▁the ▁National ▁Museum ▁of ▁Natural ▁History , ▁Smith son ian ▁Institution . ▁ ▁Description ▁The ▁body ▁is ▁o val . ▁Mant le ▁is ▁rig id . ▁D ors um ▁is ▁covered ▁with ▁small ▁c ary oph yll idia . ▁Body , ▁r hin op hor es , ▁and ▁g ill ▁are ▁dark ▁pur pl ish ▁brown ▁with ▁numerous ▁small ▁op aque ▁white ▁d ots . ▁It ▁is ▁up ▁to ▁ 5 5   mm ▁long . ▁ ▁E col ogy ▁It ▁fe eds ▁on ▁sp ong es . ▁ ▁References ▁This ▁article ▁incorpor ates ▁Creative ▁Commons ▁( CC - BY - 4 . 0 ) ▁text ▁from ▁the ▁reference ▁ ▁External ▁links ▁ ▁Category : Dis c odor id idae ▁Category : G ast rop ods ▁described ▁in ▁ 1 9 6 7 ▁Category : T ax a ▁named ▁by ▁E vel ine ▁Du ▁Bo is - Re ym ond ▁Marcus ▁Category : T ax a ▁named ▁by ▁Ernst ▁Marcus ▁( zo ologist ) <0x0A> </s> ▁The ▁J ardin ▁de ▁la ▁vall ée ▁du ▁Ma el be ek ▁( F rench ) ▁or ▁Ma al be ek d alt u in ▁ ▁( D utch ) ▁is ▁a ▁small ▁green ▁space ▁on ▁the ▁corner ▁of ▁R ue ▁de ▁la ▁Lo i / W et stra at ▁and ▁/ ▁at ▁the ▁heart ▁of ▁the ▁European ▁Qu arter ▁of ▁Br uss els ▁( Bel g ium ). ▁It ▁was ▁inaugur ated ▁on ▁ 1 3 ▁May ▁ 1 9 5 1 . ▁ ▁The ▁park