Anasaitis milesae

Last updated

Anasaitis milesae
Anasaitis milesae Penryn.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Salticidae
Subfamily: Salticinae
Genus: Anasaitis
Species:
A. milesae
Binomial name
Anasaitis milesae
Logunov, 2024 [1]

Anasaitis milesae is a species of jumping spider (family Salticidae) that was first discovered in 2023 and formally described in 2024. [1] [2] It represents one of around 50 non-native spider species that have become established in Britain, likely facilitated by global warming providing an increasingly hospitable climate. [3]

Contents

History and systematics

The species was discovered by Tylan Berry during a "bioblitz" on the Penryn campus in Cornwall, England, home to the University of Exeter and Falmouth University. Immature and female spiders were first collected on 29 April 2023, adult males on 17 May 2023. It was confirmed as a new species and named by Russian arachnologist Dmitri Logunov of the Zoological Institute of the Russian Academy of Sciences. [3] The specific name milesae honours Claire Miles (1958–2023), a former honorary curator at the Manchester Museum where the holotype is kept. [2]

Logunov provisionally assigned the species to the genus Anasaitis , based on the diagnostic features of the genitalia of the two sexes. It most resembled three Anasaitis species from the Greater Antilles: A. emertoni , A. peckhami , and A. squamata . However, there were differences from other Anasaitis species, including less differentiation in body colour between males and females. [2]

Description

The spider measures about 3-4 mm in length and has distinctive furry tiger-type brown and cream markings. [3] The holotype male has a carapace about 1.5 mm long by 1.0 mm wide and an abdomen about 1.35 mm long by 0.9 mm wide. The first leg is the longest at about 2.6 mm. The overall base colour of the male is yellowish, with brown markings, including a W-shaped central brown mark on the top of the abdomen accompanied by brown spots, and brown lines and rings on the legs. Its palpal bulb has a relatively long tibial apophysis with a small tooth-like bump at the base. The paratype female is larger, with a carapace about 1.6 mm long by 1.1 mm wide and an abdomen about 1.9 mm long and 1.25 mm wide. The fourth leg is the longest at about 2.9 mm. The female is a similar colour to the male, but paler; the first pair of legs are entirely yellow rather than having partially brown sides. [2]

Distribution

Its nearest known relatives are found in the Caribbean region, suggesting that A. milesae likely arrived in Britain from distant tropical or subtropical regions through international trade and travel. [3]

Related Research Articles

<i>Aelurillus kopetdaghi</i> Species of spider

Aelurillus kopetdaghi is a species of jumping spider in the genus Aelurillus that lives in Turkmenistan. It was first described in 1996 by Wanda Wesołowska. The species is dark brown and medium-sized, with a bristly carapace that is between 3.4 and 3.5 mm long and a hairy abdomen that is between 3.2 and 4.1 mm long. The female is larger than the male. They also differ in details, such as the colour of the pedipalps, which are orange and brown respectively. The copulatory organs of the female are superficially similar to other species in the genus, like Aelurillus v-insignitus, but the internal structure is more complex.

Mogrus mirabilis is a species of jumping spider in the genus Mogrus that has been found in Egypt, Iraq, Jordan, Saudi Arabia, Sudan and Yemen. The spider was first defined in 1994 by Wanda Wesołowska and Anthony Van Harten. The female has a dark brown carapace that is typically 3.0 mm (0.12 in) and a greyish-white abdomen that is typically 4.7 mm (0.19 in) long. The male is significantly smaller and lighter, with a brownish-yellow carapace that is typically 2.38 mm (0.094 in) long and a yellow abdomen typically 2.5 mm (0.098 in) long. The male is similar to Mogrus antoninus, Mogrus frontosus and Mogrus logunovi, differing in the structure of its copulatory organs, particularly its bent tibial apophysis. The female is almost indistinguishable from Mogrus fulvovittatus, differing only in the structure of the epigyne. It is so similar to Mogrus sinaicus that Dmitri Logunov speculated that the two are the same species, although they have not been formally declared to be synonyms.

