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The ecdysial suture is longitudinally placed on the vertex, separating the epicranial halves of the head to the left and right sides. Depending on the insect, the suture may come in different shapes: like either a Y, U or V. Those diverging lines that make up the ecdysial suture are called the frontal or frontogenal sutures.
Adult Rhopalomyia solidaginis fly, emerging from pupal case Process of ecdysis of a cicada.. Ecdysis is the moulting of the cuticle in many invertebrates of the clade Ecdysozoa.
Cranial sutures are indicators of skull function and morphologies can be linked to specific feeding modes. [14] Transitional feeding changes can be observed by examining cross sectional morphology of a suture in taxa of the fish-tetrapod transition. [15]
Chalcidoid wasps are small wasps (most within the range 0.5–5 mm). However the group does include the smallest known insect (Dicopomorpha echmepterygis males have a body length of 0.14–0.24 mm); the largest chalcidoids include Leucospis gigas with a body length of up to 21 mm [2] and Doddifoenus wallacei with a body length of up to 19.6 mm. [3]
Cheloniellon may have been a benthic predator, [3] using its gnathobases to crush prey while the spiny labrum may have helped lead food items toward the mouth opening. [1] The specialized second appendages are too fragile to be raptorial, instead they may have played a tactile role, sensing the property and position of food items. [1]
Expansion forces at the sutures lead to expansion of bone and thus growth of craniofacial skeleton. Cranial vault increases in size via the primary growth of bone that happens at the suture. Sicher theorized that tissues such as periosteum , Cartilage and sutures are growth centers just like epiphysis of the long bone that allow the bone to form.
Members of the Phylloceratidae are characterized by smooth, involute shells with very thin walls. Many are covered with fine growth lines but are usually without ribbing. Sutures are complex with the major and minor branches of the saddles with phylloid or spatulate endings. [1]
The notopleuron is a thoracic pleurite (a sclerite on the pleuron) situated at the end of the transverse suture of Diptera. Apart from in the Diptera, visible notopleural structures occur in the beetle suborder Adephaga and in certain Hemiptera , but this list is not exhaustive.