Haplosyllis cratericola Buzhinskaja, 1990

Lattig, Patricia & Martin, Daniel, 2009, A taxonomic revision of the genus Haplosyllis Langerhans, 1887 (Polychaeta: Syllidae: Syllinae), Zootaxa 2220, pp. 1-40 : 17-18

Haplosyllis cratericola Buzhinskaja, 1990

( Fig. 11 A–F)

Syllis (Haplosyllis) cratericola Buzhinskaja, 1990: 25 –27, fig. 4. Haplosyllis cratericola .— Licher, 1999: 280.

Type material. Russia. Kurile Archipelago, Yankichi Island, Kratemaia Bay. Holotype ZISP 1/47543. coll. Kamenef. Expedition Institute Biology of Sea, from muddy-gravels, 5 m, August 1985. (Observed by Dr. Gagaev, invertebrate curator of ZISP).

Description. Holotype broken in two pieces; anterior part broad, length 16 mm, width 3 mm, for 32 chaetigers; medium body fragment width 28 mm, for 28 chaetigers ( Fig. 11 A, C). Yellow-pale. Prostomium subpentagonal, wider than long, with two pairs of small eyes in trapezoidal arrangement. Antennae long and slender, median antenna on medium of prostomium, with 40 articles; lateral antennae on anterior margin of prostomium, about 27 articles. Palps long, broadly triangular, divergent all along their length. Cilia on palps and nuchal organs not seen. Pharynx extending about 10 segments, anteriorly with large sharp tooth and crown of 10 soft papillae; cilia on papillae not seen. Proventricle long, extending about 11 segments. Peristomium well defined, shorter than subsequent ones. Dorsal and ventral tentacular cirri very long (40 and 22 articles, respectively). Dorsal cirri slender, similar to antennae and tentacular cirri; anterior cirri long (about 50 articles), midbody cirri shorter (30–35 articles). Ventral cirri digitiform, not longer than parapodial lobes ( Fig. 11 B). Chaetae all bidentate ( Fig. 11 D–E); from midbody parapodia onwards: LMF shorter than SW; MJP straight and long; MF broad; denticles on US of MF absent; apical teeth equal in length. Up to 20 chaetae on anterior parapodia; up to 14 on midbody. Aciculae straight, broad, with rounded tips ( Fig. 11 F), 12–13 and 8–10 on anterior and posterior parapodia, respectively.

Host. Unknown.

Reproduction. Unknown.

Distribution. Russia, Kurile Archipelago.

Remarks. Licher (1999) incorrectly named Haplosyllis cratericola as described by Buzhinskaja in 1980, but it was originally described by Buzhinskaja in 1990. H. cratericola resembles Haplosyllis ohma n. comb. (see relevant section) with regard to dorsal cirri length, chaetal shape and biogeographical distribution but differs in that H. cratericola has almost double the number of chaetae per parapodia and the pharynx seems to lack the trepan. As the presence/absence of trepan has been shown to be a non-robust character in Haplosyllis and that our observations are based on the holotype only, we have decided to consider the species as valid. However, a more detailed study of the chaetal variability and pharynx morphology should be carried out. The present description is based on the original description as well as photographs and observations of the holotype by Dr. Sergey Gagaev (ZIR).

Figures

FIGURE 11. Haplosyllis cratericola. A—two fragments of holotype; B—parapodium; C—anterior end, ventral view; D—anterior chaeta; E—midbody chaetae; F—acicula. A and B are photographs by Dr. Sergey Gagaev (Zoological Institute of Russia), C edited from a photograph, D and E redrawn from Buzhinskaja (1990). No scales available.