''Cancellus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

hermit crab Hermit crabs are anomuran decapod crustaceans of the superfamily Paguroidea that have adapted to occupy empty scavenged mollusc shells to protect their fragile exoskeletons. There are over 800 species of hermit crab, most of which possess an a ...

s in the family

Diogenidae The Diogenidae are a family of hermit crabs, sometimes known as "left-handed hermit crabs" because in contrast to most other hermit crabs, its left chela (claw) is enlarged instead of the right. It comprises 429 extant species, and a further 46 e ...

. Members of this genus are most commonly found living in small crevices in the outer contintental shelf at

mesophotic A Mesophotic coral reef or mesophotic coral ecosystem (MCE), originally from the Latin word ''meso'' (meaning middle) and ''photic'' (meaning light), is characterised by the presence of both light-dependent coral and algae, and organisms that can b ...

depths. They can be found living in rocks,

sponges Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate throug ...

, and

algae Algae ( , ; : alga ) are any of a large and diverse group of photosynthetic, eukaryotic organisms. The name is an informal term for a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from ...

among other places. The genus has a cosmopolitan distribution. Four species are known from the western

Atlantic The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the "Old World" of Africa, Europe an ...

(''C. heatherae'', ''C. ornatus'', ''C. viridis'', and C. ''spongicola'').

Species

''Cancellus'' contains 17 species: * ''

Cancellus canaliculatus Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the la ...

'' (Herbst, 1804) * ''

Cancellus frontalis Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' Forest & McLaughlin, 2000 *''

Cancellus heatherae Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' * ''

Cancellus investigatoris Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the la ...

'' Alcock, 1905 * ''

Cancellus laticoxa Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the la ...

'' Forest & McLaughlin, 2000 * '' Cancellus macrothrix'' Stebbing, 1924 * ''

Cancellus mayoae Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' Forest & McLaughlin, 1998 * '' Cancellus ornatus'' Benedict, 1901 * ''

Cancellus panglaoensis Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' McLaughlin, 2008 * ''

Cancellus parfaiti Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' A. Milne-Edwards & Bouvier, 1891 * ''

Cancellus quadraticoxa Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' Morgan & Forest, 1991 * ''

Cancellus rhynchogonus Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' Forest & McLaughlin, 2000 * ''

Cancellus sphaerogonus Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' Forest & McLaughlin, 2000 * ''

Cancellus spongicola Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' Benedict, 1901 * ''

Cancellus tanneri Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' Faxon, 1893 * ''

Cancellus typus Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the latt ...

'' H. Milne-Edwards, 1836 * ''

Cancellus viridis Cancelli are lattice-work, placed before a window, a door-way, the tribunal of a judge, the chancel of a church, or any other similar place. This led to the occupation of cancellarius, which originally signified a porter who stood at the la ...

'' Mayo, 1973

References

{{Taxonbar, from=Q4476036 Diogenidae