<i>Chalcoscirtus lepidus</i> Species of spider

Chalcoscirtus lepidus is a species of jumping spider in the genus Chalcoscirtus that has been found in Afghanistan, Iran, Tajikistan,Turkmenistan and Uzbekistan. The spider was first described in 1996 by Wanda Wesołowska, although the first male was identified three years later. The spider is small, with a carapace between 1.06 and 1.2 mm long and an abdomen between 1.03 and 2.2 mm long. The female is larger and lighter than the male and has three narrower stripes on the back while the male has a large scutum. In both cases, the carapace is plain. The scutum and lack of pattern on the carapace help distinguish the spider from related species. It can also be identified by its copulatory organs, particularly the long curved embolus on the male and the position of the copulatory openings on the female epigyne, which differ from the otherwise similar Chalcoscirtus infimus.

<i>Pseudomogrus mirandus</i> Species of spider

Pseudomogrus mirandus is a species of jumping spider in the genus Pseudomogrus. It has been found in Turkmenistan on the steppe, although it may also live in Afghanistan and Iran. The species was first defined by Wanda Wesołowska in 1991, one of over 500 described by the arachnologist. She originally placed it in the genus Yllenus, but was moved to the new genus Logunyllus in 2016, and then to its present designation in 2019. The spider is small, with a carapace measuring between 1.6 and 1.78 mm long and an abdomen between 1.4 and 2.3 mm long. The male has a red-brown or dark brown carapace and dark grey abdomen, the female a brown carapace and greyish-brown abdomen. All have a covering of small white scales. The spider has yellow legs. The copulatory organs are distinctive and enable the spider to be distinguished from others in the genus. The female epigyne has a half-moon-shaped pocket and simple insemination ducts that lead to spherical spermathecae. The male lacks the ventral tibial apophysis common in other species and has a compound terminal apophysis that is of a similar length to its thin embolus.

<i>Afraflacilla arabica</i> Species of spider

Afraflacilla arabica is a species of jumping spider in the genus Afraflacilla that lives in Afghanistan, Iran and Yemen. The spider was first described in 1994 by Wanda Wesołowska and Antonius van Harten. The spider is small to medium-sized, with an elongated brown carapace that is between 1.7 and 1.85 long and an oval greyish-brown abdomen between 2.25 and 3.0 mm long. The female and male are similar externally, differing mainly in the male's larger and thicker brown front legs that mount stridulatory apparatus. The remainder of the legs are smaller and yellow. The female is also slightly lighter. The spiders have distinctive copulatory organs. The male has a long embolus extending around the palpal bulb. The female has wide insemination ducts, small spermathecae and large accessory glands.

<i>Langelurillus furcatus</i> Species of spider

Langelurillus furcatus is a species of jumping spider in the genus Langelurillus that lives in Kenya and Tanzania. It was first described in 2000 by Wanda Wesołowska and Anthony Russell-Smith. The spider is small, with a carapace that is between 1.8 and 2.4 mm long and an abdomen between 1.7 and 2.7 mm long. The male is smaller than the female. It has a dark brown carapace, although the female is lighter, that has no markings. The female abdomen is dark russet with a pattern of black and white patches and the male abdomen is dark fawn with an indistinct light pattern. It has orange legs with dark patches, the female also having dark rings on its legs. The spider is similar to other related species, particularly Langelurillus alboguttatus, but can be distinguished by its two tibial apophysis, which make a V-shape. The epigyne has a deep depression that is plugged with a waxy secretion.

Neaetha irreperta is a species of jumping spider in the genus Neaetha that lives in South Africa and Tanzania. First described in 2000 by Wanda Wesołowska & Anthony Russell-Smith, the spider is small, with a dark brown carapace that is between 1.2 and 1.4 mm long and a deep red-brown abdomen between 1.1 and 1.5 mm long. The abdomen has a pattern that is indistinct on the male, but a clearer set of grey lines and marks on the female, and this, along with the width of the abdomen, distinguishes the species from other in the genus. The male has a long embolus and the female's sclerotized epigyne has a central pocket and wide copulatory openings.

