Synelmis amoureuxi, Salazar-Vallejo, 2003

Salazar-Vallejo, Sergio I., 2003, Revision of Synelmis Chamberlin, 1919 (Annelida, Polychaeta, Pilargidae), Zoosystema 25 (1), pp. 17-42 : 22-23

publication ID 10.5281/zenodo.5392022

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scientific name

Synelmis amoureuxi

sp. nov.

Synelmis amoureuxi View in CoL n. sp.

( Fig. 2 View FIG )

Ancistrosyllis rigida View in CoL – Augener 1927: 50, 51. — Fauvel 1953b: 7 (non Fauvel 1919a).

Synelmis sp. A – Wolf 1984: 29.35-29.37, figs 29.35, 29.36.

Synelmis albini View in CoL – Pettibone 1966: 191-195, figs 19-21 (partim). — Nonato & Luna 1970: 68, figs 10, 11 (material not seen). — Rullier & Amoureux 1979: 160 (partim).

Synelmis simplex View in CoL – Treadwell 1924: 12, 13 (non Chamberlin 1919, partim).

TYPE MATERIAL. — Holotype: Brazil, Calypso , stn 1, off S. Joao Pessoa, 7°29’S, 34°30’W, 45 m, complete specimen ( MNHN A885 View Materials , As 197). Paratypes: Caribbean Sea, Univ. Iowa Barbados-Antigua Expedition, Fort Barclay , English Harbor, Antigua, summer 1918, id. A. L. Treadwell, M. H. Pettibone, 1 paratype ( USNM 20306 View Materials ) GoogleMaps ; Caracasbaai , Curaçao, 1.V.1920, C. J. van der Horst, 1 paratype ( ZMA V. Pol. 38) ; West Indies , stn 227-10, 1942, W. Hartman coll., 1 paratype, complete specimen, 15 mm long, 0.2 mm wide with 83 setigers, notospines start in setiger 5 ( USNM 49241 View Materials ) .

ETYMOLOGY. — Named for Dr Louis Amoureux, a polychaete researcher from the Université catholique de l’Ouest, Angers, for his many publications on polychaetes and especially his studies on materials collected by the Calypso expeditions, including some of these specimens.

TYPE LOCALITY. — Off S. Joao Pessoa, Brazil.

OTHER MATERIAL EXAMINED. — Caribbean Sea. N off Martinique Island, Président Théodore Tissier, stn 187, 15°15’N, 60°57’W, 90 m, posterior fragment ( MNHN AW 646 View Materials , A900 View Materials , T 99-41 View Materials ) GoogleMaps ; Fauvel slide collection, 1 slide (IEA-A81’). (There are four parapodia; body wall was desintegrated and the resin has fractured. One of the parapodia has an additional acicula and in two others finely limbate neurosetae can be seen but furcate setae could not be found). — Off Vieques Island, Puerto Rico, stn 6, 28.IV. 1978, 347 m, 1 damaged specimen ( USNM 56349 View Materials ) .

Brazil. Calypso , off Fernando de Noronha Island , stn 17, 3°48.6’S, 32°24.8’W, 52 m, 1 specimen in three portions ( MNHN A885 View Materials , As 199) GoogleMaps ; 1 anterior fragment ( MNHN A879 View Materials , Ak 489). — S of Recife , stn 27, 8°25’S, 34°48’W, 33 m, posterior fragment ( MNHN A879 View Materials Ak 489) GoogleMaps .

DISTRIBUTION. — Martinique, Curaçao, Lesser Antilles, to Recife, Brazil, including Fernando de Noronha Island, in 33-90 m depth.


Holotype with body dark ( MNHN A885, As 197), filiform, 23-32 mm in length, 0.6-0.9 mm in width, 78-106 setigers (and one or two posterior asetigers). Integument smooth but adsorbed salt gives rugose or even spinulose appearance, especially in cirral tips.

Prostomium rectangular, with biarticulated palps separated from each other and both separated from the prostomium, palpostyles massive knobs with smooth tegument and single ventrolateral papillae arising from base of each ( Fig. 2A View FIG ). Three cirriform antennae, lateral antennae emerge at base of palps and reach palpostyle tips; median antenna is slightly longer, emerging from posterior prostomial margin. Two lensed eyes placed slightly laterally. Two pairs of tentacular cirri, cirriform, slightly longer than cirri of setiger 1. Parapodia with cirriform cirri, with basal swelling in all setigers; setal lobe wider and about one third length of the cirri. Notopodia reduced to dorsal cirrus; from setiger 5 straight notospine emerges, becomes posteriorly longer and thicker. Notospines project farther in posterior setigers but most are broken ( Fig. 2 View FIG B-D). Prepygidal region with one or two asetigerous segments, parapodial cirri long, cirriform. Pygidium simple, anus terminal, and two anal cirri as long as the last two segments ( Fig. 2E View FIG ).

Notosetae restricted to notospines, completely smooth and slightly curved distally. Neurosetae of three kinds, limbate capillaries most abundant, smaller ventrally than dorsally, few long smooth capillaries, and one or two slightly asymmetrical furcate setae. Details difficult to determine because of the adsorbed salt.

Pharynx as long as two setigers when complelety everted, non-everted pharynx reaches setiger 10, unpigmented. Posterior gut unpigmented, rings of muscle cells not visible. Brain bilobed, short, reaches slightly past setiger 1.

Other paratype (USNM 20306) is an anterior fragment with two deep cuts over its anterior end to remove several parapodia at the same time. It is 25 mm long, 1.0 mm wide, with 51 setigers. The prostomium has one pair of eyes but the right one is split into two. Notospines start from setiger 5; pharynx is partly everted, about 12 setigers long.


Synelmis amoureuxi n. sp. resembles S. gibbsi n. sp. and S. knoxi Glasby, 2003 , in having cirriform antennae and cirri, and notospines starting from setiger 5, but they differ in the relative length of median antennae and first dorsal cirri being longer in S. gibbsi n. sp. and S. knoxi ; also, in both species, the median setigers have basally swollen cirri.


Museum National d'Histoire Naturelle


Universiteit van Amsterdam, Zoologisch Museum














Synelmis amoureuxi

Salazar-Vallejo, Sergio I. 2003

Synelmis albini

RULLIER F. & AMOUREUX L. 1979: 160
NONATO E. F. & LUNA J. A. C. 1970: 68
PETTIBONE M. H. 1966: 191

Ancistrosyllis rigida

FAUVEL P. 1953: 7
AUGENER H. 1927: 50

Synelmis simplex

TREADWELL A. L. 1924: 12
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