Aphaenogaster poultoni Crawley

Shattuck, Steven O, 2008, Australian ants of the genus Aphaenogaster (Hymenoptera: Formicidae), Zootaxa 1677, pp. 25-45 : 40-41

Aphaenogaster poultoni Crawley

(Figs 6, 13, 14, 19, 20, 29)

Aphaenogaster poultoni Crawley, 1922b: 17 .

Types. Worker syntypes (10 in WAMP, examined) from Beenup [?=Beenyup Brook or Beenyup Swamp], Western Australia; 1 worker syntype without locality data in MVMA.

Diagnosis. Majority of hairs on venter of head located laterally and forming a distinct psammophore ( Fig. 14 ); eye relatively small (EI less than 21, Fig. 19 ); scape relatively short (SI less than 106, Fig. 20 ); mandibular sculpture composed of irregularly sized striations (Fig. 6); petiolar node (in dorsal view) wider than long. This species is most similar to A. barbigula . These two species can be separated by the pattern of sculpturing on the mandibles and the shape of the petiolar node.

There is a tendency for the head of A. poultoni to be more square (when viewed in full face view, the lateral and posterior margins are separated by an angle) compared to both A. barbigula and A. mediterrae (in which the head is essentially uniformly arched behind the eyes in full face view). However, all species show moderate variation in the shape of the head with essentially identical morphologies being found in some individuals of all three species. Thus while this character is indicative of A. poultoni it is not diagnostic.

Description. Posterior margin of head nearly flat in full face view, extending laterally of the occipital collar before passing through a distinct posterolateral corner into the lateral margin of the head. Majority of hairs on venter of head located laterally and forming a distinct psammophore, only scattered hairs on central portion. Mandibular sculpture composed of irregularly sized striations. Erect hairs on mesosomal dorsum tapering to sharp points. Propodeal spines reduced to small denticles or sharp angles. Petiolar node (in dorsal view) wider than long;

Measurements. Worker (n = 11). CI 86–98; EI 16–21; EL 0.16–0.22; HL 0.93–1.28; HW 0.85–1.18; ML 1.30–1.86; MTL 0.68–1.00; SI 90–105; SL 0.85–1.16.

Material examined (in ANIC unless otherwise noted). Western Australia: 100km E Norseman (Lowery,B.B.); 10km S Mullewa (Lowery,B.B.); 10mi. W Mullewa (Riek,E.F.); 160km ENE Esperance (Ward,P.S.) ( ANIC, PSWC); 180km N Geraldton, nr. Billabong Roadhouse (Lowery,B.B.); 20km S Norseman (Lowery,B.B.); 20km W York (Lowery,B.B.); 26mi. NWbyW Norseman (Taylor,R.W.); 3.2km SSW Dongara (Feehan,J.E.); Beenup [Beenyup] (Clark,J.); Beyerley (du Boulay,F.H., MCZC); Brookton Hwy, 20km E Boulders (Lowery,B.B.); Bungulla (Greaves,T.); Caron (Darlington,P.J., MCZC); Darlington (Glauert,G., MCZC); Geraldton (Lowery,B.B.; Mercovich,C.T.; Weatherill; Wheeler,W.M. ( ANIC, MCZC); Gayamin Pool, Lower Chittering (Wilson,E.O. and Douglas,A., MCZC); Israelite Bay (T.G.); Kalbarri Nat. Park (Lowery,B.B.); Kings Park, Perth (Clark,J., Lowery,B.B.) ( ANIC, MCZC); Moora (Lowery,B.B.); Mullewa (Wheeler,W.M., MCZC); National Park, Darling Range (Wheeler,W.M., MCZC); Perth (Clark,J.; Greaves,T.; Keirath,A.R.) ( ANIC, MCZC); Perth, Kings Park (Lowery,B.B.); Rockingham (Glauert,L., MCZC); Toodyay (Lowery,B.B.); Toolinna (Brooker,M.G.); Woongondy, 300mi. N Perth (Mercovich,C.T.).

Comments. This species is restricted to a narrow semi-arid band across south-western Western Australia ( Fig. 29 ) and is sympatric with A. mediterrae in south-central Western Australia (see Fig. 28 ). It is found in coastal scrub, Jarrah forests, dry sandy sclerophyll, mulga woodlands and mallee. Nests are in soil generally with a large crater at the entrance. An exceptionally large mating swarm was noted by McMillan (1977) (as A. barbigula ).

Figures

FIGURES 13 – 18. A. poultoni Crawley, worker: Fig. 13, front of head; Fig. 14, lateral view of body. A. pythia Forel, neotype worker: Fig. 15, front of head; Fig. 16, lateral view of body. A. reichelae sp. n., holotype worker: Fig. 17, front of head; Fig. 18, lateral view of body.

FIGURES 19 – 20. Fig. 19, eye length versus head width measurements for A. barbigula, A. mediterrae and A. poultoni; Fig. 20, scape length versus head width measurements for A. barbigula, A. mediterrae and A. poultoni.

FIGURES 24 – 29. Distribution of material examined during this study: Fig. 24, A. barbara; Fig. 25, A. barbigula; Fig. 26, A. kimberleyensis; Fig. 27, A. longiceps; Fig. 28, A. mediterrae; Fig. 29, A. poultoni.