A new species of Echinoderes (Kinorhyncha: Cyclorhagida: Echinoderidae) from the Argentinean continental shelf with notes on its postembryonic development and on subcuticular morphological characters unreported for Kinorhyncha

Author:

RUCCI KEVIN A.ORCID,NEUHAUS BIRGERORCID,BULNES VERÓNICA N.ORCID

Abstract

Echinoderes goku sp. nov. is described from adult and juvenile specimens in samples collected from the Argentinean continental shelf in March 2019 during the campaign of the Motorsailer “Bernardo Houssay”, based on light and scanning electron microscopy studies. Echinoderes goku sp. nov. is differentiated from other species by its unique spine and tube pattern: (1) middorsal spine on segments 4, 6, and 8, (2) spine in lateroventral position on segments 6–9, (3) tube present in subdorsal position on segment 2, sublateral to midlateral position on segments 7 and 9, lateral accessory position on segment 8, lateroventral position on segment 5 and ventrolateral position on segment 2. Additionally, this species (4) lacks type-2 gland cell outlets and female-specific papillae or subcuticular funnel-like structures. (5) The male possesses a sublateral tube on segment 10 with a basal cylindrical reinforcement structure and three penile spines on segment 11, whereas the female lacks penile spines but reveals a lateral terminal accessory spine on segment 11 and on segment 10 lacks a subdorsal tube but possesses instead a sublateral fringe on the surface connected with a subcuticular conical structure and a basal cylindrical reinforcement structure. Among several juvenile specimens, one was captured in the process of moulting from the last juvenile stage to the female. Whereas the last juvenile stage revealed a sublateral tube on segment 10, the moulting female lacked this tube and showed a conical subcuticular structure with a basal cylindrical reinforcement structure instead. A cylindrical reinforcement structure at the base of a tube and a subcuticular conical structure have not been reported before for Kinorhyncha, and 14 selected species of Echinoderidae available for study were screened for these characters in order to get a first idea of their possible taxonomic importance. This article reports about the second species of Echinoderes from Argentinean waters.  

Publisher

Magnolia Press

Subject

Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

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