Coelioxys modestus
Smith, 1854
Modest Sharptail
Coelioxys modestus is a of solitary in the Megachilidae, commonly known as the Modest Sharptail. It is a cleptoparasitic bee that targets other Megachilidae, particularly leafcutter bees (Megachile). The species occurs in North America, with records from the northeastern United States including Vermont. Like other Coelioxys, females possess a distinctive pointed adapted for inserting into nests.
Pronunciation
How to pronounce Coelioxys modestus: /sɛː.liˈɔk.sɪs moˈdɛs.tus/
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Identification
Coelioxys modestus can be distinguished from other Coelioxys by subtle morphological features of the and punctation patterns. Females have the characteristic sharply pointed abdomen of the , used for -laying in nests. Males typically have multiple pointed projections on the abdomen. Identification to species level requires examination of microscopic features including the and arrangement of punctures on the and the shape of the sternites. Separation from the similar C. rufitarsis and C. sayi often depends on details of abdominal and coloration.
Distribution
North America; specifically recorded from Vermont, United States. The likely occurs more broadly in the northeastern United States and adjacent Canada, though precise range boundaries require further documentation.
Host Associations
- Megachile - of leafcutter bee nests; females deposit in where larvae consume the pollen provision intended for host offspring
Behavior
Females are active that locate nests of Megachile through chemical cues. They enter unsealed nest to deposit , typically while the host female is away foraging. The pointed abdominal apex allows precise egg placement among the host's pollen provision. Larvae are presumed to be facultatively predatory, consuming the host egg or larva before feeding on the stored pollen and nectar. Males are often observed patrolling nesting in search of females.
Ecological Role
Similar Taxa
- Coelioxys rufitarsisSimilar size and general appearance; distinguished by differences in abdominal punctation and tarsal coloration
- Coelioxys sayiOverlapping range and associations; separation requires detailed examination of abdominal and sternite
- Coelioxys octodentataSimilar pointed abdominal ; distinguished by number and arrangement of male abdominal teeth and female tergal punctation