''Langona mediocris'' is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

jumping spider Jumping spiders are a group of spiders that constitute the family (biology), family Salticidae. , this family contained over 600 species description, described genus, genera and over 6,000 described species, making it the largest family of spide ...

in the

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

Langona ''Langona'' is a genus of spiders in the family Salticidae (jumping spiders). ''Langona'' species are similar to those of the genus ''Aelurillus''. In 2015, it was listed in the subtribe Aelurillina. The subtribe is allocated to the Tribe (biolog ...

'' that lives in Zimbabwe. The male was first described by

Wanda Wesołowska Wanda Wesołowska (born 11 August 1950) is a Polish zoologist known for her work with jumping spiders. She has described more species of jumping spider than any contemporary writer, and is second only to Eugène Simon in the history of arachnolo ...

in 2000. The female has not been identified. The spider is large and brown-black with a

carapace A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the unde ...

between long and a

abdomen The abdomen (colloquially called the gut, belly, tummy, midriff, tucky, or stomach) is the front part of the torso between the thorax (chest) and pelvis in humans and in other vertebrates. The area occupied by the abdomen is called the abdominal ...

between . The carapace has two converging white stripes while the abdomen has a single stripe. The

legs A leg is a weight-bearing and locomotive anatomical structure, usually having a columnar shape. During locomotion, legs function as "extensible struts". The combination of movements at all joints can be modeled as a single, linear element cap ...

are orange and the

pedipalp Pedipalps (commonly shortened to palps or palpi) are the secondary pair of forward appendages among Chelicerata, chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to ...

s yellow. As is typical for the genus, the

chelicerae The chelicerae () are the arthropod mouthparts, mouthparts of the subphylum Chelicerata, an arthropod group that includes arachnids, horseshoe crabs, and sea spiders. Commonly referred to as "jaws", chelicerae may be shaped as either articulated ...

are toothless. The long, thin

embolus An embolus (; : emboli; from the Greek ἔμβολος "wedge", "plug") is an unattached mass that travels through the circulatory system, bloodstream and is capable of creating blockages. When an embolus Vascular occlusion, occludes a blood vess ...

is hidden within a pocket in the cymbium and has a spiralled tip. The male differs from the similar ''

Langona bitumorata ''Langona'' is a genus of spiders in the family Salticidae (jumping spiders). ''Langona'' species are similar to those of the genus '' Aelurillus''. In 2015, it was listed in the subtribe Aelurillina. The subtribe is allocated to the tribe Aelur ...

'' by the single bump on its

palpal bulb The two palpal bulbs – also known as palpal organs and genital bulbs – are the copulatory organs of a male spider. They are borne on the last segment of the pedipalps (the front "limbs" of a spider), giving the spider an appearance often descr ...

Taxonomy

''Langona mediocris'' is a

first described by the Polish

arachnologist Arachnology is the scientific study of arachnids, which comprise spiders and related invertebrates such as scorpions, pseudoscorpions, harvestmen, ticks, and mites. Those who study spiders and other arachnids are arachnologists. More narrowly ...

in 2000. It is one of over 500

she identified during her career. The species was placed by Wesołowska in the

'', first described by

Eugène Simon Eugène Louis Simon (; 30 April 1848 – 17 November 1924) was a French naturalist who worked particularly on insects and spiders, but also on birds and plants. He is by far the most prolific spider Taxonomy (biology), taxonomist in history, ...

in 1901. It was listed in the subtribe Aelurillina in the

tribe The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide use of the term in English is in the discipline of anthropology. The definition is contested, in part due to conflict ...

Aelurillini by

Wayne Maddison Wayne Paul Maddison (born 1958) is a Canadian evolutionary biologist, arachnologist, and biological illustrator. He is Canada Research Chair in Biodiversity and a professor at the departments of zoology and botany at the University of British ...

in 2015. These were allocated to the

clade In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...

Saltafresia. In 2017, the genus was grouped with nine other genera of jumping spiders under the name Aelurillines. It is particularly closely related to the genus ''

Aelurillus ''Aelurillus'' is a genus of spiders in the family Salticidae (jumping spiders). Description Species of the genus ''Aelurillus'' are typically about 7 mm long in females, and up to five mm in males. They are stout, squat-shaped and rather f ...

'', after which the subtribe, tribe and group are named. The different ''Langona'' species generally cannot be distinguished from each other or from other members of the group by either their colours or the patterns that appear on their bodies, but by the structure of the copulatory organs. The species is named for the

Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...

word for average.

Description

The spider is large and hairy. The male has an oval

that is between in length and in width. It is brown-black with two converging lines of white hairs running from the back of the eyes all the way to the end of the carapace. The eye field is large, covering one third of the length. The

is similar in colour with single stripes of white hair down the middle and a dense area of long hairs around the edge. The underside is yellow. It is between long and between wide. The

clypeus The clypeus is one of the sclerites that make up the face of an arthropod. In insects, the clypeus delimits the lower margin of the face, with the labrum articulated along the ventral margin of the clypeus. The mandibles bracket the labrum, but ...

is low and hairy. The

are orange and toothless with a hairy protrusion a bit like a moustache on the front. The

are orange and hairy. The

spinneret A spinneret is a silk-spinning organ of a spider or the larva of an insect. Some adult insects also have spinnerets, such as those borne on the forelegs of Embioptera. Spinnerets are usually on the underside of a spider's opisthosoma, and ar ...

s are brown and the

s yellow. The

is bulbous and has a thin and hairy appendage, or apophysis, on the tibia that is relatively long. The

is long and thin, and hidden within a pocket in the cymbium. Its tip looks like a spiral. The female has not been described. Like other ''Lagona'' spiders, the chelicerae are toothless. and there is a single apophysis on the pedipalp tibia, which enables it to be distinguished from other Aelurillinae. The male closely resembles the related ''

'', but can be distinguished by the single bump on the palpal bulb.

Distribution

''Langona mediocris'' is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to Zimbabwe. The

holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...

was found in 1990 in

Manicaland Manicaland is a province in eastern Zimbabwe. After Harare Province, it is the country's second-most populous province, with a population of 2.037 million, as of the 2022 census. Making it the third most densely populated province after Harare a ...

References

Citations

Bibliography

* * * * * * * {{Taxonbar, from=Q1907044 Endemic fauna of Zimbabwe Salticidae Spiders of Africa Taxa named by Wanda Wesołowska Spiders described in 2000