Diatoms of North AmericaDiatoms of North America

Planothidium apiculatum

(R.M.Patrick) Lange-Bert. 1999

Planothidium Apiculatum Guide
  • Category
    Monoraphid
  • Length Range
    25-31 µm
  • Width Range
    9.0-12.7 µm
  • Striae in 10 µm
    10-12

Identification

Planothidium apiculatum LM3 Planothidium apiculatum LM1 Planothidium apiculatum LM4 Planothidium apiculatum LM6 Planothidium apiculatum LM2 Planothidium apiculatum LM5 Planothidium apiculatum LM7
View image metadata Type
Planothidium apiculatum SEM3 Planothidium apiculatum SEM1 Planothidium apiculatum SEM2 Planothidium apiculatum SEM4

Description

Valves are elliptic-lanceolate with apiculate apices. The raphe valve has a large rhomboid or transversely elliptic central area. The rapheless valve has an asymmetric central area, expanded on one side to the valve margin. This asymmetric central area also contains a cavum on the internal valve surface. The raphe is straight with expanded external proximal ends. The striae are strongly radiate on the raphe valve and slightly radiate on the rapheless valve. The striae are multiseriate.

Autecology

Original Description

Valvae elliptico-lanceolatae, 28 μ longae, 10-11 μ latae, apicibus apiculatis. Valva superior ad instar soleae equinae effigiem in medio ostendens, pseudoraphe anguste lanceolata; striis radiantibus, 10-12 in 10 μ. Valva inferior aream axialem angustam et aream centralem rotundatam exhibens; striis validis radiantibus, 10 in 10 μ.

  • Basionym
    Achnanthes lanceolata var. apiculata
  • Author
    R.M.Patrick 1945
  • Length Range
    28 µm
  • Width
    10-11 µm
  • Striae in 10µm
    10-12

Original Images

Orig Ill Plapic
Orig Descr Plapic

Cite This Page

Potapova, M. (2010). Planothidium apiculatum. In Diatoms of North America. Retrieved November 21, 2024, from https://diatoms.org/species/planothidium_apiculatum

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Planothidium apiculatum from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.