Laniatores

Thorell, 1876

Armored Harvestmen

Family Guides

6

Laniatores is the largest suborder of harvestmen (Opiliones), comprising over 4,200 described worldwide. Members are characterized by relatively short legs, heavily sclerotized body armor, and spiny . They are predominantly found in humid tropical and temperate forest , where they inhabit leaf litter, caves, and spaces under logs and stones. The suborder exhibits remarkable diversity with many short-range species showing high genetic divergence despite restricted distributions.

Sclerobunus robustus by (c) Marshal Hedin, some rights reserved (CC BY). Used under a CC-BY license.Sitalcina sura by (c) Evrytte Carlson, some rights reserved (CC BY), uploaded by Evrytte Carlson. Used under a CC-BY license.Sitalcina lobata by (c) Evrytte Carlson, some rights reserved (CC BY), uploaded by Evrytte Carlson. Used under a CC-BY license.

Pronunciation

How to pronounce Laniatores: //læˈniəˌtɔriːz//

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Identification

The consists of a single piece with the entirely fused to the abdominal scutum. The pedipalpus is robust and armed with strong spines. The ovipositor is short and unsegmented. The is complex with multiple , some movable, typically operating via pressure rather than direct musculature. The third and fourth pairs of legs bear paired or branched claws.

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Habitat

Highly dependent on humid environments; predominantly tropical and temperate forests. Found in leaf litter, under logs and stones, and in caves. Many show specific affinity for cave environments, with some exhibiting troglomorphic adaptations.

Distribution

Worldwide distribution with highest diversity in tropical regions. The infraorder Insidiatores (Travunioidea and Triaenonychoidea) represents temperate counterparts—Travunioidea in northern temperate regions and Triaenonychoidea in southern temperate regions. Remaining superfamilies are tropical with notable . Gonyleptidae is to the Neotropics. Zalmoxidae occurs in Southeast Asia including Philippines and Borneo.

Behavior

Typically secretive, hiding under logs, stones, and in leaf litter. Some cave-dwelling are highly modified with reduced pigmentation and eyelessness, exhibiting sedentary as . Many species show size dimorphism within without genetic divergence indicating separate species.

Ecological Role

Important component of forest floor and cave . The high diversity and local of Laniatores makes them significant indicators for biodiversity assessment and conservation prioritization, particularly in cave systems and montane forests.

Human Relevance

Subject of taxonomic research due to high undescribed diversity. Some cave-dwelling have restricted distributions making them vulnerable to disturbance and candidates for conservation protection.

Similar Taxa

  • PalpatoresLong-legged harvestmen with slender bodies and typically enlarged in males, versus the short-legged, hard-plated, spiny- of Laniatores
  • DyspnoiShares the short unsegmented ovipositor with Laniatores, but differs in body form and leg proportions; Dyspnoi typically have more elongate bodies and different structure
  • EupnoiLong-legged harvestmen with distinct ocularium and different structure; lack the and robust spiny pedipalps characteristic of Laniatores

Sources and further reading