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Hillerella

Sous-embranchement (subphylum) des Rhynchonelliformea
Classe des Rhynchonellata
Ordre des Terebratulida
Sous-Ordre des Terebratellidina
Super-famille des Kraussinoidea

 
 
 
 
 


Genus Hillerella Simon, Logan & Mottequin, 2016
[Type species= Hillerella bisepta Simon, Logan & Mottequin, 2016 (p. 25)]

Micromorphic kraussinoid, wider than long, biconvex, tuberculate radial costae mainly on ventral valve; dorsal valve with less prominent costae; ventral valve interior with single central septum, dorsal valve without cardinal process or crura; floor of dorsal valve interior with two prominent subparallel septa directed posteriorly from loop towards the hinge line; loop consisting of an arch supported by two slightly divergent plates attached to valve floor.

Present

Diagnosis from Simon et al., 2016

Extant Species of Hillerella
  • M. bisepta Simon, Logan et Mottequin, 2016
    		•  Diagnosis


    Hillerella bisepta  Simon, Logan et Mottequin, 2016

    Type locality: Station 100/8 at 90m depth off Port Sudan, Red Sea (18° 57.5’N, 38°15.8’E)
    Depth range: 90 m

    Megerlia echinata (Fischer & Œhlert, 1890)

    Diagnosis - (Simon, Logan et Mottequin, in Simon et al., 2016)

    Micromorphic kraussinoid, wider than long, biconvex, ventral valve with tuberculate radial costae; dorsal valve with less prominent radial ornamentation; ventral valve interior with single central septum not interrupted in its posterior part, hinge line with prominent teeth; dorsal valve hinge line with sockets but without cardinal process or crura; dorsal valve floor with usually a single commissural row of tubercles, dorsal valve interior with two prominent subparallel septa directed posteriorly from loop and slightly converging towards the hinge line, loop consisting of an arch supported by two slightly outwardly-inclined plates attached to valve floor, with a thin ventral bridge and with ventro-anterior expansions not strongly developed.