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Family THYSANOSTOMATIDAE Stiasny, 1940


Compiler and date details

June 2012 - Lisa-ann Gershwin

DRAFT RECORD

This taxon is under review. This record is released now for public view, prior to final verification. For further information or comment email us.



Introduction

The genus Thysanostoma was proposed by Agassiz (1862: 153) for the species to which he gave the name T. lessoni; this was a replacement name for Lesson's Melitea brachyura (1830: 227, pl. 80), based on the incompatability of a species with very long arms being named brachyura. Lesson's M. brachyura had originally been named as Rhizostoma brachyura Lesson (1829: 120).

Subsequently, Haeckel (1880: 625) added the species T. thysanura from Australia, and renamed Lesson's R. brachyura (= Agassiz's T. lessoni) as Thysanostoma melitea.

Mayer (1910: 691) made T. thysanura the type species, and speculated that R. brachyura might be the same species.

 

Diagnosis

Kolpophorae with annular subumbrellar muscles. With eight rhopalar radial canals. With ring canal. With a continuous genital porticus. Subgenital ostia very broad. Arm-disk quadratic, with four primary canals. With very elongate, narrow, lash-like mouth-arms, triangular or three-winged in cross-section, without clubs or filaments.

 

History of changes

Note that this list may be incomplete for dates prior to September 2013.
Published As part of group Action Date Action Type Compiler(s)
13-Aug-2013 MODIFIED