Acantorna, Lehnert & Stone, 2020

Lehnert, Helmut & Stone, Robert P., 2020, Acantorna-a new genus of Hymedesmiidae (Porifera, Demospongiae Poecilosclerida) from the western Aleutian Islands of Alaska with description of Acantorna tahoma n. sp., Zootaxa 4755 (1), pp. 155-162 : 157

publication ID

https://doi.org/ 10.11646/zootaxa.4755.1.7

publication LSID

lsid:zoobank.org:pub:FFDB122C-E34B-486A-AC99-88B240AAC4DD

DOI

https://doi.org/10.5281/zenodo.3728593

persistent identifier

https://treatment.plazi.org/id/0E138793-FF94-AF21-FF2D-F3A20C30A6E7

treatment provided by

Plazi

scientific name

Acantorna
status

gen. nov.

Genus Acantorna View in CoL n. gen.

Definition: Hymedesmiidae with subectosomal spicule tracts of acanthose tornotes, fanning out at the surface forming an ectosomal palisade. Choanosome a confusedly plumose arrangement of acanthostyles, acanthose tornotes, arcuate isochelae and thin sigmas. Areolate pore-fields are absent.

Diagnosis: Stalked, flabellate Hymedesmiidae with subectosomal spicule tracts fanning out at the surface forming an ectosomal palisade. Subectosomal tracts and ectosomal palisade consist of acantho-tornotes. The choanosome is a confusedly plumose arrangement of all spicule types: acanthostyles, acantho-tornotes and microscleres, sometimes vague plumose tracts of acanthostyles are recognizable near the ectosome. Microscleres are arcuate isochelae and thin sigmas.

Remarks: The ectosomal spicules are straight diactines, isodiametric, acanthose, with mucronate, sometimes unequal ends and thus conform to the definition of tornotes except for the fact that the tornotes of Acantorna are completely acanthose. Previously known tornotes are smooth or might have micro-spined ends. We suggest to name these acantho-tornotes acantornotes.

Type species: Acantorna tahoma View in CoL n. sp.

Etymology. The genus Acantorna is named after the unique acantornotes not known from other taxa of Poecilosclerida .

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF