Striamea Raven, 1981

Passanha, Victor & Brescovit, Antonio D., 2018, On the Neotropical spider Subfamily Masteriinae (Araneae, Dipluridae), Zootaxa 4463 (1), pp. 1-73 : 56

Striamea Raven, 1981

Striamea Raven, 1981: 57 . Type species by original designation, Striamea gertschi .

Diagnosis. Species of Striamea differ from the other genera of Masteriinae in having a color pattern on carapace and abdomen ( Fig. 34B ), elevated ocular tubercle ( Fig. 34A ), one row of trichobothria on the metatarsi, teeth of inferior tarsal claw emerging from a projected base ( Fig. 35A–B ) and australotheline crescent absent ( Fig. 35D ).

Description. Complementary description of Raven (1981): Small sized mygalomorph spiders, total length (3.30–8.98). Carapace with thoracic and abdominal pattern, with stripes and spots ( Fig. 34A–B ). Ocular tubercle wider than long, projected. Endites without cuspules, with linear serrula on apical border ( Fig. 36A ). Three tarsal claws ( Fig. 35A–B ). Trichobothria with corrugated bases ( Fig. 36D ), one row on tarsi and metatarsi, and two rows on tibiae. Tarsal organ without elevation with low and concentric keels ( Fig. 36B ). Metatarsus I with apical ventral megaspine ( Fig. 35C ). Palpal tibia with apical retrolateral spines, short apical ventral depression ( Fig. 37A–C ). Palpal bulb without paraembolic apophysis. Posterior median spinnerets without australotheline crescent ( Fig. 35D ). Female genitalia with unilobed spermathecae and small glandular region ( Fig. 37F–G ).

Note. After analysis of type material of Striamea gertschi we found an apical megaspine on metatarsus I of the male, differing from the diagnosis proposed by Raven (1981). The leg I, endites and palp of the holotype were used by the author in SEM, we repeat the process for SEM, confirming the megaspine seen on stereomicroscope.

Species included. Striamea gertschi Raven, 1981 , S. magna Raven, 1981 .

Distribution. Only at Sierra Nevada de Santa Marta, Magdalena, Colombia.

Figures

FIGURE 34. Striamea spp., color pattern, (holotypes, AMNH). A Striamea magna, female, Carapace, dorsal view. B Striamea gertschi, male, dorsal view. Scale bar: A, B, 1mm.

FIGURE 35. Striamea spp. (Holotype, AMNH). A Striamea gertschi, male tarsal claws, lateral view; B inferior tarsal claw, lateral view; C S. gertschi, male, apical ventral megaspine on tibia I (right leg, proventral view); D Base of posterior median spinneret. Abbreviations: MR, membranous region; A, abdomen. Scale bar: A, 50µm; B, 10µm; C, 100µm; D, 40µm.

FIGURE 36. Striamea gertschi Raven, 1981, male (Holotype, AMNH). A Serrula, lateral view. B Tarsal organ, dorsal view. C Ventral depression of male palp, prolateral view. D Trichobothria on male palp, dorsal view. Scale bars: A 50µm; B 5µm; C 50µm; D 5µm.

FIGURE 37. Striamea gertschi Raven, 1981. (Holotype male and paratype female, AMNH). A–E, male. A Palpal bulb, prolateral view; B Embolus tip, prolateral view; C Apical spines on palpal tibia, prolateral view; D Apical ventral megaspine on male tibia I (right leg, proventral view); E Group of microspines on tibia I, prolateral view; F, G Female genitalia, dorsal view. Abbreviation: VD, ventral depression. Scale bar: A 50µm; B 20µm; C 50µm; D 100µm; E 40µm; F, G 100µm.