Silphidae

Latreille, 1807

carrion beetles, burying beetles, large carrion beetles, sexton beetles

is a of commonly known as or burying beetles, comprising approximately 183 in two tribes: Silphini and Nicrophorini. Members feed primarily on decaying matter, particularly animal carcasses, with some species exhibiting specialized behaviors such as burying small carcasses and providing parental care. The family has forensic importance due to predictable patterns on human remains. Silphidae are most diverse in temperate regions, with capability varying among species and correlated with food source .

Nicrophorus mexicanus by (c) Jared Shorma, some rights reserved (CC BY), uploaded by Jared Shorma. Used under a CC-BY license.

Nicrophorus obscurus by (c) Bennett Grappone，保留部分权利（CC BY）, 由 Bennett Grappone 上传. Used under a CC-BY license.

Nicrophorus nigrita by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.

Pronunciation

How to pronounce Silphidae: /sɪlˈfɪdiː/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

can be distinguished from other by their clubbed , which consist of 15 . The two tribes differ in antennal structure: Nicrophorini have antennae with an abruptly capped , while Silphini have a more gradual club shape. Many Nicrophorini display bright orange coloration on the , whereas Silphini are typically dark in gold, black, and . Size ranges from 7 to 45 mm. The presence of five tarsal segments on each leg distinguishes them from (), which have only four segments on the hind leg .

Images

Habitat

occupy diverse including forests, meadows, grasslands, and human-modified environments. Forest habitats are preferred by some , such as Oiceoptoma thoracicum, which shows clear preference for woodland over meadows and avoids forest-meadow . Species distribution across habitats correlates with capability: flight-capable species typically feed on vertebrate carcasses, while flightless species feed on soil . Many species are attracted to carrion in open areas, roadways, and along woodland edges.

Distribution

Worldwide distribution with greatest diversity in temperate regions of the Northern Hemisphere. Approximately 46 occur in North America. In Europe, species such as Oiceoptoma thoracicum are present. The is relatively rare in tropical regions, though some tropical species exist. Nicrophorus nepalensis occurs in the mountains of eastern Asia and the Malay Archipelago, including India and Pakistan. Distribution records include Denmark, Norway, Sweden, Vermont (USA), and broader US locations. Mexican species have been documented from Sonora and Hidalgo among other states.

Seasonality

activity varies by and region. In temperate North America, adults are active from early spring through autumn; for example, Heterosilpha ramosa is active March through October, and Aclypea bituberosa from March through November. Nicrophorini breeding activity peaks during the height of breeding season when competition for carcasses intensifies. occurs as adults in many species.

Diet

and feed on decaying matter, primarily animal carcasses in various stages of decomposition. Silphini feed mainly on masses present on carrion, with adults colonizing during bloated and decaying stages. Nicrophorini colonize earlier in decomposition to avoid competition with maggots and will abandon carcasses with large maggot masses. Some are : Aclypea bituberosa feeds on spinach, beets, pumpkin, squash, wheat, radish, rhubarb, potato, lettuce, cabbage, turnip, rapeseed, and Chenopodiaceae and Solanaceae plants; Aclypea opaca feeds on beets; Necrophila americana occasionally feeds on pumpkins, spinach, and sugar beets. Larvae of both tribes consume decaying organic material while adults primarily consume maggots.

Life Cycle

with , larval, pupal, and stages. Silphini development is slower, requiring 26 to 58 days from egg to adult: eggs hatch in 2 to 7 days, through three over 10 to 30 days feeding on carrion, then disperse to pupate for 14 to 21 days. Nicrophorini development is faster: eggs hatch in 12 to 48 hours, larval duration varies with food availability and parental care, and lasts 6 to 8 days in soil. Aclypea bituberosa has one per year: eggs laid in soil hatch in about one week, first two instars last about five days each, third instar lasts approximately 15 days, pupation occurs 1 to 2 inches deep in soil for about three weeks, with adults .

