Paxtonia amoureuxi Budaeva & Fauchald, 2011

Budaeva, Nataliya & Fauchald, Kristian, 2011, Phylogeny of the Diopatra generic complex with a revision of Paradiopatra Ehlres, 1887 (Polychaeta: Onuphidae), Zoological Journal of the Linnean Society 163 (2), pp. 319-436 : 411-414

publication ID 10.1111/j.1096-3642.2011.00701.x

persistent identifier

treatment provided by


scientific name

Paxtonia amoureuxi


PAXTONIA AMOUREUXI ( INTES & LE LOEUFF, 1975) COMB. NOV. ( FIGS 83–85 View Figure 83 View Figure 84 )

Onuphis amoureuxi Intes & Le Loeuff, 1975: 313–314 ,

fig. 10h–q. Fauchald, 1982: 96–97, fig. 15d–e. Paradiopatra amoureuxi Paxton, 1986a: 38 .

Type material: MNHN POLY TYPE 1245 , ORSTOM Expedition , off Côte d’Ivoire, 5.1°N, 4.333°W, 80 m, 25 November 1966, dredge, coll. Intes, A. and Le Loeuff, P. (holotype) GoogleMaps ; MNHN POLY TYPE 1343 , ORSTOM Expedition , off Côte d’Ivoire, 5.033°N, 4.15°W, 170 m, 24 November 1966, dredge, coll. Intes, A. and Le Loeuff, P. (one paratype) GoogleMaps ; MNHN POLY TYPE 1354 , the same locality as another paratype (one paratype) GoogleMaps .

Non-type material examined: ZMUB, Fridtjof Nansen , Gulf of Guinea, off Nigeria, St. N 04A (one); St. N04D (one); St. N10B (one).

Type locality: Atlantic Ocean , West Africa, off Côte d’Ivoire, 5.1°N, 4.333°W, 80 m. GoogleMaps

Diagnosis: First eight pairs of parapodia modified and directing slightly anteriorly; first five chaetigers with indistinctly bidentate pseudocompound falcigers, and pseudocompound tapering chaetae with moderately long pointed hoods; parapodial pockets present on chaetigers 6–25; branchiae pectinate, with up to five filaments, starting from chaetiger 10 and continuing to the end of the body. Prechaetal lobes triangular to conical, distinct on all parapodia.

Description: All specimens incomplete; holotype with 54 chaetigers, 2.6 mm wide; two paratypes 4.3 and 4.7 mm wide for 54 and 77 chaetigers, respectively. The most complete non-type specimen consisting of several fragments, with about 230 chaetigers. Largest non-type specimen 4.2 mm wide. A fragment consisting of about 15 posteriormost chaetigers with pygidium was found among non-type specimens. Body dorsoventrally flattened, including anterior chaetigers, and lacking a distinct pigmentation pattern ( Fig. 83A View Figure 83 ).

Prostomium short and wide, with rounded anterior edge and one pair of ovoid frontal lips ( Fig. 83B, C View Figure 83 ). Palps reaching chaetiger 2 (chaetiger 1); lateral antennae reaching chaetiger 22 (chaetigers 12–22). Median antenna remaining only in two specimens, reaching chaetiger 20 (chaetiger 16), which is longer than the lateral antennae ( Fig. 83A–C View Figure 83 ).

Ceratophores of lateral antennae with six or seven (between five and eight) rings without lateral projections. Palpophores and cerartophores of median antenna also without projections, with one ring less than the ceratophores of the lateral antennae. Nuchal grooves almost straight, with wide mid-dorsal separation. Relatively large eyes present near bases of lateral antennae ( Fig. 83A View Figure 83 ). Peristomium about onethird as long as first chaetiger. Peristomial cirri present, slightly longer than peristomium ( Fig. 83A, B View Figure 83 ).

First seven (eight) pairs of parapodia modified, projecting laterally, directing slightly anteriorly, but not enlarged. Prechaetal lobes rounded ( Fig. 83G View Figure 83 ). Postchaetal lobes large and triangular through anterior 10 to 13 chaetigers ( Fig. 83G View Figure 83 ), later becoming smaller towards posterior region, but still distinct on the posteriormost parapodia. Parapodia of chaetigers 7–14 (chaetigers 6–23) with large parapodial pockets limited frontally by folds of tissue ( Fig. 83A, G View Figure 83 ). Dorsal cirri slender, present on all parapodia. Digitiform ventral cirri present in first seven (eight) chaetigers; thereafter, replaced by transverse elongate glandular pads ( Fig. 83A, C, G View Figure 83 ).

First three pairs of parapodia with dorsal fascicle of two or three simple chaetae and ventral fascicle of four or five pseudocompound falcigers ( Fig. 83H, I View Figure 83 ). Anterior falcigers with two indistinct teeth, moderately long pointed hoods and smooth shafts ( Fig. 84D View Figure 84 ). Parapodia of chaetigers 4 or 5 (chaetiger 6) with pseudocompound tapering chaetae with paired pointed hoods, but lacking distinct teeth ( Figs 83J View Figure 83 , 84E View Figure 84 ). From chaetiger 6 (chaetiger 7), pseudocompound tapering chaetae replaced by simple tapering chaetae with pointed tips, which in turn are replaced by limbate chaetae on the following unmodified parapodia ( Fig. 84A View Figure 84 ). Paired simple bidentate subacicular hooks with thin transparent hoods starting from chaetiger 19 (chaetigers 17–26) ( Fig. 84B, C, F View Figure 84 ). Pectinate chaetae thin and delicate, with slightly oblique distal margin and 12–20 small teeth ( Fig. 84G View Figure 84 ). Neuropodia with up to five or six pale transparent neuroaciculae ( Fig. 83H–J View Figure 83 , 84A–C View Figure 84 ).

Branchiae pectinate, with up to four long slender filaments ( Fig. 84B View Figure 84 ), starting at chaetiger 10 (chaetiger 9) ( Fig. 83B View Figure 83 ), and continuing to the end of the body. Short branchiae present on all chaetigers of the single posterior fragment studied.

Mandibles strong, whitish, with parallel slender shafts. Calcareous cutting plates with two distinct indentations ( Fig. 83F View Figure 83 ). Maxillae dark brown, well sclerotized; maxillary formula (based on one specimen): Mx I = 1 + 1; Mx II = 6 + 8; Mx III = 7 + 0; Mx IV = 6 + 9; Mx V = 1 + 1; Mx VI = 1 + 1 ( Fig. 83E View Figure 83 ).

Pygidium with two very long and slender anal cirri and dorsal anus ( Fig. 83D View Figure 83 ). Tubes unknown.

Distribution: West Africa, Gulf of Guinea ( Fig. 85). Depth range 80– 170 m.


Museum National d'Histoire Naturelle


Office de la Recherche scientifique et Technique Outre-mer


Museum of Zoology at the University of Bergen, Vertebrate collections


Royal British Columbia Museum - Herbarium


Mykotektet, National Veterinary Institute














Paxtonia amoureuxi

Budaeva, Nataliya & Fauchald, Kristian 2011

Onuphis amoureuxi

Intes A & Le Loeuff P 1975: 314