Fauveliopsis magna Fauchald & Hancock, 1981

Salazar-Vallejo, Sergio I., Zhadan, Anna E. & Rizzo, Alexandra E., 2019, Revision of Fauveliopsidae Hartman, 1971 (Annelida, Sedentaria), Zootaxa 4637 (1), pp. 1-67 : 29-30

Fauveliopsis magna Fauchald & Hancock, 1981

Figure 15

Fauveliopsis magna Fauchald & Hancock, 1981: 38 ; Blake & Petersen, 2000: 41–43, Fig. 3.5 (redescr.).

Fauveliopsis glabra: Fauchald & Hancock 1981: 38 (partim).

TL: Off central Oregon, 2800 m dept. D: Restricted to type locality.

Type material: Northeastern Pacific, Oregon. Holotype ( LACM 1149 ), Cascadia Abyssal Plain, Sta. AD 9, NAD21 (44°36.4’ N, 125°24.8’ W), 2800 m, 13 Aug. 1962, A.D. Carey, coll. (body pierced to be illustrated in dorsal view, this explains the dorsal depression, body wall broken along a few chaetigers in the posterior region; 8 mm long, 1 m wide, 41 chaetigers, GP on posterior part of chaetiger 12).

Additional material. Northeastern Pacific, Oregon. One specimen ( LACM 7595 ), without anterior end, Cascadia Abyssal Plain, Sta. AD 110, NAD 21(44°40.1’ N, 125°34.0’ W to 44°40.0’ N, 125°35.0’ W), 2798 m, 11 Aug. 1964 .

Diagnosis. Fauveliopsis with 41 chaetigers. Integument with fine papillae giving a velvety appearance. Interramal papillae oval. Median chaetigers with one acicular and one capillary per bundle. Last 11 chaetigers with more chaetae, up to three aciculars and up to three capillaries per bundle. Chaetal formula: 1A1c/1c1A (ant.), 1A1c/1c1A (med.), 3A2–3c/2–3c3A (post.). GP on posterior margin of chaetiger 12. In tubular, agglutinated foraminiferan tests ( Psammosiphonella ).

Remarks. As indicated above, Fauveliopsis magna is similar to F. adriatica because both have genital papillae (GP) on the right side, and a papillated body surface; their main differences involve the chaetiger where GP are present, and the number of chaetae along posterior chaetigers. Fauveliopsis magna has GP before chaetal lobe of chaetigers 13 or 14, and only 2–3 capillaries in posterior chaetigers, whereas in F. adriatica GP are present before chaetiger 11, and there are 3–8 capillaries in posterior chaetigers.

Blake & Petersen (2000) redescribed the species based upon the holotype. The holotype ( Fig. 15A ) is complete, slightly damaged, blunt anteriorly, tapered posteriorly; some portions of the integument are lost ( Fig. 15B ), or some parapodia have been previously removed ( Fig. 15C ). Their additional material indicated above included specimens 5.0– 11.8 mm long, but the number of chaetigers varied little (37–39 chaetigers), whereas the GP was only present in one single chaetiger (12 or 13) ( Fig. 15B , arrow). Fauveliopsis magna and F. glabra are similar but differ because of the relative position of the genital papillae, and especially the development of the posterior parapodia, being depressed in F. glabra , whereas in F. magna they are projected from the body wall.

Figures

FIGURE 15. Fauveliopsis magna Fauchald & Hancock, 1981, holotype (LACM 1149). A. Slightly oblique lateral view. B. Anterior region, oblique left, lateral view, methyl green stained (arrow points to genital papilla). C. Posterior region, left lateral view. Scale bars: A: 1.2 mm, B: 0.3 mm, C: 0.4 mm.