parent_taxon margaretia
___MASK75___ is a genus of seaweeds in the family Caulerpaceae ( among the green algae ). They are unusual because they consist of only one cell with many nuclei , making them among the biggest single cells in the world . A species in the Mediterranean can have a stolon more than 3 metres ( 9 ft ) long , with up to 200 fronds . In biology , stolons ( from Latin stol " branch "), also known as runners , are horizontal connections between organisms . They may be part of the organism , or of its skeleton ; typically , ___MASK15___ stolons are external skeletons . A frond is a large , divided leaf . In both common usage and botanical nomenclature , the leaves of ___MASK88___ are referred to as fronds and some botanists restrict the term to this group . Other botanists allow the term frond to also apply to the large leaves of cycads and palms ( ___MASK20___ ). " Frond " is commonly used to identify a large , compound leaf , but if the term is used botanically to refer to the leaves of ___MASK88___ , it may be applied to smaller and undivided leaves . In taxonomy , the ___MASK50___ are a family of green algae , specifically of the ___MASK74___ . Margaretia is a frondose organism known from the middle Cambrian Burgess shale . Its fronds reached about 10 cm in length and are peppered with a range of length - parallel oval holes . Its original interpretation as a green alga is not secure ; it also resembles some alcyonarian corals , but a thorough redescription will be necessary to securely classify it . A relationship with the modern green alga ___MASK75___ is the most up - to - date consideration .