Functional-morphological study of the upper jaw and its protrusion mechanism in Gobiidae (Teleostei)
Vancoppenolle, B.; Decleyre, D.; Verraes, W. (1993). Functional-morphological study of the upper jaw and its protrusion mechanism in Gobiidae (Teleostei). Belg. J. Zool. 123(Suppl. 1): 75-76
In: Belgian Journal of Zoology. Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Gent. ISSN 0777-6276; e-ISSN 2295-0451, meer
The study deals with the morphology and some functional aspects of the upper jaw in Gobiidae. Special attention has been paid to interspecific differences in the protrusion capacity of the premaxillary bone. Therefore, an attempt was made to set up a protrusion model in which the force transmission to the premaxillary bone is described. The movements of the premaxillary bone are influenced by the mandibula and the maxillary bone. The ligaments connected to the maxillary and the premaxillary bone partly determine the movements of both elements and thereby direct the protrusion. Some ligaments conduct the rotation of the maxillary bone, others regulate the downward sliding of the premaxillary bone. The resulting movement is a forward displacement of the most anterior point of the premaxillary bone while the processus ascendens glides downwards. Within the investigated Gobiidae, some variation occurs in the upper jaw , regarding both the shape of the skeletal elements and the length of the associated ligaments. These anatomical differences influence the movements of the maxillary and the premaxillary bones. The mobility of these elements in turn will partially determine the biting and the sucking capacity of the fish, and in that way determine which prey items can easily be consumed and which ones can not. In this respect, Gobius niger with its short ligaments and its well-developed upper jaw bones seems to be a "biting species". This is confirmed by stomach analysis. Deltentosteus quadrimaculatus appears to be a species that can forcefully bite on the one hand, but on the other hand also disposes of (and uses, as appears from stomach analysis) a remarkable suction capacity. Pomatoschistus minus and Lesueurigobius friesii appear to be two species which have morphological adaptations for both sucking and biting. Stomach analysis reveals that Pomatoschistus minutus is a "sucker", Lesueurigobius friesii appears to be a "biter".
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