diff --git a/R/Data_helps.R b/R/Data_helps.R
index c6ec9a4..daa9828 100644
--- a/R/Data_helps.R
+++ b/R/Data_helps.R
@@ -1,64 +1,73 @@
-#'@name IUCN
-#'@aliases IUCN
-#'@docType data
-#'@title IUCN avaliation for frogs of Phyllomedusa genus 
-#'@usage data(IUCN)
-#'@description Result of the function \code{\link{lets.iucn}} 
-#'applied to Southern American frog genera Phyllomedusa in 2014. 
+#' IUCN evaluation for frogs of the genus Phyllomedusa
+#' 
+#' Result of the (deprecated) function \code{\link{lets.iucn}} 
+#' applied to South American frog genus Phyllomedusa in 2014.
+#'
+#'@format A data frame with 32 rows and 7 columns:
+#'\describe{
+#'  \item{Species}{Scientific name}
+#'  \item{Family}{Family}
+#'  \item{Status}{Red List Status}
+#'  \item{Criteria}{Criteria for listing as threatened}
+#'  \item{Population}{Population trend per IUCN}
+#'  \item{Description_Year}{Year described}
+#'  \item{Country}{Presence in country}
+#'}
+#'
+#'@source IUCN - \url{https://www.iucnredlist.org/}. 2014.  
+"IUCN" 
 
-NULL
 
-#'@name PAM
-#'@aliases PAM
-#'@docType data
-#'@title PresenceAbsence object for frogs of Phyllomedusa genus
-#'@usage data(PAM)
-#'@description PresenceAbsence object obtained using the function \code{\link{lets.presab}} 
-#'in the Geographic distribution of the Southern American frog genus \link{Phyllomedusa}.
-#'@source IUCN - \url{https://www.iucnredlist.org/}. 2014.
+#' PresenceAbsence object for frogs of the genus Phyllomedusa
+#' 
+#' PresenceAbsence object obtained using the function \code{\link{lets.presab}} 
+#' for the Geographic distribution of the South American frog genus \link{Phyllomedusa}.
+#' @format A PresenceAbsence object
+#' @source Generated from IUCN Spatial Data - \url{https://www.iucnredlist.org/}. 2014.
+"PAM"
 
-NULL
+#' Phyllomedusa
+#' 
+#' Geographic distribution of the South American frog genus Phyllomedusa. 
+# 'Data modified from the IUCN Red List spatial dataset, downloaded 05/2014).
+#'
+#' See the IUCN Red List Attribute Information for Species Ranges. 
+#'
+#' @format A simple feature collection for 32 species with 46 features and 4 fields.
+#' 
+#' \describe{
+#'  \item{binomial}{Scientific name}
+#'  \item{presence}{IUCN Red List distributional code}
+#'  \item{origin}{IUCN Red List distributional code}
+#'  \item{seasonal}{IUCN Red List distributional code}
+#' }
+#' @source IUCN - \url{https://www.iucnredlist.org/}. 2014.
+"Phyllomedusa"
 
-#'@name Phyllomedusa
-#'@aliases Phyllomedusa
-#'@docType data
-#'@title Geographic distribution of Phyllomedusa genus
-#'@usage data(Phyllomedusa)
-#'@description Geographic distribution of the Southern American frog genera Phyllomedusa. 
-#'Data was modfied from IUCN (\url{https://www.iucnredlist.org/}, downloaded in 05/2014). 
-#'There are 32 species and 46 polygons.
-#'@source IUCN - \url{https://www.iucnredlist.org/}. 2014.
 
-NULL
+#' Mean temperature raster for the world.
+#'
+#' Mean temperature raster in degrees Celsius (multiplied by 100) 
+#' for the world in 10 arc min of resolution. 
+#' @format A PackedStatRaster object.
+#' @source Data was modified from WorldClim (\url{https://worldclim.com/}, downloaded 05/2014).
+#' 
+#' Hijmans, R.J., S.E. Cameron, J.L. Parra, P.G. Jones and A. Jarvis, 2005. 
+#' Very high resolution interpolated climate surfaces for global land areas. 
+#' International Journal of Climatology 25: 1965-1978.
+"temp"
 
-#'@name temp
-#'@aliases temp
-#'@docType data
-#'@title Avarege temperature raster for the world.
-#'@usage data(temp)
-#'@description Average temperature raster in Celsius degrees(multiplied by 100) 
-#'for the world in 10 arc min of resolution. Data was modfied from 
-#'WorldClim (\url{https://worldclim.com/}, downloaded in 05/2014).
-#'@source Hijmans, R.J., S.E. Cameron, J.L. Parra, P.G. Jones and A. Jarvis, 2005. 
-#'Very high resolution interpolated climate surfaces for global land areas. 
-#'International Journal of Climatology 25: 1965-1978.
 
