Xeralictus bicuspidariae
Xeralictus bicuspidariae is a rare in the Halictidae, discovered to play a central role in a floral mimicry system in the Sonoran Desert. The species is one of two rare Xeralictus bees involved in a pollination relationship with Mentzelia involucrata, a yellow-flowered plant in the family Loasaceae. Male bees patrol for females at these flowers, where they attempt to mate with females buried -first in the blossoms. This has been exploited by the orchid-like plant Mohavea confertiflora, which mimics both the appearance of Mentzelia flowers and the visual cue of a female bee , tricking males into attempting copulation and thereby transferring pollen.
Pronunciation
How to pronounce Xeralictus bicuspidariae: /zɛrəˈlɪktəs bɪskʌspɪˈdɛəriˌiː/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
The is distinguished from its Xeralictus timberlakei (found west of the Colorado River) by geographic distribution; X. bicuspidariae occurs east of the Colorado River in Arizona. Females have been observed with only the tip of the exposed when visiting Mentzelia flowers, a posture that exposes the dark abdominal tip amid the yellow anthers. The specific epithet "bicuspidariae" likely refers to characteristics of the female abdomen. Males are active patrollers that search for females at flowers.
Habitat
Desert environments of the Sonoran Desert, specifically associated with patches of Mentzelia involucrata and the co-occurring mimic Mohavea confertiflora. The type locality is the Kofa National Wildlife south of Quartzsite, Arizona.
Distribution
Eastern side of the Colorado River in Arizona, USA. The has a parapatric distribution with Xeralictus timberlakei, which occurs west of the Colorado River.
Seasonality
have been observed in March. Activity is tied to the blooming period of plants Mentzelia involucrata and Mohavea confertiflora.
Diet
Females collect pollen from Mentzelia involucrata flowers. Males do not collect pollen or nectar; their visits to flowers are solely for locating mates.
Host Associations
- Mentzelia involucrata - pollen Primary pollen source for females; females bury their in flowers to collect pollen, leaving exposed
- Mohavea confertiflora - deceived Mimic plant that exploits male mating for pollination without providing reward
Behavior
Females forage for pollen by inserting their deeply into Mentzelia flowers, a posture that leaves the tip exposed. Males patrol Mentzelia flowers to locate females in this vulnerable position and attempt to mount them for mating. Males have been observed diving into Mohavea confertiflora flowers in response to the dark central marking that resembles a female abdomen; during this attempted copulation, pollen is deposited on the male and carried to subsequent flowers. Males appear unable to remove pollen from the thorax.
Ecological Role
of Mentzelia involucrata. Unwitting pollinator of Mohavea confertiflora through a deceptive pollination system based on sexual mimicry. The is a rare whose specialized makes it vulnerable to disruption affecting its plants.
Human Relevance
Documented as a case study in floral mimicry and deceptive pollination. The discovery of this system at Kofa National Wildlife in 2001 highlighted previously unrecognized complexity in plant- interactions. No direct economic importance; the is rare and localized.
Similar Taxa
- Xeralictus timberlakeiSister occurring west of the Colorado River; morphologically similar and involved in the same mimicry system with Mentzelia and Mohavea on the western side of the river