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This paper reports the discovery of a small population of sponges in the Pigeon River of eastern Tennessee, USA, which were morphologically distinct from   Spongillida   of North America. A morphological comparative analysis resulted in the first Nearctic record of the genus    Heterorotula    with the description of a new species    Heterorotula   lucasi    sp. nov.  diverging from all other known species by its unique combinations of diagnostic morphotraits of spicules and gemmules. The new record enlarges the geographic range of the genus which has been known until now only from Australia, New Zealand, New Caledonia, Japan (as an alien species), and from subequatorial Brazil (as subfossil remains). The discovery of a biogeographic enclave of    Heterorotula    in the southeastern United States contributes to the understanding of   Porifera   inland water biodiversity, biogeographic patterns, and adaptive morphotraits in the Nearctic and globally. Data confirm that the Appalachian region (Ordovician–Permian origin) of Tennessee and, in general, of North America have high levels of diversity and endemicity.

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﻿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

﻿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

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