A taxonomic revision of the Asian endemic subgenus Physocrema of the genus Crematogaster (Hymenoptera: Formicidae)
Author
Hosoishi, Shingo
Author
Ogata, Kazuo
text
Zootaxa
2009
2062
15
36
journal article
41180
10.5281/zenodo.186855
23f6f46c-8a7c-48de-81e7-1adcf43ecbc6
1175-5326
186855
85FC2E42-200C-4102-899E-5684317234EA
Crematogaster
(
Physocrema
)
sewardi
Forel
(
Figs 9
,
17
,
29
)
Crematogaster deformis
r.
sewardi
Forel, 1901
: 64
.
LECTOTYPE
worker (top specimen of two on one pin) (by present designation) and one
paralectotype
worker and queen from
MALAYSIA
: Borneo (
H. Seward
) (MHNG) [examined]. Combination in
C
. (
Physocrema
) by
Emery, 1922
: 140
. Raised to species by
Hosoishi & Ogata 2008
: 7
.
Measurements and indices.
HW 0.85–1.32; HL 0.77–1.22; CI 105–111; SL 0.70–0.96; SI 72–83; EL 0.16–0.24; PW 0.51–0.74; WL 0.96–1.40; PSL 0; PtL 0.28–0.42; PtW 0.21–0.36; PtH 0.15–0.22; PpL 0.19–0.28; PpW 0.23–0.34; PtHI 52–57; PtWI 74–86; PpWI 113–129; WI 94–116 (Three workers measured).
Description of worker.
Workers with pronounced size polymorphism.
Scape not reaching posterior corner of head in large workers.
In lateral view, dorsal profile of promesonotum convex; propodeum distinctly raised relative to promesonotum. Anterior margin of pronotal collar slightly concave in dorsal view. Metanotal groove convex posteriorly in dorsal view in large workers, deep and situated posteriorly to the posterior ridge of pronotum in lateral view; thorax strongly constricted in middle in dorsal view. In dorsal view, some longitudinal rugulae connecting between mesonotum and propodeum; the boundary distinct. Propodeal spiracle situated away from the metapleural gland orifice, the distance between them much greater than the propodeal spiracle diameter. Propodeal spines absent.
Clypeus sculptured with longitudinal rugulae.
Standing pilosity sparse on dorsal face of head, abundant on promesonotum. Dorsal face of head with decumbent setae. Clypeus with short setae. Fourth abdominal tergite with appressed setae. Dorsal setae on fourth abdominal tergite directed posteriorly.
Body color black.
Distribution.
Crematogaster
(
P
.)
sewardi
is the most wide-ranging species of the subgenus
Physocrema
(
Fig. 29
). This species ranges from
Thailand
to
Malaysia
(Peninsula and Borneo) and to
Indonesia
(Kalimantan, Sumatra, Krakatau Island, Java, Bali and Lombok).
Remarks.
This species is very similar to
C
. (
P
.)
ampullaris
, but can be distinguished by the dorsal outline of the mesosoma and the depth of the metanotal groove.
The MHNG
syntypes
were lighter colored than normal, but otherwise match the characters of the specimens examined.
Among the
Physocrema
species,
C
. (
P.
)
ampullaris
,
C
. (
P.
)
difformis
, and
C
. (
P.
)
sewardi
are very similar to each other.
Crematogaster
(
P.
)
sewardi
is widely distributed in South
East Asia
, but almost all have been referred to as
C
. (
P.
)
difformis
in the past. It is also likely that
C
. (
P.
)
sewardi
has been misidentified as
C
. (
P.
)
difformis
in the literature (
Attygalle
et al.
1989
;
Gay & Hensen, 1992
;
Ito
et al.
2001
;
Jaitrong & Nabhitabhata, 2005
;
Jones
et al.
2005
). Based on the key above,
C
. (
P
.)
difformis
can be easily distinguished from
ampullaris
and
sewardi
, but as revealed above, the latter two species are very similar to each other and have been frequently confused.
Crematogaster
(
P
.)
difformis
and
C
. (
P
.)
sewardi
are geographically sympartric in the Malay Peninsula and Borneo, whereas
C
. (
P
.)
ampullaris
and
C
. (
P
.)
sewardi
are allopatric.
Crematogaster
(
P
.)
ampullaris
is found in Sulawesi, Timor and
Philippines
, and
C
. (
P
.)
sewardi
in Indochina, Malay Peninsula, Borneo, Sumatra, Krakatau Island, Java, Bali and Lombok. The slight morphological differences and allopatric distribution may imply that the two species are relatively new taxa.
Specimens examined.
