Pilargis, Salazar-Vallejo & Harris, 2006

Salazar-Vallejo, Sergio I. & Harris, Leslie H., 2006, Revision of Pilargis de Saint-Joseph, 1899 (Annelida, Polychaeta, Pilargidae), Journal of Natural History 40 (3 - 4), pp. 119-159 : 156-157

Pilargis sp. n. Sweden

Material examined

One median fragment ( ECOSUR) heavily contracted, Singlefjord, Sweden, coll. legit F. Pleijel, 18 February 1986, 70– 100 m.

It is about 6 mm long, 1.2 mm wide, 28 setigers. Verrucae about the same size over the dorsum, conical, mammiliform, or 8-shaped. Those present over dorsal cirri larger over dorsal side, not much smaller than those over cirrophore. Parapodia directed dorsally because of distortion. Dorsal cirri with acuminate cirrostyles, squat cirrophore, the cirrostyle 1.5 times longer than cirrophore. Setal lobe triangular. Ventral cirri digitate slightly longer than setal lobe. All neurosetae smooth capillaries.

Discussion

This fragment does not fit into P. papillata Rasmussen , which has been described from a fjord environment, and it might be an undescribed species. It differs by having many verrucae with an 8-shaped profile, that are abundant and large over cirrostyles, and by having all setae capillaries. More and better material is required to describe the species.

Key to species of Pilargis de Saint-Joseph, 1899

1. Dorsal verrucae distributed throughout body........... 2

– Dorsal verrucae restricted to anterior end and parapodia ........ 6

2(1) Median segments with verrucae arranged in three longitudinal bands................ P. mohri Gallardo, 1968 ( Vietnam)

– Median segments with dispersed verrucae, not arranged in bands..... 3

3(2) Dorsal cirrophore larger than cirrostyles............ 4

– Dorsal cirrophore much larger than cirrostyles; dorsal cirri much larger than ventral cirri.......... P. cholae n. sp. (Grand Caribbean region)

– Dorsal cirrophore about as long as the cirrostyles; dorsal cirri larger than ventral cirri. P. υerrucosa de Saint-Joseph, 1899 (Eastern France and Mediterranean Sea)

– Dorsal cirrophore indistinct; dorsal cirri larger than ventral cirri.................. P. pacifica Uschakov, 1955 ( Japan Sea)

4(3) First dorsal cirri smaller than following ones................... P. papillata Rasmussen, 1973 (Western Norway)

– First dorsal cirri larger than following ones............ 5

5(4) Verrucae small; notopodial glands internal............ P. modesta Intes and le Loeuff, 1975 (Northwestern Africa and Western Mediterranean Sea)

– Verrucae large; notopodial glands restricted to its anterior surface.................. P. rozbaczyloi n. sp. (Central Chile)

6(1) Verrucae medium sized; dorsal cirrophore smaller than cirrostyles............... P. aeolfi n. sp. (Northern Gulf of Mexico)

– Verrucae small.................... 7

7(6) First dorsal cirri as long as following ones; dorsal cirrophore smaller than cirrostyles; notopodial glands not seen...................... P. angeli n. sp. (Northeastern Pacific Ocean)

– First dorsal cirri longer than following ones............ 8

8(7) Dorsal cirrophore larger than cirrostyles............ 9

– Dorsal cirrophore as long as cirrostyles............ 10

9(8) Median setigers with cirrophore smooth, with many large internal glands.............. P. berkeleyae Monro, 1933 (California)

– Median setigers with cirrophore verrucose, with small internal glands.......... P. modesta Intes and le Loeuff, 1975 (Northwestern Africa)

10(8) Dorsal cirrostyles fusiform; median setigers with ventral cirri longer than setal lobe; notopodia with dispersed pigmented glands............. Pilargis tardigrada ( Webster, 1879) (Northwestern Atlantic Ocean)

– Dorsal cirrostyles digitiform; median setigers with ventral cirri shorter than setal lobe; notopodia with glands over its anterior face.................... P. maculata Hartman, 1947 (California)