Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections


Hydrozoa - Hydroida - Campanulariidae

Synonymy list
YearName and author
1993Mesodendriurn Waggoner and Langer

Is something missing? Join the Paleobiology Database and enter the data

phylumCnidariaHatschek 1888
classHydrozoaOwen 1843
orderHydroidaJohnston 1836
suborderCalyptoblastinaAllman 1871
familyCampanulariidaeJohnston 1836
subfamilyCampanulariinaeJohnston 1836

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

B. M. Waggoner and M. R. Langer 1993Probably chitinous perisarc preserved as dark orange-brown (presumably organic) impression. Anastomosing hydrorhizae form a holdfast. Growth pattern sympodial, possibly creeping; fascicled hydrocaulus 0,25-0,5 mm in diameter; individual stems and hydrorhizae 0,1-0,2 mm in diameter. Many branches behind the terminal hydrothecae terminate abruptly and lack hydrothecae; these arepresumed to have broken off or regressed. Pedicels relatively short; no apparent annulation. Hydrothecae deep, elongated, campanulate, 0,6-1,5 mm; no true diaphragm indicated, but thickening and constriction at base of hydrotheca. Crenulate ornamentation around hydrothecal rim, turning into ridges running down hydrothecal wall; 4-5 crenulations preserved per hydrotheca. No indentifiable gonangia preserved.