
1) Arthropod genus 2) Cosmopolitan spider 3) Genus latrodectus 4) Venomous spiders
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https://www.crosswordclues.com/clue/latrodectus

Latrodectus is a genus of spider in the family Theridiidae, many of which are commonly known as widow spiders. The genus contains 32 recognized species distributed worldwide, including the North American black widows (L. mactans, L. hesperus, and L. variolus), the button spiders of Africa, and the Australian redback. Individual species vary widely...
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http://en.wikipedia.org/wiki/Latrodectus

A genus of relatively small spiders, the widow spiders, capable of inflicting highly poisonous, neurotoxic, painful bites; they are responsible, along with Loxosceles (the brown spider), for most of the severe reactions from spider envenomation. Medically important species are known from Australia, North and South America, South Africa, and New Zea...
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(lat″ro-dek´tәs) a genus of poisonous spiders. L. mac´tans is the black widow spider, a North American species whose bite may cause severe symptoms or even death.
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Genus of spiders, Black Widows. See alpha-latrotoxin.
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Type: Term Pronunciation: lat′rō-dek′tŭs Definitions: 1. A genus of relatively small spiders, the widow spiders, capable of inflicting highly poisonous, neurotoxic, painful bites; they are responsible, along with Loxosceles species (the brown spiders), for most of the severe reactions from spider envenomation. Medically import...
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http://www.medilexicon.com/medicaldictionary.php?t=48103

[
n] - venomous spiders
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http://www.webdictionary.co.uk/definition.php?query=Latrodectus
genus Latrodectus noun venomous spiders
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https://www.encyclo.co.uk/local/20974
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