<i>Stenaelurillus fuscatus</i> Species of spider

Stenaelurillus fuscatus is a species of jumping spider in the genus Stenaelurillus that lives in Kenya and Tanzania. The species was first identified in 2000 by Wanda Wesołowska & Anthony Russell-Smith, and named for the Latin word for darkish. The spider is medium-sized with a carapace between 2.5 and 3.2 mm long and an abdomen that is between 2.8 and 3.6 in in length. The female carapace is dark brown and has two white stripes and a pattern of a triangle and spots on the abdomen. The colouration is similarly dark but the patterns are less clear. The male abdomen is dominated by a dark scutum. The female is also darker overall, with brown rather than the yellow spinnerets and light brown chelicerae of the male. The male has a hook near the base of the embolus that differentiates it from other species in the genus, while the female's wide insemination ducts sets it apart from the similar Stenaelurillus darwini.

<i>Stenaelurillus mirabilis</i> Species of spider

Stenaelurillus mirabilis is a species of jumping spider in the genus Stenaelurillus that lives in Kenya and Tanzania. It was first described in 2000 by Wanda Wesołowska and Anthony Russell-Smith. The spider is medium-sized, with a dark brown carapace between 1.75 and 2.7 mm in length that has two white stripes across its length and a black abdomen between 1.9 and 2.8 mm long. The female abdomen has orange sides and a white marking of a single stripe interrupted by other marks. The male abdomen has a white cross shape formed of five spors. It is distinguished from other members of the genus by the male's long, thin palpal bulb and the female's epigyne with its short and slightly bent insemination ducts.

<i>Stenaelurillus latibulbis</i> Species of spider

Stenaelurillus latibulbis is a species of jumping spider in the genus Stenaelurillus that lives in Democratic Republic of the Congo and Zambia. It was first described in 2014 by Wanda Wesołowska. The spider is medium-sized, with a dark brown cephalothorax between 2.6 and 3.0 mm in length and a black abdomen between 1.9 and 3.4 mm long. The male carapace has patches of white hairs, while the female is marked by two white stripes that stretch from the front to back. The female abdomen has a triangular-shaped white marking. It is distinguished from other members of the genus by the male's short, wide palpal bulb and the female's small epigyne with relatively short insemination ducts and round spermathecae.

<i>Stenaelurillus zambiensis</i> Species of spider

Stenaelurillus zambiensis is a species of jumping spider in the genus Stenaelurillus that lives in Malawi, Zambia and Zimbabwe. It was first described in 2014 by Wanda Wesołowska. The spider is small, the male being smaller than the female, with a brown carapace between 2.6 and 3.2 mm in length and black-brown abdomen between 2.6 and 3.0 mm in length. The male has a distinctive metallic sheen on its abdomen and eye field. The male carapace is marked with two white streaks while the female has white stripes. It is distinguished from other members of the genus by the male's hook-shaped end to the embolus and the two depressions in the female epigyne.

<i>Stenaelurillus guttiger</i> Species of spider

Stenaelurillus guttiger is a species of jumping spider in the genus Stenaelurillus that is native to southern Africa. It was first described in 1901 by Eugène Simon based on examples found in South Africa, and subsequently also identified in Botswana, Mozambique and Zimbabwe. Initially allocated to the genus Aelurillus, the species was moved to its current genus in 1974. The spider is medium-sized, with a carapace that is between 2.0 and 2.75 mm long and an abdomen that is between 1.8 and 2.9 mm long. It is dark brown or brown, and has a pattern of white hairs on both the abdomen and carapace and a pattern of two stripes on the carapace. The abdomen has a white pattern of straight and V-shaped stripes and spots which varies between specimens. The colouring of the clypeus and legs can also range from yellow to dark brown depending on the particular example. It is distinguished from other species in the genus by the design of its sexual organs. The male has an embolus that is short and crab like. The female has a flat plate epigyne with widely separated copulatory openings and insemination ducts and a deep narrow pocket. Stenaelurillusguttiger feeds on termites, particularly Macrotermes and Odontotermes.

