Sinea complexa

Caudell, 1900

Sinea complexa is a of assassin bug in the Reduviidae, first described by Caudell in 1900. It was long confused with the eastern species Sinea incognita, which was described as new in 2015 based on morphological differences in the front leg . The species occurs in western and southwestern North America and Mexico. Like other Sinea species, it is a predatory insect that likely feeds on other arthropods.

Journal of morphology (1912) (14761650946) by Internet Archive Book Images. Used under a No restrictions license.

Pronunciation

How to pronounce Sinea complexa: /ˈsaɪn.iə kəmˈplɛk.sə/

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Identification

Sinea complexa can be distinguished from its close relatives by the shape of the on its front leg: the femur is expanded at one end but not as dramatically as in Sinea incognita, giving it a baseball bat-like appearance rather than the caveman club shape of S. incognita. It differs from Sinea integra, whose femur is nearly uniform in width along its length (stickball bat shape). The has a 'thorny' appearance with prominent spines on the inner surface of the tibia on the front leg, a trait shared with other Sinea species but absent in the similar Acholla. Body length ranges from 12–14 mm.

Images

Distribution

Western and southwestern United States south into Mexico. Records include New Mexico and other western states. Previously thought to range eastward to Missouri and Illinois, but those are now recognized as the distinct Sinea incognita.

Behavior

Has been observed as a in urban and suburban landscapes, where it may be attracted to -infested trees that support prey . Observations indicate it may forage in shrubs beneath trees with high densities of scale insects.

Ecological Role

Predatory that contributes to natural enemy in urban landscapes. Its presence in shrubs below -infested trees suggests it may help regulate pest in managed landscapes.

Human Relevance

Contributes to of pest insects in urban and suburban environments. May be affected by broad-spectrum applications targeting scale insects on trees.

Similar Taxa

Sinea incognitaFormerly confused with S. complexa; distinguished by more dramatically expanded front (caveman club vs. baseball bat shape) and geographic separation (eastern US vs. western US)
Sinea integraOverlapping range in southwestern US and Mexico; distinguished by uniformly thick front (stickball bat shape) rather than expanded femur
Acholla spp.Similar size and general appearance; lacks prominent spines on inner surface of front tibia and has less 'thorny' overall appearance; averages slightly larger (12–16 mm vs. 12–14 mm)

More Details

Taxonomic history

For over 100 years, now recognized as Sinea incognita were misidentified as S. complexa. The was formally separated in 2015 based on morphological analysis of the front leg and geographic distribution.