Water strider (Ptilomera tigrina)

Water strider (Ptilomera tigrina) is an animal species in Gerridae, a predatory insect that spends time on the surface of fast water with back and forth movements with a speed of up to 1.5 m/s to float and is very easily recognized by its habit of always walking and jumping on around water.

P. tigrina has an elongated, dark cylindrical body with several bright or silvery white parts. A pair of big eyes at the tip of the head. The stomach has joints and tapers towards the back.

A pair of antennae is very long with several joints and stick-shaped legs. The forelegs pair have three sections with two joints and the first is slightly thickened. The second and third pairs of legs are several times the length of the body.

Water strider has a very fast movement on the surface of the water to float and target prey near the surface. This species is a model in biophysical research regarding the ability to float on the surface and the ability to move forward quickly.

The buoyancy originates from the microsetae arranged in a specific direction and nanometer-sized grooves at the end of the leg and is provided with a waxy coating, but the hydrophobic effect is due more to the physical structure of the limbs than to the wax coating.

The angle of contact of the legs with water, tiny hairs and indentations cause air to become trapped and act as a float. P. tigrina presses the surface of the water using the middle leg without penetrating the surface to form a basin on the surface. Hollows to propel the body forward.

Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Subclass: Pterygota
Order: Hemiptera
Suborder: Heteroptera
Infraorder: Gerromorpha
Superfamily: Gerroidea
Family: Gerridae
Subfamily: Ptilomerinae
Genus: Ptilomera
Species: Ptilomera tigrina

Humpback whales (Megaptera novaeangliae) manufacture bubble-nets as tools to increase prey intake

NEWS - Humpback whales ( Megaptera novaeangliae ) create bubble net tools while foraging, consisting of internal tangential rings, and actively control the number of rings, their size, depth and horizontal spacing between the surrounding bubbles. These structural elements of the net increase prey intake sevenfold. Researchers have known that humpback whales create “bubble nets” for hunting, but the new report shows that the animals also manipulate them in a variety of ways to maximize catches. The behavior places humpbacks among the rare animals that make and use their own tools. “Many animals use tools to help them find food, but very few actually make or modify these tools themselves,” said Lars Bejder, director of the Marine Mammal Research Program (MMRP), University of Hawaii at Manoa. “Humpback whales in southeast Alaska create elaborate bubble nets to catch krill. They skillfully blow bubbles in patterns that form a web with internal rings. They actively control details such ...

Purhepecha oak (Quercus purhepecha), new species of shrub oak endemic to the state of Michoacán, Mexico

NEWS - In Mexico, several Quercus shrubby species are taxonomically very problematic including 8 taxa with similar characteristics. Now researchers report the purhepecha oak ( Quercus purhepecha De Luna-Bonilla, S. Valencia & Coombes sp. nov.) as a new tomentose shrubby white oak species with a distribution only in the Cuitzeo basin in the Trans-Mexican Volcanic Belt (TMVB). Quercus Linnaeus (1753) subdivided into 2 subgenera and 8 sections of which section Quercus (white oaks) has the widest distribution in the Americas, Asia and Europe. This section is very diverse in Mexico and Central America with phylogenomic evidence indicating recent and accelerated speciation in these regions. The number of shrubby oak species in Mexico is still uncertain. De Luna-Bonilla of the Universidad Nacional Autónoma de México and colleagues found at least 3 taxa in the TMVB, specifically Quercus frutex Trelease (1924), Quercus microphylla Née (1801) and Quercus repanda Bonpland (1809). In 2016,...

Cempaki (Termitomyces microcarpus)

Cempaki ( Termitomyces microcarpus ) is a species of fungus in the Lyophyllaceae family. It grows wild in tropical Asian forests near termite nests. It is rarely reported in urban areas. It is edible and known for its deliciousness, high nutritional value, and difficulty in cultivating. In Indonesia, it is used as an alternative food ingredient. T. microcarpus is the smallest of the Termitomyces species, umbrella-shaped, plain white, measuring 5 cm tall and 2.5 cm wide. It grows in dense clusters on surfaces and forms a mutualistic relationship, requiring the metabolic activity of termites as a substrate for growth. This species is known for its deliciousness, rich in nutrients, and has potential bioactive properties, such as helping lower cholesterol and acting as a tonic. Currently, it is difficult to cultivate on a large scale, and people rely solely on wild harvests. This mushroom is highly favored for its savory, delicious flavor and soft, chewy texture. It is often stir-fried ...

Dlium