-NULL
-
-
-
-#'@name wrld_simpl
-#'@aliases wrld_simpl
-#'@docType data
-#'@title Simplified world country polygons
-#'@usage data(temp)
-#'@description Shapefile in sf format. The object was obtained from maptools
-#'  package and converted to sf.
-#'@source Originally
-#'  “https://mappinghacks.com/data/TM_WORLD_BORDERS_SIMPL-0.2.zip”, 
+#' Simplified world country polygons
+#' 
+#' World map in sf format. Obtained from maptools 
+#' and converted to sf.
+#'  
+#' @format A simple feature collection with 246 features and 11 fields.
+#' @source Originally
+#'  \url{https://mappinghacks.com/data/TM_WORLD_BORDERS_SIMPL-0.2.zip}, 
 #'  now available from
-#'  https://github.com/nasa/World-Wind-Java/tree/master/WorldWind/testData/shapefiles
-
+#'  \url{https://github.com/nasa/World-Wind-Java/tree/master/WorldWind/testData/shapefiles}.
+"wrld_simpl"
 
 
-NULL
diff --git a/R/lets_presab.R b/R/lets_presab.R
index e0dce93..5fcdd31 100644
--- a/R/lets_presab.R
+++ b/R/lets_presab.R
@@ -8,17 +8,17 @@
 #'@param shapes Object of class \code{SpatVect} or \code{Spatial} (see packages
 #'  \code{\link{terra}} and  \code{\link{sf}} to read these files) containing
 #'  the distribution of one or more species. Species names should be stored in
-#'  the object as BINOMIAL/binomial or SCINAME/sciname.
-#'@param xmx Maximun longitude used to construct the grid in which the matrix
+#'  the object as BINOMIAL/binomial or SCINAME/sciname. 
+#'@param xmx Maximum longitude used to construct the grid in which the matrix
 #'  will be based (i.e. the [gridded] geographic domain of interest). 
 #'  If NULL, limits will be calculated based on the limits of the shapes object.
-#'@param xmn Minimun longitude used to construct the grid in which the matrix
+#'@param xmn Minimum longitude used to construct the grid in which the matrix
 #'  will be based (i.e. the [gridded] geographic domain of interest).
 #'  If NULL, limits will be calculated based on the limits of the shapes object.
-#'@param ymx Maximun latitude used to construct the grid in which the matrix
+#'@param ymx Maximum latitude used to construct the grid in which the matrix
 #'  will be based (i.e. the [gridded] geographic domain of interest).
 #'  If NULL, limits will be calculated based on the limits of the shapes object.
-#'@param ymn Minimun latitude used to construct the grid in which the matrix
+#'@param ymn Minimum latitude used to construct the grid in which the matrix
 #'  will be based (i.e. the [gridded] geographic domain of interest).
 #'  If NULL, limits will be calculated based on the limits of the shapes object.
 #'@param resol Numeric vector of length 1 or 2 to set the grid resolution. 
@@ -59,13 +59,13 @@
 #' *But see the optional argument \code{show.matrix}.
 #'
 #'
-#'@details The function creates the presence-absence matrix based on a raster
+#'@details This function creates the presence-absence matrix based on a raster
 #'  object. Depending on the cell size, extension used and number of species it
 #'  may require a lot of memory, and may take some time to process it. Thus,
 #'  during the process, if \code{count} argument is set \code{TRUE}, a counting
-#'  window will open so you can see the progress (i.e. in what polygon/shapefile
-#'  the function is working). Note that the number of polygons is not the same
-#'  as the number of species that you have (i.e. a species may have more than
+#'  window will open to display the progress (i.e. the polygon/shapefile
+#'  that the function is working on). Note that the number of polygons is not the same
+#'  as the number of species (i.e. a species may have more than
 #'  one polygon/shapefiles).
 #'
 #'@seealso \code{\link{plot.PresenceAbsence}}
@@ -73,7 +73,7 @@
 #'@seealso \code{\link{lets.shFilter}}
 #'
 #' @examples \dontrun{
-#' # Spatial distribution polygons of south american frogs
+#' # Spatial distribution polygons of South American frogs
 #' # of genus Phyllomedusa.
 #' data(Phyllomedusa)
 #' PAM <- lets.presab(Phyllomedusa)
@@ -81,7 +81,7 @@
 #' # Species richness map
 #' plot(PAM, xlab = "Longitude", ylab = "Latitude",
 #'      main = "Phyllomedusa species richness")
-#' # Map of the specific species
+#' # Map of individual species
 #' plot(PAM, name = "Phyllomedusa nordestina")
 #'}
 #'
@@ -108,7 +108,14 @@ lets.presab <- function(shapes,
                         seasonal = NULL,
                         count = FALSE) {
   
