Compound Odontoma Removed by Endoscopic Intraoral Approach: Case Report

A 12-year-old Japanese boy was referred to our hospital for evaluation of a radiopaque area on the left side of the mandible. Radiographic and computed tomographic examinations revealed a radiopaque lesion located on the lingual side, along with permanent tooth eruption. Several small tooth-like structures were noted within the lesion and the mandibular left second premolar was inclined in a mesial direction. An odontoma was clinically diagnosed and surgical removal by an endoscopic intraoral approach under general anesthesia was planned. Reports of oral surgery using an endoscopic approach have been presented, though none for an odontoma. With the expectation that removal of the odontoma would improve dentition in this case, we planned future management. A minimally invasive surgical removal procedure by an endoscopic intraoral approach from the lingual side was performed and good early recovery was noted. The resected tumor consisted of several small tooth-like structures. Histopathological diagnosis was a compound odontoma. One-year follow-up findings showed that the post-surgical course was good.

A new subspecies of the mantis Hierodula patellifera (Mantodea: Mantidae) from the Daito Islands, the Ryukyus, Japan

A new subspecies of the Asian mantis Hierodula patellifera (Audinet-Serville, 1839), Hierodula patellifera daitoanassp. nov., is described based on specimens collected from the Daito Islands, the Ryukyus, Japan. This new subspecies is distinguished from the nominotypical subspecies H. patellifera patellifera in adulthood by the relatively larger body size, the larger number of antennal segments, the presence of a white marking along the dorsal-inner surface on the procoxa, and marginal spines of the procoxa comprising two large and several small tooth-like projections.

Complex Odontoma: A Case Report

Odontoma, a mixed odontogenic tumor, is considered to be a hamartoma rather than a true neoplasm. Fully developed odontomas chiefly consist of enamel, dentin, pulp and occasionally cementum. They are subdivided into compound and complex types. The compound odontoma is composed of multiple, small tooth like structures, whereas the complex type consists of a conglomerated mass of enamel and dentin, having no anatomical resemblance to a tooth. They are usually asymptomatic, slow growing but cause bony expansion, which is often discovered during routine radiography. Here, we report a case of a complex odontoma in the posterior left mandibular region in an eight year old female child.

Opaepupu, a new genus and species of bivalve-associated shrimp (Decapoda: Caridea: Palaemonidae) from Hawai’i

A new palaemonid shrimp genus, Opaepupu gen. nov., is established to accommodate a new species of bivalve-associated shrimp, Opaepupu huna sp. nov. from Hawaii. A single mated pair, the female holotype and the male allotype, were found inside the trapezid bivalve Trapezium oblongum (Linnaeus, 1758) at a depth of 14 m in Kâne’ohe Bay, Hawai’i. The new genus is characterised by the rostrum being proximally broad, distally pointed, mid-dorsally carinate, and non-dentate; the anterolateral margin of the carapace without supraorbital, hepatic or epigastric teeth, but with a strong sharp antennal tooth; the sixth pleonite posteriorly unarmed; the telson medially depressed, with the dorsal surface armed with two pairs of submarginal cuspidate setae and with the posterior margin armed with two pairs of spiniform setae; the distolateral angle of the first article of the antennular peduncle without a sharp tooth; the mandible without a palp; the maxillular palp furnished with one long stiff seta dorsal to a small tooth-like extension; the first maxilliped without a palp; the third maxilliped not being operculate; the second pereiopods moderately robust, relatively slender, subequal, subsymmetrical, with simple teeth on the cutting edges of the fingers; the ambulatory pereiopods being slender, each ending in an elongate biunguiculate dactylus; and the uropodal exopod with a faint diaeresis and greatly reduced distolateral spiniform seta. The phylogenetic position of Opaepupu gen. nov. remains unclear, although it does not appear to be closely related to other bivalve-associated palaemonid genera.

Modal analysis and experimental research on a planetary reducer with small tooth number difference

To comprehensively analyze the modal characteristics of the planetary reducer with small tooth number difference, based on shaft–bearing–gear–shell coupling, a finite element modal analysis model was established in ABAQUS. The teeth meshing sites were constrained by binding, bearings were simulated by spring elements, and then the natural frequencies and corresponding vibration modes of the reducer were obtained by applying the Lanczos method. Further, a hammering modal experiment on the reducer was carried out utilizing LMS Test.Lab. The modal data were analyzed using a modal identification method, and the modal frequencies and damping ratios were achieved, also the experimental modal parameters were validated according to the modal assurance criterion. The research results indicate that the lowest-order natural frequency of the reducer is 148.53 Hz, which is much higher than the rotation frequency of the eccentric shaft, double gear, and output gear. Also, the two-stage gear mesh frequencies are away from the natural frequencies, therefore the reducer under normal operating conditions will not cause coupling resonance. This research provides a theoretical basis and experimental reference for the dynamic structure optimization of the planetary reducer.

A new species of Ferorhinella (Hemiptera: Cercopidae) from southeastern Brazil with taxonomic notes on the genus

A new species of Ferorhinella Carvalho & Webb 2004 from southeastern Brazil is described and illustrated, and a taxonomic key to species in the genus is provided. Ferorhinella itatiaiensis sp. nov. can be distinguished from other known species of the genus mainly by the paramere with rounded apex and two subapical lateral spines on outer surface, one long, dorsally inserted and the other one small, ventrally inserted; and dorsal margin of the subgenital plates with a rectangular elevation, covered with small, tooth-like spines.

On the first <i>Silis</i> Charpentier, 1825 from Baltic amber (Coleoptera, Cantharidae)

Only in recent years have new genera and species of the subfamily Silinae Mulsant, 1862 been described as inclusions in amber. However, no representative of the genus Silis Charpentier, 1825 had been described from Baltic amber, even if few specimens were already known at the generic level. Silis lombardii sp. nov. is entirely dark brown and shows (as usual for the genus) the two characteristic lobes in the sides of pronotum, elongated elytra, and a basal small tooth only on the anterior claws. The Eocene findings show that the subfamily is of ancient origin and that at least in the Eocene it was much more abundant than today in the same territories, where only two species are known. (urn:lsid:zoobank.org:act:76887127-3D24-41DA-86CC-7DCAB40DC3B7)