Gastrostomobdella, MOORE, 1929

GENUS GASTROSTOMOBDELLA MOORE, 1929

Type species: Gastrostomobdella monticola Moore, 1929 , fixed by original designation.

Emended diagnosis: Female gonopore in somite XII/ XIII to anterior part of somite XIII. Pharyngopore and pharyngoporal duct absent. Gastropore, when present, ventral in posterior part of somite XIV to somite XIV/ XV. Gastroporal duct columnar, running vertically from ventral surface of crop to gastropore; two pores open to crop; canal Y-shaped; penetrated by nerve cord. Pair of atrial cornua undeveloped or weakly developed. Tubular ovisacs generally running alongside ventral nerve cord.

Remarks: The genus Gastrostomobdella originally comprised only the gastroporous species ( Richardson, 1971; Sawyer, 1986). According to the emended diagnosis, however, the genus can contain the Southeast Asian euthylaematous erpobdelliform species without a gastropore and gastroporal duct. Gastrostomobdella species are distinguished from Scaptobdella species by the following combination of morphological characteristics: female gonopore in somite XII/XIII to anterior part of somite XIII (in the posterior part of somite XII in Scaptobdella ); atrial cornua rudimentary or weakly developed (developed conical, and curved posterolaterally), and tubular ovisacs generally running alongside the ventral nerve cord (running dorsally on respective sperm ducts).

GASTROSTOMOBDELLA EXTENTA NAKANO AND