Riseriopsis confusa ( Thiel, Purschke & Böggemann, 2011 ) Salazar-Vallejo & Zhadan & Rizzo, 2019

Salazar-Vallejo, Sergio I., Zhadan, Anna E. & Rizzo, Alexandra E., 2019, Revision of Fauveliopsidae Hartman, 1971 (Annelida, Sedentaria), Zootaxa 4637 (1), pp. 1-67 : 60

Riseriopsis confusa ( Thiel, Purschke & Böggemann, 2011) n. comb.

Fauveliopsis confusa Thiel, Purschke & Böggemann, 2011: 925–931 , Figs 1 , 2 C–F, 3, 4A–C.

TL: SE Atlantic. D: Only known from some localities in Angola and Guinea Basins, off Western Africa, 5137–5496 m.

Type material. Holotype ( ZMH P-24873), R/ V Meteor, Cruise 63/2, Stat. 89 ES-S (00°43’ N, 05°31.2’ W), 5137–5141 m, 20 Mar. 2005 . Paratypes in two lots ( ZMH P-24874), R/ V Meteor, Cruise 63/2, Stat. 89 ES-S (00°43’ N, 05°31.3’ W to 00°43’ N, 05°31.2’ W), 20 Mar. 2005 , 5137– 5141 m; and ( ZMH P-24876), R/ V Meteor, Cruise 63/2, St. 89 ES-E (00°43’ N, 05°31.3’ W to 00°43’ N, 05°31.2’ W), 5137–5141 m, 20 Mar. 2005 .

Diagnosis. Riseriopsis with up to 31 chaetigers. All chaetigers with one acicular and one capillary per ramus. Posterior chaetigers with falcate aciculars. Anal papillae abundant. GP not seen.

Remarks. Riseriopsis confusa belongs in Riseriopsis n. gen. because of its body shape, being progressively wider posteriorly, and by having almost smooth integument.

Riseriopsis confusa resembles R. santosae n. sp. because they are free living and their posterior chaetigers have hyaline chaetae. Their main differences, as indicated in the key above, involve their number of chaetigers, and the chaetal pattern in medial chaetigers. In R. confusa there are 15–31 chaetigers and medial notopodia have one acicular and one capillary per bundle, whereas in R. santosae n. sp., there are 37–88 chaetigers, and medial notopodia have only one acicular per bundle. Both species occur in the Atlantic but differ in the depth they have been found; R. confusa is an abyssal species, whereas R. santosae n. sp. occurs in shelf depths. Riseriopsis confusa was recently and thoroughly described including line drawings, histological sections and SEM photos. No further comments are needed.

Figures

FIGURE 1. Fauveliopsis adriatica Katzmann & Laubier, 1974, non-type specimens.A. Seven specimens, one in a scaphopod, three others in gastropods, and three others removed from shells (Ca: Cadulus, Ol: Olivella, Se: Seguenzia, Vi: vitrinellid, fragment), (LACM 7527). B. Another specimen (LACM 7525) preserved inside a scaphopod, methyl green stained (inset: genital papillae before chaetiger 11). C. Same, anterior end, dorsal view. D.Another specimen (LACM 7525), mature female, preserved within a gastropod shell. Scale bars: A: 1.6 mm, B: 0.9 mm, C: 140 µm, D: 0.6 mm.

FIGURE 2. Fauveliopsis armata Fauchald & Hancock, 1981, paratypes (LACM 1161). A. Methyl green stained, dorsal view, stereoscope. B. Same, dorsal view, compound microscope. C. Same, right side of anterior end. D. Same, posterior end, dorsal view. Scale bars: A, B: 250 µm, C: 60 µm, D: 80 µm.