Polypheretima grandisetosa ( Thai , 1996 )

Nguyen, Tung T., Tran, Binh T. T. & Nguyen, Anh D., 2014, Earthworms of the ' acaecate' Pheretima group in Vietnam (Oligochaeta: Megascolecidae), with description of a new species from the Mekong delta, Zootaxa 3866 (1), pp. 105-121 : 115

Polypheretima grandisetosa ( Thai, 1996)

( Fig. 3 )

Pheretima grandisetosa Thai, 1996: 3 , Fig. 2 B.

Polypheretima grandisetosa — Nakamura 1999: 7; Blakemore 2007: 45.

Type material. Holotype: 1A (SORC-HV.223) Ba Ria-Vung Tau province, Conlon Island, slope near Datdoc Bay, 10m asl, 25 June 1989, coll. Thai Tran Bai. Paratype: 1A, same data as holotype ( Thai 1996).

Further material. 5A ( SORC), Ba Ria-Vung Tau province, Baycanh Island, 210m asl, 20 June 1989, coll. Thai Tran Bai ( Thai 1996).

Description. Body cylindrical, small size, unpigmented. Prostomium prolobous. First dorsal pore in 11/12. Setae all fine and regularly distributed on pre- and postclitellar segments, 60(16) in V, 54 in VI, 50 in VIII, 40+ 4 in XVIII, 44 in XXV, aa=1.52ab, zz=zy; segment VI with 4–6 enlarged setae on the dorsal side. Male pores on transversely oval porophores. No genital markings in both spermathecal and male regions. Spermathecal pores 2 pairs, ventral in furrows 5/6/7, about 0.25 body circumference apart. Metandric. Seminal vesicles in XII. Ovaries small in XIII. Last hearts in XIII. Intestine beginning at XVII, without caeca. Typhlosole simple, lamelliform, T=0.15. Septa 8/9/10 absent, 5/6/7/8 thickened. Pharyngeal micronephridia in 7/8. (Data from Thai 1996: 3–4.)

Records from Vietnam. Ba Ria-Vung Tau Province (Conlon Island; Baycanh Island).

Distribution. Only known from Vietnam.

Remarks. The species is relatively close to Polypheretima colonensis Thai, 1996 , but differs in smaller size and the presence of big setae in VI. Types were rechecked for this study.

Figures

FIGURE 2. Distribution of species of the genus Planapheretima in Vietnam.

FIGURE 3. Distribution of species of the genus Polypheretima in Vietnam. The exotic Po. elongata with many records all over the country is omitted.