Abstract We present the first known cranial remains of fossil batoid †Onchopristis numidus. Based on two exceptionally well-preserved specimens collected from ‘Kem Kem Beds’ (Albian–Cenomanian), south-east Morocco, an almost complete description rostral and portions genus is provided, together with new observations regarding development arrangement denticle series for this genus. The comparison...

An electron microscope study was made of Deltotrichonympha and Koruga, two closely-related hypermastigote flagellates that live in the hindgut of the Australian termite, Mastotermes darwiniensis These symbiotic protozoans have a typical flagellated rostrum and long body flagella. Their "giant centrioles" (centriolar apparatus) are large, fibrillar, and granular bodies which do not resemble typi...

Perhaps the most striking feature of billfishes is the extreme elongation of the premaxillary bones forming their rostra. Surprisingly, the exact role of this structure in feeding is still controversial. The goal of this study is to investigate the use of the rostrum from a functional, biomechanical and morphological standpoint to ultimately infer its possible role during feeding. Using beam th...

PURPOSE To study the anatomy and embryology of the lamina rostralis, and to determine whether the rostrum is, as frequently stated, the last section of the corpus callosum to develop. METHODS The rostrum was analyzed in dissected adult brains and on MR studies in 300 patients with a normal corpus callosum and in 84 patients with a hypogenetic corpus callosum. MR images of intact fetuses and p...

Members of the Miridae (Lygus lineolaris Palisot de Beauvois and Pseudatomoscelis seriatus Reuter) and Pentatomidae (Acrosternum hilare Say, Euschistus servus (Say), Euschistus tristigmus (Say), Euschistus quadrator Rolston, Oebalus pugnax (F.), Piezodorus guildinii (Westwood), and Thyanta custator accerra McAtee) comprise a piercing-sucking insect complex that continues to plague multiple crop...

Cranial and post-cranial variation is described for a large series of specimens spectacled porpoise from Argentina compared with that other areas the Southern Hemisphere. Condylobasal length in 54 adult skulls was 276-424. Tooth counts were 16-26 17-23 upper lower jaws, respectively. Total number vertebrae (n = 20) 66-70. The rostrum may be relatively smaller Auckland Islands than regions.

Oslerus ( ) brachyurus sp. nov. was collected from the mucosa of inner surface trachea and bronchi Chrysocyon Atlantic forest area, in state Minas Gerais, Brazil. The new species is described based on morphological metric analyses. differs morphologically only subgenus O. ), osleri , for not possessing a cuticular collar or protusible rostrum anterior region, having one well developed excretory...

The distribution and density of the ampullary electroreceptors in the skin of elasmobranchs are influenced by the phylogeny and ecology of a species. Sensory maps were created for 4 species of pristid sawfish. Their ampullary pores were separated into pore fields based on their innervation and cluster formation. Ventrally, ampullary pores are located in 6 areas (5 in Pristis microdon), covering...

Macrobrachium prabhakarani new species is described from the Vamanapuram River, Kerala, S. India. The species shares certain characters with M. scabriculum and M. madhusoodani, while it differs remarkably from these two species in distinctive diagnostic characters: rostral formula 12–14/1–2 with 5–7 postorbital teeth; carapace smooth with distal end of rostrum directed forwards; chelae with nin...

Aim: Corpus callosum (CC) is a white matter structure and it the largest interhemispheric commissure that connects brain hemispheres. The morphology of CC can be affected by congenital acquired diseases, sex, age, hand selection. This study aims to investigate morphometric features age gender.Material Methods: Thickness all corpus segments length long axis healthy pediatric population were meas...