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Planaterga was named by Lamsdell (2013). It is extant.

It was assigned to Prosomapoda by Lamsdell (2013) and Dunlop et al. (2020).

Synonymy list
YearName and author
2013Planaterga Lamsdell p. 19
2020Planaterga Dunlop et al.

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
subphylumChelicerataHeymons 1901
EuchelicerataWeygoldt and Paulus 1979

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Unr. Planaterga Lamsdell 2013
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G. †Bembicosoma Laurie 1899
Bembicosoma pomphicus Laurie 1899
G. †Bunaia Clarke 1919
G. †Bunodes Eichwald 1859
Bunodes lunula Eichwald 1854
Invalid names: Bunodes rugosus Eichwald 1854 [synonym], Exapinurus schrenki Nieszkowski 1859 [synonym]
Invalid names: Exapinurus Nieszkowski 1859 [synonym]
G. †Cyamocephalus Currie 1927
Unr. Dekatriata Lamsdell 2013
Or. †Chasmataspidida Caster and Brooks 1956
Fm. †Chasmataspididae Caster and Brooks 1956
G. †Chasmataspis Caster and Brooks 1956
Chasmataspis laurencii Caster and Brooks 1956
Fm. †Diploaspididae Stormer 1972
G. †Achanarraspis Anderson et al. 2000
Achanarraspis reedi Anderson et al. 2000
G. †Diploaspis Størmer 1972
Diploaspis casteri Størmer 1972
Diploaspis muelleri Poschmann et al. 2005
G. †Dvulikiaspis Marshall et al. 2014
G. †Forfarella Dunlop et al. 1999
Forfarella mitchelli Dunlop et al. 1999
G. †Heteroaspis Størmer 1972
Heteroaspis stoermeri Novojilov 1959
Invalid names: Heteroaspis novojilovi Størmer 1972 [synonym]
G. †Loganamaraspis Tetlie and Braddy 2004
G. †Nahlyostaspis Marshall et al. 2004
G. †Octoberaspis Dunlop 2002
Octoberaspis ushakovi Dunlop 2002
G. †Skrytyaspis Marshall et al. 2014
Invalid names: Chasmataspidacea Caster and Brooks 1956 [empty], Diploaspidida Simonetta and Delle Cave 1978 [synonym], Heteroaspididae Størmer 1972 [empty]
Unr. Sclerophorata Kamenz et al. 2011
Cl. Arachnida Lamarck 1801
Subcl. Caulogastra Gall 1971
Invalid names: Labellata Petrunkevitch 1949 [empty]
G. †Cretopilio Fritsch 1910
Cretopilio granulatus Fritsch 1910
G. †Dinopilio Fritsch 1904
Dinopilio gigas Fritsch 1904
Unr. Haplocnemata Borner 1904
Or. Pseudoscorpiones Latreille 1817 [pseudoscorpion]
G. †Schneidarachne Dunlop and Rössler 2003
Or. Palpigradi Thorell 1888 [microwhip scorpion]
Fm. Eukoeneniidae Petrunkevitch 1955
G. †Paleokoenenia Rowland and Sissom 1980
Unr. Pantetrapulmonata Shultz 2007
G. †Ecchosis Selden and Shear 1991
Subcl. Tetrapulmonata Schultz 1990
Or. †Trigonotarbida Petrunkevitch 1949
Invalid names: Anthracomarti Karsch 1882 [replaced], Eurymarti Matthew 1895 [synonym]
Or. Parasitiformes Reuter 1909
Subor. Ixodida Leach 1815 [tick]
Subor. Mesostigmata Canestrini 1891
Invalid names: Gamasida Leach 1815 [synonym]
Subor. Opilioacarida Zachvatkin 1952
Or. †Phalangiotarbida Haase 1890 [phalangiotarbid]
Fm. †Anthracotarbidae Kjellesvig-Waering 1969
Fm. †Architarbidae Karsch 1882
Invalid names: Phalangiotarbidae Haase 1890 [synonym]
Fm. †Devonotarbidae Poschmann and Dunlop 2012
Fm. †Heterotarbidae Petrunkevitch 1913
Fm. †Opiliotarbidae Petrunkevitch 1945
Invalid names: Architarbida Petrunkevitch 1945 [synonym], Eotarbus Kušta 1889 [nomen dubium], Eotarbus litoralis Kušta 1889 [nomen dubium], Protopilio depressus Petrunkevitch 1913 [nomen dubium]
Unr. Poecilophysidea Pepato et al. 2010
Or. Acariformes Zakhvatkin 1952 [mite]
Or. Solifugae Sundevall 1833 [camel spider]
Or. Ricinulei Thorell 1876 [hooded tickspider]
Subor. Posteriorricinulei Wunderlich 2015
Subor. †Primoricinulei Wunderlich 2015
Invalid names: Palaeoricinulei Selden 1992 [empty]
G. †Saccogulus Dunlop et al. 2006
Saccogulus seldeni Dunlop et al. 2006
Unr. Stomothecata Shultz 2007
Or. Opiliones Sundevall 1833 [harvestman]
Or. Scorpiones Latreille 1817 [scorpion]
Invalid names: Acari Leach 1817 [invalid subgroup], Acaromorpha Dubinin 1957 [invalid subgroup], Arthrolycosa tarda Frič 1912 [nomen dubium], Podurites Matthew 1895 [nomen dubium], Podurites saltator Matthew 1895 [nomen dubium], Pseudoscorpionida Latreille 1817 [empty]
Or. †Eurypterida Burmeister 1843 [eurypterid]
Subor. †Eurypterina Burmeister 1843
Unr. †Diploperculata Lamsdell et al. 2013
Superfm. †Eurypteroidea Burmeister 1843
Superfm. †Megalograptoidea Caster and Kjellesvig-Waering 1955
Superfm. †Moselopteroidea Lamsdell et al. 2010
Superfm. †Onychopterelloidea Lamsdell 2011
G. †Wiedopterus Poschmann 2015
G. †Marsupipterus Caster and Kjellesvig-Waering 1955
Marsupipterus sculpturatus Caster and Kjellesvig-Waering 1955
G. †Parahughmilleria Kjellesvig-Waering 1961
Subor. †Stylonurina Diener 1924
Superfm. †Kokomopteroidea Kjellesvig-Waering 1966
Superfm. †Mycteropoidea Cope 1886
Invalid names: Hibbertopteroidea Kjellesvig-Waering 1959 [synonym]
Superfm. †Rhenopteroidea Størmer 1951
Invalid names: Brachyopterelloidea Tollerton 1989 [synonym]
Superfm. †Stylonuroidea Diener 1924
Invalid names: Hibbertopterina Stoermer 1974 [synonym], Woodwardopterina Kjellesvig-Waering 1959 [synonym]
G. †Unionopterus Chernyshev 1948
Invalid names: Belinuropsis Matthew 1910 [nomen dubium], Belinuropsis wigudensis Matthew 1910 [nomen dubium], Cyrtoctenida Stoermer and Waterston 1968 [synonym], Eurypteracea Burmeister 1845 [empty], Eurypterella Matthew 1889 [nomen dubium], Eurypterella ornata Matthew 1889 [nomen dubium], Gigantostraca Haeckel 1896 [synonym], Stylonuracea Diener 1924 [invalid subgroup]
G. †Pseudoniscus Nieszkowski 1859
Invalid names: Neolimulus Woodward 1868 [synonym]
J. C. Lamsdell 2013Prosomapoda lacking enlarged axial nodes on opisthosomal tergites; genal spines vestigial; opisthosoma broadest at third or fourth tergite; appendages of somite VII reduced; tergite of somite VII beginning to form microtergite.
No measurements are available
Locomotion: actively mobilep
Created: 2004-02-29 09:38:49
Modified: 2004-02-29 11:38:49
Source: p = phylum
Reference: Kiessling 2004

