Craticula sardiniana

Bahls 2013      Category: Symmetrical biraphid
BASIONYM: Craticula sardiniana Bahls 2013

REPORTED AS: Craticula "silviae" (Lange-Bertalot 2001) | Craticula (?) acidoclinata (Lange-Bertalot et al. 2003) 

Craticula pampeana

 

Ctenophora pulchella

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - June 2012
Length Range: 68-113 µm
Width Range: 15.6-19.5 µm
Striae in 10 µm: 14 (middle) to 18 (ends)

Description

Valves are lanceolate with broadly rounded apices. The axial area is linear and narrow. The central area is elliptic with convex sides, and about two times wider than the axial area. The raphe is weakly lateral, with straight and slightly inflated proximal ends. Striae are parallel in the middle, becoming weakly radiate and then convergent near the apices. Areolae may be resolved in LM and number 26 in 10 µm.



Original Description

Basionym: Craticula sardiniana
Author: Bahls 2013
Length Range: 68-113 µm
Width Range: 15.6-19.5 µm
Striae in 10 µm: 14 at valve center, 18 near the apices

Original Description

Valves lanceolate with broadly rounded, unprotracted apices. Valve length 68–113 μm; valve width 15.6–19.5 μm. Axial area linear and narrow. Central area elliptic with convex sides, about two times wider than axial area. Raphe weakly lateral with straight and slightly inflated proximal ends. Striae parallel in the middle, becoming weakly radiate, then convergent near the apices, 14 in 10 μm at the valve center to 18 in 10 μm near the apices. Areolae 26 in 10 μm. Craticula valves observed; “Heribaudii” valves not observed.

Original Images


Cite This Page:
Bahls, L. (2012). Craticula sardiniana. In Diatoms of the United States. Retrieved October 23, 2014, from http://westerndiatoms.colorado.edu/taxa/species/craticula_sardiniana

Species: Craticula sardiniana

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

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

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Lange-Bertalot, H., Cavacini, P., Tagliaventi, N. and Alfinito, S. (2003). Diatoms of Sardinia: Rare and 76 new species in rock pools and other ephemeral waters. Iconographia Diatomologica 12, 438 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Craticula sardiniana has been collected from two ponds in the northern Rocky Mountains where pH ranges from 7.8 to 11.1 and specific conductance ranges from 49 to 313 µS/cm. Its preference for alkaline waters with higher electrolyte content sets this taxon apart from Craticula acidoclinata, which prefers acidic or circumneutral waters with very low electrolyte content. Craticula sardiniana was first reported (as ? Craticula acidoclinata) from rock pools in Sardinia rich in electrolytes (Lange-Bertalot et al. 2003).

Images

Indian Springs Ponds, Waterton Lakes National Park, Alberta, Canada: home of Craticula sardiniana.

Credit/Source: Barb Johnston, Parks Canada

Skinner Pond No. 1, Beaverhead County, Montana: home of Craticula sardiniana.

Credit/Source: Loren Bahls