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Issue: Vol. 5492 No. 4: 7 Aug. 2024
Type: Article
Published: 2024-08-07
DOI: 10.11646/zootaxa.5492.4.2
Page range: 505-529
Abstract views: 6
PDF downloaded: 1

A new genus and two new species of brooding chitons (Mollusca: Polyplacophora) from the North-Western Pacific

Zoological Institute of Russian Academy of Sciences; Universitetskaya nab. 1; 199034; St. Petersburg; Russian Federation
Mollusca Kaasichiton Leptochitonidae Leptochiton new genus new species Sea of Okhotsk Bering Sea Kurile Islands

Abstract

Kaasichiton n. gen. from the northwestern part of the Pacific Ocean is described here. The genus includes four species, all of them are brooding. Two of them, K. lukini and K. incubatus, are transferred from the genus Leptochiton to the new genus, two more, K. ionensis n. sp. and K. kamchatkensis n. sp., are described as new. The new species increase the number of brooding chiton species to 44. Species of the new genus display a considerable variability regarding radular features. This has implications for the significance of these features within other genera, for which a similar variability has been observed.

 

References

  1. Berg, L.S. (1920) Bipolar distribution of the organisms and a glacial epoch. Izvestija Academii Nauk SSSR, 14, 273–302.
  2. Bergenhayn, J.R.М. (1955) Die fossilen schwedischen Loricaten nebst einer vorläufigen Revision des Systems der ganzen Klasse Loricata. Lunds Universitets Årsskrift, Neue Folge, Adv., 2, 51 (8), 1–41.
  3. Bouchet, P., Héros, V., Lozouet, P. & Maestrati, P. (2008) A quarter century of deep-sea malacological exploration in the South and West Pacific: Where do we stand? How far to go? In: Héros, V., Cowie, R.H. & Bouchet, P. (Eds.), Tropical Deep-Sea Benthos. Vol. 25. Mémoires du Muséum national d’Histoire naturelle, 196, pp. 9–40.
  4. Dall, W.H. (1889) Report on the results of dredging, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877–78) and in the Caribbean Sea (1879–80), by the United States Coast Survey Steamer „Blake,” Lieutenant- Commander C.D. Sigsbee, U.S.N., and Commander J.R. Bartlett, U.S.N., commanding. Report on the Mollusca, Pt. 2: Gastropoda and Scaphopoda. Bulletin of the Museum of Comparative Zoology, 18, 1–492.
  5. Eernisse, D.J. (2004) Revival of the genus Cyanoplax Pilsbry, 1982 for a clade of West Coast chitons [abstract]. In: Martinez, J.C. & Yomans, R.V. (Eds.), Program and Abstracts of the 37th Annual Meeting of the Western Society of Malacologists. Ensenada, Baja California, pp. 33–35.
  6. Egorova, E.N. (2007) New data against the bipolar status of the genus Amauropsis (Naticidae, Mollusca) with a description of the new genus Pseudamauropsis from Antarctic region. Zoological Journal, 86 (1), 16–29. https://doi.org/10.31610/zsr/2007.16.2.153
  7. Gray, J.E. (1821) A natural arrangement of Mollusca according to their internal structure. London Medical Repository, 15, 221–239.
  8. Haddon, A.C. (1886) Report on the Polyplacophora collected by H. M. S. „Challenger” during the years 1873–1876. Challenger Report, 15 (43), 1–50.
  9. Kaas, P. & Van Belle, R.A. (1985) Monograph of living chitons. Vol. 1. Order Neoloricata: Lepidopleurina. E.J. Brill/W, Backhuys, Leiden, 240 pp. https://doi.org/10.1163/9789004431676_001
  10. Kaas, P. & Van Belle, R.A. (1994) Monograph of living chitons. (Mollusca: Polyplacophora). Volume 5. Ischnochitonidae: Ischnochitoninae (concluded), Callistoplacinae; Mopaliidae. Additions to Vols. 1–4. E. J. Brill, Leiden, 402 pp. https://doi.org/10.1163/9789004431713