<i>Stenaelurillus jocquei</i> Species of spider

Stenaelurillus jocquei is a species of jumping spider in the genus Stenaelurillus that lives in Cameroon. It was first described in 2018 by Dmitri Logunov and Galina Azarkina. The spider is medium-sized, with a carapace between 2.6 and 2.7 mm long and abdomen between 12.4 and 3.5 mm long. The female is slightly larger than the male. The colouration differs between examples, which have been termed the light form and dark form. The carapace is brown and has two white stripes and the abdomen is brown with three white spots and three white stripes, the abdomen being darker in the dark form. The clypeus is yellowish brown in the light form and brown in the dark form. The male light form has iridenscent hairs on the clypeus and its brown eye field. The spinnerets of the female light form are yellow, the male brown and the dark form darker still. The species can be best distinguished from the similar Stenaelurillus hirsutus by its copulatory organs. The male has a ribbon-like spiralling embolus and the female has large round spermathecae.

<i>Stenaelurillus bandama</i> Species of spider

Stenaelurillus bandama is a species of jumping spider in the genus Stenaelurillus that lives in Ivory Coast. Named after the country where it was first found, it was first described in 2018 by Dmitri Logunov and Galina Azarkina. The spider is small, with a carapace between 2.45 and 2.55 mm long and abdomen between 2.4 and 3.1 mm long, although the female is larger than the male. They also differ in colouration. The male carapace is brown and has two white stripes unlike the female's yellow carapace. The male abdomen is dark brown has a pattern of spots and stripes while the female is lighter brown and has a single spot and speckles. The clypeus and legs are also brownish-yellow on the male and yellow on the female. It is similar to Stenaelurillus hirsutus, Stenaelurillus iubatus and Stenaelurillus striolatus but can be distinguished by the lack of hair and presence of a wider vertical stripe on the clypeus, the male's narrow embolus and the female's elongated pocket in the epigyne.

<i>Stenaelurillus senegalensis</i> Species of spider

Stenaelurillus senegalensis is a species of jumping spider in the genus Stenaelurillus that lives in Senegal. Named after the country where it was first found, it was first described in 2018 by Dmitri Logunov and Galina Azarkina. The spider is small, with a carapace between 1.7 and 2.5 mm long and abdomen between 1.6 and 3.45 mm long, although the female is larger than the male. The carapace is hairy, brown and has two white stripes. The abdomen differs between the male and female. The male has a pattern of yellow spots and a brown stripe. The female has a cross of yellow stripe and two brown stripes. The male has a bulging palpal bulb while the female has a flat epigyne with widely separated and backward-facing copulatory openings. It is similar to Stenaelurillus nigricaudus, also found in the country, but can be distinguished by the design of its long straight embolus and the lack of pockets in the epigyne.

<i>Stenaelurillus siyamae</i> Species of spider

Stenaelurillus siyamae is a species of jumping spider in the genus Stenaelurillus that lives in Sudan. It was first described in 2018 by Dmitri Logunov and Galina Azarkina from a holotype specimen found by a collector named Siyam in the Dinder National Park. The species takes its name from the collector. Only the female has been identified. The spider is small, with a carapace 2 mm (0.079 in) long and an abdomen 2.3 mm (0.091 in) long. The carapace is hairy, brown and has four white streaks, two made of scales on the body and two made of hairs on the edges, while the abdomen is a mixture of grey, brown and yellow with two large brown stripes flanking a thinner white stripe, all made of hairs. It is similar to Stenaelurillus sudanicus also found in the country but can be distinguished by the design of the epigyne, which is oval, its widely separated facing copulatory openings, and long, S-shaped insemination ducts.

