ostiolum

ostiolum

A small opening; a small door.
References in periodicals archive ?
Ficus is characterized by its unique flask-like urceolate inflorescence (fig or syconium) with internal staminate and pistillate flowers and a small circular or split-shaped terminal orifice, the ostiolum, barred by stiff bracts, through which the symbiotic pollinating wasps must pass to reach the syconial cavity, oviposit in some of the female florets that become galls, where their larvae develop, and pollinate some of them that become seeds.
The males have two mandibular glands and antennae basically 4-segmented with an anellus, while the female has one gland and do not break off the antennae and wings when they penetrate through the ostiolum (Ramirez, 1970).
Due to the conformation of the ostiolum and to the distribution of the fig species in submontane, described by Berg (2009), and montane humid forest from 900 to 2 900 m in altitude or more, the author suggest that at least 10 fig species host Hexapus morphotypes, described by Berg (2009); among them: Ficus bombuscaroana C.
On the contrary, fig species associated with Tetrapus usually have the ostiolum without distinct superficial interlocking bracts, but a linear tubular entrance only, and the female Tetrapus has one mandibular appendage.
Studies on the structure and life-history of Ostiolum oxyorchis (Ingles) from the California red-legged frog Rana aurora draytoni.