Laubieriopsis cabiochi ( Amoureux, 1982 )

Salazar-Vallejo, Sergio I., Zhadan, Anna E. & Rizzo, Alexandra E., 2019, Revision of Fauveliopsidae Hartman, 1971 (Annelida, Sedentaria), Zootaxa 4637 (1), pp. 1-67 : 48-49

Laubieriopsis cabiochi ( Amoureux, 1982)

Figures 29 , 30

Fauveliopsis cabiochi Amoureux, 1982: 192–194 , Fig. 3 .

Laubieriopsis cabiochi: Petersen 2000: 503–512 , Fig. 2 A–K, N–P, Tables 2, 3 (n. comb., redescr.).

TL: Northeastern Atlantic; not further specified, specimens originally regarded as syntypes. D: Only known from the original stations.

Type material ( lectotype selected by M.E. Petersen): NE Atlantic, Continental slope S off Ireland: Lectotype (MNHN AS 417a), and 4 paralectotypes ( MNHN AS 417b), R/ V Thalassa, Cruise 1973, Sta. Z 457 (48°38’02” N, 09°52’06’ ‘W), 800 m, soft mud, compact lumps (not found in MNHN, probably lost) . One syntype ( MNHN 736 ), and four syntypes ( MNHN 737 ), no further data (body 5.5–7.3 mm long, 0.4–0.7 mm wide, 21 chaetigers; ovaries along 7–12 chaetigers, from chaetigers 3–7, size dependent) . Other syntypes ( MNHN 738 ) (lumped from different stations; field data unavailable; two small specimens with anterior end and pharynx exposed; a few specimens in better condition 2.3–9.0 mm long, 0.2–0.7 mm wide, 19–22 chaetigers; two females had single ovaries along chaetigers 6(7)–17(18), one male with testes running along chaetigers 7–17.)

Additional material. Northwestern Atlantic Ocean. 24 specimens ( LACM 7492 ), R/ V Atlantis, Sta. A 118 (32°19.4’ N, 64°34.9’ W to 32°19.0’ N, 64°34.8’ W), 1135–1153 m, 18 Aug. 1966, H. Sanders, coll. (11 complete, 3 for SEM; body 4.3–8.2 mm long, 0.3–0.4 mm wide, 21 chaetigers; GP not seen, oocytes in three specimens, in chaetigers 7–13; 7 out of 11 complete specimens with bidentate aciculars in anterior 3–4 chaetigers; others with tips entire) .

Diagnosis. Laubieriopsis with 21 chaetigers. Integument sparsely, finely papillose anteriorly ( Fig. 29A, B ), and posteriorly ( Fig. 29H ), medially smooth ( Fig. 29E ). Pharynx barrel-shaped ( Fig. 29C ). First five chaetigers with only 3–4 aciculars, with tips mostly bidentate ( Fig. 29D ), per bundle, each spinulose with smooth tip. Median and posterior parapodia with one acicular and one capillary per bundle. Interramal papillae sessile, globose. Genital papillae on posterior margin of chaetiger 8, fusiform, with a large central depression ( Fig. 29F, G ). Pygidium bilobed, with two larger and two smaller anal papillae ( Fig. 29H, I ).

Remarks. Laubieriopsis cabiochi is, as indicated in the key above, unique in the genus by having 20–21 chaetigers. The anterior aciculars are bidentate, and genital papillae are unpaired, in chaetiger 8. Laubieriopsis norvegica is similar in having 21 chaetigers and bidentate aciculars along anterior chaetigers, but they differ in the type of genital papillae (GP). In L. cabiochi GP are unpaired, as already indicated, whereas they are duplicated in L. nor- vegica.

Body ends were reversed in the original description. This was corrected and the species was redescribed by Petersen (2000). Magalhães et al. (2014:148) recorded a similar species from Hawaii as L. cf. cabiochi and pointed out their specimens might belong to a different species. We agree. There are several differences, besides the fact that Hawaiian specimens are apparently juveniles: their chaetae are shorter, including those present in last chaetiger, and the annulations present in last chaetigers are fewer in number and shallower than those present in L. cabiochi .

Figures

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.

FIGURE 3. Fauveliopsis brattegardi Fauchald, 1972a, holotype (ZMUB 52205). A. Dorsal view. B. Oblique, dorsal view. C. Anterior end, oblique dorsal view. D. Posterior end, dorsal view. Scale bars: A, B: 160 µm, C: 45 µm, D: 65 µm.

FIGURE 29. Laubieriopsis cabiochi (Amoureux, 1982), non-type specimens (LACM 7492). A. Anterior end, dorsal view. B. Another specimen, right lateral view with anterior end exposed and pharynx everted (Ph: pharynx). C. Same, seen from above (Ph: pharynx). D. Anterior slightly bidentate acicular. E. Chaetigers 5–6, right lateral view. F. Same, chaetiers 7–8, right lateral view (asterisk indicates genital papilla). G. Same, close-up of genital papilla. H. Posterior end, right lateral view. I. Another specimen, posterior end, right lateral view. Scale bars: A: 160 µm, B, C: 70 µm, D: 5 µm, E 140 µm, F: 120 µm, G 50 µm, H: 110 µm, I: 80 µm.

FIGURE 30. Laubieriopsis cabiochi (Amoureux, 1982), non-type specimen (LACM 7492), longitudinally dissected, body wall marginally infolded. A. Anterior region, asterisk indicates testis (inset: close-up of sperm). B. Median region. C. Posterior region. Scale bars: A–C: 90 µm, inset: 8 µm.