-    
+  # look for species names
+  if(!any(c("binomial","BINOMIAL","SCINAME","sciname") %in% names(shapes)))
+  {
+    stop(paste0("species names missing from shapes ",
+                "or column name in data does not match required names"))
+  }
+  
+  
   shapes <- .check_shape(shapes)
   
   # Projection set for spatial polygons
@@ -234,7 +241,7 @@ lets.presab <- function(shapes,
 
 
 
-# Axuliar function to avoid code repetition inside the loop <<<<<<<<<
+# Helper function to avoid code repetition inside the loop <<<<<<<<<
 
 # Function to extract cell positions in the raster
 .extractpos <- function(ras,
diff --git a/man/IUCN.Rd b/man/IUCN.Rd
new file mode 100644
index 0000000..e9dafc8
--- /dev/null
+++ b/man/IUCN.Rd
@@ -0,0 +1,29 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/Data_helps.R
+\docType{data}
+\name{IUCN}
+\alias{IUCN}
+\title{IUCN evaluation for frogs of the genus Phyllomedusa}
+\format{
+A data frame with 32 rows and 7 columns:
+\describe{
+ \item{Species}{Scientific name}
+ \item{Family}{Family}
+ \item{Status}{Red List Status}
+ \item{Criteria}{Criteria for listing as threatened}
+ \item{Population}{Population trend per IUCN}
+ \item{Description_Year}{Year described}
+ \item{Country}{Presence in country}
+}
+}
+\source{
+IUCN - \url{https://www.iucnredlist.org/}. 2014.
+}
+\usage{
+IUCN
+}
+\description{
+Result of the (deprecated) function \code{\link{lets.iucn}} 
+applied to South American frog genus Phyllomedusa in 2014.
+}
+\keyword{datasets}
diff --git a/man/PAM.Rd b/man/PAM.Rd
index e8f1f85..739312b 100644
--- a/man/PAM.Rd
+++ b/man/PAM.Rd
@@ -3,14 +3,18 @@
 \docType{data}
 \name{PAM}
 \alias{PAM}
-\title{PresenceAbsence object for frogs of Phyllomedusa genus}
+\title{PresenceAbsence object for frogs of the genus Phyllomedusa}
+\format{
+A PresenceAbsence object
+}
 \source{
-IUCN - \url{https://www.iucnredlist.org/}. 2014.
+Generated from IUCN Spatial Data - \url{https://www.iucnredlist.org/}. 2014.
 }
 \usage{
-data(PAM)
+PAM
 }
 \description{
 PresenceAbsence object obtained using the function \code{\link{lets.presab}} 
-in the Geographic distribution of the Southern American frog genus \link{Phyllomedusa}.
+for the Geographic distribution of the South American frog genus \link{Phyllomedusa}.
 }
+\keyword{datasets}
diff --git a/man/Phyllomedusa.Rd b/man/Phyllomedusa.Rd
index e867553..580c1f4 100644
--- a/man/Phyllomedusa.Rd
+++ b/man/Phyllomedusa.Rd
@@ -3,15 +3,27 @@
 \docType{data}
 \name{Phyllomedusa}
 \alias{Phyllomedusa}
-\title{Geographic distribution of Phyllomedusa genus}
+\title{Phyllomedusa}
+\format{
+A simple feature collection for 32 species with 46 features and 4 fields.
+
+\describe{
+ \item{binomial}{Scientific name}
+ \item{presence}{IUCN Red List distributional code}
+ \item{origin}{IUCN Red List distributional code}
+ \item{seasonal}{IUCN Red List distributional code}
+}
+}
 \source{
 IUCN - \url{https://www.iucnredlist.org/}. 2014.
 }
 \usage{
-data(Phyllomedusa)
+Phyllomedusa
 }
 \description{
-Geographic distribution of the Southern American frog genera Phyllomedusa. 
-Data was modfied from IUCN (\url{https://www.iucnredlist.org/}, downloaded in 05/2014). 
-There are 32 species and 46 polygons.
+Geographic distribution of the South American frog genus Phyllomedusa.
+}
+\details{
+See the IUCN Red List Attribute Information for Species Ranges.
 }
+\keyword{datasets}
diff --git a/man/iucn.Rd b/man/iucn.Rd
deleted file mode 100644
index 57c1e9a..0000000
--- a/man/iucn.Rd
+++ /dev/null
@@ -1,13 +0,0 @@
-% Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/Data_helps.R
-\docType{data}
-\name{IUCN}
-\alias{IUCN}
-\title{IUCN avaliation for frogs of Phyllomedusa genus}
-\usage{
-data(IUCN)
-}
-\description{
-Result of the function \code{\link{lets.iucn}} 
-applied to Southern American frog genera Phyllomedusa in 2014.
-}
diff --git a/man/lets.PAMcrop.Rd b/man/lets.pamcrop.Rd
similarity index 100%
rename from man/lets.PAMcrop.Rd
rename to man/lets.pamcrop.Rd
diff --git a/man/lets.presab.Rd b/man/lets.presab.Rd
index 31ad155..3ee40d1 100644
--- a/man/lets.presab.Rd
+++ b/man/lets.presab.Rd
@@ -29,19 +29,19 @@ lets.presab(
 the distribution of one or more species. Species names should be stored in
 the object as BINOMIAL/binomial or SCINAME/sciname.}
 
