Neanthes unifasciata (Willey, 1905)

Pamungkas, Joko & Glasby, Christopher J., 2015, Taxonomy of reproductive Nereididae (Annelida) in multispecies swarms at Ambon Island, Indonesia, ZooKeys 520, pp. 1-25 : 6-7

Neanthes unifasciata (Willey, 1905) Fig. 4A, B

Nereis unifasciata Willey, 1905: 271-272, pl. 4, figs 85-88.

Type locality.

Cheval Paar, Sri Lanka

Material examined.

4 males (RCLA.Ann.020), 6 females (RCLA. Ann. 021), Alang, Ambon Island, Indonesia, 3°46'18.2"S, 128°00'24.6"E, coll. J. Pamungkas, 19 March 2014 ; 10 males (RCLA.Ann.022), 11 females (RCLA. Ann. 023), Lilibooi, Ambon Island, Indonesia, 3°45'08.8"S, 128°01'24.6"E, coll. J. Pamungkas, 19 March 2014 ; 111 males (RCLA.Ann.024), 57 females (RCLA. Ann. 025), Suli, Ambon Island, Indonesia, 3°37'38.2"S, 128°18'25.0"E, coll. R. Alik, 18 March 2014 ; 2 females (RCLA. Ann. 026), Suli, Ambon Island, Indonesia, 3°37'38.2"S, 128°18'25.0"E, coll. R. Alik, 19 March 2014 ; 38 males (RCLA.Ann.027), 41 females (RCLA. Ann. 028), Mahia, Ambon Island, Indonesia, 3°44'42.6"S, 128°11'24.6"E, coll. A.S. Leatemia, 18 March 2014 ; 6 males (RCLA.Ann.029), 5 females (RCLA. Ann. 030), Mahia, Ambon Island, Indonesia, 3°44'42.6"S, 128°11'24.6"E, coll. A.S. Leatemia, 19 March 2014 ; 3 males (MZB. Pol. 00169), Mahia, Ambon Island, Indonesia, 3°44'42.6"S, 128°11'24.6"E, coll. A.S. Leatemia, 18 March 2014 ; 1 male (MZB. Pol. 00170), Suli, Ambon Island, Indonesia, 3°37'38.2"S, 128°18'25.0"E, coll. R. Alik, 19 March 2014 ; 4 males (NTM W23791 ) , 5 females (NTM W23792 ), Hutumuri , Ambon Island, Indonesia, 3°42.1'S, 128°17.5'E, coll. J. Pamungkas, 14 March 2009 ; 2 males (NTM W23796 ), Alang , Ambon Island, Indonesia, 3°46'18.2"S, 128°00'24.6"E, coll. J. Pamungkas, 14 March 2009 ; 1 ex. (specimens extracted from a jar of many hundred worms in the collection of Naturalis , Leiden) (NTM W23806 ), Ambon Island, Indonesia, coll. D.S. Hoedt , 1866.

Size range.

Male: length (15-25 mm), maximum width (1.5-2.5 mm). Female: length (18-28 mm), maximum width (2.0-3.0 mm).

Diagnosis.

Neanthes species having dark brown band on dorsal surface of chaetiger 2 and lighter bands on following pre-natatory chaetigers (Fig. 4A, B). Paragnaths conical, arranged as follows: Areas I: 1; II: 14-16; III: 22-25; IV: 25-30; V: 0; VI: 6-12, very small: VII-VIII: 4-6 in one line. Male and female epitokes both with natatory region extending to pygidium, but differ in number of pre-natatory chaetigers and number modified dorsal and ventral cirri. Male has pre-natatory region comprising 16 chaetigers; basally swollen dorsal cirri on chaetigers 1 to 7; basally swollen ventral cirri on chaetigers 1 to 5 or 6. Female has pre-natatory region comprising 19-20 chaetigers; basally swollen dorsal cirri on chaetigers 1 to 5; basally swollen ventral cirri on chaetigers 1 to 5. Males differ from females in having subdistally swollen and scalloped dorsal cirri (smooth in females) and modified rosette pygidium.

Remarks.

The specimens examined in this study agree well the description of Willey (1905), which however is not very detailed. This species of Neanthes may be distinguished from other wawo Neanthes by the brown band on the dorsal side of chaetiger 2.

Distribution.

Indo-west Pacific (widespread).