Functional morphology and ecology of the Arctic pogonophore Nereilinum murmanicum Ivanov, 1961 (Siboglinidae, Annelida)
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Functional morphology and ecology of the Arctic pogonophore Nereilinum murmanicum Ivanov, 1961 (Siboglinidae, Annelida)

M.M. Kanafina a*, R.I. Gabidullina b**, N.N. Rimskaya-Korsakova a***, D.V. Zakharov c,d****,

R.M. Sabirov b*****, A.V. Golikov b******

aMoscow State University, Moscow, 119991 Russia

bKazan Federal University, Kazan, 420008 Russia

cPolar Branch of the All-Russian Scientific and Research Institute of Fisheries and Oceanography, Murmansk, 183038 Russia

dMurmansk Marine Biological Institute, Russian Academy of Sciences, Murmansk, 183010 Russia

E-mail: *mariankanafina@gmail.com, **regi.gabidullina2011@yandex.ru, ***nadezdarkorsakova@gmail.com, ****zakharden@yandex.ru, *****rushan.sabirov@mail.ru, ******golikov.ksu@gmail.com

Received July 9, 2021


ORIGINAL ARTICLE

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DOI: 10.26907/2542-064X.2021.4.655-672

For citation: Kanafina M.M., Gabidullina R.I., Rimskaya-Korsakova N.N., Zakharov D.V., Sabirov R.M., Golikov A.V. Functional morphology and ecology of the Arctic pogonophore Nereilinum murmanicum Ivanov, 1961 (Siboglinidae, Annelida). Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2021, vol. 163, no. 4, pp. 655–672. doi: 10.26907/2542-064X.2021.4.655-672. (In Russian)

Abstract

This article deals with the external and internal morphology in the adult stages of Nereilinum murmanicum Ivanov, 1961, a widespread species of Siboglinidae in the Barents Sea. Since Siboglinidae is currently a taxon within the phylum Annelida, we revised the commonly held view of the body segmentation pattern typical of the species and provided the first des­cription of its opisthosoma. Furthermore, the postannular region and trophosome were structurally analyzed using histology and electron microscopy. The endodermal origin of the trophosome was suggested from its structure and position. The juvenile and larval stages of the species were described. The early larvae were found to resemble the trochophores in Annelida. The late larvae look like the late metatrochophora in Annelida and lack parapodia. The juvenile specimens retain no larval traits and are morphologically comparable to the adult stages. New data on the ecology of the species were obtained: it appears to also inhabit deeper water layers. The boundaries of its range in the Barents Sea were expanded and specified. The abundance distribution of the species in the Barents Sea (30–40 ind/m2 for the major part of the sea, up to 72–113 ind/ m2 for certain areas of the sea in particular years) was considered.

Keywords: Barents Sea, Annelida, Siboglinidae, Frenulata, Nereilinum murmanicum, morphology, trophosome, symbiotic bacteria, ontogenesis

Acknowledgments. We are grateful to the staff of the Polar Branch of the All-Russian Scientific and Research Institute of Fisheries and Oceanography for providing us with the materials on the Arctic pogonophore N. murmanicum, as well as to our colleagues from Kazan Federal University A.G. Porfiriev (PhD in Biology) and M.M. Sal'nikova (PhD in Biology), Kazan Federal University student D.N. Sharafutdinova, and Moscow State University student A.I. Yakovleva for their kind assistance during sample preparation.

N.N. Rimskaya-Korsakova and M.M. Kanafina's work was supported by the Russian Science Foundation (project no. 18-14-00141-P).

Figure Captions

Fig. 1. Functional morphology of Nereilinum murmanicum Ivanov, 1961 at different ontogenetic stages: a) opisthosoma; b) cross section of the postannular part of the trunk; c) ultrathin structure of the trophosome; d) longitudinal section of the connection between the forepart and trunk; e) embryo; f) larva at the late metatrochophora stage. Abbreviations: ba – bacteria; bv – blood vessel; cu – cuticle; ep – epithelium; fr – forepart; g1 – type 1 granules; g2 – type 2 granules; he – heterochromatin; ma – macromere; mc – circular musculature; mi – micromere; ml – longitudinal musculature; ms – celom of forepart; mt – celom of trunk; oc – opisthosomal chetae; op – opisthosoma; pe – perithoneal epithelium; ps – cephalic lobe; pt – prototroch; sp – sperm duct with spermatophores; tc – bacteriocytes; tcv – inner cavity of trophosome; td – transverse muscular diaphragm; te – telotroch; tn – bacteriocyte nucleus; tr – trunk. Scale: a, b, d, e – 100 μm; c – 2 μm; f – 200 μm.

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