Silphidae | ||||
In the UK a small family of very distinctive
species; they will be recognised by their large size and often distinctive colouration. Many
species feed on carcasses and the larvae of other insects associated with them, carrion left
out to attract them will not disappoint. They are strong fliers and very sensitive to the odour of decaying flesh.
Adults are usually found in pairs and , until they have buried their carcass, will drive off others. Fur or feathers are removed
before burial and these indicate where the insects may be unearthed. After burying the carcass a female Nicrophorus will dig
an adjacent tunnel or small gallery in which to lay eggs, around 15 in the case of Nicrophorus vespillo, then return to the carcass to feed. Development
is rapid, larvae hatch after a week or so and undergo hypermetamorphosis, the first, second and third instars being distinct.
At first they are fed liquid food by the female but after 5 or 6 hours can feed themselves. For a while after the first or second moults
they are again dependant on the mother for food. Fully grown larvae burrow horizontally away from the feeding
chamber, up to 30cm., to construct earthen pupal chambers. In Nicrophorus the pupal stage lasts about 2 weeks. Other genera are carrion feeders or predacious at carrion e.g. Thanatophilus and Oiceoptoma. Some Silpha species feed on snails while Dendroxena feed nocturnally on Lepidoptera larvae on trees. 7 genera, 21 species. 9-30mm. Head narrower, and often very much so, than pronotum. Mandibles very robust and often produced forward. Eyes prominent and well developed e.g. Nicrophorus. Antennae 11 segmented with 2nd joint sometimes very small, symetrically clubbed (cf. Lucanidae, Scarabaeidae) or distally thickened. Basal joint elongate but not well developed into a scape (cf. Histeridae). Pronotum variously sculptured but usually strongly explanate, bordered and narrowed anteriorly. Front margin smoothly rounded e.g. Silpha or emarginate e.g. Aclypea and Thanatophilus. Elytra truncate in Nicrophilus and Necrodes leaving 3-4 abdominal segments exposed but entire in most British species. Usually with well developed longitudinal ridges, coarsely punctate and variously pubescent (well developed in Aclypea) Legs robust, tibia with outwardly facing terminal spines (not present in Necrodes), these especially well developed on protibia which may be developed for fossorial habits. Tarsi 5-5-5 with well developed claws. |
||||
![]() Nicrophorus humator |
||||
![]() Nicrophorus vespillo |
||||
Nicrophorus vespilloides |
||||
![]() Silpha atrata |
Silpha atrata |
Silpha atrata |
||
![]() Silpha laevigata |