Cydnidae Temporal range: [1] | |
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Cydnus aterrimus Type genus for the family | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Hemiptera |
Suborder: | Heteroptera |
Superfamily: | Pentatomoidea |
Family: | Cydnidae Billberg, 1820 |
Cydnidae are a family of pentatomoid bugs, known by common names including burrowing bugs or burrower bugs. [2] As the common name would suggest, many members of the group live a subterranean lifestyle, burrowing into soil using their head and forelegs, only emerging to mate and then laying their eggs in soil. Other members of the group are not burrowers, and live above the soil layer, often in close association with plants. Several species are known as agricultural pests. [3]
Burrowing bugs range from 2 to 20 mm in length. [4] They are dark, ovoid in shape and highly sclerotised. The head is generally subquadrate to semicircular in shape, and has a pair of 5-segmented antennae. The coxae of the legs have setal combs, while the apices of the mid and hind coxae are fringed with rigid setae. The tibiae of the legs (also often the head and pronotum) have spines. The tarsi of the legs are 3-segmented and often reduced. [5]
Similar to other pentatomoids, Cydnidae have glands in the thorax (adults) or the lateral part of the abdomen (nymphs) that secrete a foul-smelling mix of chemicals for defense against predators. [6]
Cydnidae in subfamilies Cydninae and Cephalocteinae live mostly in soil and feed on roots of plants. Those in subfamilies Parastrachinae, Sehirinae and Thyreocorinae instead live on aboveground parts of plants. Adults are attracted to light and sometimes in large numbers. [5]
Cydnidae feed on sap from phloem, unlike other heteropterans. [4]
As of 2003, there were 27 cydnid species reported as crop pests and six that feed on peanut. Of the peanut-feeding species, Pangaeus bilineatus is the most abundant and the only one associated with feeding injury to peanut kernels. [7]
Another pest is Fromundus pygmaeus, which attacks rice seedlings, sugarcane, fallen seeds of grasses and roots of soybean and clover. [8]
Some cydnids are medically important. The aforementioned F.pygmaeus facultatively sucks blood from humans, [8] while Chilocoris assmuthi can cause brown lesions on skin (usually on the feet) with its defensive secretions. [6]
BioLib includes the following subfamilies:
In some older classifications, Cydnidae sensu lato includes the subfamily Thyreocorinae (now a separate family, Thyreocoridae), which are known commonly as "negro bugs" or "ebony bugs", and/or the families Thaumastellidae and Parastrachiidae. [9] [10]
The Cupedidae are a small family of beetles, notable for the square pattern of "windows" on their elytra, which give the family their common name of reticulated beetles.
The Pentatomoidea are a superfamily of insects in the suborder Heteroptera of the order Hemiptera. As hemipterans, they possess a common arrangement of sucking mouthparts. The roughly 7000 species under Pentatomoidea are divided into 21 families. Among these are the stink bugs and shield bugs, jewel bugs, giant shield bugs, and burrower bugs.
Hybosoridae, sometimes known as the scavenger scarab beetles, is a family of scarabaeiform beetles. The 690 species in 97 genera occur widely in the tropics, but little is known of their biology.
Mantispidae, known commonly as mantidflies, mantispids, mantid lacewings, mantisflies or mantis-flies, is a family of small to moderate-sized insects in the order Neuroptera. There are many genera with around 400 species worldwide, especially in the tropics and subtropics. Only five species of Mantispa occur in Europe. As their names suggest, members of the group possess raptorial forelimbs similar to those of the praying mantis, a case of convergent evolution.
Pelecinidae is a family of parasitic wasps in the superfamily Proctotrupoidea. It contains only one living genus, Pelecinus, with three species known from the Americas. The earliest fossil species are known from the Jurassic, and the group was highly diverse during the Cretaceous. Members of Pelecinus are parasitic on larval beetles, flies, green lacewings, and sawflies.
