Sigmurethra is a taxonomic category of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs.
 This is an informal group which includes the majority of land snails and slugs.
Helleborine is the common name for a number of species of orchid.
 It does not correspond to any currently used taxonomic category.
 Some of the plants called helleborines are classified in the genus "Epipactis", some in genus "Cephalanthera".
 A genus "Helleborine" was formerly recognised but has now been absorbed into the Grass pink genus "Calapogon".
Heterostropha was a previously used taxonomic category, an order of sea snails, within the superorder Heterobranchia.
 In the most current gastropod taxonomy, that of Bouchet & Rocroi, this taxon is no longer in use.
Aptera is an obsolete taxonomic category, which included the Apterygota along with various other wingless arthropods.
Gammaridae is a family of amphipods.
 In North America they are included among the folk taxonomic category of "scuds", and otherwise gammarids is usually used as a common name.
Holcus (soft-grass or velvetgrass) is a genus of African and Eurasian plants in the oat tribe within the grass family.
Eogastropoda was a previously used taxonomic category of snails or gastropods, a subclass which was erected by Ponder and Lindberg in 1997.
 It was one of two great divisions (subclasses) of the class Gastropoda, the snails.
 The other subclass of gastropods was the Orthogastropoda.
Limonium is a genus of 120 flowering plant species.
 Members are also known as sea-lavender, statice, caspia or marsh-rosemary.
 Despite their common names, species are not related to the lavenders or to rosemary.
 They are instead in Plumbaginaceae, the plumbago or leadwort family.
Cladorhiza segonzaci is a species of sponge in the taxonomic category of Demospongiae.
 The body of the sponge consists of a spicule and fibers and is water absorbent.
Cladorhiza inversa is a species of sponge in the taxonomic category of Demospongiae.
 The body of the sponge consists of a spicule and fibers and is water absorbent.

Question: Do both Holcus and Limonium belong to the same taxonomic category?
Answer: yes