Taxon classification Animalia Arhynchobdellida Hirudinidae

Hirudinaria sp. Figs 2C, 3C, 4C, 5 G–I

Material examined.

Ban Donsala, Na Wa, Nakhon Phanom: CUMZ 3405 (1 specimen; Figs 2C, 4C, 5 G–I), 3431 (4 specimens). Ban Majang, Na Wa, Nakhon Phanom: CUMZ 3406 (1 specimen; Figs 3C, 6 E–F).

Description.

In preserved specimens body length 107-140 mm, width 11-16 mm. In live specimens, dorsal side dark green, brown and dark brown. Middle dorsal line not present. Two brown stripes present each side of mid-dorsal region. Body margin yellow or orange with one ordered series of short black lines. Ventral side brown or dark brown without marker. Jaw trignathous, approximately 167 teeth. Number of salivary papillae, both small and large sizes, is 25 glands (Fig. 5 G–I). Gonopores separated by five annuli. Male reproductive system located in middle of body between somites XI and XII. Ejaculatory ducts short, connect with atrium side in somite XI. Atrium moderate sized, penis sheath curved, opening on ventral side. Vas deferens relatively smooth, runs along almost entire body, 11 pairs of testis sacs. Nerve cord runs along body length on right atrium side. Ovisacs somewhat long, albumin gland well developed, common oviduct long, opening into female bursa. Vagina caecum long, elongated in shape, no vaginal stalk (Fig. 4C).