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Zenodo
2026
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| Online Access: | https://doi.org/10.5281/zenodo.19566335 |
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- <p><b><i>Sierola cylindrica</i> sp. nov.</b></p><p>urn:lsid:zoobank.org:act: 1A8DE82D-D469-4F1F-928B-80EF56CA1004</p><p>Figs 14, 64</p><p><b>Diagnosis</b></p><p>This species resembles some members of the <i>longifacies</i> group such as <i>S. dolichops</i> sp. nov. and <i>S. elongata</i> sp. nov., but is immediately distinguished by the extremely narrow head, which is nearly twice as long as wide. The mesosoma is also compressed, unlike in the <i>longifacies</i> group.</p><p><b>Etymology</b></p><p>Named for the peculiar elongate head, which is hardly wider than deep.</p><p><b>Type material</b></p><p><b>Holotype</b></p><p>AUSTRALIA – <b>Tasmania</b> • ♀; Bellingham Dam, 117 Saltwood Road; 41.0234° S, 147.2119° E; 15 Jan. 2024; S.J. Grove leg.; Malaise trap 2; TMAG F180578.</p><p><b>Description</b></p><p><b>Female</b></p><p>HEAD. Clypeal process very short, almost transverse, extending only slightly beyond lateral portion of clypeus, apex truncate to broadly rounded; dorsally weakly carinate; in profile steep and short, evenly curved. Mandible moderately broad, more or less parallel-sided except at base; not twisted, at most weakly convex outwardly, outwardly coriaceous, somewhat dull; in ventral view evenly, moderately curved. Apex of mandible vertical, with teeth distinctly stronger ventrally. Malar space almost absent. Dorsal setae of head shorter than flagellar width. Frons with sparse, scattered punctures, mostly 3 pit widths apart or more. Vertex and gena setae distinctly longer than frons setae but only about as thick, not particularly conspicuous. Frons microsculpture finely microreticulate, surface weakly matte. Vertex in dorsal view very slightly concave; occipital margin broadly rounded. Lateral ocelli separated from vertex crest by more than their length. Ocellar triangle anterior angle very strongly acute. Head more or less parallel-sided for some distance posterior to eyes. Eye setae short, only about as long as 1–2 ommatidia. Dorsum of head in lateral view nearly flat, head deepest on line well posterior of eye. Venter of head posterior to mandible flat in lateral view, with relatively sparse setae. Head nearly flat ventrally, genal angle absent. Side of head posterior to eye convex. Gena ventral to eye convex; sculpture weakly microreticulate posterior of eye, ventrally with colliculate-coriaceous sculpture. Postgenal depression absent. Antenna short, scarcely extending beyond head.</p><p>MESOSOMA. Strongly dorsoventrally compressed. Anterior margin of dorsal pronotal area in lateral view evenly rounded. Pronotal setae about as long as flagellar width or scarcely longer. Propodeal disc laterally shining, with weak microsculpture; median carina absent; transverse carina absent, brow of declivity broadly rounded; metapleural carinae present posteriorly, fading anteriorly. Profemur only moderately broadened, more than twice as long as wide, strongly laterally compressed, slightly arcuate in dorsal view.</p><p>METASOMA. Shining, with faint microsculpture laterally. S2–5 each with a single sparse apical row of setae. Sixth sternum glabrous medially, with a mix of long and short setae laterally.</p><p>COLOR. Body entirely dark brown to black. Antenna entirely dark brown except ventral side of basal flagellomeres yellowish. Mandible black. Coxae and femora brown, tibiae brown except at base and apex, trochanters and tarsi yellow.</p><p>WINGS. Membrane tinged with yellow. Basal cells of fore wing sparsely setose, with one or two rows of setae in each cell. Cell 1M weakly convex posteriorly, corner posteroapical. Distal portion of vein Rs nearly straight, meeting anterior wing margin at right angle.</p><p>MEASUREMENTS. LFW 1.39 mm; LM 0.68 mm; WH/LH 0.52; DH/LH 0.43; EV/HE 1.47; EV/WF 1.79; WF/HE 0.82; WH/WF 1.79; OOL/WOT 3.31; DM/LM 0.30; FL/FW 2.33; HFL/HFW 2.30; A3 L/ W 1.23; 2R1 L/ W 2.63.</p><p><b>Distribution</b></p><p>Tasmania; known only from the holotype.</p><p><b>Remarks</b></p><p>The very narrow head is the most extreme known in the genus. The OOL/WOT ratio is likewise the highest known; only a few others even approach 3.0.</p>