Lanthanopilio chickeringi (Roewer, 1956) by Cokendolpher & Cokendolpher, 1984

Lanthanopilio chickeringi (Roewer, 1956)

Lanthanopilio Cokendolpher & Cokendolpher, 1984 is a monotypic genus of Phalangiidae, in the Dicranopalpus genus group. The only species is endemic from Costa Rica.

Type speciesEdit

Opilio chickeringi Roewer 1956, by original designation.


Originally in Phalangiinae, transferred to Dicranopalpus genus group by Crawford (1992)[1].


Lanthanopilio from Greek λανθανω (to mistake or escape notice) + pre-existing generic name Opilio. Gender masculine.


Lanthanopilio differs from all known genera of Phalangiinae by the unique features of the penis. The leathery exoskeleton with rows of large abdominal tubercles will likewise separate this genus from all known Phalangiinae in the New World. The trichoid "setae" (these structures appear to be outgrowths of the truncus, they do not appear to have sockets at their bases) and alate portion (which is membranous, not highly sclerotized) of the penis do not appear homologous with those of the Old World Opilio saxatilis C. L. Koch (see Spoek, 1963: figs. 12h-12j; Martens, 1978: figs. 429, 430). The penis stylus is short and thick as in some species of European Lacinius Thorell (see Silhavý, 1956: figs. 347, 348, 357, 359; Martens, 1978: figs. 620, 621). The sclerotized "horns" of the glans are unknown in any other species of phalangiid. The "alate" portion is also unlike those of any other species known. It resembles the alate portions of some Leiobuninae in that it is not sclerotized and is inflatable. Unfortunately, none of the unusual features of the new genus are shared by other genera, making comparisons difficult. Even under higher magnifications, it could not be determined if the glans was rigidly fixed to the truncus. New material which has not been in alcohol since 1905, may give new clues to the exact nature of the glans-truncus junction. Some trouble might exist in the separation of juvenile specimens of Metopilio from Lanthanopilio. Assuming juveniles of Lanthanopilio have the same number of tibiae II pseudosegments as adults (as do Metopilio spp.), the juveniles of Lanthanopilio should be easily recognised. Specimens with a single pseudosegment will be Lanthanopilio, whereas those with two to four will be Metopilio. [From Cokendolpher & Cokendolpher, 1984[2]].


  1. 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, Seattle, 8, 1–60.
  2. Cokendolpher, J.C. & Cokendolpher, Jean E. (1984) A new genus of harvestmen from Costa Rica with comments on the status of the Neotropical Phalangiinae (Opiliones, Phalangiidae). Bulletin of the British Arachnological Society, 6(4), 167–172.