Heterorotula lucasi sp. nov. from the Pigeon River, Tennessee (type locality). Micrographs of skeletal megascleres by SEM A acanthoxeas fusiform from nearly spineless to variably spined excepts towards the tips B detail of an oxea smooth only at the tip C spiny shaft of an acanthoxea; scattered spines and microspines on shaft. Scale bars: 100 μm (A); 20 μm (B); 10 μm (C).

 
 
  Part of: Manconi R, Copeland J, Kunigelis S, Pronzato R (2022) Biodiversity of Nearctic inland water: discovery of the genus Heterorotula (Porifera, Spongillida, Spongillidae) in the Appalachian Mountains, with biogeographical implications and description of new species. ZooKeys 1110: 103-120. https://doi.org/10.3897/zookeys.1110.79615