Age range

Maximum range based only on fossils: base of the Darriwilian to the top of the Holocene or 467.30000 to 0.00000 Ma
Minimum age of oldest fossil (stem group age): 460.9 Ma

Collections (952 total)

Oldest occurrences

Time interval Ma Country or state Original ID and collection number
Llanvirnian468.1 - 460.9USA (Tennessee) Chasmataspis laurencii (37450)
Darriwilian467.3 - 458.4USA (Iowa) Pentecopterus decorahensis (225212)
Black River460.9 - 457.5USA (New York) Eurypterida indet. (328)
Caradoc460.9 - 449.5USA (Virginia) Megalograptus alveolatus (204960)
Edenian460.9 - 449.5USA (Pennsylvania) Megalograptus sp. (34895)
Sandbian458.4 - 453.0United Kingdom (Wales) Brachyopterus stubblefieldi (206522)
Katian453.0 - 445.2Turkey Paraeurypterus anatoliensis (184932)
Katian453.0 - 445.2USA (New York) Echinognathus clevelandi (204767)
Katian453.0 - 445.2USA (Ohio) Megalograptus ohioensis (204962) Megalograptus shideleri (204963) Megalograptus welchi (204994) Megalograptus williamsae (204993)
Richmond - Ashgill449.5 - 443.7USA (Ohio) Megalograptus sp. (392)
Richmondian - Ashgill449.5 - 443.7USA (Ohio) Megalograptus sp. (393)
Hirnantian445.2 - 443.4South Africa Onychopterella augusti (26994)
Llandovery443.4 - 433.4USA (Pennsylvania) Parahughmilleria maria, Erettopterus globiceps, Hughmilleria shawangunk, Hardieopterus myops, Kiaeropterus otisius (12765)
Llandovery443.4 - 433.4United Kingdom (Scotland) Nanahughmilleria conica, Slimonia dubia, Carcinosoma scoticum, Drepanopterus bembycoides, Eurypterus cephalaspis, Eurypterus minor, Parastylonurus hendersoni, Laurieopterus elegans, Lamontopterus knoxae, Hardieopterus macrophthalmus, Drepanopterus pentlandicus (26885)
Llandovery443.4 - 433.4USA (Illinois) Onychopterella pumilis (13853)
Llandovery443.4 - 433.4Canada (Ontario) Carcinosoma libertyi (13854)
Llandovery - Wenlock443.4 - 427.4United Kingdom (Scotland) Nanahughmilleria lanceolata, Slimonia acuminata, Erettopterus bilobus, Hardieopterus lanarkensis (26886) Nanahughmilleria lanceolata, Slimonia acuminata, Erettopterus bilobus, Pterygotus lanarkensis, Paracarcinosoma obesus, Carcinosoma scorpionoides, Parastylonurus sigmoidalis (26889)
Llandovery - Wenlock443.4 - 427.4Libya Pterygotus sp., Carcinosoma sp. (26987)
Llandovery - Ludlow443.4 - 423.0USA (New York) Nanahughmilleria clarkei, Parahughmilleria maria, Erettopterus globiceps, Rhinocarcinosoma cicerops, Hughmilleria shawangunk, Ctenopterus cestrotus, Ruedemannipterus stylonuroides, Hardieopterus myops, Kiaeropterus otisius (12764)
Silurian443.4 - 419.2USA (New York) Carcinosoma sp. (10455) Nanahughmilleria prominens (13852) Pterygotus sp., Eurypterus remipes (10456) Slimonia sp. (10454)