Physocrema Forel

Hosoishi, Shingo & Ogata, Kazuo, 2009, A taxonomic revision of the Asian endemic subgenus Physocrema of the genus Crematogaster (Hymenoptera: Formicidae), Zootaxa 2062, pp. 15-36 : 17-18

publication ID

https://doi.org/ 10.5281/zenodo.186855

publication LSID

lsid:zoobank.org:pub:85FC2E42-200C-4102-899E-5684317234EA

DOI

https://doi.org/10.5281/zenodo.6219385

persistent identifier

https://treatment.plazi.org/id/394D9466-FFC4-FFFC-32E2-08EE2C4A3DB6

treatment provided by

Plazi

scientific name

Physocrema Forel
status

 

The subgenus Physocrema Forel

Physocrema Forel, 1912: 220 [as subgenus of Crematogaster View in CoL ]. Type-species: Crematogaster inflata View in CoL , by subsequent designation of Wheeler 1913: 82.

Physocrema as genus: Soulié, 1964: 398.

Physocrema as junior synonym of Crematogaster: Brown, 1973: 183 View in CoL [provisional]; Smith, D. R. 1979: 1376; Hölldobler & Wilson, 1990: 13.

Physocrema as subgenus of Crematogaster: Forel, 1912: 220 View in CoL ; Forel, 1917: 242; Emery, 1922: 139; Wheeler,W. M. 1922: 662; subsequent authors except those above; Bolton, 1995: 42.

Diagnosis of worker. Head subquadrate, slightly broader than long, with weakly concave posterior margin, angular posterior corners and subparallel sides. Occipital carinae developed. Mandible striate, with four teeth in small workers and five in larger workers, apical and subapical teeth large. Anterior margin of clypeus convex with slightly impressed median portion ( Figs 1, 2 View FIGURES 1 − 2 ); anterolateral margins of clypeus protruded anteriorly, resulting in an appearance of the anterolateral and anteromedian margins being at about the same level ( Figs 1, 2 View FIGURES 1 − 2 ); posterior margin of clypeus rounded between frontal lobes. Frontal carinae almost parallel. Antennae 11 segmented; antennal club 4-jointed. Compound eyes large but not distinctly projecting beyond lateral margins of head in full face view.

Pronotum and mesonotum usually without defined suture, rarely promesonotal suture present in large workers. Mesothoracic spiracle reduced to form small pit dorsoventrally. Variable extent of posterior mesosoma enlarged and swollen ( Figs 3, 4). Metapleural gland opening circular; propodeal spiracle facing posterolaterally ( Figs 3, 4).

Petiole flattened without node nor subpetiolar process; spiracle situated anteriorly midway between dorsal and ventral margins of petiole in lateral view, directed laterally; in dorsal view, elliptical with convex sides, longer than broad (Fig. 5). Postpetiole without distinctly longitudinal median sulcus, weakly bilobed behind in large workers (Fig. 5); spiracle situated distinctly anteriorly on the lateral surface.

Comments. Workers of the subgenus Physocrema can be distinguished from those of all other subgenera of Crematogaster by the features of (1) anteromedian margin of clypeus convex with slightly impressed median portion; (2) anterolateral margins of clypeus produced anteriorly; (3) 4-jointed antennal club (but, 3- jointed in mucronata ); (4) propodeum swollen; (5) metapleural gland orifice circular; (6) petiole elliptical; (7) petiole without node-like process posteriorly. The subgenus is unique among Asian Crematogaster ants in having features (4), (5), (6) and (7). The workers of the subgenus Physocrema share features (1), (2), (3) and (7) with the subgenus Paracrema . In Asian Crematogaster specimens examined, the workers of the subgenera Crematogaster , Decacrema , Mesocrema , Oxygyne , Paracrema , Physocrema and Xiphocrema share features (2) and (7).

Distribution. Southeast Asia: Vietnam (southern parts), Laos, Cambodia, Thailand, Myanmar (southeastern parts), Malaysia (Peninsula and Borneo), Singapore, Indonesia (Sumatra, Mentawai, Java, Bali, Lombok, Kalimantan, Sulawesi, Timor), Philippines ( Fig. 21 View FIGURES 21 – 26 ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Loc

Physocrema Forel

Hosoishi, Shingo & Ogata, Kazuo 2009
2009
Loc

Physocrema

Holldobler 1990: 13
Smith 1979: 1376
Brown 1973: 183
1973
Loc

Physocrema

Soulie 1964: 398
1964
Loc

Physocrema

Wheeler 1913: 82
Forel 1912: 220
1912
Loc

Physocrema

Bolton 1995: 42
Emery 1922: 139
Wheeler 1922: 662
Forel 1917: 242
Forel 1912: 220
1912
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