diff --git a/pawsey_shortread/megahit_map_reads.slurm b/pawsey_shortread/megahit_map_reads.slurm
new file mode 100644
index 0000000..0f34bf8
--- /dev/null
+++ b/pawsey_shortread/megahit_map_reads.slurm
@@ -0,0 +1,102 @@
+#!/bin/bash
+#SBATCH --job-name=MegaHitMap
+#SBATCH --time=0-8
+#SBATCH --ntasks=1
+#SBATCH --cpus-per-task=16
+#SBATCH --mem=32G
+#SBATCH -o slurm_output/megahit_slurm/megahit-map-%A_%a.out
+#SBATCH -e slurm_output/megahit_slurm/megahit-map-%A_%a.err
+
+set -euo pipefail
+trap 's=$?; echo "$0: Error on line $LINENO: $BASH_COMMAND" >&2; exit $s' ERR
+
+# Test we have atavide_lite conda installed, and then activate it.
+eval "$(conda shell.bash hook)"
+"$HOME/GitHubs/atavide_lite/pawsey_lib/check_atavide_lite_env.sh"
+ATAVIDE_CONDA="/scratch/$PAWSEY_PROJECT/$USER/software/miniconda3/atavide_lite"
+conda activate "$ATAVIDE_CONDA"
+
+if [[ ! -f R1_reads.txt ]]; then
+	echo "Please make a file with the R1 reads using this command:" >&2
+	echo 'find fastq -name \*R1\* -printf "%f\n" > R1_reads.txt' >&2
+	exit 2
+fi
+
+if [[ ! -f DEFINITIONS.sh ]]; then
+	echo "Please create a DEFINITIONS.sh file with FILEEND and HOSTREMOVED" >&2
+	exit 2
+fi
+
+source DEFINITIONS.sh
+: "${FILEEND:?FILEEND must be defined in DEFINITIONS.sh}"
+: "${HOSTREMOVED:?HOSTREMOVED must be defined in DEFINITIONS.sh}"
+: "${SLURM_ARRAY_TASK_ID:?Submit this script as a SLURM array job}"
+: "${SLURM_CPUS_PER_TASK:?SLURM_CPUS_PER_TASK is not set}"
+if (( SLURM_CPUS_PER_TASK < 5 )); then
+	echo "This job requires at least 5 CPUs, but SLURM_CPUS_PER_TASK=$SLURM_CPUS_PER_TASK" >&2
+	exit 2
+fi
+
+# The mapper, view, and sort stages run concurrently. Account for each
+# samtools process's main thread as well as its additional -@ threads.
+MAP_THREADS=$((SLURM_CPUS_PER_TASK - 4))
+VIEW_THREADS=1
+SORT_THREADS=1
+INDEX_THREADS=$((SLURM_CPUS_PER_TASK - 1))
+
+R1=$(sed -n "${SLURM_ARRAY_TASK_ID}p" R1_reads.txt)
+if [[ -z "$R1" ]]; then
+	echo "No sample was found on line $SLURM_ARRAY_TASK_ID of R1_reads.txt" >&2
+	exit 2
+fi
+R2=${R1/_R1/_R2}
+SAMPLE=${R1%"$FILEEND"}
+if [[ "$SAMPLE" == "$R1" ]]; then
+	echo "ERROR: $R1 does not end with FILEEND ($FILEEND)" >&2
+	exit 2
+fi
+
+ASSEMBLY_DIR="megahit/$SAMPLE"
+REFERENCE="$ASSEMBLY_DIR/final.contigs.fa"
+BAM="$ASSEMBLY_DIR/mapped_reads.bam"
+TMP_BAM="$ASSEMBLY_DIR/.mapped_reads.${SLURM_JOB_ID:-$$}.bam"
+TMP_PREFIX="${TMPDIR:-/tmp}/megahit-map-${SLURM_JOB_ID:-$$}-${SLURM_ARRAY_TASK_ID}"
+
+for INPUT in "$HOSTREMOVED/$R1" "$HOSTREMOVED/$R2" "$REFERENCE"; do
+	if [[ ! -s "$INPUT" ]]; then
+		echo "Missing or empty input: $INPUT" >&2
+		exit 2
+	fi
+done
+
+if [[ -s "$BAM" && -s "$BAM.bai" ]] \
+	&& samtools quickcheck "$BAM" \
+	&& samtools idxstats "$BAM" >/dev/null; then
+	echo "$BAM and its index already exist and passed validation. Nothing to do." >&2
+	exit 0
+fi
+if [[ -e "$BAM" || -e "$BAM.bai" ]]; then
+	echo "Incomplete output exists at $BAM or $BAM.bai; refusing to overwrite it" >&2
+	exit 2
+fi
+
+cleanup() {
+	status=$?
+	rm -f -- "$TMP_BAM" "$TMP_BAM.bai"
+	exit "$status"
+}
+trap cleanup EXIT
+
+echo "Mapping $HOSTREMOVED/$R1 and $HOSTREMOVED/$R2 to $REFERENCE" >&2
+minimap2 -t "$MAP_THREADS" --secondary=no -ax sr \
+	--split-prefix "$TMP_PREFIX" "$REFERENCE" "$HOSTREMOVED/$R1" "$HOSTREMOVED/$R2" \
+	| samtools view -@ "$VIEW_THREADS" -b -F 4 - \
+	| samtools sort -@ "$SORT_THREADS" -T "${TMP_PREFIX}.sort" -o "$TMP_BAM" -
+
+samtools index -@ "$INDEX_THREADS" "$TMP_BAM"
+samtools quickcheck "$TMP_BAM"
+samtools idxstats "$TMP_BAM" >/dev/null
+mv -- "$TMP_BAM" "$BAM"
+mv -- "$TMP_BAM.bai" "$BAM.bai"
+
+echo "Created $BAM and $BAM.bai" >&2