Siamoglaris theresiae, Lienhard & Ch-, 2011

Lienhard, Charles, 2011, A new species of Siamoglaris from Thailand with complementary description of the type species (Psocodea: ‘ Psocoptera’: Prionoglarididae), Revue suisse de Zoologie 118 (2), pp. 293-306 : 294-295

Siamoglaris Lienhard, 2004

Lienhard, 2004: 866. Type species: Siamoglaris zebrina Lienhard, 2004: 866 . Other species included: Siamoglaris theresiae sp. n. (see description below).

REVISED DIAGNOSIS: See original diagnosis by Lienhard (2004), with the following additions or modifications. Habitus as shown in Fig. 1. Membranous extension of anterior preapical claw of each leg somewhat variable in size (Fig. 5e and Lienhard, 2004: fig. 5; see also Discussion below). Male terminalia (Figs 4a-c, 5f-g, 6c-e): Mediointernal structure of posterior part of phallosome not differentiated as a simple slender process like in Prionoglaris (see Lienhard, 1988, 1998), but as a relatively wide and weakly sclerotized internal tube bearing distally the opening of the ejaculatory duct and various membranous or sclerotized eversible structures of specific shapes. Female terminalia (Figs 2-3): In general similar to Prionoglaris (Fig. 7), but ovipositor valvulae and paraprocts lacking hooked stout setae and basal part of epiproct lacking pilosity. Ventral and dorsal gonapophyses almost completely reduced. External gonapophyses well-developed, basally rounded, apically angulate, pilose; besides normal pilosity bearing also numerous thin-walled broadened papilliferous setae (Figs 2b, 3). Some such setae also present in ventral half of paraproct (Fig. 3a). Subgenital plate short and simple, its posterior margin forming a wide angle but lacking a distinct medio-apical lobe. Spermapore region simple.

DISCUSSION: The shape of the membranous part of the anterior preapical claws is somewhat variable (partially due to different degrees of swelling after slidemounting of the legs). Contrary to Lienhard (2004: key on p. 871) no clear difference between Siamoglaris and Prionoglaris could be observed in this character (see Figs 5e and 7b). The internal basal bristle of the anterior pretarsal claws is also present in Prionoglaris (Fig. 7b), but usually it is very short and fine, difficult to distinguish from adjacent microtrichia; therefore it has not previously been recognized by Lienhard (1988: fig. 8; 1998: fig. 39e). The other differences between these two genera mentioned by Lienhard (2004) could be confirmed. However, in Prionoglaris the posterior parts of the phallosome are more heavily sclerotized than in Siamoglaris and no eversible structures have been observed. The opening of the ejaculatory duct is hardly visible in Prionoglaris , probably it is situated just dorsally of the base of the medioventral process near the base of the mediointernal process (see figures in Lienhard, 1988, 1998). Lienhard (2004) has tentatively interpreted the presence of a pair of sclerotized hooked claspers apically on the eversible posterior parts of the phallosome as a generic character of Siamoglaris , but the new material shows that this character is only present in the type species.

The female genitalia of Siamoglaris are similar to those of the other prionoglaridine genera ( Prionoglaris : Fig. 7e; Speleopsocus : see Lienhard et al., 2010a: fig. 3b). The presence of special papilliferous setae on female terminalia of S. zebrina is here tentatively interpreted as an autapomorphy of the genus Siamoglaris (see also Discussion of the type species, below). The female of the monotypic Neotropical genus Speleopsocus , the male of which is still unknown, can easily be distinguished from Siamoglaris by several striking characters, as indicated by Lienhard et al. (2010a). The discovery of the female of Siamoglaris does not provide significant new information for a better understanding of phylogenetic relationships between the three genera of Prionoglaridinae. The trichotomy in this subfamily remains unresolved (see Lienhard et al., 2010a). At present it seems that only molecular data (DNA analysis will be undertaken by Kazunori Yoshizawa, Sapporo) or the discovery of the male of Speleopsocus can bring some progress in this field.