Taeniopterygidae are a family of stone flies with about 110 described extant species. They are commonly called willowflies or winter stoneflies and have a holarctic distribution. Adults are usually smaller than 15 mm.
Nemonychidae is a small family of weevils, placed within the primitive weevil group because they have straight rather than geniculate (elbowed) antennae. They are often called pine flower weevils. As in the Anthribidae, the labrum appears as a separate segment to the clypeus, and the maxillary palps are long and projecting. Nemonychidae have all ventrites free, while Anthribidae have ventrites 1-4 connate or partially fused. Nemonychidae lack lateral carinae on the pronotum, while these are usually present, though may be short, in Anthribidae.
The Berothidae are a family of winged insects of the order Neuroptera. They are known commonly as the beaded lacewings. The family was first named by Anton Handlirsch in 1906. The family consists of 24 genera and 110 living species distributed discontinuously worldwide, mostly in tropical and subtropical regions. Numerous extinct species have also been described. Their ecology is poorly known, but in the species where larval stages have been documented, the larvae are predators of termites.
Nymphidae, sometimes called split-footed lacewings, are a family of winged insects of the order Neuroptera. There are 35 extant species native to Australia and New Guinea.
Mesoraphidiidae is an extinct family of snakeflies in the suborder Raphidiomorpha. The family lived from the Late Jurassic through the Late Cretaceous and is known from twenty-five genera. Mesoraphidiids have been found as both compression fossils and as inclusions in amber. The family was first proposed in 1925 by the Russian paleoentomologist Andrey Vasilyevich Martynov based on Upper Jurassic fossils recovered in Kazakhstan. The family was expanded in 2002 by the synonymizing of several other proposed snakefly families. The family was divided into three subfamilies and one tribe in a 2011 paper, further clarifying the relationships of the included genera.
Sehirinae is a subfamily of burrowing bugs belonging to the family Cydnidae.
Chresmoda is an extinct genus of insects within the family Chresmodidae.
Cydninae is a subfamily of burrowing bugs in the family Cydnidae. There are about 11 genera and at least 40 described species in Cydninae.
Heloridae is a family of parasitic wasps in the superfamily Proctotrupoidea, known primarily from fossils, and only one extant genus, Helorus, with 12 species found worldwide. Members of Helorus are parasitic on green lacewings.
Proctotrupidae is a family of parasitic wasps in the superfamily Proctotrupoidea. There are about 400 species in more than 30 genera in Proctotrupidae, found throughout most of the world.
Mesoveliidae is a family of water treaders in the order Hemiptera. There are about 16 genera and at least 50 described species in Mesoveliidae.
The Progonocimicidae are an extinct family of true bugs in the suborder Coleorrhyncha. Progonocimicidae fossils have been found in Europe, Asia, Australia, and South America.
Yuripopovinidae is an extinct family of Coreoidea Hemipteran true bugs. Member species are known from the Early Cretaceous and early Late Cretaceous of Asia and northern Gondwana. Among the distinguishing characters are "the hemelytral costal vein apically much thickened and pterostigma-like, the corium with two large cells separated by one longitudinal straight vein." Dehiscensicoridae, described from the Yixian Formation of China has been deemed a junior synonym of Yuripopovinidae per Du et al. (2019). The family was named after Russian paleoentomologist Yuri Alexandrovich Popov.
Eremochaetidae is an extinct family of brachyceran flies known from the Jurassic and Cretaceous periods of Asia. It is part of the extinct superfamily Archisargoidea. The morphology of the ovipositor of the only 3 dimensionally preserved genus Zhenia was initially interpreted as evidence of being an endoparasitoid of arthropods, however a subsequent study suggested that the ovipositor was used to deposit its eggs in plant material, similar to members of Tephritoidea. In a phylogenetic analysis, Ermochaetidae was found to be monophyletic, surrounded by a paraphyletic Archisargidae.
Angarosphecidae is an extinct family of Mesozoic and early Cenozoic wasps in the superfamily Apoidea.
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