turbinate

(redirected from turbinal)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

turbinate

[′tər·bə·nət]
(botany)
Shaped like an inverted cone.
(invertebrate zoology)
Spiral with rapidly decreasing whorls from base to apex.
References in periodicals archive ?
The location of this ridge suggests it may have supported a respiratory turbinal.
The ridge in GS M796, therefore, lies closely dorsal to the likely course of the nasolacrimal duct, similar to the respiratory turbinal of modern mammals.
Although in adult mammals this turbinal is generally attached to the maxillary bone, rather than the nasal, it develops ontogenetically from a distinct cartilaginous precursor, which only later becomes attached to the adjacent dermal bones (Moore 1981).
No evidence exists of turbinal ridges in the maxillary "sinus.
The presence of possible respiratory turbinal ridges in Glanosuchus suggests that its nasal cavity had become actively involved in the conditioning of respired air, and suggests that the ventilation rate of this animal had increased enough to result in significant respiratory water loss.
Longitudinal turbinal ridges have long been noted on the inner surfaces of the nasal, frontal, and prefrontal bones of many cynodonts [Procynosuchus, Kemp 1979; Thrinaxodon (including "Nythosaurus"), Watson 1913; Fourie 1974; Diademodon, Watson 1913; Brink 1955, 1956; Exaeretodon, Bonaparte 1966; Luangwa, Kemp 1980; Oligokyphus, Kuhne 1956].
These ridges correspond in location to the maxilloturbinal ridges of extant mammals and are similar to the ridge for the respiratory turbinal of Glanosuchus, described above.
Their location in the large respiratory chamber, and their association with the nasolacrimal duct strongly suggest that these ridges supported a turbinal structure like that found in extant mammals, with a similar water-recovery function.
There appears to be a functional relationship between the maxilloturbinal and this duct, which provides some of the moisture required to operate the turbinal complex.
The pattern of nasal turbinal ridges in therapsids indicates that the ventilation rates of the more primitive groups (dinocephalians, dicynodonts, and gorgonopsians) probably had not yet increased significantly beyond ancestral rates.
The nasal turbinal ridges of the earliest mammals are essentially identical to those of extant mammals, suggesting that the development of "mammalian" respiration rates and endothermy was largely complete by this time (cf.