Polycirrus chilensis Schmarda, 1861

Glasby, Christopher J. & Hutchings, Pat, 2014, Revision of the taxonomy of Polycirrus Grube, 1850 (Annelida: Terebellida: Polycirridae), Zootaxa 3877 (1), pp. 1-117 : 36

Polycirrus chilensis Schmarda, 1861

Fig. 15a–e

Polycirrus chilensis Schmarda, 1861: 39 .

Apneumea chilensis .— Quatrefages, 1865: 383.

Dejoces chilensis Kinberg, 1867: 348 .

Type locality. Valparaiso, Chile .

Material examined. HOLOTYPE: SMNH 571 . Chile, Valparaiso, Ilongrotes, 33˚00.41′ S, 71˚36.37′ W, Eugene Expedition St. 488.

Description. Holotype poorly preserved but body wall and chaetae mainly intact, in two probably contiguous fragments, pale cream in colour; anterior fragment 10 mm long and 1.5 mm wide excluding buccal tentacles, consisting of approximately 25 segments; posterior fragment 5 mm long and 1 mm wide consisting of approximately 40 segments. Sex unknown.

Dorsum anteriorly papillose. Venter anteriorly with mid-ventral groove and discrete ventro-lateral pads; pads more-or-less smooth, extending from segment 2 to 11. Mid-ventral groove from segment 3 ( Fig. 15a ).

Buccal tentacles of two types although few remain attached: (1) cylindrical, thickened distally, distinctly grooved and (2) cylindrical, uniformly thin, weakly grooved, both types arising at junction between prostomium and upper lip. Prostomial ridge distinctly curved, extending laterally along anterodorsal base of upper lip. Upper lip trefoiled, small wing-like lobes laterally (medial lobe subtriangular), margin of medial lobe convoluted; oral surface glandular, ciliated, with grooves leading to mouth. Inner lower lip oblong, tessellated; outer region flat, shield-like, subtriangular and pointing toward mouth, ridged and grooved, extending posteriorly to segment 3. Achaetous segments visible dorsally but obscured by expanded outer lower lip ventrally ( Fig. 15a ).

Notochaetigerous segments 35–37 (assuming two fragments are contiguous). Notopodia digitiform, prechaetal lobe low, postchaetal lobe digitiform, longer than prechaetal ( Fig. 15b ). Notochaetae within a chaetiger consisting of two types (chaetigers 4, 23 examined), hirsute, uniformly tapered, posteriorly same form as those anteriorly; secondary notochaetae in all chaetigers pinnate ( Fig. 15c ). Neurochaetae beginning on segment 8. Neuropodial tori ridge like. Uncini with short neck and straight to convex base (Type 1), teeth above main fang arranged in double transverse series (MF:1:∞) enlarged median tooth above main fang present, subrostral process present as low protuberance ( Fig. 15d–e ).

Nephridial papillae present, globular. Pre-gular membrane nephridial papillae absent. Post-gular membrane nephridial papillae present, extending from segment 5 to 9; situated at base of notopodia. Pygidium smooth ring.

Figures

FIGURE 15. Polycirrus chilensis Schmarda. Holotype SMNH 571. a. Anterior ventral view. b. Right side anterior view of notopodium, chaetiger 4. c. Notochaetae from chaetiger 4, illustrated at x40 and x100. d. Lateral and frontal views of uncini from segment 24. e. Lateral view of uncinus from posterior chaetiger.