Proceraea boreata ( Imajima, 1966 )

Nygren, Arne, 2004, Revision of Autolytinae (Syllidae: Polychaeta)., Zootaxa 680, pp. 1-314: 46-47

publication ID


publication LSID

persistent identifier

treatment provided by


scientific name

Proceraea boreata ( Imajima, 1966 )

comb. n.

Proceraea boreata ( Imajima, 1966)  comb. n. (Fig. 8 A –D)

Autolytus (Regulatus) boreatus Imajima, 1966: 75  –77, fig. 24 A –H.

Material examined. Japan: 1 paratype NSMT­Pol P­ 3, Cape Shiriyazaki, 140 m. Diagnosis. Proceraea  with 2 longitudinal lines; trepan with 18 large and 9 smaller teeth, arranged in 2 rings.

Description. Length 14 mm for 64 chaetigers, complete, width 0.4 mm. Preserved material yellowish with 2 longitudinal brownish lines (Fig. 8 A, B); eyes brownish red. Ciliation not possible to assess.

Eyes large, almost confluent (Fig. 8 A); eye spots absent. Palps in dorsal view projecting c. 1 / 3 of prostomial length, fused. Extension of nuchal epaulettes to end of tentacular segment (Fig. 8 A).

Antennae and anterior appendages lost or broken. Alternation in direction of cirri not assessed. Dorsal cirri from chaetiger 3, of equal length, 1 / 4 of body width. Cirrophores on tentacular segment and first dorsal cirri present; cirrophores otherwise absent. All appendages cylindrical, including lost anterior appendages ( Imajima 1966).

Parapodial lobes rounded conical, small. Anterior chaetigers with 2 aciculae, 1 in median and posterior. Chaetal fascicle with 10–12 compounds in anterior chaetigers, 6–10 in median and posterior. Compound chaetae with small distal tooth (Fig. 8 C); serration present. Single thick bayonet chaetae, beginning at chaetiger 30.

Pharynx with sinuation anterior to proventricle. Trepan with 27 unequal teeth; 18 large and 9 smaller; 2 large alternating with 1 small, arranged in 2 rings. Basal ring present; infradental spines absent. Proventricle equal in length to 2 segments in chaetiger 6–7 with c. 37 rows of muscle cells (Fig. 8 D). Anal cirri equal in length to dorsal cirri.

Reproduction. Anterior scissiparity (Fig. 8 B).

Habitat. Unknown.

Distribution. North East Pacific. Northern Japan.

Remarks. Proceraea boreata  is very similar to P. okadai Imajima, 1966  ; in external features they are inseparable, and differ only in the number of teeth in the trepan.














Proceraea boreata ( Imajima, 1966 )

Nygren, Arne 2004


Autolytus (Regulatus) boreatus

Imajima 1966: 75