|Anobium (=Hemicoelus) fulvicorne (Sturm, 1837)|
|In the UK a mainly southern species with many modern records throughout the
southeast north to Nottinghamshire, beyond this there are two records from north Yorkshire. There are no records
west of a line from south Hampshire to Bristol and, with the exception of the northwest coast, most Welsh
records are from the east (NBN). Quoted in Hickin
as 'rather common', and by Joy as local
(Eng, S to Wales,N), we have recorded this species during June and July in woodland and wooded parkland throughout
our area. Typically the species develops in small dead branches of a wide range of broadleaved trees in woodland,
parkland, hedgerows etc (Alexander) although there
may be, at least on the continent, a preference for Quercus (Oak)(Hurka). We have records from Fagus
(Beech). Quercus (Oak) and Alnus; the Alders at Cassio bridge have repeatedly produced adults.
2.5-4mm. Antennae red with first segment darker, very distinctive; segment 1 broad and curved outward, 2 broad and slightly elongate, 3-8 much narrower, 9-11 long with 9 and 10 expanded on inner side. Last 3 segments much longer in male than female. Inserted before eyes, separation about twice the length of basal segment. Head strongly deflexed, not visible in normal setting. Pronotum highly arched, with transverse basal fovea and fine recumbent pubescence (X50). Broadest at base and slightly narrower than elytra at shoulders. Elytra very elongate, with ten complete and strongly punctate striae, 7 and 8 continued onto humeral prominence. Interstices with strong granular microsculpture merging into transverse rugosity at base. Widely explanate apically forming a straight hind margin, that part of the lateral margin visible from above weakly serrate (X50). With fine and dense recumbent pubescence throughout, entire upper surface black but for narrowly red apical angles of elytra. Legs red, femora darker. Tarsal segments 3 and 4 bilobed. Claws simple, weakly toothed at base.
Description from 1 Watford specimen at X40
A further species A.nitidus (Fab.), has been added to our list since publication of Joy's handbook, it is similar to fulvicorne but narrower, the striae are more strongly punctate and the terminal antennal segments more elongate. A.nitidus is distinct in having the eyes obviously pubescent at X40, in fulvicorne they appear glabrous at this power although short and sparse pubescence becomes visible at higher magnification. There are also differences in the pronotal tubercle and side margins which in nitidus are distinctly denticulate, in fulvicorne they are only faintly so. In fulvicorne the terminal tarsal segment on each leg is broadly dilated towards the apex, in nitidus it is much less so. Colouration of nitidus is lighter, dark brown to brownish black, and uniform throughout, in lighter teneral specimens of fulvicorne the head and pronotum are generally darker than the elytra. Aedeagi are characteristic, that of nitidus, along with a key is given by Mendel (1982).
A.nitidus would seem to be a very local insect; it has been reared from a fallen, dead field maple (Acer campestre) branch in Windsor Great park, Berks, and a single specimen was beaten from Poplar (Populus canescens) in West Sussex (Mendel, ibid). It is common in central Europe and associated with various deciduous trees; Chestnut, lime, maple are quoted (Lohse, 1969)
Lohse, G.A. 1969 Anobiidae in Freude, Harde and Lohse, Die kafer Mitteleuropas, 8:46
Mendel, H. 1982. Hemicoelus nitidus new to Britain.Ent.Mon.Mag 118:253-254