Hybosidella, Zonstein, Sergei L. & Marusik, Yuri M., 2017

Zonstein, Sergei L. & Marusik, Yuri M., 2017, Descriptions of the two-eyed African spider genera Chedimanops gen. n. and Hybosidella gen. n. (Araneae, Palpimanidae, Chediminae), African Invertebrates 58 (1), pp. 23-47 : 30-33

Genus Hybosidella gen. n.

Type species.

Hybosidella etinde sp. n.

Etymology.

The generic name is a diminutive of Hybosida , the palpimanid genus, similar in appearance. The gender is feminine.

Diagnosis.

The new genus can be easily distinguished from all other known palpimanids, except Chedimanops gen. n., by having only two eyes. Hybosidella gen. n. can be distinguished from Chedimanops gen. n. by the much narrower slit-like thoracic fovea, smaller size (carapace less than 1.1 long, vs. more than 1.3 in the latter), lack of lateral extensions (Ee) of epigastric scutum (present in Chedimanops gen. n.), wide and short lateral postgastral scuta (thin and long in the latter, cf. Figs 36-39, 43), bifurcated claw-shaped process (undivided in Chedimanops gen. n., cf. Figs 49-52, 64-66) and well sclerotized embolus (Em) lacking in related genus (cf. Figs 32, 53).

Description.

Body length less than 2.5 mm. Carapace finely granulated, oval in dorsal view and covered with fine setae. Cephalic part distinctly raised behind eye area. Thoracic fovea transverse, very narrow and slit-shaped. Two eyes, only AME present, other eyes lost. Eyes moderately large, spaced by ca. 0.4 of their diameter. Clypeus nearly 1.5 times higher than AME diameter. Chelicerae downward-directed, without stridulatory ridges. Sternum with fine reticulation, more coarsely granulated anteriorly. Labium triangular with deep median suture (Ms), slightly longer than wide at base.

Legs: formula 1423. Leg cuticle smooth. Femur I moderately swollen; patella shorter than tibia, metatarsus short, tarsus short and dilated (Fig. 40). Tibia I subapically and metatarsus I with dense prolateral scopula. Leg tarsi straight and ascopulate. Claw tufts weakly developed. Leg tarsi with two narrow and weakly dentate claws.

Abdomen: ovoidal, slightly extended anteriorly and obtuse posteriorly. Abdominal scuta conforming a very short pedicel tube; dorsal portion of scutum with well-developed posterior margin. Epigastral scutum without lateral extensions. Postgastral lateral scuta (PsL) short and wide, median scuta indistinct (if present). AMS small, PMS and PLS not evident.

Male palp: as in Figs 53-54, 64-66. Femur 2.5 times longer than wide; patella almost round, slightly thinner than femur. Tibia strongly swollen, almost as wide as long, approximately 2 times wider than femur, ventral length subequal to dorsal. Cymbium thin and long, ca 2.7 longer than wide. Tegulum longer than wide, more than 1.5 times thinner than patella and lacking processes. Sperm duct not evident. Embolic division embedded into tegular cavity and bears strong, heavily sclerotized claw-shaped process (Cp) bifurcated in the terminal 1/3, with both arms sharply pointed, and retrolateral arm thicker than prolateral. Embolus (Em) noticeably smaller and shorter than neighbouring outgrowth, wider at base, and bent apically.

Female copulatory organ: unknown.

Species included.

The type species only.

Distribution.

The genus is currently known only from the southwestern part of Cameroon.