Crematogaster schimmeri, FOREL, 1912 a

Hosoishi, Shingo & Ogata, Kazuo, 2016, Systematics and biogeography of the ant genus Crematogaster Lund subgenus Orthocrema Santschi in Asia (Hymenoptera: Formicidae), Zoological Journal of the Linnean Society 176 (3), pp. 547-606 : 596-597

CREMATOGASTER SCHIMMERI FOREL, 1912a

( FIG. 118 )

Crematogaster schimmeri Forel, 1912a: 69 ;

syntype workers, Pilam, Taiwan (H. Sauter) ( MHNG, examined) . One syntype worker (middle specimen of three on one pin) in MHNG here designated Lectotype.

Crematogaster schimmeri ; Emery, 1922: 132 [Combination in C. ( Decacrema )].

Crematogaster schimmeri ; Terayama, 2009: 177 [Combination in C. ( Decacrema )].

Crematogaster schimmeri ; Hosoishi & Ogata, 2009a: 1 [Combination in C. ( Orthocrema )].

Crematogaster schimmeri ; Blaimer, 2012c: 55 [Combination in C. ( Orthocrema )].

Crematogaster schimmeri ; Peeters et al., 2013: 258, figs 2–4 [External and internal morphology of intermediate worker].

Worker measurements (n = 5): HW 0.44–0.48; HL 0.45– 0.49; CI 96–98; SL 0.38–0.40; SI 79–87; EL 0.12– 0.13; PW 0.29–0.32; WL 0.50–0.54; PSL 0.08–0.10; PtL

0.14–0.17; PtW 0.15–0.17; PtH 0.11–0.14; PpL 0.11– 0.12; PpW 0.16–0.18; PtHI 75–82; PtWI 88–107; PpWI 142–150; WI 107–113.

General description of worker: Workers monomorphic.

Head subquadratic in full-face view. Mandibles with four teeth arranged at an equal distance, apical and subapical teeth large, basal two teeth smaller. Anterior clypeal margin weakly convex in medial portion. Compound eyes distinctly projecting beyond lateral margins of head in full-face view. Scapes reaching posterolateral corners of head.

Pronotal collar with almost straight anterior margin in dorsal view, distinctly lower than pronotum in lateral view. Pronotal dorsum with ridges laterally. Mesonotal dorsum with lateral ridges. Pronotum and mesonotum in lateral view not clearly forming continuous dorsal outline. Metanotal groove in dorsal view transverse, almost straight in median portion, forming deep concavity that is laterally margined by lamellate ridges. Propodeal spiracles oval, situated at posterolateral corners of propodeum, touching metapleural gland bullae. Propodeal spines developed, longer than diameter of propodeal spiracles, in dorsal view directed posteriad.

Petiole in dorsal view with parallel sides and angulate shoulders anteriorly, longer than wide. Posterior portion of petiole with short process that is slightly higher than posterior margin of petiole disc in lateral view. Subpetiolar process developed as blunt process. Postpetiole in lateral view with weakly convex dorsum, as high as petiole, in dorsal view slightly wider than petiole, weakly bilobed posteriorly but without longitudinal sulcus. Subpostpetiolar process developed as acute process.

Integument essentially sculptured. Dorsal surface of head weakly sculptured reticulately. Mandibles with feeble rugulae and smooth interspaces. Clypeus weakly sculptured with longitudinal rugulae; longer rugulae extending to posterior clypeal margin. Anterolateral shoulders of pronotum with rugulae. Lateral surface of pronotum sculptured in higher portion, but relatively smooth and shining in lower portion. Pronotum and mesonotum with longitudinal rugulae and sculptured interspaces. Mesopleura sculptured, but relatively smooth in central areas. Rugula on higher portion of mesopleura extending to small pit of mesothoracic spiracles. Dorsal surface of propodeum sculptured. Dorsal and lateral surfaces of petiole sculptured. Dorsal and lateral surfaces of postpetiole sculptured.

Standing pilosity sparse. Dorsal face of head with several pairs (c. 9) of erect and stout long setae, and short and decumbent setae sparsely. Clypeus with two pairs of long setae in anterior portion, one directed upward and the other downward. Anterior clypeal margin with one pair of long setae medially and some pairs (three to four) of short setae laterally. Scapes with decumbent to appressed setae. Mesosoma with five pairs of long erect and stout setae (ps1PN, ps2PN, psaMN, pspMN, and ps2PS) that are much longer than other erect setae. Posterolateral tubercles of petiole posteriorly with one pair of stout long setae. Postpetiole with three pairs of stout long setae on disc anterodorsally, anterolaterally and posteriorly. Fourth abdominal tergite with several pairs (c. 12) of erect and stout setae, and short appressed setae sparsely.

Body yellow. All flagellar segments yellow.

Comments: In the worker this species can be distinguished from all other members of the C. biroi group by the distinct compound eyes, sculptured dorsal surface of head, and petiole squared with angulate anterolateral corners. This species is similar to C. reticulata , but can be distinguished from it by the propodeal spiracles touching metapleural gland bulla and squared petiole with angulate anterolateral corners.

Terayama (2009) assigned this species to the subgenus Decarema by having 10-segmented antennae. However, examinations of the type specimens reveals that the species has 11-segmented antennae and belongs to the subgenus Orthocrema ( Hosoishi & Ogata, 2009a) .

Distribution: This species is known only from the type locality in Taiwan ( Fig. 51 ).

Figures

Figure 51. Geographical distribution of the species of the C. biroi group.

Figures 112–119. Body in lateral view. 112, Crematogaster osakensis, worker [Hiraodai Karst Plateau, Fukuoka, Japan]; 113, Crematogaster philippinensis, worker [Mt. Mayon, Luzon Island, Philippines]; 114, Crematogaster quadriruga, worker [Lum Jang Wat, E, Thailand]; 115, Crematogaster quadriruga, intermediate worker [PSU forest, Hat Yai, Songkhla Prov., S. Thailand]; 116, Crematogaster reticulata, worker [Ulu Gombak, Selangor, W. Malaysia]; 117, Crematogaster reticulata, intermediate worker [Datfa Waterfall, Tai Rom Yen National Park, Surat Thani Prov., S. Thailand]; 118, Crematogaster schimmeri, worker [Pilam, Taiwan]; 119, Crematogaster storki, worker [Dumoga-Bone National Park, Utara, Sulawesi, Indonesia].