Description of the larva of Hämäläinen, 2003 (Odonata, Platycnemididae), with a key to the larvae of the subfamily Platycnemidinae from the Sino-Japanese and Oriental regions.

The final instar larva of the rare species Hämäläinen, 2003 is described and illustrated here for the first time, including a new distribution record from Vietnam. The larva of differs from that of congeneric species by distinct morphological features, including the presence of four setae on the palpal lobe of the labium, the presence of lateral spines on abdominal S5-9, and a long terminal filament on the caudal lamella. We also provide a key to species for the known larvae of the subfamily Platycnemidinae in the Sino-Japanese and Oriental regions.

The megascolecid earthworms (Annelida, Oligochaeta, Megascolecidae) in the Phu Quoc island, Vietnam, with descriptions of three new species.

The megascolecid earthworms of the Phu Quoc island are intensively investigated. Twelve species in three genera ( Kinberg, 1867, Kinberg, 1867, and Sims & Easton, 1972) are recorded. Of these, Bantaowong & Panha, 2016 is recorded for the first time in Vietnam, and three species are newly described, namely , , and An identification key to 12 megascolecid species is provided as well.

Notes on the genus Laidlaw, 1917 in Vietnam with description of sp. n. (Odonata, Zygoptera, Platycnemididae).

(holotype ♂, 12°07'10.0"N, 108°5'51.0"E, 1503 m a.

Three new "caecate" earthworm species from Sulawesi, Indonesia (Oligochaeta, Megascolecidae).

Three new earthworm species are described from Sulawesi, Indonesia. Two belong to the genus Sims & Easton, 1972, namely Fahri, Amaliah & Atmowidi, and Fahri, Amaliah & Atmowidi, The new species, is distinguished by a medium size (135-165 mm long, 4.5-6.