Onchidorididae (J. E. Gray, 1854)

Broms, Fredrik, 2024, Diversity of nudibranchs in shallow water habitats in the region of Tromsø, northern Norway, Fauna norvegica 43, pp. 84-109 : 90-92

publication ID	https://doi.org/10.5324/fn.v43i0.5840
persistent identifier	https://treatment.plazi.org/id/03D0903A-C53B-B812-EC81-1AFA0A71FD2A
treatment provided by	Felipe
scientific name	Onchidorididae (J. E. Gray, 1854)
status

Treatment

Family Onchidorididae (J. E. Gray, 1854) View in CoL

Acanthodoris pilosa (Abildgaard, 1789) Figure 2D View Figure 2

Material examined: One specimen, ESU, 29 September 2021, FB, NTNU-VM-85732/NUIT-1063 ; One specimen, ESU, 14 October 2021, FB, NTNU-VM-84417/NUIT-1002 ; One specimen, UTE, 17 November 2021, 16 mm, FB, NTNU-VM-84546/NUIT-1019 ( Figure 2D View Figure 2 ) ; One specimen, UTE, 04 June 2022, 18 mm, FB, NTNU- VM-85670/NUIT-1174 ; One specimen, UTE, 04 July 2022, 29 mm, FB, NUIT-1184 ; Two specimens, UTE, 28 October 2022, 19, 18 mm, FB, NUIT-1239, NUIT-1240 .

Localities: EKJ, ESU, HIL, SGU, TLA, TTE, UTE

Distribution and remarks: Acanthodoris pilosa is a commonly occurring species along the entire Norwegian coast ( Evertsen & Bakken 2005, Artskart 2024). It is also fairly common along the Murman coast in Russia ( Martynov et al. 2006). In Tromsø, animals were observed all year round in the intertidal. Animals were mainly found associated with the bryozoan Flustrellidra hispida Fabricius, 1780 in the Ascophyllum nodosum belt. This study verifies the presence of A. pilosa in the Tromsø region.

Onchidoris bilamellata (Linnaeus, 1767) Figure 2E View Figure 2

Material examined: One specimen, SGU, 24 May 2020, FB, photographic record ( Figure 2E View Figure 2 ) ; Three specimens, TVK, 12 December 2021, 27, 18, 22 mm, FB, NTNU-VM-85734/NUIT-1079, NUIT-1080, NTNU-VM-84587/NUIT-1081 ; One specimen, HIL, 03 December 2022, 30 mm, FB, NUIT-1253 .

Localities: EKJ, ESU, HAK, RAK, SGU, SHE, THA, TLA, TTE, TVK, UTE

Distribution and remarks: Onchidoris bilamellata occur along the entire Norwegian coast ( Evertsen & Bakken 2005; Artskart 2024) and has also been recorded in Russia ( Martynov et al. 2006). In the present study, animals were found both in the intertidal and at fouling communities. The species was recorded all year round. Spawning was frequently observed in spring and autumn. Animals were mainly associated with the barnacles Balanus crenatus Bruguière, 1789 and Balanus balanus Linnaeus, 1758 . The present records are the first published records from the Tromsø region.

Onchidoris muricata (Müller, 1776) Figure 2F View Figure 2

Material examined: One specimen, THA, 06 November 2021, 16 mm, FB, photographic record ( Figure 2F View Figure 2 ) ; One specimen, KVA, 14 November 2021, 11 mm, FB, NTNU-VM-85737/NUIT-1027 ; One specimen, THA, 25 November 2021, 14 mm, FB, NTNU-VM-84488/ NUIT-1069 ; One specimen, EKJ, 06 March 2022, 17 mm, FB, NUIT-1145 .

Localities: EKJ, ESU, HIH, HIL, KVA, RAK, SHE, THA, TPO, TPR, TTE, TVK, UTE

Distribution and remarks: Onchidoris muricata is widely distributed along the entire Norwegian coast ( Evertsen & Bakken 2005). The present study found the species to be commonly occurring at all months of the year where it was predominantly found on Saccharina latissima at fouling community localities.