Abstract
Two new genera of chedimine palpimanids are described. Chedimanopsgen. n. includes the type species, Chedimanopseskovisp. n. (♂♀), and Chedimanopsrwenzorensissp. n. (♂♀), both from the far eastern part of the Democratic Republic of Congo (Rwenzori Mts.). The monotypic Hybosidellagen. n. is based on Hybosidellaetindesp. n. (♂) from Cameroon. The new genera differ from all other Palpimanidae by possessing only the anterior median eyes (all other eyes are lost). These new genera can be distinguished from one another by the shape of the thoracic fovea (a narrow bracket-shaped pit vs. a longitudinal groove, respectively), as well as by the structure of the abdominal scuta and the male copulatory organ, peculiarities of coloration, amongst other characters. The taxonomic position and relationships of the newly described taxa are briefly discussed. The distinctive characters and a key to both species of Chedimanopsgen. n. are also provided.
Highlights
The majority of spiders have eight eyes, there are several families and many genera with six eyes
Pale coloured; carapace shorter than 1.4 mm; claw-shaped process (Cp) bent twice (Figs 51, 52), membranous process (Mp) large, distinct, cymbium 1.5 times longer than wide; receptacles spaced from epigastral fold by less than one diameter (Figs 5, 39), number of grape-shaped glands less than 10
The tribe Chedimeae was established for the spiders with anterior and posterior lateral eyes almost touching each other
Summary
The majority of spiders have eight eyes, there are several families and many genera with six eyes. Microstigmatidae and Tetrablemmidae, the eyes that seem to be present are anterior laterals (Platnick and Forster 1982; Lehtinen 1981; respectively), while in the Caponiidae with two eyes, only the anterior medians are retained (Jocqué and Dippenaar-Schoeman 2006). Almost all the palpimanids known to date have eight eyes, while only Hybosida Simon, 1898 is six-eyed (Jocqué and Dippenaar-Schoeman 2006). A study of the somatic characters and the copulatory organs of these two-eyed palpimanids has revealed that they belong to three undescribed species that can be placed in two new genera belonging judging from their minute size and structure of the male copulative organs (which is considered and discussed below) to the subfamily Chediminae. This paper describes the new taxa and discusses their newly discovered characters
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