Behavior

Nicrophorini exhibit elaborate parental care: pairs cooperate to locate, bury, and prepare small animal carcasses by removing hair or feathers and shaping flesh into a ball. regurgitate liquefied food to feed , and may adjust size by consuming excess young if carrion is insufficient. Males guard females through antennal grasping during courtship and early breeding, releasing to mate and stroking the female's with their ; this continues until and larvae are present. Both sexes cooperate in brood care, though males may emit to attract additional females when large carcasses are available, reducing the primary female's reproductive success. Communal breeding with cooperative female care occurs on large carcasses under intense competition. Silphini exhibit little to no parental care and breed on large carrion without burying behavior. Adults are primarily , reducing competition with . Chemical defense via rectal gland secretion of aliphatic acids and terpene alcohols occurs in some species; Necrodes surinamensis can spray this secretion in all directions by rotating its . is primarily , with capability varying among species.

Ecological Role

serve as important and nutrient recyclers in terrestrial , breaking down animal carcasses and accelerating decomposition. They compete with for carrion resources; Nicrophorini bury carcasses to exclude competitors, while Silphini consume fly directly. Nicrophorini engage in mutualistic relationships with phoretic of the Poecilochirus, which are transported to carcasses and feed on fly and , reducing competition for the . Some function as of soft-bodied . As forensic indicators, Silphidae help estimate post-mortem intervals based on timing and larval development stages, though their tendency to eradicate earlier-colonizing species can complicate interval . Flightless species contribute to soil invertebrate .

Human Relevance

have significant forensic importance in medicocriminal ; their predictable patterns and developmental rates assist in estimating post-mortem intervals. Nicrophorus americanus ( burying ) is federally endangered in the United States, known from only six states. Some are occasional agricultural pests: Aclypea bituberosa damages spinach, beets, and other ; Aclypea opaca feeds on beets; Necrophila americana occasionally damages pumpkins and spinach. Most species are , reducing carrion accumulation and associated foul odors, and suppressing through competition and . The has been used in fermenting traps for beetle .

Similar Taxa

Staphylinidae share similar body form and carrion-associated habits, but have short exposing most of the and lack the 15-segmented clubbed characteristic of .
Tenebrionidae can resemble dark Silphini , but have only four tarsal on the hind leg versus five in , and lack the pronounced .
Dermestidae and have that resemble some larvae and feed on dry matter, but have different antennal structure and are not primarily associated with fresh carrion.
AgyrtidaeHistorically included within , now recognized as a separate ; distinguished by various morphological features including different antennal and leg structures.

Misconceptions

are sometimes incorrectly referred to as a of in older or erroneous sources; they constitute a valid within . The "" is sometimes applied to unrelated that feed on carrion. Nicrophorus americanus ( burying beetle) is frequently confused with Necrophila americana (American carrion beetle), but the former is a federally endangered Nicrophorini that buries carcasses, while the latter is a more common Silphini species that does not bury carcasses. The etymology of "silphid" has been mistakenly associated with forest due to the Latin "silva," but the name derives from Paracelsus's "sylph" referring to air spirits.

More Details

Forensic Methodology

Recent studies have improved post-mortem interval by measuring maximum cranial width and heavily sclerotized larval areas rather than body length, which varies considerably. identification using distinct morphological features provides the most accurate developmental staging, though this is only possible for with fully described larval instars such as Thanatophilus rugosus. The presence of phoretic Poecilochirus without can indicate prior and departure, aiding in corpse relocation .

Flight Evolution

loss has evolved multiple times within and is associated with shifts from vertebrate carrion to soil . Flightless show increased production, possibly due to more limited but reliable food supplies. presence does not necessarily indicate flight capability.

Conservation Status

Nicrophorus americanus, the burying , is the only federally in the , restricted to six US states. fragmentation, artificial lighting, and reduced availability of small vertebrate carcasses have contributed to its decline.