Punctulum flavum ( Okutani, 1964 )

Hasegawa, Kazunori, 2022, Bathyal Rissoidae (Gastropoda: Rissooidea) off the Russian Far East coast of the Sea of Japan, with redescription of Punctulum reticulatum Golikov, 1986, Ruthenica, Russian Malacological Journal 32 (2), pp. 85-92 : 88

publication ID

https://doi.org/ 10.35885/ruthenica.2022.32(2).5

DOI

https://doi.org/10.5281/zenodo.11041127

persistent identifier

https://treatment.plazi.org/id/03F65E35-FFBE-3D4C-FCD8-0F60A7F5F814

treatment provided by

Felipe

scientific name

Punctulum flavum ( Okutani, 1964 )
status

 

Punctulum flavum ( Okutani, 1964) View in CoL

( Fig. 2 G–I View FIG )

Microstelma flava Okutani, 1964: 389–390 View in CoL , pl. 6, fig. 5 (see Hasegawa [2014] for more detailed synonymy).

Material examined. SoJsBio A 2-10, MIBM 14270 ( Fig. 2 G–H View FIG ); SoJsBio A 3-10, MIBM 39344; SoJsBio A 3-11, MIBM 39335; SoJaBio A 6-7, MIBM 39334 ( Fig. 2 I–J View FIG ); SoJaBio A6-8, MIBM 14412; SoJaBio B 6-6, MIBM 39346; SoJaBio B 6-7, MIBM 14492; SoJaBio B 7-6, MIBM 39345; SoJaBio B 7-7, MIBM 39341 [depth range: 470–2555 m].

Additional material examined (cited from Hasegawa, 2014). IORAN, non-registered, R/ V Vityaz st. 6649, Peter the Great Bay, 42°37.4’N, 134°19.2’E –42°37.8’N, 134°18.5’E, 1186– 1130 m GoogleMaps .

Distribution. Off the Primorsky Krai coast on the northern slope, and from off Rebun Island to the southernmost part of the southeastern slope in the Sea of Japan; the western Okhotsk Sea and Pacific coast of the Japanese archipelago south to Kyushu. Depth range in the Sea of Japan is 200–2027 m.

Remarks. On both the northern and southeastern slopes of the Sea of Japan, two distinct phenotypes have been recognized in this species that are distinguished by the depth of their habitat [ Hasegawa, 2014]. Down to ca. 1,000 m, specimens possess a low conical shell, with strong axial and spiral sculpture (the “shallow-water form”; Fig. 2G, H View FIG ), while those from deeper stations possess a more inflated shell with very much weaker sculpture (the “deep-water form”; Fig. 2I, J View FIG ). Furthermore, there is a correlation between the size of the protoconch and depth, with the “deep-water form” tending to have a larger protoconch. These two forms are still considered conspecific here because of the presence of intermediate forms at around 1,000 m. However, Criscione et al. [2019] indicated the presence of two genetically slightly distinct specimens identified as P. flavus and P. cf. flavus in their analysis and if the latter corresponds to the “deep-water form”, the two may be separable as distinct species.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Rissoidae

Genus

Punctulum

Loc

Punctulum flavum ( Okutani, 1964 )

Hasegawa, Kazunori 2022
2022
Loc

Microstelma flava

Okutani, T. 1964: 390
1964
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