THAILAND
:
6 workers
, Sakaerat lowland forest (DEF), Nakornratchasima,
10. vii. 1999
(
Sk. Yamane
);
6 workers
, Nam Tok Philio NP (
300–500m
alt.), Chanthaburi Prov.,
22. xi. 2003
(
Sk. Yamane
);
4 workers
, Khao Soi Dao, W. S., Chanthaburi Prov.,
19. vii. 1997
(
H
.
Okido
);
4 workers
, Khao Soi Dao, W. S., Chanthaburi Prov.,
19. vii. 1997
(
Sk. Yamane
);
2 workers
, Khao Chong (river side), Trang Prov.,
24. viii. 1998
(
Sk. Yamane
)
MALAYSIA
:
11 workers
,
7miles
,
Cameron
Highland,
9. iii. 2005
(
S. Hosoishi
);
4 workers
,
7miles
,
Cameron
Highland,
12. iii. 2005
(
S. Hosoishi
);
3 workers
, Poring, Kinabalu (HQ,
550m
), Sabah,
17. iii. 1995
(
Sk. Yamane
);
2 workers
, Kota Kinabalu, Sabah,
22. vii. 1996
(
K
.
Eguchi
).
SINGAPORE
:
3 workers
,
4. xii. 1995
(
Sk. Yamane
);
2 workers
,
23. vii. 1996
(
Sk
.
Yamane
);
BRUNEI
:
2 workers
, Mixed Dipt. For.,
Dryobalanops beccarii
, Site
7. 50m
alt., Fog 11, Andalau,
viii. 1991
(
N. Mawdsley
);
INDONESIA
:
3 workers
, Kutai (Kal. Tim.), Kalimantan,
17. viii. 1986
(
T. Yajima
);
2 workers
, Teluk Kabung nr Padang, Sumatra,
14. viii. 1985
(
Sk. Yamane
);
1 worker
, Sako nr Tapan, Sumatra,
4–5. ix. 1985
(
Sk. Yamane
);
1 worker
, Limau Manis nr Padang, Sumatra,
3. ix. 1985
(
Sk. Yamane
);
2 workers
, P. Rakata Kecil, Krakatau Is.,
31. vii. 1982
(
Sk. Yamane
);
2 workers
, P. Peucang nr Ujung Kulon,
5. viii. 1982
(
Sk. Yamane
);
1 worker
, P. Sertung, Krakatau Is.,
30. vii. 1982
(
Sk. Yamane
);
1 worker
, P. Sertung, Krakatau Is.,
6. vii. 1982
(
Sk. Yamane
);
3 workers
, Bogor, Java,
4–8. xi. 1985
(
Sk. Yamane
);
3 workers
,
1 male
,
Pulau
Rakata, Krakatau Is., Sunda Strait,
1. i. 2007
(RK07-SKY-04) (
Sk. Yamane
);
1 queen
,
Pulau
Rakata, Krakatau Is., Sunda Strait,
1. i. 2007
(RK07-SKY-15) (
Sk
.
Yamane
);
1 worker
,
1 queen
,
Pulau
Sertung, Krakatau Is., Sunda Strait,
30. xii. 2006
(RK06-SKY-35) (
Sk. Yamane
);
2 workers
,
Pulau
Sebesi, Lampung Prov., Sunda Strait,
12. viii. 2005
(
Syaukani
);
2 workers
, P. Anak Krakatau, Krakatau Is., Sunda Strait,
17. viii. 2005
(Rk05-SKY-113) (
Sk
.
Yamane
);
2 workers
, P. Anak Krakatau, Krakatau Is., Sunda Strait,
17. viii. 2005
(RK05-SKY-117) (
Sk. Yamane
);
3 workers
,
1 male
, Surisura,
Pulau
Siberut, Mentawai Is.,
20. ii. 2007
(SU07-SKY-041) (
Sk. Yamane
);
2 workers
, Carita, W. Java,
24. xii. 2006
(JV06-SKY-08) (
Sk. Yamane
);
2 workers
, Bogor, Java,
9. xi. 1985
(
Sk
.
Yamane
);
1 worker
, Campus of Gajah Mada Univ. (
100m
alt.), Yogyakarta, Java,
19. xii. 2002
(
F. Yamane
);
8 workers
, Campus of Gajah Mada Univ. (
100m
alt.), Yogyakarta, Java,
29. xii. 2002
(
F. Yamane
);
6 workers
, Dusun PK, Jelati Mendaya, Bali,
5–6. v. 1998
(
Sk. Yamane
);
20 workers
, Senaru, Lombok,
30. ix. 2000
(
H. Simbolon
);
7 workers
, Senaru, Lombok,
30. ix. 2000
(
J. Abe
);
4 workers
, Senaru, Lombok,
30. ix. 2000
(
K. Ogata
);
2 workers
, Kopi house nr Semaya, Lombok,
29. x. 1998
(
K. Eguchi
).