Two new species of pterygosomatid mites Pterygosoma garissi sp. nov. and P. fragilis sp. nov. (Acari: Pterygosomatidae) are described from the agamid lizard Agama agama (Sauria: Agamidae) from Kenya. P. garissi sp. nov. is similar to P. annectans Jack, 1962 but in the new species the peripheral setae are slightly expanded apically, 3 pairs of setae are situated on the coxal fields I and and 2 p...

Drosophila has helped us understand the genetic mechanisms of pattern formation. Particularly useful have been those organs in which different cell identities and polarities are displayed cell by cell in the cuticle and epidermis (Lawrence, 1992; Bejsovec and Wieschaus, 1993; Freeman, 1997). Here we use the pattern of larval denticles and muscle attachments and ask how this pattern is maintaine...

Specimens of Trichodina magna Van As and Bassson, 1989 (Ciliophora: Peritrichia) from the Nile tilapia Oreochromis niloticus collected from October 2004 to June 2005 in fish ponds situated in three regions of Santa Catarina State, Brazil are described here. Wet smears of skin and gills were prepared in the field, air dried, impregnated with Klein's dry silver method and Giemsa's solution. From ...

Heterodera pakistanensis n. sp., described and illustrated from roots of common wheat (Triticum aestivum) from Sukkur, Sind, Pakistan, belongs to the goettingiana group. It is most closely related to H. cyperi Golden, Rau &Cobb, 1962, H. raskii Basnet & Jayaprakash, 1984, and H. mothi Khan &Husain, 1965. Second-stage juveniles (J2) can be distinguished from H. cyperi J2 by an areolated lateral ...

BACKGROUND Peripheral odontoma arising in the extraosseous soft tissues is rare and if not removed early, may enlarge over time and eventually erupt in the oral cavity. CASE PRESENTATION A 15-year-old girl presented with "denticles on the gingiva". During the intraoral examination, seven small tooth-like structures were found. These were exposed in the anterior left gingiva between the perman...

A new bufonid amphibian, belonging to a new monotypic genus, is described from the Andaman Islands, in the Bay of Bengal, Republic of India, based on unique external morphological and skeletal characters which are compared with those of known Oriental and other relevant bufonid genera. Blythophryne gen. n. is distinguished from other bufonid genera by its small adult size (mean SVL 24.02 mm), t...

The process of epithelial morphogenesis defines the structure of epidermal tissue sheets. One such sheet, the ventral epidermis of the Drosophila embryo, shows both intricate segmental patterning and complex cell organization. Within a segment, cells produce hair-like denticles in a stereotypical and highly organized pattern over the surface of the tissue. To understand the cell biological basi...

We describe and illustrate a new species of biting midge belonging to the subgenus Forcipomyia (Microhelea), from the Estação Biológica de Boracéia, São Paulo State, Brazil. We include illustrations of the mouthparts, head, thorax, legs, abdominal setae, and habitus. The new species is similar to the few other recorded Neotropical species of biting midges, such as Forcipomyia (Microhelea) allen...

The relationship between neural circuit function and patterns of synaptic connectivity is poorly understood, in part due to a lack of comparative data for larger complete systems. We compare system-wide maps of synaptic connectivity generated from serial transmission electron microscopy for the pharyngeal nervous systems of two nematodes with divergent feeding behavior: the microbivore Caenorha...

Lithobius yuchernovisp. n. is described, based on type material from the Ola Plateau, Magadan Region, Russia. The new species is widely distributed in northeastern Siberia, ranging from the Magadan Region, until the eastern Chukot Autonomous Region and the Kamchatka Peninsula in the southeast, whence non-type material is documented. This species belongs to the subgenus Chinobius Matic, 1973 bas...