  11. Pilsbry, H.A. (1892) Monograph of the Polyplacophora. In: Tryon Jr., G.W. (Ed.), Manual of Conchology, structural and systematic. Series 1. 14 (53). Academy of Natural Sciences, Philadelphia, Pennsylvania, pp. 1–64, pls. 1–15.
  12. Sigwart, J.D., Schwabe, E., Saito, H., Samadi, S. & Giribet, G. (2011) Evolution in the deep sea: a combined analysis of the earliest diverging living chitons (Mollusca: Polyplacophora: Lepidopleurida). Invertebrate Systematics, 24 (6), 560–572.
  13. https://doi.org/10.1071/IS10028
  14. Sirenko, B.I. (1973) A new genus of the family Lepidopleuridae (Neoloricata). Zoological journal, 52 (10), 1569–1571, figs 1–16. [in Russian]
  15. Sirenko, B.I. (1977) Vertical distribution of chitons of the genus Lepidopleurus (Lepidopleuridae) and its new ultraabyssal species. Zoological journal, 56 (7), 1107–1110. [in Russian]
  16. Sirenko, B.I. (1990) New species of chitons of the genus Leptochiton (Mollusca, Polyplacophora) of the shelf and the slope of the Kurile Islands. Proceedings of the Zoological Institute RAS, 218, 96–103. [in Russian]
  17. Sirenko, B.I. (1992) Nierstraszellidae fam. nov. - a new family of chitons (Polyplacophora, Lepidopleurida) from the bathyal of Western Pacific. Ruthenica, 2, 81–90.
  18. Sirenko, B.I. (2013) Check-list of species of free-living invertebrates of the Russian Far Eastern seas. Explorations of the Fauna of the Seas, 75 (83), 1–256.
  19. Sirenko, B.I. (2015) The enigmatic viviparous chiton Calloplax vivipara (Plate, 1899) (Mollusca: Polyplacophora) and a survey of the types of reproduction in chitons. Russian Journal of Marine Biology, 41 (1), 24–31. https://doi.org/10.1134/S1063074015010095
  20. Sirenko, B.I. (2017) Two new species of the genus Leptochiton (Mollusca, Polyplacophora) from North-West Pacific. Russian Journal of Marine Biology, 43 (2), 111–117.
  21. https://doi.org/10.1134/S1063074017020109
  22. Sirenko, B.I. (2023) Indonesian chitons of the genera Belknapchiton Sirenko, Saito & Schwabe, 2022 and Leptochiton Gray, 1847 (Mollusca: Polyplacophora: Leptochitonidae). Ruthenica, 33 (2), 79–94.
  23. https://doi.org/10.35885/ruthenica.2023.33(2).4
  24. Sirenko, B.I. & Sigwart, J.D. (2021) Leptochiton subrugatus sp. nov. (Mollusca: Polyplacophora) from low boreal waters of northern Pacific. Marine Biodiversity, 51 (64). [unknown pagination]
  25. https://doi.org/10.1007/s12526-021-01190-z
  26. Sirenko, B. Saito, H. & Schwabe, E. (2022) A redescription of Leptochiton belknapi Dall, 1878 (Mollusca: Polyplacophora: Leptochitonidae), the type species of the new genus Belknapchiton. Zootaxa, 5205 (2), 101–124. https://doi.org/10.11646/zootaxa.5205.2.1
  27. Sirenko, B.I. & Sigwart, J.D. (2022) The forgotten species Leptochiton alascensis (Thiele, 1909) (Mollusca: Polyplacophora) and its relatives. Archiv für Molluskenkunde, 151 (2), 119–130. https://doi.org/10.1127/arch.moll/151/119-130
  28. Sowerby, G.B. III (1903) Mollusca of South Africa. Marine Investigations in South Africa, 2 (3), 213–232. https://doi.org/10.5962/p.366539
  29. Stepanjants, S.D., Cortese, G, Kruglikova, S.B. & Bjørklund, K.R. (2006) A review of bipolarity concepts: History and examples from Radiolaria and Medusozoa (Cnidaria). Marine Biology Research, 2, 200–241. https://doi.org/10.1080/17451000600781767
  30. Thiele, J. (1909) Revision des Systems der Chitonen, Part I. Zoologica, Stuttgart, 22, 1–70. https://doi.org/10.5962/bhl.title.11245