-\item{xmn}{Minimun longitude used to construct the grid in which the matrix
+\item{xmn}{Minimum longitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{xmx}{Maximun longitude used to construct the grid in which the matrix
+\item{xmx}{Maximum longitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest). 
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{ymn}{Minimun latitude used to construct the grid in which the matrix
+\item{ymn}{Minimum latitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{ymx}{Maximun latitude used to construct the grid in which the matrix
+\item{ymx}{Maximum latitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
@@ -97,18 +97,18 @@ Convert species' ranges (in shapefile format) into a
  presence-absence matrix based on a user-defined grid system
 }
 \details{
-The function creates the presence-absence matrix based on a raster
+This function creates the presence-absence matrix based on a raster
  object. Depending on the cell size, extension used and number of species it
  may require a lot of memory, and may take some time to process it. Thus,
  during the process, if \code{count} argument is set \code{TRUE}, a counting
- window will open so you can see the progress (i.e. in what polygon/shapefile
- the function is working). Note that the number of polygons is not the same
- as the number of species that you have (i.e. a species may have more than
+ window will open to display the progress (i.e. the polygon/shapefile
+ that the function is working on). Note that the number of polygons is not the same
+ as the number of species (i.e. a species may have more than
  one polygon/shapefiles).
 }
 \examples{
 \dontrun{
-# Spatial distribution polygons of south american frogs
+# Spatial distribution polygons of South American frogs
 # of genus Phyllomedusa.
 data(Phyllomedusa)
 PAM <- lets.presab(Phyllomedusa)
@@ -116,7 +116,7 @@ summary(PAM)
 # Species richness map
 plot(PAM, xlab = "Longitude", ylab = "Latitude",
      main = "Phyllomedusa species richness")
-# Map of the specific species
+# Map of individual species
 plot(PAM, name = "Phyllomedusa nordestina")
 }
 
diff --git a/man/lets.presab.birds.Rd b/man/lets.presab.birds.Rd
index 1421cbd..d1f2412 100644
--- a/man/lets.presab.birds.Rd
+++ b/man/lets.presab.birds.Rd
@@ -29,19 +29,19 @@ lets.presab.birds(
 shapefiles. Shapefiles with more than one species will not work on this
 function. To use multi-species shapefiles see \code{\link{lets.presab}}.}
 
