Lucanidae
Guides
Aesalinae
Aesalinae is a subfamily of stag beetles (Lucanidae) established by William Sharp Macleay in 1819, with the type genus Aesalus. The subfamily contains three tribes: Aesalini (seven extant genera including Aesalus), Ceratognathini (four extant genera including Ceratognathus), and Nicagini (monotypic genus Nicagus). The group includes both extant and fossil taxa, with described fossil genera dating from the Jurassic and Cretaceous periods.
Apterocyclus
Kauai flightless stag beetles
Apterocyclus is a genus of flightless stag beetles endemic to the Hawaiian island of Kauai. The genus comprises five described species, ranging from 14 to 23 mm in length. These beetles represent the only native scarabaeoid beetles in the Hawaiian Islands. Three species (A. honoluluensis, A. kawaii, and A. waterhousei) have been confirmed living since the late 1960s, while others may be extinct. Historical collection data shows a dramatic decline, with over 130 specimens documented between 1871 and 1922 but very few found in recent decades.
Apterocyclus honoluluensis
Kauai Flightless Stag Beetle
Apterocyclus honoluluensis, the Kauai flightless stag beetle, is a flightless stag beetle endemic to the Hawaiian island of Kauai. It is the smallest and most commonly encountered species in its genus, with adults measuring 14–17 mm, rarely reaching 21 mm. The species has declined due to predation by introduced mice and habitat loss, and was considered for protection under the U.S. Endangered Species Act in 1994 but was declined due to insufficient data.
Apterocyclus munroi
Apterocyclus munroi is a species of stag beetle in the family Lucanidae. The species was described from four specimens collected on Kauai, Hawaii in 1897. No confirmed observations have been made since the original collection, and the species is considered possibly extinct. It belongs to a genus of flightless stag beetles endemic to the Hawaiian Islands.
Ceruchus
Ceruchus is a genus of stag beetles in the family Lucanidae, established by Macleay in 1819. The genus comprises approximately 18–19 described species. Members are saproxylic beetles associated with decaying wood. At least one species, Ceruchus chrysomelinus, is an endangered relict of natural Central European montane forests.
Ceruchus piceus
Red-rot Decay Stag Beetle
Ceruchus piceus is a species of stag beetle in the family Lucanidae, commonly known as the Red-rot Decay Stag Beetle. It is found in North America, with records from eastern Canada and the north-central United States. The species is associated with decaying wood habitats.
Lucaninae
stag beetles
Lucaninae is the largest subfamily of stag beetles (Lucanidae), characterized by distinctive morphological features including partially to completely divided eyes, geniculate antennae, and separated coxae. The group exhibits considerable diversity across multiple continents, with fossil records extending to the Early Cretaceous. Several genera within this subfamily display specialized ecological associations, including myrmecophily and wood-decay habitat specialization.
Lucanus placidus
Smooth Stag Beetle
Lucanus placidus is a species of stag beetle described by Thomas Say in 1825. It is commonly known as the Smooth Stag Beetle. The species occurs across much of eastern and central North America, with records extending from Ontario south to Alabama and west to New Mexico and Oregon. It is one of the more frequently observed Lucanus species in North America based on citizen science records.
Nicagus
Nicagus is a monogeneric genus of stag beetles (family Lucanidae) comprising three described species: N. japonicus (Japan), N. obscurus (eastern and central North America), and N. occultus (western Texas). The genus represents the tribe Nicagini within subfamily Aesalinae. The discovery of N. occultus in unvegetated sand dunes marked an unexpected range extension and unusual habitat for the family.
Nicagus obscurus
Nicagus obscurus is a small stag beetle in the family Lucanidae. Adults are found under bark of dead hardwoods, particularly oak. Larvae develop in rotten wood of hardwood logs and stumps, and have been specifically recorded from grooves of aspen driftwood. Adults emerge in August. The species occurs across eastern North America from Canada to the southeastern United States.
Nicagus occultus
Nicagus occultus is a species of stag beetle in the family Lucanidae, described in 2005 by Paulsen and Smith. It belongs to the subfamily Aesalinae, a group of small to medium-sized stag beetles often associated with decaying wood. The species is known from Texas, USA, and represents a relatively recent addition to the described North American lucanid fauna.
