Osedax ventana, Rouse & Goffredi & Johnson & Vrijenhoek, 2018

Rouse, Greg W., Goffredi, Shana K., Johnson, Shannon B. & Vrijenhoek, Robert C., 2018, An inordinate fondness for Osedax (Siboglinidae: Annelida): Fourteen new species of bone worms from California, Zootaxa 4377 (4), pp. 451-489 : 464

Osedax ventana n. sp.

Figure 4D

Osedax ‘nude-palp-B’ ( Jones et al. 2008; Rouse et al. 2011; Rouse et al. 2009; Rouse et al. 2015; Vrijenhoek et al. 2009)

Material examined. Holotype: SIO-BIC A1643 palps only (GenBank COI sequence EU235218 ), fixed in formalin preserved in ethanol, collected from cow bones deployed at 2898 meters depth in Monterey Submarine Canyon , California (36°36.606’N; 122°26.122’W) ROV Tiburon dive number 1069, Oct. 1, 2007.

Diagnosis and description. Holotype represented by fragments of four palps ( Fig. 4D ), still within a gelatinous tube. Oviduct not discerned. In life, palps reddish with two blood vessels in each, lacking obvious pinnules ( Fig. 4D ).

Distribution. Known from Monterey Bay, California from 2898 meters depth ( Table 2). It has only been found in experimentally deployed cow bones.

Etymology. This species is named (noun in apposition) for the ROV Ventana, which was used to collect many Osedax specimens.

Remarks. Osedax ventana n. sp. is known from only a single partial specimen, sequenced by Jones et al. (2008). It was found on a deployed cow bone and was not discovered during any subsequent sampling at the same site. Osedax ventana n. sp. is part of Osedax Clade II and closest relative (with low support) to Osedax ryderi n.sp., from which it shows an uncorrected divergence of 12% ( Table 4). Given the holotype is a fragment, there is little, except for its unique COI sequence, to distinguish Osedax ventana n. sp. from other Clade II species. Three other Osedax species: O. crouchi , O. nordenskjoeldi and O. rogersi , were similarly erected based on fragmented specimens and DNA data ( Amon et al. 2014).

Figures

FIGURE 4. Osedax tiburon n. sp., previously Osedax ‘nude-palp-A’; Osedax ventana n. sp., previously Osedax ‘nude-palp- B’; Osedax docricketts n. sp., previously Osedax ’nude-palp-C’. A. Lateral view of Osedax tiburon n. sp. in situ in cow bone before dissection.Elongate apinnulate (‘nude’) palps are within a gelatinous tube. B. Osedax tiburon n. sp. preserved holotype (SIO-BIC A7817), removed from cow bone, showing elongate palps clustered together, obscuring oviduct. Trunk is relatively short and ovisac and roots were largely removed for DNA sequencing.C. Osedax tiburon n. sp. preserved paratype (SIO-BIC A7818) removed from cow bone, also showing elongate palps clustered together, obscuring oviduct. D. Holotype (SIO-BIC A1643) of Osedax ventana n.sp. beforeremoval from cow bone deployed at 2898 meters depth inMonterey Canyon.Elongate apinnulate (‘nude’) palps are within gelatinous tube and are all that were retained for this species. E. Holotype (SIO-BIC A1644) of Osedax docricketts n. sp. incomplete after dissection, and before preservation.