Colossendeidae

Colossendeidae is a family of sea spider (class Pycnogonida). Like most sea spiders, species in this family have four pairs of legs, except for three species (Decolopoda australis, D. qasimi, and Pentacolossendeis reticulata) with five leg pairs, including the first polymerous (i.e., extra-legged) sea spider discovered (D. australis), and one giant species (Dodecolopoda mawsoni, with legs that can span 20 inches) that was the first sea spider discovered with six leg pairs.

Colossendeidae
Temporal range:
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Pycnogonida
Order: Pantopoda
Family: Colossendeidae
Genera

Colossendeis
Decolopoda
Dodecolopoda
Hedgpethia
Rhopalorhynchus

Diversity
5 genera
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