Platyceroides
Platyceroides is a genus of stag beetles (family Lucanidae) established by Benesh in 1946. The genus contains approximately 16 described species. It belongs to the tribe Platyceroidini within the subfamily Lucaninae.
Platyceroides aeneus
Platyceroides aeneus is a species of stag beetle in the family Lucanidae, first described by Van Dyke in 1928. The species is endemic to the Pacific Northwest of North America. It belongs to a genus of small stag beetles characterized by reduced mandibles compared to their larger relatives.
Platyceroides californicus
Platyceroides californicus is a species of stag beetle in the family Lucanidae, endemic to California. It is a small to medium-sized beetle with reduced mandibles compared to many lucanids. The genus Platyceroides is distinguished from the similar Platycerus by antennal club structure and male genitalia morphology. Very few observations exist for this species, and its biology remains poorly documented.
Platyceroides keeni
Keen's Stag Beetle
Platyceroides keeni is a species of stag beetle in the family Lucanidae, found in western North America from British Columbia to California. It is one of the smaller members of its genus and is associated with forested habitats. Adult beetles are active during warmer months, with larvae developing in decaying wood.
Platyceroides laticollis
Platyceroides laticollis is a species of stag beetle described by Casey in 1914. It belongs to the family Lucanidae, a group characterized by enlarged mandibles in males. The species has been documented in western North America, specifically in California and Oregon. Like other members of its genus, it is likely associated with decaying wood habitats.
Platyceroides latus
Platyceroides latus is a stag beetle species described by Fall in 1901. It belongs to the family Lucanidae, a group characterized by enlarged mandibles in males. The species is known from a limited number of observations, with records concentrated in California and Nevada. Its biology remains poorly documented.
Platyceroides opacus
Platyceroides opacus is a species of stag beetle in the family Lucanidae. It is known from California in western North America. The genus Platyceroides contains small to medium-sized stag beetles with reduced mandibles compared to many other lucanids.
Platyceroides viriditinctus
Platyceroides viriditinctus is a species of stag beetle in the family Lucanidae, described by Benesh in 1942. It is known from the Pacific Northwest region of North America, with confirmed records from Oregon and Washington. Like other members of the genus Platyceroides, it belongs to a group of small stag beetles that are less well-studied than their larger relatives in the genus Lucanus.
Platyceroidini
Platyceroidini is a tribe of stag beetles (Lucanidae) established by Paulsen & Hawks in 2008. It belongs to the subfamily Lucaninae, the largest subfamily within the stag beetle family. The tribe was erected to accommodate certain genera previously placed elsewhere within Lucaninae, reflecting phylogenetic revisions based on morphological and molecular data. As a relatively recently defined taxon, its circumscription and constituent genera reflect modern systematic approaches to lucanid classification.
Platycerus depressus
Aspen stag beetle (eastern)
Platycerus depressus is a species of stag beetle in the family Lucanidae, described by Joseph LeConte in 1850. It is one of the smaller stag beetles in North America and is associated with aspen and other deciduous trees. The species is widely distributed across boreal and temperate regions of Canada and the northern United States. It is commonly known as the eastern aspen stag beetle due to its association with Populus tremuloides and related host trees.
Platycerus oregonensis
Oregon Stag Beetle
Platycerus oregonensis is a species of stag beetle in the family Lucanidae, first described by John O. Westwood in 1844. It is commonly known as the Oregon Stag Beetle. The species belongs to the subfamily Lucaninae and is part of the genus Platycerus, which contains small to medium-sized stag beetles with distinctive mandible morphology.
Sinodendron
Sinodendron is a genus of stag beetles in the family Lucanidae. The genus comprises three recognized species: S. cylindricum, S. persicum, and S. rugosum. Species are distributed across Europe, Western Asia, and North America. Members are saproxylic wood-boring beetles associated with decaying wood.
Syndesinae
Syndesinae is a subfamily of stag beetles (family Lucanidae) containing at least two genera and four described species. The subfamily includes the genera Ceruchus and Sinodendron. Members of this group are part of the scarabaeoid beetle lineage within the order Coleoptera.