Austropallene halanychi sp. nov., collection location (blue star) within the Ross Sea, Antarctica.

Austropallene halanychi sp. nov., male holotype A side view (scale) B dorsal view C front view, note cephalic spurs D dorsal view of opened chelifore claw; note absence of denticle and conical outgrowth at base of fixed and movable fingers E dorsal view of chelifore claw F ventral view of chelifore claw; note conical outgrowth G dorsal view of proboscis with setose wreath H setose wreath around proboscis I dorsal view of eyespot J third walking leg K first coxa of third walking leg L side view of second coxa of third walking leg M propodus of walking leg N tubercles and spines on walking legs O ovigerous leg of male P strigilis of ovigerous leg Q 10^th segment of oviger; note terminal spines R serrated ovigerous leg spines (compound spines) on strigilis of ovigerous leg.

Austropallene halanychi sp. nov., male holotype A dorsal view B dorsal-frontal view; note shape, relative size, and black tips of chela fingers, cephalic spurs, and eye tubercle and eyes; note sharp conical outgrowths at base of fixed and movable fingers of chelifores (red arrow) C eye tubercle, top view D dorsal view of cephalic spurs, chelifore claws, and proboscis; note setose wreath on proboscis E setose wreath of proboscis F dorsal view of chelifore claws; note lack of space between chelifore fingers and small outgrowth (red arrow) G dorsal view of tip of chelifore claw; note presence of bristles along top of immovable finger.

Austropallene halanychi sp. nov., male holotype A oviger, entire B strigilis, close-up view showing compound spines on segments 7–10 C compound spines on segment 9 D compound spines on segment 9 E strigilis, side view, showing compound spines on segments 7–10 (some spines on segment 10 are damaged or missing) F segments 8–10 with compound spines, and segment 10 with two terminal spines G segment 10, top view, close-up, with two terminal compound spines.

Phylogenetic tree constructed with protein-coding gene data. The phylogenetic tree shows placement of Austropallene halanychi sp. nov. and was constructed using protein-coding gene data with IQ-TREE2; it uses a maximum likelihood approach and best-fit model (GTR+F+R5). The clade containing A. halanychi sp. nov. is highlighted, and bootstrap support (based on 1000 rapid bootstrap replicates) is included.

Phylogenetic tree constructed with partial COI data from members of the family Callipallenidae. The phylogenetic tree was constructed with IQ-TREE2 using a maximum likelihood approach and the best-fit model (GTR+F+I+G4). The clade containing Austropallene halanychi sp. nov. is highlighted, and bootstrap support (based on 1000 rapid bootstrap replicates) is included.