Weeyawat Jaitrong

The army ant Aenictus silvestrii and its related species in Southeast Asia, with a description of a new species (Hymenoptera: Formicidae: Aenictinae)

Three species of Aenictus with reduced numbers of antennal segments (8–9) occur in Southeast Asia: A. jarujini sp. nov., A. latifemoratus and A. silvestrii. Aenictus latifemoratus is new to Java and Borneo, while A. silvestrii is recorded for the first time from Borneo.

Review of the Southeast Asian species of the Aenictus javanus and Aenictus philippinensis species groups (Hymenoptera, Formicidae, Aenictinae)

Abstract The Southeast Asian species of the Aenictus javanus and Aenictus philippinensis groups are revised. Six species (four named and two new species) of the Aenictus javanus group occurring in this area are: Aenictus doydeei Jaitrong & Yamane, 2011, Aenictus duengkaei Jaitrong & Yamane, sp. n., Aenictus javanus Emery, 1896, Aenictus longinodus Jaitrong & Yamane, sp. n., Aenictus nishimurai Terayama & Kubota, 1993, and Aenictus piercei Wheeler & Chapman, 1930. Four species (three named and one new species) are recognized in the Aenictus philippinensis group: Aenictus pangantihoni Zettel & Sorger, 2010, Aenictus philippinensis Chapman, 1963, Aenictus punctatus Jaitrong & Yamane, sp. n., and Aenictus rabori Chapman, 1963. Aenictus piercei is removed from the members of the Aenictus piercei group sensu Jaitrong and Yamane (2011) and transferred to the Aenictus javanus group. Lectotypes and paralectotypes are designated for Aenictus piercei and Aenictus rabori. Size variation occurs among individuals from single colonies of the Aenictus javanus group, while the workers in the Aenictus philippinensis group are clearly monomorphic.

First record of the family Schizodactylidae (Orthoptera: Ensifera) from Thailand, with the description of a new species

A new species of dune cricket in the family Schizodactylidae, Schizodactylus salweenensis sp. nov. is described from Salween River, Mae Hong Son Province, northwestern Thailand based on both males and females. The Schizodactylidae is recorded for the first time in Thailand. The new species is most similar to Schizodactylus tuberculatus Ander, 1938 and Schizodactylus burmanus Uvarov, 1935 in the morphology of male subgenital plate, but mainly differs in the shape of subgenital plate apex, and the spurs of hind tibiae. The type series was collected from sand dunes along the river. This cricket reaches adulthood during the rainy season.

Two new species of the Aenictus wroughtonii species group (Hymenoptera, Formicidae, Dorylinae) from Thailand

Abstract The Aenictus wroughtonii species group is widely distributed in Asia. The members of this group are characterised by a slender body, long legs, anterior clypeal margin with 5–10 denticles and a weakly-developed subpetiolar process. Twelve worker-based species of this group have been recorded from Asia. Herein, two new species from Thailand (Aenictus nuchiti sp. n. and Aenictus samungi sp. n.) are added to this group. A key to the Asian species of this group is provided.

A sibling species of Platythyrea clypeata Forel, 1911 in southeast Asia (Hymenoptera, Formicidae, Ponerinae)

Abstract A new species of the rarely collected ant genus Platythyrea Roger, 1863 closely related to Platythyrea clypeata Forel, 1911 is described and illustrated based on the worker caste under the name Platythyrea janyai sp. n. This species is distributed in southern Thailand and western Malaysia, while P. clypeata is distributed in Sri Lanka, Vietnam, Laos, and Thailand in the areas north of the Isthmus of Kra. Platythyrea clypeata is newly recorded from Thailand from dead wood on the forest floor. The type series of P. janyai was also collected from rotten wood on the forest floor.