Belongs within: Sclerosomatidae.
Leiobunum has been recognised has a widespread Holarctic genus of generalised sclerosomatid harvestmen; however, recent phylogenetic analyses have indicated that this genus is widely polyphyletic. The type species is L. rotundum which is widespread in Europe; males of this species are solidly brick red whereas females are yellowish-red with a black saddle (Martens 1978). Leiobunum rupestre is a central European species with a largely dark dorsum and yellowish underside (Martens & Schönhofer 2016).
Characters (Roewer 1923): Eyemound as long as broad and high, dorsally smooth or finely granulate or denticulate. Anterior margin of carapace without a median protrusion; dorsum of carapace and opisthosoma usually unarmed; tergites 1–5 of opisthosoma sometimes forming a hard scutum in male. Coxae I–IV each with one anterior and one posterior marginal row of denticles, rarely only anterior margin of coxa I and posterior margin of coxa IV with denticle row. Supracheliceral lamellae usually smooth. Cheliceral segment I dorsally smooth. Pedipalp without apico-medial apophyses on patella and tibia (very rare incipient apophysis on patella). Legs very long and very thin; femur I usually much longer than body, very rarely only as long as body.
<==Leiobunum Koch 1839MS16 [=Leiobunus Meade 1855C92, Liobunum Agassiz 1846CZ04]
|--L. rotundum (Latreille 1798)MS16 (see below for synonymy)
|--L. albigenum Sørensen 1911 [=Liobunum albigenum]R23
|--L. alvarezi Goodnight & Goodnight 1945GG45
|--L. anatolicum Roewer 1957K14
|--L. apenninicum (Martens 1969) [=Nelima apenninica]MS16
|--L. argentipalpe Prieto & Fernández 2007PW17
|--L. biseriatum Roewer 1910 [=Liobunum biseriatum]R23
|--L. bolivari Goodnight & Goodnight 1945GG46
|--L. bruchi Mello-Leitao 1933GG45
|--L. caporiaccoi Roewer 1957R57
|--L. coccineum Simon 1878 [=Liobunum coccineum]R23
|--L. consimile Banks 1900GG45 [=Liobunum consimileR23; incl. Li. dugesi Banks 1908GG45]
|--L. cretatum Crosby & Bishop 1924D34 [incl. L. lineatum Edgar 1962E90]
|--L. cupreum Simon 1878 [=Liobunum cupreum]R23
|--L. cypricum Roewer 1957R57
|--L. davisi Roewer 1952CZ04
|--L. defectivum Rambla 1959PW17
|--L. denticulatum Banks 1900GG46 [=Liobunum denticulatumR23]
|--L. depressum Davis 1934D34
|--L. desertum Goodnight & Goodnight 1944GG45
|--L. dromedarium Cambridge 1904GG46 [=Liobunum dromedariumR23]
|--L. ephippiatum Roewer 1910D34 [=Liobunum ephippiatumR23]
|--L. escondidum Chamberlin 1925GG46
|--L. fuscum Roewer 1910 [=Liobunum fuscum]R23
|--L. ghigii Di Caporiacco 1929K14
|--L. gracile Thorell 1876 (see below for synonymy)MS16
|--L. granulosum Prieto & Fernández 2007PW17
|--L. guerreroensis Goodnight & Goodnight 1946GG46
|--L. hedini Roewer 1936R57
|--L. heinrichi Roewer 1957R57
|--L. hongkongium Roewer 1957R57
|--L. incantaturbs Prieto & Wijnhoven 2017PW17
|--L. insignitum Roewer 1910 [=Liobunum insignitum]R23
|--L. insulare Roewer 1957R57
|--L. ischionotatum (Dugès 1884) (see below for synonymy)R23
| |--L. i. ischionotatumR23
| `--L. i. luteovittatum Roewer 1912 [=Liobunum luteovittatum]R23
|--L. levantinum Prieto & Fernández 2007PW17
|--L. limbatum Koch 1861N05 (see below for synonymy)
|--L. lindbergi Roewer 1959K14
|--L. longipes Menge 1854PP19 [=L. saparum Menge in Koch & Berendt 1854 (n. n.)D07; incl. L. inclusum Roewer 1939S02]
