Leitoscoloplos Day, 1977

Blake, James A., 2020, New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea, Zootaxa 4730 (1), pp. 1-61 : 6

publication ID	https://doi.org/10.11646/zootaxa.4730.1.1
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scientific name	Leitoscoloplos Day, 1977
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Genus Leitoscoloplos Day, 1977 View in CoL

Type-species: Haploscoloplos bifurcatus Hartman, 1957 , designated by Day 1977.

Diagnosis. (after Blake 2017) Prostomium pointed, conical; peristomium typically with one achaetous ring, but with additional superficial annulae on some species. Branchiae lacking, or present from posterior thoracic, transitional, or abdominal setiger. Posterior thoracic setigers with 0–2 postsetal lobes and 0–2 subpodial lobes; abdominal setigers with 0–4 subpodial papillae; stomach papillae rare, interramal cirri present or absent. Thoracic neurosetae only crenulated capillaries. Without abdominal neuropodial spines, with 2–3 imbedded aciculae present or absent. Notopodial furcate setae present or absent in abdominal segments.

Remarks. Blake (2017) referred 27 species to Leitoscoloplos . Five new species of Leitoscoloplos : L., cliffordi n. sp., L. gordaensis n. sp., L. lunulus n. sp., L. sahlingi n. sp., and L. williamsae n. sp. have been discovered from deep-water habitats in the northeastern Pacific and are here described. These five new species bring the total number of known species of Leitoscoloplos to 32. Four of the new species belong to the L. kerguelensis ( McIntosh, 1885) group as defined by Blake (2017), in which the branchiae begin on an anterior abdominal segment. The fifth species, L. sahlingi n. sp., is in a group that includes L. pugettensis ( Pettibone, 1957) , in which branchiae are first present from a posterior thoracic segment.

Seven species of Leitoscoloplos occur along the continental margin of the northeastern Pacific Ocean in depths of about 750 m or greater. In order to help readers separate these deep-water species, a key is presented here. Additional data on deep-water Leitoscoloplos from a global perspective is presented in the Discussion at the end of this paper.

References

Blake, J. A. (2017) Polychaeta Orbiniidae from Antarctica, the Southern Ocean, the abyssal Pacific Ocean, and off South Amer- ica. Zootaxa, 4218 (1), 1 - 145. https: // doi. org / 10.11646 / zootaxa. 4218.1.1

Day, J. H. (1977) A review of the Australian and New Zealand Orbiniidae (Annelida: Polychaeta). In: Reish, D. J. & Fauchald, K. (Eds.), Essays on Polychaetous Annelids in Memory of Dr. Olga Hartman. Allan Hancock Foundation, University of Southern California, Los Angeles, pp. 217 - 246.

Hartman, O. (1957) Orbiniidae, Apistobranchidae, Paraonidae and Longosomidae. Allan Hancock Pacific Expeditions, 15 (3), 211 - 393, pls. 20 - 44, 1 chart. [https: // biodiversitylibrary. org / page / 4160176]

McIntosh, W. C. (1885) Report on the Annelida Polychaeta collected by H. M. S. Challenger during the years 1873 - 76. Challenger Reports, 12, 1 - 554, pls. 1 - 55 + 1 a- 39 a. [https: // biodiversitylibrary. org / page / 50688432]

Pettibone, M. H. (1957) North American genera of the family Orbiniidae. Journal of the Washington Academy of Science, 47, 159 - 167, 4 figs. [https: // biodiversitylibrary. org / page / 39753528]