-\item{xmn}{Minimun longitude used to construct the grid in which the matrix
+\item{xmn}{Minimum longitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{xmx}{Maximun longitude used to construct the grid in which the matrix
+\item{xmx}{Maximum longitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest). 
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{ymn}{Minimun latitude used to construct the grid in which the matrix
+\item{ymn}{Minimum latitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{ymx}{Maximun latitude used to construct the grid in which the matrix
+\item{ymx}{Maximum latitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
diff --git a/man/lets.presab.points.Rd b/man/lets.presab.points.Rd
index 20b4f74..c35ffec 100644
--- a/man/lets.presab.points.Rd
+++ b/man/lets.presab.points.Rd
@@ -26,19 +26,19 @@ column is the longitude (or x), and the second latitude (or y).}
 \item{species}{Character vector with species names, in the same order as the
 coordinates.}
 
-\item{xmn}{Minimun longitude used to construct the grid in which the matrix
+\item{xmn}{Minimum longitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{xmx}{Maximun longitude used to construct the grid in which the matrix
+\item{xmx}{Maximum longitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest). 
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{ymn}{Minimun latitude used to construct the grid in which the matrix
+\item{ymn}{Minimum latitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
-\item{ymx}{Maximun latitude used to construct the grid in which the matrix
+\item{ymx}{Maximum latitude used to construct the grid in which the matrix
 will be based (i.e. the [gridded] geographic domain of interest).
 If NULL, limits will be calculated based on the limits of the shapes object.}
 
diff --git a/man/temp.Rd b/man/temp.Rd
index 0e5ab21..a8c0c10 100644
--- a/man/temp.Rd
+++ b/man/temp.Rd
@@ -3,17 +3,22 @@
 \docType{data}
 \name{temp}
 \alias{temp}
-\title{Avarege temperature raster for the world.}
+\title{Mean temperature raster for the world.}
+\format{
+A PackedStatRaster object.
+}
 \source{
+Data was modified from WorldClim (\url{https://worldclim.com/}, downloaded 05/2014).
+
 Hijmans, R.J., S.E. Cameron, J.L. Parra, P.G. Jones and A. Jarvis, 2005. 
 Very high resolution interpolated climate surfaces for global land areas. 
 International Journal of Climatology 25: 1965-1978.
 }
 \usage{
-data(temp)
+temp
 }
 \description{
-Average temperature raster in Celsius degrees(multiplied by 100) 
-for the world in 10 arc min of resolution. Data was modfied from 
-WorldClim (\url{https://worldclim.com/}, downloaded in 05/2014).
+Mean temperature raster in degrees Celsius (multiplied by 100) 
+for the world in 10 arc min of resolution.
 }
+\keyword{datasets}
diff --git a/man/wrld_simpl.Rd b/man/wrld_simpl.Rd
index 5b1d24f..1b73613 100644
--- a/man/wrld_simpl.Rd
+++ b/man/wrld_simpl.Rd
@@ -4,16 +4,20 @@
 \name{wrld_simpl}
 \alias{wrld_simpl}
 \title{Simplified world country polygons}
+\format{
+A simple feature collection with 246 features and 11 fields.
+}
 \source{
 Originally
- “https://mappinghacks.com/data/TM_WORLD_BORDERS_SIMPL-0.2.zip”, 
+ \url{https://mappinghacks.com/data/TM_WORLD_BORDERS_SIMPL-0.2.zip}, 
  now available from
- https://github.com/nasa/World-Wind-Java/tree/master/WorldWind/testData/shapefiles
+ \url{https://github.com/nasa/World-Wind-Java/tree/master/WorldWind/testData/shapefiles}.
 }
 \usage{
-data(temp)
+wrld_simpl
 }
 \description{
-Shapefile in sf format. The object was obtained from maptools
- package and converted to sf.
+World map in sf format. Obtained from maptools 
+and converted to sf.
 }
+\keyword{datasets}
diff --git a/tests/testthat/test-lets_presab.R b/tests/testthat/test-lets_presab.R
index 4fb50d9..e5e6b53 100644
--- a/tests/testthat/test-lets_presab.R
+++ b/tests/testthat/test-lets_presab.R
@@ -168,3 +168,13 @@ test_that("lets.presab new projection grid", {
   expect_equal(class(PAM2[[3]]), "character")  
   
 })
+
+test_that("lets.presab stops when species names column is missing", {
+  
+  Phyllo2 <- Phyllomedusa
+  names(Phyllo2)[1] <- "species_name"
+  expect_error(
+  lets.presab(Phyllo2)
+  )
+
+})