A comparison of adhesive performance among six cursorial spider species

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  A comparison of adhesive performance among six cursorial spider species Abstract The ability to adhere to surfaces is particularly relevant for cursorial predatory arthropods like hunting spiders, which often traverse relatively complex environments characterized by large variation in substrate properties. Here, we evaluated the adhesive performance of six hunting spider species that are common in eastern temperate North America and lack specialized tarsi for climbing smooth or inclined surfaces [Lycosidae: Pardosa lapidicina Emerton, 1885 and Rabidosa rabida (Walckenaer, 1837); Oxyopidae: Oxyopes salticus Hentz, 1845; Pisauridae: Pisaurina mira (Walckenaer, 1837); Dolomedidae: Dolomedes triton (Walckenaer, 1837), and Dolomedes scriptus Hentz, 1845]. We tested adhesion performance as shear load resistance (g) on a glass plate, and as the angle of failure (°) when the plate was gradually inclined relative to horizontal. Average angle of failure and shear resistance differed among ...

One more new species of Betaburmesebuthus Lourenço, 2015 trapped in Burmite (Scorpiones: Palaeoburmesebuthidae)

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One more new species of Betaburmesebuthus Lourenço, 2015 trapped in Burmite (Scorpiones: Palaeoburmesebuthidae)

Abstract 

One more new species of fossil scorpion belonging to the genus Betaburmesebuthus Lourenço,2015, is described from the Cretaceous amber of Myanmar (Burma). The new species is characterized bya combination of several morphological features and in particular a strongly elongated carapace with largemedian eyes, a conspicuous granulation on the telson and an aculeus enlarged at its base, and the absenceof any major granulations or apophysis in both femur and patella of pedipalps. The description of the newspecies confirms, once again, that the genera of the family Palaeoburmesebuthidae are most certainly themost speciose among those found in the Burmese amber-producing forests.

Lourenço W. R. & Velten J., 2025. – One more new species of Betaburmesebuthus Lourenço, 2015 trapped inBurmite (Scorpiones: Palaeoburmesebuthidae). Faunitaxys, 13(57): 1 – 4. https://archive.org/details/faunitaxys-f-395