<i>Aelurillus basseleti</i> Species of spider

Aelurillus basseleti is a species of jumping spider in the genus Aelurillus that has been found in Algeria, Morocco and Tunisia. Originally named Salticus basseleti, the spider was first identified in 1846 by Hippolyte Lucas, but the original male holotype has been lost. The female was first described in 2006. The spider is small and hard to distinguish from the related species Aelurillus luctuosus and Aelurillus monardi. The dark brown carapace is typically between 2.8 and 3.4 mm long and the grey-yellow abdomen is between 2.3 and 4 mm long, the female being larger than the male. The carapace has a single stripe down the middle. While the female is hard to distinguish compared to others in the genus, the male spider has distinctive white or tawny bands on the clypeus. The male has a curved embolus that is sufficiently varied between individual spiders that it is not sufficiently specific to identify the species.

<i>Aelurillus hirtipes</i> Species of spider

Aelurillus hirtipes, synonym Aelurillus sinaicus, is a species of jumping spider in the genus Aelurillus that lives in North Africa. First identified by Jacques Denis in Chad in 1960 as part of the Missions Berliet-Ténéré, it has also been found in Algeria, Egypt and Morocco. The spider is small, with a brown carapace that is between 3.5 and 3.6 mm long and a yellow abdomen that measures between 3 and 4 mm in length. The male has a small hooked embolus protruding from its palpal bulb and the female has S-shaped flaps on the epigyne and short copulatory ducts. The spider has a covering of light hairs, whiter on the female and more yellow on the male. These hairs help distinguish it from the related Aelurillus v-insignitus and Aelurillus plumipes

<i>Stenaelurillus nigricaudus</i> Species of spider

Stenaelurillus nigricaudus, synonyms Aelurillus sahariensis and Stenaelurillus nigritarsis, is the type species of the genus Stenaelurillus. It is a jumping spider that lives in Algeria, Burkina Faso, Gambia, Mali, Niger and Senegal. The male was first described by Eugène Simon in 1886 and the female initially in 1936 by Ludovico di Caporiacco and more thoroughly by Nikolaj Scharff and Tamás Szűts in 2005. It is a medium-sized spider with a cephalothorax between 2.4 and 2.7 mm and an abdomen that is between 2 and 3.7 in long. The carapace is reddish-brown and has two white or yellow stripes. The female abdomen has a pattern of stripes and spots, with some examples having brown spots inside yellow spots. The male abdomen has either a single dark stripe or two white and one brown stripes. While the female pedipalps are yellow, the male has either dark or brown pedipalps. The female has distinctive flanges at its copulatory openings. The male is distinguished by the shape of its palpal bulb and, particularly, of its hook-shaped embolus.

<i>Stenaelurillus wandae</i> Species of spider

Stenaelurillus wandae is a species of jumping spider in the genus Stenaelurillus that lives in India. It was first described in 2020 by Dmitri Logunov. The spider is medium-sized, with a carapace between 2.95 and 3.35 mm long and an abdomen between 2.8 and 3.5 mm long. The female is larger than the male. The colouration differs between them too, with the male having two white stripes on the carapace while the female has a pattern formed of brown and white scales. The chelicerae, clypeus, legs, pedipalps and spinnerets are generally yellow, although they may be yellow-brown on the male. The spider is distinguished from others in the area by the lack of a pocket in the epigyne of the female and the forked appendage, with different length tines, on the palpal bulb of the male.

References

  1. 1 2 "Taxon details Anasaitis milesae Logunov, 2024". World Spider Catalog. Natural History Museum Bern. Retrieved 2024-04-27.
  2. 1 2 3 4 Logunov, D. V. (2024). "Salticidae (Araneae) imported to the United Kingdom, with description of a new, non-native, species of Anasaitis Bryant, 1950". Arachnology. 19 (7): 1036–1042. doi:10.13156/arac.2024.19.7.1036.
  3. 1 2 3 4 "Exotic spiders flourishing in Britain as new jumping species found in Cornwall". The Guardian. 26 April 2024. Retrieved 2024-04-27.
    Barkham, Patrick (27 April 2024). "Exotic spiders thriving in UK due to global trade and a warmer climate". The Guardian. p. 29.