- according to Hottinger (2006):
ODD PAIRS - (or associations); (Français: associations dépariées) common associations of two or more foraminiferal species that exhibit an identical or a closely related architecture in their adult form but differ markedly in their adult size. In most cases, the difference in the size of the adults is matched by a corresponding, size-dependant architecture in the megalospheric embryo, i.e. a large embryonal apparatus in the larger form, versus a simple, more or less undifferentiated megalosphere in the odd partner. These partnerships are usually restricted to one or two pairings of species. An example of a recent odd pair is the frequent association of Amphisorus hemprichii with the odd partner Sorites orbiculus. They have the same habitat on seagrass leaves but reproduce at different times in the seasonal cycle (Hottinger, 1999).
Hottinger (1999), "Odd partnership", a particular size relation between close species of larger foraminifera, with an emendation of an outstandingly odd partner, Glomalveolina delicatissima (Smout, 1954), Middle Eocene, Eclogae geologicae Helvetiae, Basel, vol. 92, N° 3, p. 385-393.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744.