Siremata, Passanha & Brescovit, 2018

Passanha, Victor & Brescovit, Antonio D., 2018, On the Neotropical spider Subfamily Masteriinae (Araneae, Dipluridae), Zootaxa 4463 (1), pp. 1-73 : 62

publication ID 10.5281/zenodo.1441911

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gen. nov.

Siremata View in CoL new genus

Type species. Siremata valteri n. sp.

Etymology. The generic name is an anagram of Masteria and herein considered a feminine noun.

Diagnosis. Siremata differs from the other Masteriinae in the presence of microspines around the eyes ( Fig. 40B View FIGURE 40 ), the quadrate pattern of the eyes, with the posterior median eyes being on a tubercle ( Fig. 40A View FIGURE 40 ) and males with ventral megaspine in the median region of tibia I ( Fig. 40C View FIGURE 40 ).

Description. Small-sized mygalomorph spiders, total length between 2.16̄4.25. Color: carapace in dorsal view, chelicerae and legs varying from whitish to dark brown, with variations of yellow, orange and light brown. Endites, labium and sternum light brown to whitish. Abdomen light brown or whitish. Clypeus narrow (0.01̄0.03) in relation to ALE. Chelicerae without rastellum. Basal segment of chelicerae with row of 9̄13 prolateral teeth and row of 10¯18 mesobasal denticles ( Fig. 41C View FIGURE 41 ). Ocular tubercle wider than long, with six eyes; AME absent, posterior row straight, PME on elevated tubercle ( Fig. 40A View FIGURE 40 ). Tegument around eyes with microspines ( Fig. 40B View FIGURE 40 ). Labium wider than long, without cuspules. Endites without cuspules, with linear serrula on apical border ( Fig. 41A View FIGURE 41 ). Sternum oval, longer than wide, without evident sigilla. Tarsus of all legs without scopulae, with few sensorial setae interspaced or many sensorial setae. Two superior tarsal claws, a row of teeth (5̄11), inferior claw with 2–4 teeth. Tibia I of males with ventral megaspine on medial portion ( Fig. 40C View FIGURE 40 ), absent in Siremata lucasae n. sp. Cymbium of male palp with 2–4 apical spines. Trichobothria filiform, corrugated bases, with longitudinal keels ( Fig. 41B View FIGURE 41 ); Legs with one dorsal trichobothrial row on tarsus and two, dorsal and dorso-retrolateral, on metatarsus and two dorsal on tibia. Tarsal organ without elevation with low and concentric keels ( Fig. 41D View FIGURE 41 ). Palp with one row of trichobothria on tarsus and two on tibia. Abdomen with oval pulmonary opening. Posterior median spinnerets short with spigots on apex, australotheline crescent present. Posterior lateral spinnerets 3-segmented, elongated, apical segment with triangular apex, major ampulate spigots, aciniform spigots and pumpkiniforms spigots present on ventral face. Female palp with one or two ventral spines on tarsus base, tarsal claw with central row of 13̄14 teeth. Male palp: cymbium as wide as long, with short prolateral lobe, tibia with median retrolateral grouped spines or setae ( Fig. 42D View FIGURE 42 , 44E View FIGURE 44 ), absent in S. juruti n. sp. Palpal bulb elongated ( Fig. 42B View FIGURE 42 , 44C View FIGURE 44 ) or dorso-ventrally flattened ( Fig. 43B View FIGURE 43 ̄C). Embolus elongate. Female genitalia: spermathecae bilobed, elongate ( Fig. 42F View FIGURE 42 , Fig. 44E View FIGURE 44 ) or short ( Fig. 43E View FIGURE 43 ̄F). Glandular region short with large glands in ducts ( Fig. 42F View FIGURE 42 , 44F View FIGURE 44 ), except in S. juruti n. sp., not evident ( Fig. 43E–F View FIGURE 43 ).

Species included. Siremata valteri n. sp., S. lucasae n. sp., S. juruti n. sp.

Distribution. Brazilian Amazon region ( Fig. 45).











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