Phlaeopterus olympicus 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-

17. Phlaeopterus olympicus Mullen and Campbell , new species

( Figs. 5A , 14A , 16G , 20C , 24B , 36F ) Zoobank.org/ urn:lsid:zoobank.org:act:7B1AF64C-7E3E-4214-834B-02849F1FA285

Type Locality. Olympic National Park , Washington, USA .

Description. Habitus: Length 6.3–8.2 mm. Dark brown to reddish brown; legs, elytral epipleurae, and palpi brown to reddish brown; elytra often lighter than pronotum ( Fig. 5A ). Head: Width across eyes to head length subequal to slightly wider than long. Interantennal groove broadly and shallowly impressed. Anteocellar foveae large, deeply impressed. Eyes glabrous or with less than 10 setae near ventral margin ( Fig. 36F ). Antennomeres 5–10 at least 2 times longer than wide; antennomeres 4–11 each with many sensory pits with papilliform projections. Ocelli present. Nuchal constriction vague. Mandibular molar area with L-shaped row of setae. Labrum with sensory pores along entire surface. Labial palpi with 3 rd palpomere 1.6–1.8 times longer than palpomere 2. Thorax: Pronotum moderately wide ( Fig. 16G ), length to width ratio = 0.68–0.72; ratio of pronotal width to head width = 1.52–1.59; maximum width subequal to elytral width at humeral angle; punctures on dorsal surface separated by distance equal to diameter of a puncture; lateral margins explanate posterad but not anterad lateral foveae; lateral foveae deeply impressed. Elytra with humeral angles convex; epipleural carina not projecting; 2.2–2.5 times longer than pronotum; apical margins broadly convex. Wings fully developed in most individuals, brachypterous in very few. Mesosternum with projecting tooth; longitudinal carina along midline of mesosternum indistinct ( Fig. 20C ). Legs: Apices of all tibia without pubescence, length of subglabrous apex of metatibia as ratio to metatibial length = 8.3–20.0. Metatrochanter without tooth on apical margin. Abdomen: Wing-folding spicules on tergites IV and V broad, transverse, narrowly separated; tergite VI lacking wing-folding spicules. Aedeagus: Length 1.50–1.60 mm. Median lobe broadly triangular, margins narrowing more sharply nearing apex. Parameres not or barely curved towards apex of median lobe, originating near middle of median lobe ( Fig. 24B ). Internal sac broadly triangular, lightly sclerotized, covered with microspinules.

Type Specimens. Holotype male (UAMObs: Ento:235824) and allotype female (UAMObs: Ento:235825) labeled as follows: WASH. Olympic N.P., 0.5 mi S Lake No. 8 (7 Lakes Basin) 5000’, 16.VIII.1979, J.M. and B.A. Campbell / HOLOTYPE ³ (or ALLOTYPE ♀) Phlaeopterus olympicus , desig. L.J. Mullen and J.M. Campbell, CNC No. 18464 (red label). Both specimens are in the CNC. Paratypes (n = 305) are deposited in the AMNH, CAS, CNC, CSCA, FMNH, MCZ, and USNM.

Distribution. Phlaeopterus olympicus is known only from the Olympic Mountains of Washington State, inside Olympic National Park, and from a single specimen (UAMObs:Ento: 234159) from Harts Pass, Okanagan County, Washington ( Fig. 14A ).

Bionomics. Adults of this species have been collected during July–August at 650–1,970 m elevation, with most specimens collected at 1,500 –1,800 m. Adults have been collected as they were feeding on arthropods on the surface of snowfields at night and during the day under wet rocks and gravel at the edges of snowfields or in moss or wet rocks at the edges of cold streams flowing from snowfields. Some specimens have been collected at lower elevations under stones or in moss along the edges of the Soleduck River or in moss and under stones at the edges of streams draining high-elevation lakes.

Remarks. Phlaeopterus olympicus can be distinguished from all other Phlaeopterus species by the lack of a mesosternal carina but presence of a mesosternal tooth, its pronotal shape, and the glabrous apices of the tibiae. Phlaeopterus olympicus is most similar to P. loganensis , from which it may be distinguished by having the apex of the elytra broadly convex, and by the shape of the aedeagus. Phlaeopterus olympicus and P. loganensis are the only two species of the genus completely lacking a carina along the midline of the mesosternum, although the carina is vague, especially on the posterior half, in other species. Phlaeopterus olympicus has not been collected since 1984, despite three other species having been collected recently from the Olympic Mountains: P. fusconiger as recently as 2014 (UAM:Ento:299528), P. cavicollis as recently as 2008 (UAMObs:Ento:232734), and P. lagrandeuri as recently as 1996 (UAMObs:Ento: 234415).

Etymology. The specific epithet olympicus is derived from the type locality.

Figures

Fig. 5. Phlaeopterus species, habitus. A) P. olympicus, female (UAMObs:Ento:232960), B) P. smetanai, male

Fig. 14. Distributions of Phlaeopterus species based on all georeferenced specimen records. A) P. olympicus, B) P. smetanai. Grey dots represent localities where at least one Phlaeopterus species, but not the species of interest, was collected. Red dots represent localities where the species of interest was collected.

Fig. 16. Pronota, dorsal view, of Phlaeopterus species. A) P. kavanaughi, B) P. castaneus, C) P. cavicollis, D) P.

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. 24. Phlaeopterus species, aedeagi (left = ventral view; right = dorsal view of median lobe). A) P. occidentalis, B) P. olympicus, C) P. loganensis, D) P. fusconiger.

Fig. 36. Phlaeopterus species, eyes, dorsal view. A) P. lagrandeuri, B) P. houkae, C) P. longipennis, D) P. frosti, E) P. bakerensis, F) P. olympicus.