Fauveliopsis rugosa Fauchald, 1972b

Salazar-Vallejo, Sergio I., Zhadan, Anna E. & Rizzo, Alexandra E., 2019, Revision of Fauveliopsidae Hartman, 1971 (Annelida, Sedentaria), Zootaxa 4637 (1), pp. 1-67 : 34-35

publication ID

https://doi.org/ 10.11646/zootaxa.4637.1.1

publication LSID

lsid:zoobank.org:pub:5A43797A-FDDA-4AD4-928E-C407D659B8F0

persistent identifier

https://treatment.plazi.org/id/815D710F-FFA8-FFF8-A5A6-3562FABCF957

treatment provided by

Plazi

scientific name

Fauveliopsis rugosa Fauchald, 1972b
status

 

Fauveliopsis rugosa Fauchald, 1972b View in CoL

Figures 19 View FIGURE 19 , 20 View FIGURE 20

Fauveliopsis rugosa Fauchald, 1972b: 220–222 View in CoL , Pl. 45, Figs. a–e; Méndez 2006: 781, Tab. 2, page 779.

TL: Off Natividad Island, Baja California, México, 1740 m. D: Cedros Island to Marías Islands, México, 820–2650 m .

Type material: Northeastern Pacific Ocean. Western Mexico. Holotype ( LACM 990 About LACM ) and 8 paratypes ( LACM 991 About LACM ), off Isla Natividad, Baja California, R/ V Velero IV, Sta. 7229 (27°54’25” N, 115°40’00” W), 1751– 1724 m, green mud, 31 Dec. 1960 (paratypes four complete, three with body segments long; body 2.1–5.2 mm long, 0.3–0.8 mm wide, 23–30 chaetigers; GP or oocytes not seen). GoogleMaps

Additional material. Northeastern Pacific Ocean. Western Mexico. One specimen ( LACM 7588 About LACM ), off Natividad Island, R / V Velero IV, Sta. 7229 (27°54’25” N, 115°40’00” W), 1751, green mud, piston corer, 31 Dec. 1960 (twisted, posterior region broken, lost; GP or oocytes not seen) GoogleMaps . One specimen ( LACM 7590 About LACM ), off Natividad Island, R / V Velero IV, Sta. 7236 (27°44’33” N, 115°24’ 05” W), 540 m, mud, rock, piston corer, 2 Jan. 1961 (twisted, difficult to measure; GP on posterior margin of chaetiger 12; oocytes loosely floating in coelom, visible towards posterior region) GoogleMaps

.

Diagnosis. Fauveliopsis with 23–35 chaetigers. Anterior chaetigers with a transverse series with 5–6 spherical papillae. Ventral integument rugose. Interramal papillae pyriform, pedunculate. First chaetiger with larger aciculars in both rami, slightly larger in neuropodia. Median chaetigers with one acicular and one capillary per bundle. Chaetal formula: 1A1–2c/1–2c1A (ant.), 1A1c/1c1A (med.), 1A1c/1c1A (post.). GP on right side of chaetiger 12.

Observations. Holotype (LACM 990) an anterior fragment with 10 very long chaetigers (originally complete, 5.5 mm long, 0.5 mm wide, 35 chaetigers). Body cylindrical, slightly swollen anteriorly ( Fig. 19A, B View FIGURE 19 ), segments slightly longer than wide, progressively longer ( Fig. 19C View FIGURE 19 ); integument rugose with 5–6 rings, and additional larger papillae. Prostomium and peristomium not exposed. First four chaetigers with one acicular and one capillary per rami, aciculars curvature progressively attenuated, becoming almost straight by chaetiger 5. Chaetigers 5–11 longer, 2–4 times longer than wide, with segments 6–8 the longest. GP single, right posterior margin of chaetiger 9, just before chaetae of chaetiger 10 ( Fig. 19D View FIGURE 19 ). Posterior region sometimes damaged, different from a shield or other anchoring modification.

Observations by SEM of two other specimens allow some additional comments. There are three anterior chaetigers with aciculars, and capillaries start from chaetiger 4 ( Fig. 20A View FIGURE 20 ). Body integument rugose throughout venter ( Fig. 20A, C, G View FIGURE 20 ), but variable in posterior region depending upon the fixation was made over a smooth surface; if so, venter smoother ( Fig. 20 E, F View FIGURE 20 ), and anal plate subpentagonal with three larger papillae above anus and marginal papillae along the upper and lateral margins ( Fig. 20G View FIGURE 20 ). Genital papilla digitate, on right side, placed in posterior margin of chaetiger 12 ( Fig. 20A View FIGURE 20 , B–D).

Remarks. Fauveliopsis rugosa differs from other species in the genus having only two chaetae per rami and more than 15 chaetigers, by having body surfaces with different rugosity; its dorsum is rugose, and its venter is papillated.

Chaetal features were apparently confused in the original description ( Fauchald 1972b:221): “the first setiger has one large spine in each neuropodium, each of the first notopodia has 2 thinner spines.” The holotype is an anterior fragment with segments 1.5 times longer than wide. The paratypes include eight specimens. An interesting derivation of these apparently relaxed specimens is that fauveliopsids could considerably extend their bodies without leaving their shelter. This can explain the observations of specimens regenerating their anterior ends. Méndez (2006:781) found members of this species in scaphopod shells ( Fissidentalium megathyris or Rhabdus dalli ).

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Terebellida

Family

Fauveliopsidae

Genus

Fauveliopsis

Loc

Fauveliopsis rugosa Fauchald, 1972b

Salazar-Vallejo, Sergio I., Zhadan, Anna E. & Rizzo, Alexandra E. 2019
2019
Loc

Fauveliopsis rugosa

Mendez, N. 2006: 781
2006
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