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 ...

Scorpions of the Horn of Africa (Arachnida: Scorpiones). Part XLII. Parabuthus qaraaf sp. n. from Ethiopia (Buthidae)

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Scorpions of the Horn of Africa (Arachnida: Scorpiones). Part XLII. Parabuthus qaraaf sp. n. from Ethiopia (Buthidae)

Abstract


A new species Parabuthus qaraaf sp. n. from Ethiopia is described. Combination of six characters: metasoma V black; pectine teeth number 33–42 in both sexes; pedipalp chela length/ width ratio 3.3 in male and 4.2 in female; pedipalp patella length/ wide ratio 2.36–2.38 in both sexes; fingers of pedipalp of male with inner side of base smooth, no trace of tubercle; metasoma V length/ wide ratio is 1.50 in male distinguish P. qaraaf sp. n. from all other species in the region. Included is also a map of distribution of Parabuthus species in Horn of Africa, with newly confirmed localities for Parabuthus granimanus Pocock, 1895 and P. robustus Kovařík et al., 2019.


Kovařík, F., & Elmi, H. S. 2025 . Scorpions of the Horn of Africa (Arachnida: Scorpiones). Part XLII. Parabuthus qaraaf sp. n. from Ethiopia (Buthidae). Euscorpius, No. 419: 1-q1. https://mds.marshall.edu/euscorpius/vol2025/iss419/1/