A new nematode species, Pristionchus entomophilus n. sp., was collected during a soil sample survey in Yixing of Jiangsu province, eastern China. P. entomophilus n. sp. is distinguished by its unique characteristics. This new species is mainly hermaphroditic, with males seldom found. The new nematode has a similar body length but has much narrower body width compared with P. pacificus. Its body...

Figure 1. Mechanosensory skin denticles (MSDs). (A) Astroblepus pholeter. Scale 1 cm. (B) Scanning EM of MSDs; on the head (asterisk marks the eye, scale 1 mm). (C) A club-like MSD protruding from a socket (scale 100 μm). (D) Histological cross-section of base and innervation (arrowhead) of MSD (scale 100 μm). (E) Pseudocolored TEM of MSD socket (yellow: neuron, red: muscle, blue: dentine; scal...

Study of four poorly known cladocera species of the genus Camptocercus Baird,1843 (Anomopoda: Chydoridae): North American C. oklahomensis Mackin, 1930, and three Palearctic species, C. uncinatus Smirnov, 1971, C. fennicus Stenroos, 1898, and C. lilljeborgi Schoedler, 1862, revealed strong differences between them in both outer morphology and morphology of appendages. C. oklahomensis lacks a hea...

The present work morphologically characterizes Paratrichodina africana from the gills of wild and farmed Nile tilapia from Northern Brazil (eastern Amazonia). Ninety fish were captured for parasitological analysis in Macapá, State of Amapá, from a wetland area bathed by the Amazon River commonly called 'Ressaca do Zerão' (n = 52), as well as from a local fish farm (n = 38). Wet smears of the sk...

The ant genus Odontomachus Latreille is reviewed for Sumatra, the sixth largest island in the world and located in western Indonesia. Previously three species were recorded from the island: O. simillimus F. Smith, O. rixosus F. Smith, and O. latidens Mayr. We add two species to the fauna, O. procerus Emery stat. nov and Odontomachus minangkabau sp. nov. The new species belongs to O. rixosus spe...

Epidermal cells of Drosophila form a variety of polarized structures during their differentiation. These polarized structures include epidermal hairs, the shafts of sensory bristles, larval denticles and the arista laterals. The arista is the terminal segment of the antenna and consists of a central core and a series of lateral extensions. Here we describe the cellular mechanisms involved in th...

The tumor suppressor adenomatous polyposis coli (APC) negatively regulates Wingless (Wg)/Wnt signal transduction by helping target the Wnt effector beta-catenin or its Drosophila homologue Armadillo (Arm) for destruction. In cultured mammalian cells, APC localizes to the cell cortex near the ends of microtubules. Drosophila APC (dAPC) negatively regulates Arm signaling, but only in a limited se...

Definitive therizinosaurid cranial materials are exceptionally rare, represented solely by an isolated braincase and tooth in the North American taxon Nothronychus mckinleyi, the remarkably complete skull of the Asian taxon Erlikosaurus andrewsi, and the lower hemimandibles of Segnosaurus galbinensis. To date, comprehensive descriptions of the former taxa are published; however, the mandibular ...

A partial skeleton of a hybodontiform shark-like chondrichthyan from the Upper Jurassic Kimmeridge Clay Formation Dorset, England, is described and designated as new genus species, Durnonovariaodus maiseyi gen. et sp. nov. The holotype only known specimen, which represented by disarticulated splanchnocranial elements with associated teeth, single dorsal fin spine, pelvic girdle, well unidentifi...

Claviradulomyces xylopiae sp. nov. is introduced for a fungus occurring in association with abnormal (enlarged, spongy) lenticels of Xylopia sericea (Annonaceae), a common tree of the Atlantic forest and Cerrado ecosystems in Brazil. This is the second species described in the genus and, although it is morphologically distinct from the type species, C. dabeicola from West Africa, it possesses t...