A New Species of Waginella (Crustacea: Thecostraca: Ascothoracida) Parasitic on a Stalked Crinoid From Tasman Sea, With Notes on Morphology of Related Genera

A new ectoparasitic ascothoracidan species has been discovered off northern Tasman Sea at a depth of 520 m. Single female, described herein as Waginella ebonita Kolbasov and Newman sp. nov. in the family Synagogidae Gruvel, 1905 , was collected on the column of crinoid Metacrinus sp. This is the fir...

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Bibliographic Details
Published in:Frontiers in Marine Science 2021-06, Vol.8
Main Authors: Kolbasov, Gregory A., Savchenko, Alexandra S., Newman, William A., Chan, Benny K. K.
Format: Article
Language:English
Subjects:
Abdomen
Aquatic crustaceans
Ascothoracida
Body organs
Congeners
Ectoparasites
Electron microscopy
Females
Genera
lattice organs
Males
Marine invertebrates
Morphology
New species
Parasites
parasitic crustaceans
Penis
Scanning electron microscopy
SEM
taxonomy
Thecostraca
ultrastructure
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Summary:A new ectoparasitic ascothoracidan species has been discovered off northern Tasman Sea at a depth of 520 m. Single female, described herein as Waginella ebonita Kolbasov and Newman sp. nov. in the family Synagogidae Gruvel, 1905 , was collected on the column of crinoid Metacrinus sp. This is the first study of a new form of Waginella to be based on the extensive use of both light and scanning electron microscopy to document the fine-scale external morphology. We studied the external morphology of other two species of Waginella , W . cf. axotremata and W. sandersi utilizing SEM and compared fine structures of all congeners. The genus Waginella represents a monophyletic taxon including at least 4 species having similar and unique morphology even on the ultrastructural level. Two species, W . cf. axotremata and W . cf. metacrinicola may represent at least two complexes of species. The morphology of an attachment apparatus in all species of Waginella suggests that they remain attached to the host for a considerable period of time. The lattice organs of Waginella have a unique structure distinguishing from all Thecostraca. Waginella ebonita sp. nov. is the second species of this genus known to harbor hyperparasitic cryptoniscid isopods representing parasitic castrators.
ISSN:2296-7745
2296-7745
DOI:10.3389/fmars.2021.616001