Sclerosomatidae
Guides
Eumesosoma nigrum
Eumesosoma nigrum is a species of harvestman (Opiliones) in the family Sclerosomatidae, first described by Thomas Say in 1821. The species is known from very few observations, with only three records documented in iNaturalist. As a member of the Leiobuninae subfamily, it belongs to a group of long-legged harvestmen commonly found in North America.
Hadrobunus
Hadrobunus is a genus of harvestmen (order Opiliones) in the family Sclerosomatidae, established by Banks in 1900. The genus contains approximately six described species distributed primarily in the eastern United States and Mexico. Species in this genus are characterized by their elongated body form and relatively large size compared to many other sclerosomatid harvestmen.
Hadrobunus grandis
Hadrobunus grandis is a harvestman (Opiliones) species found in the eastern and central United States. Adults are active in early summer. The species was first described by Thomas Say in 1821. It belongs to the family Sclerosomatidae, a diverse group of long-legged arachnids commonly encountered in temperate North American forests and woodlands.
Hadrobunus maculosus
Speckled Harvestman
Hadrobunus maculosus is a harvestman (Opiliones) commonly known as the Speckled Harvestman. It belongs to the family Sclerosomatidae and occurs in North America, with confirmed records from Vermont and surrounding regions. As with other harvestmen, it is often mistaken for a spider but possesses key anatomical differences.
Leiobunum calcar
Leiobunum calcar is a species of harvestman (order Opiliones) in the family Sclerosomatidae. It is found in North America, with confirmed records from Vermont. The species was first described by Wood in 1868. Like other members of the genus Leiobunum, it is a long-legged arachnid commonly encountered in wooded habitats.
Leiobunum crassipalpe
Leiobunum crassipalpe is a harvestman species in the family Sclerosomatidae, first described by Nathan Banks in 1900. It belongs to a genus characterized by exceptionally long legs and elongated body forms. The species occurs in the south-central United States, where it inhabits wooded habitats. Males possess distinctive enlarged pedipalps that extend dorsally above the ocularium.
Leiobunum politum
Leiobunum politum is a medium-sized harvestman (order Opiliones) in the family Sclerosomatidae. Originally described from Illinois in 1889, this species is widely distributed across the eastern and southeastern United States, with highest abundance in the Appalachian Mountains. It has been frequently confused with the similar Leiobunum bracchiolum due to overlapping external morphological features.
Leiobunum relictum
Leiobunum relictum is a species of harvestman (order Opiliones) in the family Sclerosomatidae, described by Davis in 1934. The species name 'relictum' (meaning 'left behind' or 'relict') suggests a population isolated from formerly more widespread distribution. It is recorded from North America, though specific locality details and ecological data remain sparse in published sources.
Leiobunum serratipalpe
Leiobunum serratipalpe is a species of harvestman (order Opiliones, family Sclerosomatidae) described by Roewer in 1910. The species is currently considered a synonym of Leiobunum calcar in some taxonomic databases, though this status may reflect ongoing taxonomic revision in this notoriously difficult genus. Like other members of Leiobunum, it possesses the characteristic long, slender legs and ocularium typical of the family. Species in this genus are common inhabitants of wooded habitats across eastern North America.
Leiobunum townsendi
Leiobunum townsendi is a species of harvestman (order Opiliones) in the family Sclerosomatidae, native to North America. Like other members of the genus Leiobunum, it possesses the characteristic long, slender legs and compact body typical of long-legged harvestmen. The species was described by Weed in 1893.
Leiobunum uxorium
Leiobunum uxorium is a harvestman species in the family Sclerosomatidae, described by Crosby and Bishop in 1924. It occurs in North America. As with other members of the genus Leiobunum, it possesses the characteristic long, slender legs typical of long-legged harvestmen (Palpatores). The species is part of a taxonomically challenging genus where precise identification often requires examination of subtle morphological features.
Leiobunum ventricosum
Early-Season Group
Leiobunum ventricosum is a species of harvestman in the family Sclerosomatidae, first described by Wood in 1868. It belongs to the genus Leiobunum, a group of long-legged harvestmen that are notoriously difficult to identify to species level. The species is found in North America, with confirmed records from Vermont and other regions. Like other members of its genus, it possesses distinctive morphological features including an ocularium—a raised structure bearing the eyes—and elongated legs, with the second pair often held aloft and waved as sensory appendages.
Leiobunum verrucosum
Warty Harvestman
Leiobunum verrucosum is a species of harvestman in the family Sclerosomatidae, commonly known as the Warty Harvestman. It is native to North America. The species belongs to a genus whose members are known for their exceptionally long legs and are common inhabitants of wooded habitats.
Trachyrhinus marmoratus
A species of harvestman in the family Sclerosomatidae, described by Banks in 1894. As with other harvestmen in the genus Trachyrhinus, it belongs to the order Opiliones—arachnids distinct from spiders that lack fangs, venom glands, and silk production. Members of this genus are known to employ chemical defenses through repugnatorial glands.