First report of a nest of Ceratina (Ceratinula) fioreseana Oliveira (Hymenoptera: Apidae)

ABSTRACT. We provide herein the first report of a nest of Ceratina (Ceratinula) fioreseana Oliveira, 2020, a species that was recently described for the Cerrado domain. The nest was collected in a Passiflora edulis Sims (Passifloraceae) plantation in Minas Gerais State, Brazil and was built in a trap nest, a dry petiole of Cecropia pachystachya Trécul (Urticaceae). Within the nest there was a living female and a brood cell without partition containing a pupa, whose adult female emerged 28 days after pupation. Pollen analysis revealed the dominance of Emilia fosbergii Nicolson (Asteraceae) pollen grains, a weed recorded a few meters from the nest. The record of an adult female within the nest with a pupa and the absence of nest partition might suggest social behavior in this bee species.摘要：本研究首次报道了2020年由Oliveira描述的塞拉多（Cerrado）生态区新近定名物种菲奥雷塞小芦蜂（Ceratina (Ceratinula) fioreseana Oliveira, 2020）的巢穴。该巢穴采集自巴西米纳斯吉拉斯州的一处西番莲（Passiflora edulis Sims，西番莲科Passifloraceae）种植园，筑于诱捕巢——即号角树（Cecropia pachystachya Trécul，荨麻科Urticaceae）的干燥叶柄——之中。巢穴内存有一头存活的雌性个体，以及一个无隔板的育幼室，室内含有一只蛹，该蛹在化蛹28天后羽化为成虫雌性。花粉分析结果显示，巢穴内花粉粒以福斯堡一点红（Emilia fosbergii Nicolson，菊科Asteraceae）为主，该杂草的分布点距巢穴仅数米之遥。巢穴内存在成虫雌性与蛹共存、且无巢穴隔板的记录，或暗示该蜂类物种存在社会性行为。