- Belidae
__NOTOC__Taxobox
name = Belidae
image_width = 250px
image_caption = Rhinotia hemistictus
regnum =Animal ia
phylum =Arthropod a
subphylum =Hexapoda
classis =Insect a
subclassis =Pterygota
infraclassis =Neoptera
superordo =Endopterygota
ordo = Coleoptera
subordo =Polyphaga
infraordo =Cucujiformia
superfamilia =Curculionoidea
familia = Belidae
familia_authority = Schönherr, 1826
subdivision_ranks = Subfamilies
subdivision =Belinae Oxycoryninae and see textBelidae is a family of weevils, called belids or primitive weevils because they have straight antennae, unlike the "true weevils" or
Curculionidae which have elbowed antennae. They are sometimes known as "cycad weevils", but this properly refers to a few species from thegenera "Parallocorynus " and "Rhopalotria ". InFlorida , "the cycad weevil" is usually "Rhopalotria slossoni ", the onlyVerify source|date=June 2008species native toNorth America .Distribution
The Belidae today have an essentially
Gondwana n distribution, occurring only in theAustralia -New Guinea -New Zealand region up toSoutheast Asia , South andCentral America (barely reachingNorth America ), somePacific islands (notably theHawaiian Islands ) and a few places inAfrica . Many lineages of belids are notable for their highlyrelict ual distribution; for example theAglycyderini are found in two areas on opposite sides of the Earth, with no such beetles known from anywhere in betweenMarvaldi "et al." (2006)] .Belids were more widespread during the
Late Jurassic toEarly Cretaceous , about 161-100million years ago , when they were found at least inCentral Asia ,Spain andBrazil Ming "et al." (2006)] .Paleogene species belonging to still-living tribes are known fromEurope andNorth America .Description
Members of the subfamily
Belinae are typically elongated and cylindrical. Some belines resemble other weevils, like the genus "Lixus " of the true weevil family (Curculionidae ), or brentids. Others are mimetic and less closely relatedPolyphaga beetles such asLycidae orPyrochroidae .The adults are distinguished from other ancient weevil lineages by some characteristic traits: The fore tibia of belines is unusual in that it has a comb of bristles (
seta e) in anapical groove opposite the tarsal articulation; this is uised for grooming.Microscopic ally, thespermatheca l gland is several times longer than thespermathecal capsule . Most also have only a few (4 or less) setae on eachmandible (more inAglycyderini ), and thepronotum is constricted at the tip (not in "Oxycorynus ", "Parallocorynus " and "Rhopalotria ").The
larva e lack lines on the "forehead"; their head is attached to theprothorax with heavy muscles, withdrawing it into the thorax and creating a robust structure which allows the larvae to chew their though food. Theendocarina is V-shaped. In most, the antennae have a retractable membrane at the base (not in "Parallocorynus " and "Rhopalotria "), and thealimentary canal has caeca distributed all over at random (in two clean bundles inAglycyderini andMetrioxenini ).Ecology
Adults usually eat
pollen ; thelarva e feed on the wood of diseased or dying plants or on deadwood,flower bud s or fruits. Though they may appear to be pests because of their association with plants dying off, belids tend to avoid healthy plants. They may occur as a secondary complication in plants already affected by some pest or disease however. But altogether, belids (as opposed to many other weevils) are normally harmless and can be beneficial, the adults aspollinator s and the larvae asindicator species for bad condition of their host plants. InFlorida for example, "Rhopalotria slossoni " is important in maintaining populations of the rareCoontie ("Zamia pumila").The original host plants of belids were probably
Araucariaceae ,conifer s which were extremely common during the time when the family evolved. Some moderngenera also feed onangiosperm s, usually rather old groups likeBalanophoraceae ,Myrtaceae orVitaceae , oncycad s, or onpalm s. The Pacific genus "Proterhinus " has undergone a vigorousadaptive radiation on theHawaiian Islands andevolve d to utilize a wide range of the limited diversity of plants found there.ystematics
The
subfamilies have each, at various times, been considered as separate families, but they are grouped together in most recent classifications. There are three living main lineages, variously considered three or, as here, two subfamilies, with the tribeAglycyderini sometimes considered a distinct subfamily. Other classifications treat theOxycorynidae as distinct family. A prehistoric subfamily only known fromMesozoic fossil s are theEobelinae . [Marvaldi "et al." (2006), Ming "et al." (2006)]Gallery
Footnotes
References
* (2006): Phylogeny of the Oxycoryninae sensu lato (Coleoptera: Belidae) and evolution of host-plant associations. "Invertebrate Systematics" 20: 447–476. doi|10.1071/IS05059 (HTML abstract)
* (2006): A new fossil weevil (Coleoptera, Curculionoidea, Belidae) from the Yixian Formation of western Liaoning, China. "Progress in Natural Science" 16 (8): 885-888. doi|10.1080/10020070612330084 (HTML abstract)External links
* http://www.geocities.com/brisbane_weevils/BELIDAE.htm
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