Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Chelicerata
Classis: Arachnida
Ordo: Araneae
Subordo: Opisthothelae
Infraordo: Araneomorphae
Taxon: Neocribellatae
Series: Entelegynae
Superfamilia: Palpimanoidea
Familiae (6): Huttoniidae – Palpimanidae – Stenochilidae – †Lagonomegopidae – †Micropalpimanidae – †Spatiatoridae
Name
Palpimanoidea Forster & Platnick, 1984
References
Primary references
Forster, R.R. & Platnick, N.I. 1984. A review of the archaeid spiders and their relatives, with notes on the limits of the superfamily Palpimanoidea (Arachnida, Araneae). Bulletin of the American Museum of Natural History 178: 1–106. Abstract & PDF.
Vernacular names
中文: 二纺蛛总科
The Palpimanoidea or palpimanoids, also known as assassin spiders,[1] are a group of araneomorph spiders, originally treated as a superfamily. As with many such groups, its circumscription has varied. As of September 2018, the following five families were included:[2][3]
Archaeidae
Huttoniidae
Mecysmaucheniidae
Palpimanidae
Stenochilidae
Many palpimanoids specialize in preying on other spiders, hence the name "assassin spiders". They have various adaptations for catching prey, including enlarged spade-like front legs, and heads raised up on a "neck" with long chelicerae ("jaws"). Fossils suggest that the group was once widespread, but most species are now found in the Southern Hemisphere. Morphological studies support the monophyly of the group, although molecular studies have produced different results.
Description
Many palpimanoids, particularly members of the families Archaeidae, Huttoniidae and Stenochilidae, specialize in preying on other spiders, hence the description "assassin spiders". They enter the retreats and webs of other spiders and seize them. Members of the families Huttoniidae, Palpimanidae and Stenochilidae have extensive scopulae on the sides of their often enlarged front legs, which enable them to both seize and manipulate prey. Members of the family Archaeidae have much smaller scopulae, but have a highly modified prosoma (cephalothorax), in which a long narrow "neck" separates a "head" portion from the rest of the prosoma. The long neck is matched by long chelicerae. Members of the Mecysmaucheniidae also have an elongated prosoma and chelicerae, although less so than archaeids. When hunting prey, mecysmaucheniids hold their chelicerae widely open. Long, forward directed hairs (setae) appear to act as triggers; when these are touched by prey, the chelicerae rapidly snap shut, enabling mecysmaucheniids to catch fast-moving prey, such as springtails.[1][2]
Zephyrarchaea grayi (Archaeidae), showing the "neck" and long chelicerae (bar = 1 mm) Zephyrarchaea grayi (Archaeidae), showing the "neck" and long chelicerae (bar = 1 mm)
Zearchaea clypeata (Mecysmaucheniidae), showing the less long "neck" and chelicerae
Boagrius sp. (Palpimanidae), showing the enlarged front legs (bar = 1 mm)
Phylogeny
In 1984, Raymond R. Forster and Norman I. Platnick proposed that some groups previously considered araneoid actually belonged in the distantly related Palpimanoidea, including the then families Holarchaeidae, Micropholcommatidae, Mimetidae and Pararchaeidae. Subsequent phylogenetic studies have rejected this proposal, firmly placing them in Araneoidea.[3]
Studies published in 2012 and 2013, using morphological, molecular and fossil evidence, agreed that Palpimanoidea is monophyletic.[2][4] Molecular data suggested the following relationship between the five families comprising the Palpimanoidea, although three of the families were represented by only one species each:[2]
| Palpimanoidea |
|
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Using only morphological data produced a different arrangement of the families:[2]
| Palpimanoidea |
|
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A large molecular phylogenetic study, first published online in 2016, grouped the five families in the same way, but suggested that the Palpimanoidea, together with part of the non-monophyletic Leptonetidae, were a paraphyletic group basal to the large Entelegynae clade:[1]
|
Palpimanoidea
|
Nevertheless, the authors preferred to accept the earlier conclusion based on multiple lines of evidence that the Palpimanoidea are a monophyletic group.[1]
Although the morphological data suggests that the two families with "necks" in the prosoma, Archaeidae and Mecysmaucheniidae, are sisters, molecular data suggests otherwise. It is now believed that the elongated and elevated "neck" has evolved independently in these two families, as well as in the more distantly related Malkaridae (Pararchaeidae).[2]
Distribution
The Palpimanoidea are mainly found in the Southern Hemisphere. Archaeidae, Huttoniidae and Mecysmaucheniidae have a Gondwanan distribution, with species native to South America, South Africa, Madagascar, Australia and New Zealand.[5][6][7] The Stenochilidae are found in South-east Asia.[8] Only the Palpimanidae cross into the Northern Hemisphere, with a few species reaching Central Asia and China.[9] Palpimanoids were once more widely distributed; thus 12 fossil genera of Archaeidae have been found in the Northern Hemisphere.[1]
References
Wheeler, Ward C.; Coddington, Jonathan A.; Crowley, Louise M.; Dimitrov, Dimitar; Goloboff, Pablo A.; Griswold, Charles E.; Hormiga, Gustavo; Prendini, Lorenzo; Ramírez, Martín J.; Sierwald, Petra; Almeida-Silva, Lina; Alvarez-Padilla, Fernando; Arnedo, Miquel A.; Benavides Silva, Ligia R.; Benjamin, Suresh P.; Bond, Jason E.; Grismado, Cristian J.; Hasan, Emile; Hedin, Marshal; Izquierdo, Matías A.; Labarque, Facundo M.; Ledford, Joel; Lopardo, Lara; Maddison, Wayne P.; Miller, Jeremy A.; Piacentini, Luis N.; Platnick, Norman I.; Polotow, Daniele; Silva-Dávila, Diana; Scharff, Nikolaj; Szűts, Tamás; Ubick, Darrell; Vink, Cor J.; Wood, Hannah M. & Zhang, Junxia (2017) [published online 2016], "The spider tree of life: phylogeny of Araneae based on target-gene analyses from an extensive taxon sampling", Cladistics, 33 (6): 574–616, doi:10.1111/cla.12182, PMID 34724759
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, PMID 34856731, S2CID 56331535
Hormiga, Gustavo & Griswold, Charles E. (2014), "Systematics, Phylogeny, and Evolution of Orb-Weaving Spiders", Annual Review of Entomology, 59 (1): 487–512, doi:10.1146/annurev-ento-011613-162046, PMID 24160416
Wood, Hannah Marie; Matzke, Nicholas J.; Gillespie, Rosemary G. & Griswold, Charles E. (2013), "Treating Fossils as Terminal Taxa in Divergence Time Estimation Reveals Ancient Vicariance Patterns in the Palpimanoid Spiders", Systematic Biology, 62 (2): 264–284, doi:10.1093/sysbio/sys092, PMID 23192838
"Family Archaeidae C. L. Koch & Berendt, 1854", World Spider Catalog, Natural History Museum Bern, retrieved 2018-09-09
"Family Huttoniidae Simon, 1893", World Spider Catalog, Natural History Museum Bern, retrieved 2018-09-09
"Family Mecysmaucheniidae Simon, 1895", World Spider Catalog, Natural History Museum Bern, retrieved 2018-09-09
"Family Stenochilidae Thorell, 1873", World Spider Catalog, Natural History Museum Bern, retrieved 2018-09-09
"Family Palpimanidae Thorell, 1870", World Spider Catalog, Natural History Museum Bern, retrieved 2018-09-09
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