Navigator

Moeseneder, Christian H. & Hutchinson, Paul M., 2016, Navigator, a new endemic genus of Cetoniinae (Coleoptera: Scarabaeidae) from Australia, with descriptions of two new species and behavioural studies, Zootaxa 4173 (6), pp. 530-556 : 536

Key to the species of Navigator

Prerequisite for the use of this key is sex determination of the specimen. In males of N. fossor , N. ruficornis , and N. pixii ( N. interior not yet known), males have a longitudinal abdominal impression or flat sternites, antennal club length longer than antennomeres 1–7, and non-spatulate metatibial internal spur. Females of all Navigator species have medially convex sternites, antennal club length equal to or less than antennomeres 1–7, and spatulate metatibial internal spur.

1 Preclypeus shallow ( Fig. 1 A, detail 5 and cross-section 6); clypeal lateral declivity absent ( Fig. 1 A, details 2, 7). Female abdominal sternites distended ( Fig. 1 E, detail 1); disc of pygidium visible in dorsal view ( Fig. 1 D, detail 8)............... 2

– Preclypeus deep ( Fig. 1 B, detail 2 and cross-section 3); clypeal lateral declivity present ( Fig. 1 B, details 1 and 4). Female abdominal sternites not distended; pygidium not well visible in dorsal view ( Fig. 1 D, detail 9)......................... 3

2 Male metatibia internal margin with longitudinal setose groove, apex unispinose ( Fig. 1 K, detail 1). Metacoxa posterolateral angle angulate ( Fig. 1 G, detail 1). Male size 9.6–11.7 mm. Female 12.5–14 mm, ovoid. From southeastern Queensland .......................................................................... N. pixii Moeseneder & Hutchinson, 2016

– Male metatibia internal margin not grooved, apex trispinose ( Fig. 1 H, detail 3). Metacoxa posterolateral angle broadly arcuate ( Fig. 1 G, detail 2). Male size 14.8–16.2 mm. Female 16.8–18.9 mm, elongate ovoid. From Western Australia ................................................................................................. N. fossor ( Lea, 1914)

3 Metatibia with large, median denticle ( Fig. 1 I, detail 1). Metacoxa posterolateral angle angulate ( Fig. 1 G, detail 1)..................................................................................... N. ruficornis ( Westwood, 1874)

– Metatibia with small, median denticle ( Fig. 1 J, detail 1). Metacoxa posterolateral angle spinose ( Fig. 1 G, detail 3)........................................................................... N. interior Moeseneder & Hutchinson, 2016

Figures

FIGURE 1. Navigator characters. A—characters of the head (example N. pixii male): A 1 — margins laterally divergent, A 2 — head widest preapically, A 3 — shallow arcuate to linear anterior margin, A 4 — gradually inclined margins, A 5 — shallow preclypeus, A 6 — cross-section, A 7 — lateral declivity absent. B—characters of the head (example N. ruficornis female): B 1 — lateral declivity present, B 2 — deep preclypeus, B 3 — cross-section, B 4 — lateral declivity present. C—characters of the pronotum (example N. pixii male): C 1 — concave linear basolateral margin, C 2 — broad median angle of lateral margins, C 3 — coarsely punctate disc. D—characters of the elytra (example N. pixii male, except D 9): D 1 — weakly sinuate-linear posthumeral arch, D 2 — slightly exposed metacoxa, D 3 — elytral basal half parallel sided, D 4 — apical half of elytra broadly arcuate to apex, D 5 — slightly protruding mesepimeron, D 6 – 7 — indistinctly raised apical umbone, D 8 — visible pygidium D 9 — pygidium not well visible (example N. ruficornis). E—characters of the female abdomen: E 1 — distinctly convex and distended sternites, E 2 — pygidium in normal plane (example N. ruficornis), E 3 — pygidium in elevated plane (example N. pixii). F—character of the abdomen: F 1 — undeveloped mesometasternal process. G—metacoxa posterolateral angle: G 1 — angulate (examples N. pixii and N. ruficornis), G 2 — broadly arcuate (example N. fossor), G 3 — spinose (example N. interior). H – K: characters of the metatibia: H— Navigator fossor female: H 1 — spatulate internal spur, H 2 — unidentate, H 3 — trispinose apex. I— Navigator ruficornis female: I 1 — large, median denticle, I 2 — trispinose apex. J— Navigator interior female: J 1 — small, median denticle. K— Navigator pixii male: K 1 — unispinose apex. Note: cross-sections in A and B are from clypeal anterolateral angle to clypeolateral margin, not in transverse axis.