Mystrium camillae (Bihn, J. H. & Verhaagh, M. 2007)
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Ordo: Hymenoptera
Familia: Formicidae
Genus: Mystrium
Name
Mystrium camillae Bihn, J. H., 2007 – Wikispecies link – Pensoft Profile
- Mystrium camillae Bihn, J. H., 2007, Zootaxa 1642: 2-3.
Description
Fig. 1-3, 10, 13
Materials Examined
Myanmar "Birmania ": Bhamd Fea Indonesia limestone mountain near Tjampea Karawaiew China Menglun Town, Bakaxiaozhai Xu Zheng-hui China Menglun Town, Bakaxiaozhai; 840 m, seasonal rainforest Xu Zheng-hui
Materials Examined
Indonesia Lampung, Tulang Bawang, Gn. Tanggang; 580 m A. Riedel Indonesia Lampung, Tulang Bawang, Gn. Tanggang; 580 m A. Riedel Indonesia Ciamis, Gn. Sawal, Batu Cakra; 990 m A. Riedel Malaysia (West) Simpang Pertang, Pasoh Forest Reserve K. Rosciszewski Malaysia (West) Lake Kenyir; 300-400 m A. Schulz
Description
Measurements and indices. Workers: HL 0.81-1.75, HW 0.85-1.64, CI 88-105, SL 0.50-1.00, SI 54- 64, ML 0.52-1.75, WL 0.91-1.49, PW 0.47-0.80 (n = 31).
Diagnosis
Diagnosis (worker). The following character combination differentiates M. camillaeHNS from all its congeners in the Indo-Australian region: the apex of each mandible distinctly expanded and rounded in lateral view, with a more or less triangular and caudally directed tip on the inner side; outer face of labrum entirely covered with a weakly developed, irregular rugoreticulum; maxillary palps 4-segmented; the second segment of the maxillary palp shorter than the basal (first) segment and less than half as broad as the basal segment; antennal segment III shorter than twice its width; each anterolateral corner of the head produced into a short, nearly triangular, pointed spine; dorsum of head with rugose-reticulate cuticular sculpture and spatulate hairs; minute compound eyes; petiolar node not broader than twice its length measured in dorsal view.
Distribution
Distribution. Widely distributed in the Indo-Australian region and neighboring countries. Recorded from Australia, Brunei, China, India, Indonesia, Malaysia, Myanmar, Papua New Guinea, the Philippines and Singapore.
Discussion
Comments. Brown (1960, p. 170) gave no justification for the synonymy of M. camillae subsp. javanaHNS under M. camillaeHNS but the differences between the taxa given in the description of Karawaiew (1925) fall within the variation of the senior synonym. The most important difference between the taxa - the shape of the mandible apex - depends on the angle from which the mandible is viewed. The triangular tip is highly variable in the specimens examined and often worn out. The number of truncated teeth at the anterior clypeal margin varies from 6-7 in the specimens we have seen and thus is not a character to distinguish the taxa. In most cases there is a toothless gap between the left and right group of these teeth (but see the specimens from Northern Australia depicted on AntWeb [Australia Howard Springs, Darwin district W. L. Brown , Australia Baroalba Spring; rainforest ]. From Karawaiew's description it is clear that he never had a specimen of M. camillaeHNS at hand but made his judgment of the species just from the description and the drawings of Emery (1889). Xu (1998: 161, figs. 1 & 2) notes in his description of M. oculatumHNS that this species is close to M. camillaeHNS but differs from it by: "small eyes present; central dorsum of hat flat; metanotal groove only shallowly depressed; declivity of propodeum flat, not depressed; anterodorsal angle of petiolar node more extruding." All examined specimens of M. camillaeHNS possess minute compound eyes. The presence of eyes was already noted in the original description of M. camillaeHNS by Emery (1889) and again in Menozzi's revision. Therefore, the presence of eyes in M. oculatumHNS cannot be regarded as a diagnostic character to distinguish it from M. camillaeHNS. All other diagnostic characters given for M. oculatumHNS by Xu vary much among individuals of M. camillaeHNS. The morphology of M. oculatumHNS as described by Xu (1998: 161-162, figs. 1 & 2) and shown by photographs of a paratype of M. oculatumHNS on AntWeb (www.antweb.org: CASENT0104982) falls well within the range of morphological variation exhibited by the examined specimens of M. camillaeHNS. Additionally, all but one metric character of M. oculatumHNS fall into the range of M. camillaeHNS. The exception is CI, which is slightly higher.
Taxon Treatment
- Bihn, J. H.; Verhaagh, M.; 2007: A review of the genus Mystrium (Hymenoptera: Formicidae) in the Indo-Australian region., Zootaxa 1642: 2-3. doi
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