Pennalithus Kamura, 2021 (ŢRffƌ)

Mu, Yannan & Zhang, Feng, 2023, Further additions to the guardstone spider fauna from China (Araneae: Phrurolithidae), Zootaxa 5338 (1), pp. 1-104 : 73-74

Pennalithus Kamura, 2021 (ŢRffƌ)

Pennalithus Kamura, 2021: 119

(type species: Phrurolithus pennatus Yaginuma, 1967 , by original designation).

Diagnosis. This genus can be distinguished from all other phrurolithid genera by the femur I with some prolateral spines (at least two), the femur II without prolateral spine; the male palp with retroventral tibial apophysis; the female with a pair of blind ducts protruding anteriorly but without bursa.

Description. Small spiders. Carapace oval, highest near fovea, widest at coxae II and III. Chelicerae with three well separated promarginal and two close retromarginal teeth, with two spines anteriorly (one long and another short). Femur I usually with two dorsal spines and more than two prolateral spines distally, femur II usually with two prolateral spines but without dorsal spine; tibia I usually with more than six pairs of ventral spines, tibia II usually with six pairs of ventral spines (usually unpaired); metatarsus I usually with four pairs of ventral spines, metatarsus II usually with four proventral spines and three retroventral spines. Abdomen oval, black, with large dorsal scutum in dorsal view in males but without in female. Male palp: femur only with somewhat swollen; tibia with one large retrolateral tibial apophysis and one small retroventral tibial apophysis; tegulum oval, sperm duct long, U-shaped; embolus relatively short, situated at tip of tegulum. Female epigyne: internal genitalia with a pair of blind ducts protruding anteriorly but without membranous bursa.