|--L. lusitanicum Roewer 1923 [=Liobunum lusitanicum]R23
|--L. marmoratum Cambridge 1904 [=Liobunum marmoratum]R23
|--L. mesopunctatum Goodnight & Goodnight 1942GG42
|--L. messelense Bartel, Dunlop & Wedmann 2024BDW24
|--L. metallicum Roewer 1932R57
|--L. mexicanum Banks 1898 [=Liobunum mexicanum]R23
|--L. mirum Roewer 1957R57
|--L. nigrigenum Goodnight & Goodnight 1945GG45
|--L. nigripalpe Simon 1889MS16 [=Liobunum nigripalpeM78, Nelima nigripalpisM78, Nelimus (Liobunum) nigripalpisD04]
|--L. nycticorpum Goodnight & Goodnight 1942GG46
|--L. oregonense Goodnight & Goodnight 1943GG43
|--L. religiosum Simon 1879 [=Liobunum religiosum, Nelima religiosa]M78
|--L. roseum Koch 1839 [=Liobunum roseum]M78
|--L. rumelicum Šilhavý 1965N05
|--L. rupestre (Herbst 1799) (see below for synonymy)MS16
|--L. schaali Bartel, Dunlop & Wedmann 2024BDW24
|--L. seriatum Simon 1878K14 [=Liobunum seriatumR23]
|--‘Lejobunum’ (l. c.) seriepunctatum Doleschall 1852 (n. d.)R23
|--L. socialissimum Koch 1873 [=Liobunum socialissimum]R23
|--L. subalpinum Komposch 1998MS16
|--L. supracheliceralis Roewer 1957R57
|--L. trimaculatum Goodnight & Goodnight 1943GG43
|--L. veracruzensisHT12
|--L. viridorsum Goodnight & Goodnight 1942GG42
`--L. zimmermani Roewer 1952CZ04
Nomen nudum: Leiobunum luteumTM00
Leiobunum gracile Thorell 1876 [=Liobunum gracile, Nelima gracilis; incl. Li. laeve Thorell 1876, Nelima laevis, N. melanogranulata Morin 1934, Liobunum norvegicum Strand 1900, N. norvegica, Li. norwegicum (l. c.), N. norwegica (l. c.), Leiobunum tisciae Avram 1968]MS16
Leiobunum ischionotatum (Dugès 1884) [=Opilio ischionotatus, Liobunum ischionotatus; incl. Egaenus mexicanus Becker 1886 non Leiobunum mexicanum Banks 1898]R23
Leiobunum limbatum Koch 1861N05 [=Liobunum limbatumD04, Liobunus limbatusD04; incl. Liobunum limbatum var. fischeri Heller 1903D04, Liobunum purpurissatum Koch 1869D04]
Leiobunum rotundum (Latreille 1798)MS16 [=Phalangium rotundumS08, Leiobunus rotundusC92, Liobunum rotundumC92; incl. Phalangium decemmaculatum Razoumowsky 1789D04, Opilio fasciatus Herbst 1798MS16, *Leiobunum fasciatumMS16, Phalangium filipes Lucas 1847D04, Opilio hemisphaericus Herbst 1799D04, P. hemisphaericumD04, P. longipes Hahn 1834D04, Cerastoma longipesR12, P. rufum Hermann 1804D04, Leiobunum rufumD04]
Leiobunum rupestre (Herbst 1799) [=Opilio rupestris, Liobunum rupestre, Liobunus rupestris; incl. Liobunum glabrum Koch 1869, Nelima glabra, Leiobunum ovale Koch 1848]MS16
*Type species of generic name indicated
References
[BDW24] Bartel, C., J. A. Dunlop & S. Wedmann. 2024. Iridescent harvestmen (Arachnida: Opiliones: Sclerosomatidae) from the Eocene of Messel, Germany. Palaeobiodiversity and Palaeoenvironments.
[CZ04] Cokendolpher, J. C., & K. R. Zeiders. 2004. Clarence Moores Weed (1864–1947) and notes on his species of Opiliones (Arachnida). Occasional Papers Museum of Texas Tech University 237: 1–14.
[C92] Crawford, R. L. 1992. Catalogue of the genera and type species of the harvestman superfamily Phalangioidea (Arachnida). Burke Museum Contributions in Anthropology and Natural History 8: 1–60.
[D34] Davis, N. W. 1934. A revision of the genus Leiobunum (Opiliones) of the United States. American Midland Naturalist 15 (6): 662–705.
