About this tool

About the fact sheets

Taxonomy: Includes the current valid scientific name with authority and the family. Common names are given only if they are included on the official common names list approved by the American Arachnological Society. Commonly encountered synonyms are included when they may be encountered in the literature. Finally, some additional taxonomical information may be provided that may help reduce conflicting or confusing information from the literature.

Description: Includes the body lengths of mature males and females, along with an indication of how spiderlings may differ in appearance from adult. Descriptions of the egg sacs are also given where relevant and available.

Recognition and diagnostic features: A brief indication of features that distinguish the spider from other similar species.

Related or similar species: A list of species that may look similar.

Distribution: Indicates the range of the spider in California and outside California, as well as nativity information.

Biology: A brief description of the biology and life history of the species is given.

Status in table grapes: Includes the level of incidence of the species in table grapes, regulation information for New Zealand and Australia as of the end of 2011, as well as an indication of the level of medical importance of the species.

Selected references: A list of selected references for the species.

Images: A number of images are provided for each species. The number of images provided will vary based on the species. Species that are more variable in coloration or are more difficult to identify will have more images. Generally, the provided images include live males and females, immatures if they differ in appearance from the adults and they were able to be collected, diagnostic images of the spider where appropriate, genitalia for both sexes, and egg sacs when available. Because live specimens were not available for all species, in some cases, images of preserved specimens may be provided instead.

Although genitalic examination in spiders can be difficult, it can offer the ability to make species identifications with greater certainty. Diagnostic images of male pedipalps are provided; this is generally the ventral and lateral views of the left palp, but sometimes it will be only one of these, or it may be the medial view. Because dissecting female spider genitalia is quite difficult, only the non-dissected external view is presented and is all that should be needed to differentiate species in this tool.