Phlaeopterus elongatus Mullen and Campbell, 2018

Mullen, Logan J., Campbell, J. M. & Sikes, Derek S., 2018, Taxonomic Revision of the Rove Beetle Genus Phlaeopterus Motschulsky, 1853 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini), The Coleopterists Bulletin 72, pp. 1-1 : 1-

5. Phlaeopterus elongatus Mullen and Campbell , new species

( Figs. 2A , 8A, 17E, H , 20F , 25D , 29C , 37J–K , 39E–F , 41C , 42F ) Zoobank.org/ urn:lsid:zoobank.org:act:6D8522FE-F60F-4086-98BA-CEE3411A5F18

Type Locality. Yoho National Park , British Columbia, Canada .

Description. Habitus: Length 4.8–6.4 mm. Dark brown to black; tarsi, apex of tibiae, and antennae often lighter, reddish brown to dark brown ( Fig. 2A ). Head: Moderately narrow, ratio of width across eyes subequal to length of head (Fig. 59). Interantennal groove shallowly impressed. Anteocellar foveae large, deeply impressed. Eyes glabrous or with less than 10 scattered setae near ventral margin. Antennomeres 5–10 at least 2 times longer than wide; antennomeres 4–11 each with many sensory pits with papilliform projections ( Fig. 37J–K ). Ocelli present. Nuchal constriction vague. Mandibular molar area with L-shaped row of setae ( Fig. 29C ). Maxilla as in Fig. 39E–F . Hypopharynx as in Fig. 41C . Labrum with sensory pores along entire surface. Labial palpi with 3 rd palpomere 1.6–1.8 times longer than palpomere 2. Gula as in Fig. 42F . Thorax: Pronotum narrow ( Fig. 17E ), length to width ratio = 0.88–0.95; ratio of pronotal width to head width = 1.27–1.41; maximum width less than elytral width at base;

bakerensis , E) P. smetanai , F) P. occidentalis , G) P. olympicus , H) P. loganensis .

punctures on dorsal surface separated by average distance slightly greater than diameter of a puncture; without vague impression near midline on ventral surface (as in P. filicornis ); lateral margins deflexed posterad and anterad lateral foveae; lateral foveae vague, contiguous with and somewhat obscured by deflexed lateral margin. Elytra with humeral angles convex; epipleural carina not projecting; 2.4–2.7 times longer than pronotum; apical margins sexually dimorphic, broadly convex in males but somewhat prolonged at suture in females. Wings fully developed in most individuals, brachypterous in very few. Mesosternum with projecting tooth; longitudinal carina along midline of mesosternum complete but vague ( Fig. 20F ). Legs: Apices of all tibiae glabrous, length of subglabrous apex of metatibia as ratio to metatibial length = 6.1–11.5. Metatrochanter without tooth on apical margin. Abdomen: Wing-folding spicules on tergites IV and V broad, transverse, nearly contiguous; tergite VI with small, nearly circular wing-folding patches ( Fig. 17H ). Aedeagus: Length 0.90–1.05 mm. Median lobe triangular, apex somewhat acute ( Fig. 25D ). Parameres nearly straight. Internal sac expanded at base; moderately sclerotized; evenly covered in microspinules.

Type Specimens. Holotype male (UAMObs: Ento :235834) and allotype female (UAMObs: Ento: 235835) labeled as follows: Alta., 20 mi. SW Kananaskis F.E. S. [Forest Experiment Station], 7000’, Snow Ridge, VII-31-1971, J.M. & B.A. Campbell / Holotype ³ (or Allotype ♀) Phlaeopterus elongatus , desig. L.J. Mullen and J.M. Campbell, CNC No. 18462 (red label). Both specimens are deposited in the CNC. Paratypes (n = 122) deposited in the AMNH, CAS, CNC, CSCA, FMNH, MCZ, and USNM.

Distribution. Phlaeopterus elongatus is known from the Rocky Mountains from Wyoming north to Summit Lake, British Columbia, in the Cascade Range and Selkirk Mountains of British Columbia, and the Alaska Range and Talkeetna Mountains of Alaska ( Fig. 8A).

Bionomics. Adults have been collected at 1,100–3,200 m elevation during June–September from particularly cold habitats, including the edges of snowfields, lakes fed by melting snow, and sometimes from wet moss in the splash zones of waterfalls or the edges of streams. Unlike other new species described herein that have not been re-collected since the late 1970s or early 1980s, we collected P. elongatus extensively in the Alaska Range and Talkeetna Mountains during the summers of 2013–2014, suggesting these populations are persisting in Alaska .

Remarks. Phlaeopterus elongatus can be distinguished from all other Phlaeopterus species by its elongate form, especially narrow pronotum, and the presence of wing-folding spicules on tergite VI. This species has been misidentified as P. filicornis in most collections but can be differentiated from P. filicornis by the aforementioned characters as well as its smaller size, darker color, shallower interantennal groove, longer glabrous region of the mesotibia, and aedeagus with a narrower median lobe.

Etymology. The name of this species is derived from the Latin elongate, referring to the particularly elongate shape of the body.

Figures

Fig. 2. Phlaeopterus species, habitus. A) P. elongatus, male (UAMObs:Ento:232543), B) P. filicornis, female

Fig. 17. Phlaeopterus species. Pronota, dorsal view, of A) P. fusconiger, B) P. frosti, C) P. filicornis, D) P. hatchi, E) P. elongatus. Abdominal segments 4–6, dorsal view, of F) P. houkae, G) P. obsoletus, H) P. elongatus.

Fig. 20. Phlaeopterus species, mesosterna, ventral oblique view. A) P. longipennis, B) P. obsoletus, C) P. olympicus, D) P. frosti, E) P. occidentalis, F) P. elongatus.

Fig. 25. Phlaeopterus species, aedeagi (left = ventral view; right = dorsal view of median lobe). A) Phlaeopterus frosti, B) P. hatchi, C) P. filicornis, D) P. elongatus.

Fig. 29. Phlaeopterus species. Right mandibles, ventral view, of A) P. obsoletus, B) P. bakerensis, C) P. elongatus. D) P. bakerensis, humeral angle of elytron, dorsal view. Apices of elytra of E) P. loganensis, F) P. hatchi, G) P. filicornis female.

Fig. 37. Sensory structures on antenna of A) Lesteva pallipes, B–C) Lesteva pubescens, D–E) Unamis sp. undescribed, F–G) Phlaeopterus houkae, H–I) Phlaeopterus obsoletus, J–K) Phlaeopterus elongatus. In B, D, F, H, and J, white boxes indicate inset area that is magnified in the image to the right.

Fig. 39. Phlaeopterus species, maxillae, dorsal and ventral views. A–B) P. houkae, C–D) P. obsoletus, E–F) P. elongatus.

Fig. 41. Phlaeopterus species, hypopharynges, dorsal view, of A) P. obsoletus, B) P. kavanaughi, C) P. elongatus. D) Phlaeopterus lagrandeuri, metatrochanter with apical tooth. Heads, ventral view, of E) Lesteva pallipes, F) Lesteva pubescens.

Fig. 42. Heads, ventral view, of A) Unamis sp. undescribed, B) Unamis sp., C) Phlaeopterus lagrandeuri, D) Phlaeopterus houkae, E) Phlaeopterus longipennis, F) Phlaeopterus elongatus.