Osedax estcourti, Berman & Hiley & Read & Rouse, 2024

Berman, Gabriella H., Hiley, Avery S., Read, Geoffrey B. & Rouse, Greg W., 2024, New Species of Osedax (Siboglinidae: Annelida) from New Zealand and the Gulf of Mexico, Zootaxa 5443 (3), pp. 337-352 : 346

publication ID

https://doi.org/ 10.11646/zootaxa.5443.3.2

publication LSID

lsid:zoobank.org:pub:AB6A5DE3-D85B-4103-A92F-917936F19EF3

DOI

https://doi.org/10.5281/zenodo.11045283

persistent identifier

https://treatment.plazi.org/id/03EF87E8-FFDC-FFC1-FF2C-FC3BFC7AF879

treatment provided by

Plazi

scientific name

Osedax estcourti
status

sp. nov.

Osedax estcourti n. sp.

Fig. 7A, B View FIGURE 7 , 8A View FIGURE 8

Material examined. Holotype: NIWA 159436 female (GenBank COI sequence ON211943, 18S = ON220129, 28S = ON220739, H3 = ON254809), collected from a whale skull (most likely a southern minke whale Balaenoptera bonaerensis Burmeister, 1867 at 390–393 m depth on the Pukaki Rise SE of New Zealand (49.121° S; 172.136° E) GoogleMaps . Scientific trawl TAN1614, Station 9, R / V Tangaroa , December 1, 2016. Fixed and preserved in 95% ethanol.

Diagnosis and description. Live animals red, in transparent tubes on whale skull ( Fig. 7A View FIGURE 7 ). Fixed roots and palps desiccated ( Fig. 7B View FIGURE 7 ). Trunk not visible ( Fig. 7B View FIGURE 7 ). Apinnulate palps are brown, approximately 3 mm long and 1 mm wide ( Fig. 7B View FIGURE 7 ). Four palps contained inside translucent tube ( Fig. 7B View FIGURE 7 ). Roots approximately 3 mm long, 1.5 mm wide, brown, still partially embedded in white bone ( Fig. 7B View FIGURE 7 ). No dwarf males observed. The rDNC diagnosis for Osedax estcourti n. sp. was recovered as: ‘C’ at site 348, ‘G’ at site 579, and ‘G’ at site 606 of mitochondrial COI.

Distribution. Osedax estcourti n. sp. was recovered from a whale fall on the Pukaki Rise off SE New Zealand at 390– 393 m.

Etymology. Osedax estcourti n. sp. is named in remembrance of Dr. Ivan Neil Estcourt (1938–1981), benthic ecologist and the first polychaetologist researcher at the former New Zealand Oceanographic Institute (now NIWA).

Remarks. Osedax estcourti n. sp. belongs to Clade II, an apinnulate clade. Osedax estcourti n. sp. was recovered as the sister species to Osedax ventana , known from 2,898 m in Monterey Bay (California, USA), though the relationship was not well supported, with poor bootstrap support ( Fig. 2 View FIGURE 2 ). The minimum interspecific distance between O. estcourti and O. ventana was 14.6% ( Table 3 View TABLE 3 ), thus providing ample molecular evidence for it to be a new species. Two other specimens were destroyed for sequencing (ON211941, ON211942). The new species had a 1.5% maximum intraspecific pairwise distance among the three available sequences, though all three sequences showed the rDNC diagnostic bases. The haplotype network for Osedax estcourti n. sp. showed three distinct haplotypes, one for each sequence with a maximum of 10 nucleotide substitutions ( Fig. 8A View FIGURE 8 ). Specimens were not observed alive, however images of the whale skull at the time it was collected show red Osedax coating the surface ( Fig. 7A View FIGURE 7 ), suggesting that living Osedax estcourti n. sp. may have red palps.

R

Departamento de Geologia, Universidad de Chile

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Siboglinidae

Genus

Osedax

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