Cavinula davisiae Bahls, 2013

Bahls, Loren, 2013, New diatoms (Bacillariophyta) from western North America, Phytotaxa 82 (1), pp. 7-28 : 15-16

publication ID

https://doi.org/ 10.11646/phytotaxa.82.1.2

persistent identifier

https://treatment.plazi.org/id/03F2878E-FFCB-F86F-46F6-FF7E620CFCF0

treatment provided by

Felipe

scientific name

Cavinula davisiae Bahls
status

sp. nov.

Cavinula davisiae Bahls , sp. nov. ( Figs 43–51 View FIGURES 43–51 )

Valves elliptic-lanceolate with broadly rounded apices. Valve length 14–31 µm; valve width 7.5–9.9 µm. Axial area narrow and linear; central area orbicular and large, about 1/2 valve width. Raphe filiform and straight with distinctly expanded proximal ends. Terminal raphe fissures hooked abruptly in opposite directions some distance from each apex. Striae radiate throughout, alternately long and short around the central area, 26–32 in 10 µm. Areolae round, 26–35 in 10 µm. Areolae of striae adjacent to central area larger and somewhat elongate transapically. Internally, proximal raphe ends T-shaped and areolae occluded by hymenes.

Holotype: — USA, Washington: Pierce County, Mount Rainier National Park, Clover Lake , 46.9289 o N, 121.5925 o W, elev. 1750 m, coll. R. Davis, 18 August 2012. MDC sample 496201; holotype slide MDC 41-56 ( Figs 43–51 View FIGURES 43–51 ) (circled holotype specimen in Fig. 48 View FIGURES 43–51 ). MONTU! GoogleMaps

Isotypes: —MDC slide 126-50 ( MONTU!); circled specimens on ANSP! GC 65165.

Reported as: — Navicula variostriata ( Hein 1990: 76, pl. 31, figs 7–9); Navicula cf. variostriata ( Pienitz et al. 2003: 47, pl. 14, fig. 6).

Etymology:—This species is named after Ryan Davis, volunteer with Adventurers and Scientists for Conservation and collector of the holotype sample.

Observations:—Under SEM ( Fig. 50 View FIGURES 43–51 ), the terminal raphe ends are shown to be hooked in opposite directions well short of the apices. Internally ( Fig. 51 View FIGURES 43–51 ), with some additional magnification, the proximal raphe ends may be seen as T-shaped. Cavinula variostriata (Krasske) D.G. Mann in Round et al. (1990: 665) has more linear valves and an even larger central area. The central area of Navicula lapidosa Krasske (1929: 354) is shaped like a bow tie, not rounded.

Distribution and Ecology: — Cavinula davisiae appears to be endemic to the Pacific Northwest, where it is widespread and locally common in circumneutral waters with low conductivity. Previously, this species had been confused with Navicula variostriata Krasske (1923: 197) . Hein (1990) reported it from Adak Island, Alaska and Pienitz et al. (2003) reported it from islands off the Pacific Coast of western British Columbia.

Family Neidiaceae Mereschkowsky 1903: 127

Genus Neidium E. Pfitzer 1871: 39

R

Departamento de Geologia, Universidad de Chile

MONTU

University of Montana

ANSP

Academy of Natural Sciences of Philadelphia

GC

Goucher College

Kingdom

Chromista

Phylum

Bacillariophyta

Class

Bacillariophyceae

Order

Naviculales

Family

Cavinulaceae

Genus

Cavinula

Loc

Cavinula davisiae Bahls

Bahls, Loren 2013
2013
Loc

Neidiaceae

Mereschkowsky, C. 1903: 127
1903
Loc

Neidium E. Pfitzer 1871: 39

Pfitzer, E. 1871: 39
1871
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