchaea Wunderlich 2004 Baltic amber, Eocene
  • †Patarchaea Selden et al. 2008 Daohugou, China, Callovian
  • †Planarchaea Wunderlich 2015 Burmese amber, Myanmar, Cenomanian
  • †Saxonarchaea Wunderlich 2004 Baltic, Bitterfeld amber, Eocene

Phylogeny

A 2012 Bayesian phylogenetic analysis of 15 Archaeidae species, using combined molecular and morphological data, produced the cladogram shown below. Species representing modern genera found in Africa and Madagascar (Afrarchaea and Eriauchenius) were not resolved into monophyletic groups; Zephyrarchaea had not then been split off from Austrarchaea. The species found in European amber formed a clade, whereas Burmesarchaea grimaldii, from Burmese amber, appeared to be basal to modern genera.[7]

Archaeidae
 
 
 

Austrarchaea (including Zephyrarchaea)

 
 

Afrarchaea + Eriauchenius

 
 
 

†Burmesarchaea grimaldii

 
 
 
 

†Archaea paradoxa

 
 
 

†Baltarchaea conica

 
 
 

†Myrmecarchaea sp.

 
 

†Patarchaea muralis

 
 
 
 
 

See also

References
  1. "Family: Archaeidae C. L. Koch & Berendt, 1854". World Spider Catalog. Natural History Museum Bern. Retrieved 2019-04-19.
  2. Wood HM, Scharff N (2018). "A review of the Madagascan pelican spiders of the genera Eriauchenius O.". ZooKeys.
  3. Koch, C.L. & Berendt, G.C. (1854). Die im Bernstein befindlichen Crustaceen, Myriapoden, Arachniden und Apteren der Vorwelt [The organic remains of antiquity found in amber] (in German). Berlin.
  4. Selden, Paul A.; Diying, Huang; Dong, Ren (2008). "Palpimanoid spiders from the Jurassic of China". Journal of Arachnology. 36 (2): 306–321. doi:10.1636/CA07-106.1. ISSN 0161-8202. S2CID 73616235.
  5. Dunlop, J.A.; Penney, D. & Jekel, D. (2016), "A summary list of fossil spiders and their relatives, version 17.5" (PDF), World Spider Catalog, Natural History Museum Bern, retrieved 2016-10-13
  6. Penney, D. (2003), "Afrarchaea grimaldii, a new species of Archaeidae (Araneae) in Cretaceous Burmese amber" (PDF), Journal of Arachnology, 31: 122–130, doi:10.1636/0161-8202(2003)031[0122:aganso]2.0.co;2, retrieved 2016-10-13
  7. Wood, Hannah Marie; Griswold, Charles E. & Gillespie, Rosemary G. (2012). "Phylogenetic placement of pelican spiders (Archaeidae, Araneae), with insight into evolution of the "neck" and predatory behaviours of the superfamily Palpimanoidea". Cladistics. 28 (6): 598–626. doi:10.1111/j.1096-0031.2012.00411.x. S2CID 56331535.
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