cf. Parahistricostoma tuberculatum (C. L. Koch & Berendt, 1854)

Figs 25–27

Material examined.. UKRAINE: SIZK UA- 1565, Rovno amber, precise locality unclear; late Eocene. Syninclusions: none.

Description. A juvenile covered by a white emulsion concealing the dorsal granulation and the armature of the scutum (Fig. 25). With L: 0.50; prosoma width: 0.27; abdomen width: 0.28; ocular tubercle elliptic (Fig. 26), with length: 0.06 and width: 0.08; diameter of each lens 0.03; Palps with article lengths: Fe: 0.308; Pa: 0.238; Ti: 0.238; Ta: 0.14. Palpal articles (except trochanters) ventrally with clavate setae (L: 0.056) (see Figs 26–27). The tarsus of each leg is one-segmented (Fig. 25) with a length of: Ta I: 0.28; Ta II.–IV.: 0.25, respectively.

Remarks. Given the shape of the ocular tubercle, the proportions of the pedipalps, and the shape of their segments, this juvenile most probably belongs to Parahistricostoma tuberculatum, too. The length of the body, the single tarsal segments and their length, indicate that this juvenile nemastomatid, by analogy with other extant nemastomatid species, could be the first or the second juvenile stage (cf. Immel 1954: figs 8, 10).