Cheiracanthium torsivum
{{Short description|Species of spider}}
{{refimprove|date=May 2025}}
{{Speciesbox
| genus = Cheiracanthium
| species = torsivum
| authority = Chen et Huang, 2012
}}
Cheiracanthium torsivum, commonly known in Mandarin Chinese as "旋距紅螯蛛" or Twisted spur red chelate spider, is a species of yellow sac spider endemic to Taiwan. {{cite book |last1=Chen |first1=Shyh-hwang |last2=Huang |first2=Wen-Jean |title=The Spider Fauna of Taiwan |date=May 2012 |publisher=National Taiwan Normal University |isbn=9789577526687 |page=28-30 }}
Description
C. torsivum have a yellowish-brown carapace and yellow abdomen. {{cite book |last1=Chen |first1=Shyh-hwang |last2=Huang |first2=Wen-Jean |title=The Spider Fauna of Taiwan |date=May 2012 |publisher=National Taiwan Normal University |isbn=9789577526687 |page=28-30 }} Their abdomen has a pale grayish brown cardiac pattern. They are distinguished from similar species by the shape of the male's pedipalps; the palpal bulb sports a spiniform apophysis and distally-intorted cymbial spur. Females are distinguished from those of other species by dark, globular markings that can be seen through the tegument of the epigynum.
Distribution
C. torsivum is found in northern and southeastern Taiwan at elevations between 500m and 1800m.{{cite book |last1=Chen |first1=Shyh-hwang |last2=Huang |first2=Wen-Jean |title=The Spider Fauna of Taiwan |date=May 2012 |publisher=National Taiwan Normal University |isbn=9789577526687 |page=28-30 }}
Etymology
"Torsivum," from the species name Cheiracanthium torsivum, means "spiral-twisted" and refers to the spiriform cymbial spur on the male's pedipalp.{{cite book |last1=Chen |first1=Shyh-hwang |last2=Huang |first2=Wen-Jean |title=The Spider Fauna of Taiwan |date=May 2012 |publisher=National Taiwan Normal University |isbn=9789577526687 |page=28-30 }}