Wallengren, 1869 or auctt. nec Wallengren, 1869
Phymatopus (Originally: Noctua Linnaeus, 1758) is a genus of moths belonging to the hepialidae family (commonly referred to as swift moths or ghost moths), which consists of around 500 species and 30 genera. They can be found across Eurasia and North America. Species can be distinguished by the different morphology of male genitalia and different forewing patterns, which vary in stripe colour and size and arrangement of spots. The stripes themselves consist of spots separated by dark veins which are fringed by thin black lines from both inner and outer sides.
- Food plant: Pteridium
Phymatopus auctt. nec Wallengren, 1869
- Phymatopus californicus - United States
- Phymatopus hectoides - United States
The genus Phymatopus is considered monotypic and species can be distinguished by forewing pattern and male genitalia. Phymatopus lack spurs on the tibiae and like other members of the Hepialidae family, also lack a proboscis or frenulum and have very short antennae.
The Gold Swift (Phymatopus hectus), originally belonging to the Hepialus genus, is widely distributed across Europe (Central and North) and the Ural mountains, follows the distribution of its foodplant- bracken and roots of Erica, Primula, Rumex, Calluna. The male forewings bear two silvery white stripes consisting of individual spots separated by dark veins, which are fringed with thin black lines. The dorsal process of valvella (part of male genitalia) is almost straight, and the mesosome tip is rounded.
Phymatopus hecta japonicus
Phymatopus hecta japonicus is found located in the Russian Far East: Sakhalin Island and Southern Kurils; south of the Daisetsu Mountains, Hokkaido, Japan. Its appearance is similar to P. hectus but differs in that the outer strip is usually uninterrupted. It consists of 4-5 silvery spots at the apex (anterior corner), 2-3 small spots moving slightly more inward and the largest one at the inner margin. The morphology of the male genitalia is also different to that of P. hectus, the ventral process of valvella is belt-like, which tapers to a point as it reaches the distal quarter, the dorsal margin of valva is convex. P. japonicus from Sakhalin has a maximum male wingspan of 25-26mm and shows pale or grayish brown colouring on the forewings, whereas the male specimens from Kurilan tend to have a larger wingspan of 30–31 mm- bright, reddish-brown in colour. The male genitalia also differs between specimens of Kurilian population and from Sakhalin, with Kurilian males having shorter mesosomes and a rounded tip of valva distal projection, as opposed to a tapering tip in Sakhalin males. .
Phymatopus hecticus is found in Eastern Russia. The forewing stripes are usually composed of golden-yellow or whitish coloured confluent spots without metallic luster. In male genitalia, the dorsal process of valvella is strongly curved in the distal part, giving it a hook-like appearance; there is also a clear cavity at the tip of the mesosome.
Phymatopus hecticus albomaculatus
Phymatopus hecticus albomaculatus is found in Eastern Russia, North of Primorskii krai. Both forewing stripes have a silvery white appearance, with a metallic tinge, similar into Phymatopus hectus and Phymatopus haponicus, also consisting of separated spots. However, they have differences in male genitalia; the shape of the eighth abdominal sternum and tip of mesosome. The length of forewing is about 14 mm in males, with a curved inner strip. The outer strip consists of 3 separated spots at the apex and 2 smaller spots moving inwards.
Western Asia, North America- north of Mexico, Central and North Europe. The Eurasian range consists solely of Phymatopus hectus, and in North America the genus is represented by three species, which are geographically restricted to the western coastal region of the United States.
Phymatopus are root and stem borers. It is not uncommon for the larvae to tunnel through the stems, as is the case of the western North American Phymatopus. Tunnels can be found travelling through the base of the stems and also the adjacent stems in contact with leaf litter and soil. Sometimes dead stems can also serve to provide tunnels which are active. As well as tunnelling through stems, some larvae (e.g. P. hectoides) tunnel through the soil and feed on root tissues.
In the pupae, one or two fixed basal abdominal segments. On the abdominal segments, there are dorsal spines aligned in rows, similar to some lower members of the Heteroneura
As in other lepidopterans, early prophase I stage of meiosis occurs as normal, but there is no crossing over or chiasma formation in the females at the prophase I stage. The males on the other hand show conventional meiotic recombination.
Host plants and food plants
- Pteridium (Bracken) Host plant
- Brooms (Baccharis)
- Woolly sunflower (Eriophyllum)
- Sneezeweed (Helenium)
- Lupins/ lupines (Lupinus)
- Apple trees (Malus)
- Roots of:
Mobility is defined as the ability to migrate. According to the metapopulation theory, migration is important for individuals to colonize new areas and recolonize old ones to avoid extinction. Moths, like other insects, are only mobile in the larval and adult stages. Mobility at the larval stage is limited and required mainly to find food and an optimal environment to pupate. According to van der Meulen and Groenendijk’s classification, Phymatopus exhibit area restricted, limited wandering behaviour and small flight range.
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- van der Meulen J & Groenendijk D (2005). "Assessment of the mobility of day-flying moths: an ecological approach". PROC. NETH. ENTOMOL. SOC. MEET 16: 37–50.