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species
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Crematogaster nawai
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Japanese Name
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Tsuya-shiriage-ari
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Original Reference
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Ito, T. (1914) Formicidarum Japonicum species novae vel minus cognitae. Annales de la SociŽtŽ Entomologique de Belgique 58: 40-45.
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Synonym
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Crematogaster auberti var. nawai Ito 1914,
Crematogaster (Acrocoelia) nawai: Emery, 1922e,
Crematogaster laboriosa nawai: Santschi, 1930d,
Crematogaster laboriosa Smith, F. 1874,
Crematogaster nawai: Onoyama, 1998,
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Description
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Total length of workers around 4 - 5.5 mm. Body color brown to blackish brown, dorsum of head and posterior half of gastral tergites sometimes slightly darker. Antennal club 3-segmented. Promesonotal suture indistinct. Thoracic dorsum in lateral view raised at anterior border of mesonotum. The whole of the pronotum and the mesonotal dorsum smooth. Mesonotal dorsum convex and not margined laterally and with a faint, longitudinal median carina. Posterior half of mesonotal pleuron punctured. Metanotal groove distinctly impressed, not clposed by a lamella at the lateral border of its dorsum. Propodeal spines rather long, slenderly triangular in lateral view. Subpetiolar process small, denticulate and produced anteriorly. Petiole a little longer than wide, the sides in dorsal view narrowed posteriorly. Postpetiolar dorsum with a median furrow.
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Remarks
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C. nawai is distinguishable from other Japanese species because its thoracic dorsum is convex and not margined laterally and its petiole is longer than wide. Note that identifications of specimens as C. nawai in literature preceding Onoyama (1976) are likely to be erroneous (Onoyama, 1980). This species is abundant near sea shores and nests under stones or (rarely) inside the wood of dead trees. Onoyama (1998) synonomized C. nawai Ito, 1914 with C. laboriosa F. Smith, 1874. The latter is preoccupied by C. laboriosa F. Smith (1860), so that C. nawai is the oldest available name for this taxon.
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Distribution
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Honshu (the Kansai region and southwards), Shikoku, Tsushima I., Kyushu, Yaku I., Tanegashima I., Amami Is, Okinawa I.; Korean Peninsula, Taiwan(?).
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References
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- Formicidarum Japonicum species novae vel minus cognitae. Annales de la SociŽtŽ Entomologique de Belgique 58: 40-45.
- Emery, C. (1922). Hymenoptera, fam. Formicidae, subfam. Myrmicinae. . In P. Wytsman, ed., ""Genera Insectorum"", fasc. , 174B-C, 95-397, .
- Santschi, F. (1930). Trois notes myrmecologiques. . Bull. Ann. Soc. Ent. Belg., 70, 263-270.
- Descriptions of new species of Tenthredinidae, Ichneumonidae, Chrysididae, Formicidae, &c. of Japan. Transactions of the Entomological Society of London (4) 7: 373-409.
- Smith, F. 1860. Catalogue of hymenopterous insects collected by Mr. A. R. Wallace in the islands of Bachian, Kaisaa, Amboyna, Gilolo, and at Dory in New Guinea. J. Proc. Linn. Soc. Lond. Zool., 5(17b)(suppl. to vol. 4): 93-143.
- Onoyama, K. (1998). Taxonomic notes on the ant genus Crematogaster in Japan (Hymenoptera: Formicidae). 1: 227-232.
- Onoyama, K. (1976). A preliminary study of the ant fauna of Okinawa-Ken, with taxonomic notes. (Japan: Hymenoptera: Formicidae). . Ecol. Stud. Nat. Cons. Ryukyu Isl., 2, 121-141.
- Onoyama, K. (1980). An introduction to the ant fauna of Japan, with a check list (Hymenoptera, Formicidae). . Kontyu, 48, 193-212.
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Editor
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Original text by Keiichi Onoyama and Masaaki Morisita. English translation by Keiichi Onoyama, edited by Robert W. Taylor. Revised by Masashi Yoshimura.
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