[D04] Delfosse, E. 2004. Catalogue préliminaire des Opilions de France métropolitaine (Arachnida Opiliones). Bulletin de Phyllie 20: 34–58.
[D07] Dunlop, J. A. 2007. Paleontology. In: Pinto-da-Rocha, R., G. Machado & G. Giribet (eds) Harvestmen: The Biology of Opiliones pp. 247–265. Harvard University Press: Cambridge (Massachusetts).
[E90] Edgar, A. L. 1990. Opiliones (Phalangida). In: Dindal, D. L. (ed.) Soil Biology Guide pp. 529–581. John Wiley & Sones: New York.
[GG42] Goodnight, C. J., & M. L. Goodnight. 1942. New and little known Phalangida from Mexico. American Museum Novitates 1163: 1–16.
[GG43] Goodnight, C. J., & M. L. Goodnight. 1943. New and little known phalangids from the United States. American Midland Naturalist 29 (3): 643–656.
[GG45] Goodnight, C. J., & M. L. Goodnight. 1945. Additional Phalangida from Mexico. American Museum Novitates 1281: 1–17.
[GG46] Goodnight, C. J., & M. L. Goodnight. 1946. Additional studies of the phalangid fauna of Mexico. 1. American Museum Novitates 1310: 1–17.
[HT12] Hedin, M., N. Tsurusaki, R. Macías-Ordóñez & J. W. Shultz. 2012. Molecular systematics of sclerosomatid harvestmen (Opiliones, Phalangioidea, Sclerosomatidae): geography is better than taxonomy in predicting phylogeny. Molecular Phylogenetics and Evolution 62 (1): 224–236.
[K14] Kurt, K. 2014. Updated checklist of harvestmen (Arachnida: Opiliones) in Turkey. Arch. Biol. Sci. 66 (4): 1617–1631.
[M78] Martens, J. 1978. Spinnentiere, Arachnida: Weberknechte, Opiliones. Gustav Fischer Verlag: Jena.
[MS16] Martens, J., & A. L. Schönhofer. 2016. The Leiobunum rupestre species group: resolving the taxonomy of four widespread European taxa (Opiliones: Sclerosomatidae). European Journal of Taxonomy 216: 1–35.
[N05] Novak, T. 2005. An overview of harvestmen (Arachnida: Opiliones) in Bosnia and Herzegovina. Natura Croatica 14 (4): 301–350.
[PP19] Palencia, L., E. Peñalver, C. E. Prieto & F. J. Poyato-Ariza. 2019. First fossil harvestmen (Arachnida: Opiliones) from Spain and notes on the fossil record of Opiliones. Palaeontologica Electronica 22.1.5A: 1–18.
[PW17] Prieto, C. E., & H. Wijnhoven. 2017. A new Leiobunum species from the Iberian Peninsula (Opiliones: Sclerosomatidae: Leiobuninae). Revista Ibérica de Aracnología 30: 3–10.
[R12] Roewer, C.-F. 1912. Revision der Opiliones Palpatores (=Opiliones Plagiostethi). II. Teil: Familie der Phalangiidae. (Subfamilien: Sclerosomini, Oligolophini, Phalangiini). Abhandlungen aus dem Gebiete der Naturwissenschaften, herausgegeben vom Naturwissenschaftlichen Verein in Hamburg 20 (1): 1–295.
[R23] Roewer, C.-F. 1923. Die Weberknechte der Erde: Systematische Bearbeitung der bisher bekannnten Opiliones. Gustav Fischer: Jena.
[R57] Roewer, C. F. 1957. Über Oligolophinae, Caddoinae, Sclerosomatinae, Leiobuninae, Neopilioninae und Leptobuninae (Phalangiidae, Opiliones Palpatores). Senckenbergiana Biologica 38 (5–6): 323–358.
[S08] Shultz, J. W. 2008. Leiobunum nigripes is a junior synonym of Leiobunum verrucosum (Opiliones, Sclerosomatidae). Journal of Arachnology 36 (1): 184–186.
[S02] Staręga, W. 2002. Baltic amber harvestmen (Opiliones) from Polish collections. Annales Zoologici 52 (4): 601–604.
[TM00] Tsurusaki, N., & H. Minato. 2000. Opiliones of Wakayama Prefecture, Honshu, Japan. Nankiseibutu 42 (1): 3–8.