Jordaniella nivosa ( Montagu, 1803 )

Høisaeter, Tore, 2014, The Pyramidellidae (Gastropoda, Heterobranchia) of Norway and adjacent waters. A taxonomic review, Fauna norvegica 34, pp. 7-78 : 41-42

Jordaniella nivosa ( Montagu, 1803)

Figures 68 -69

Turbo nivosus - Montagu 1803:326

Chemnitzia nivosa (Montagu) - Clark 1855

Odostomia nivosa (Montagu) - Jeffreys 1867; Marshall 1899, 1918; van Aartsen & al. 1984; Høisaeter 1986

Odostomia (Jordaniella) nivosa (Montagu) - Winckworth 1932; van Aartsen 1987

Jordaniella nivosa (Montagu) - Fretter et al. 1986; Graham 1988; Smith & Heppell 1991; Schander et al. 2003

Chrysallida nivosa (Montagu) - Peñas et al. 1996; Høisaeter 2009

Ptychostomon (Ondina) nivosum (Montagu) - Kobelt 1903

Odostomia cylindrica Alder, 1844:327 - Forbes & Hanley 1850 - 51; Jeffreys 1859

Type material: BMNH (Montagu’s type, with “nivosus ” in his handwriting, is still preserved in the British Museum, Jeffreys 1867:117) .

Type locality: Devonshire , Great Britain ( Peñas et al. 1996)

Material seen: Norway - Hordaland, 19 spms.

Diagnosis: Shell: ( Figure 68 ) small (max. 2.1 mm), almost cylindrical. Suture channeled. Sculpture restricted to one or two spiral grooves, just above the suture, in addition to rather coarse prosocline growth lines. Protoconch intorted (type B). Aperture oval. Columellar tooth weak and retracted. Soft parts: Most specimens with dark (chocolate brown) digestive gland, filling all whorls, except the body whorl. Some specimens with grayish, greatly diminished digestive gland. Colour of alcohol conserved animal, grayish yellow. Eyes distinct, fairly far apart (distance between eyes double of eye diameter). Operculum: Thin, yellowish, translucent, elongated, slightly kidney-shaped. No internal ridge visible on operculum in situ.

Biology: Not known, but in this investigation only found on the stipes of Laminaria hyperborea (with much epifauna) in a semiexposed locality, 1 to 3 m depth.

Distribution: Not previously reported from Norway. In my material 19 specimens from a rather exposed locality near Lyroddane outside Sotra (60°10’N) in 1992. Outside Norway it is recently reported from Laesø, Kattegat ( Olesen 2005), but not yet recorded from Sweden. It is further recorded from the Scottish North Sea coast ( McKay & Smith 1979), Shetland, the outer Hebrides and the Scottish and British west coast, western Ireland and the south coast of the British Isles and the Channel Isles ( Jeffreys 1867). Found also further south on the European Atlantic coast and occurring abundantly in the Strait of Gibraltar, but not in the western Mediterranean proper (van Aartsen et al. 1984, Peñas et al. 1996).

Remarks: Van Aartsen(1987) placed this species in Odostomia , but the molecular analyses of Schander et al. (2003) suggested that J. nivosa is closer related to Liostomia and Parthenina , and only distantly related to Odostomia s.s.

Figures

Figure 68. Jordaniella nivosa. Two specimens from Laminaria hyperborea stipes, sheltered locality at Lyroddane outside Sotra, 60°10’N, 04°59.2’E, c. 2 m, 1.8 and 1.45 mm (F1S, 16/9 1992). Figure 69. Jordaniella nivosa. SEM photographs of details of protoconch and spiral groove of the right specimen in Figure 66. Figure 70. Jordaniella truncatula. A shell (2.4 mm) from England (ZMBN 15744). Friele det. Figure 71. Ondina coarctata. From left: holotype NHMO D1126, 5.2 mm, a specimen from Nordfjorden in Rødøy, (Nordland), 66°34.3’N 13°30.5’E, 15-11 m, 4.0 mm (N 15-84), and one from Hammerfest, 90-110 m (ZMBN 21623), 3.65 mm. Figure 72. Ondina divisa, a specimen from near Grimstad (Aust Agder), 58°19’N, 1.75 mm (G 106-71). Figure 73. Ondina divisa. Three specimens showing geographic variation of the species. From left: Near Grimstad (Aust Agder), 58°19’N, 08°36’E, 35 m, 3.65 mm (G 4-79); Hoholmsundet (Nordland), 66°04’N, 12°17’E, 40-35 m, 2.5 mm (N 3-84), and Fanafjorden NW of Korsneset, 60°13’N, 05°13.8’E, 100 m, 2.2 mm (ZMBN 83173). Figure 74.Ondina divisa, head-foot complex and pigmented mantle organ, and, lower right, operculum, from G.O. Sars 1878. (Not to scale).