''Chamaesipho tasmanica'' is an intertidal shoreline

barnacle A barnacle is a type of arthropod constituting the subclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in eros ...

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

. Its principal range centers in

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

, and

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

. Columnar colonies can be found on high intertidal rocks relatively free of dense seaweed. Individuals are small, less than 15 mm, and grayish in color.

Definition and discussion

''Chamaesipho tasmanica'' is a small species, with carinorostral diameter of about 10 mm, much smaller than '' Chamaesipho brunnea'', and similar in size to ''

Chamaesipho columna ''Chamaesipho columna'' is the type species for the barnacle genus ''Chamaesipho''. Originally, species concept, as refined by Darwin

''. Crowded colonies become columnar. The

scutum The ''scutum'' (; plural ''scuta'') was a type of shield used among Italic peoples in antiquity, most notably by the army of ancient Rome starting about the fourth century BC. The Romans adopted it when they switched from the military formati ...

possesses a clear rounded adductor ridge, best developed of all species of ''

Chamaesipho ''Chamaesipho'' is a genus of four-plated notochthamaline barnacles in the Pacific Ocean limited to Australian/New Zealand temperate waters. They are intertidal in preference, and tend to form crowded columnar colonies. They can be identified i ...

''. Articular ridge is large, rounded, with deep articular furrow. The

tergum A ''tergum'' (Latin for "the back"; plural ''terga'', associated adjective tergal) is the Anatomical terms of location#Dorsal and ventral, dorsal ('upper') portion of an arthropod segment other than the head. The Anatomical terms of location#Ante ...

is higher than the other two species, with a broad distinct articular furrow, and 3-7 tergal depressor crests, and no tergal spur. Card setae are present only on

anterior rami The ventral ramus (pl. ''rami'') (Latin for ''branch'') is the anterior division of a spinal nerve. The ventral rami supply the antero-lateral parts of the trunk (anatomy), trunk and the limbs. They are mainly larger than the dorsal ramus of spinal ...

of cirrus I and cirrus II.

Nomenclature and synonymy

* ''Chamaesipho tasmanica'' Foster & Anderson, 1986: 58 (original description); Poltarukha, 2006 (supplemental description and cirral setation formulae). * ''Chamaesipho columna'' (Spengler, 1790) in part of authors (Australian localities only); see Foster & Anderson, 1986: 59 for Australian references list. * Type locality: Manly Beach (south end), Sydney, Australia, approximately ). * Type specimens repository: Holotype: Australian Museum, Sydney, P35692. Paratypes: Australian Museum, P35693; National Museum of New Zealand, Wellington, NMNZ Cr. 3359.

Vernacular name

Locally, this species is called the honeycomb barnacle, from its appearance in crowded colonies.

Geographic and environmental data

The natural range of ''Chamaesipho tasmanica'' is restricted to

n waters, principally

and

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

. Northernmost reported locality is

Cape Byron Cape Byron is the easternmost point of the mainland of Australia, located in New South Wales. It is about east of the town of Byron Bay, New South Wales and projects into the Pacific Ocean at 28.6335° S, 153.6383° E. A lighthouse is situated th ...

in northern New South Wales. West of Tasmania, it is known as far as Point Sinclair in Great Australian Bight. The species has been noted once at

Lord Howe Island Lord Howe Island (; formerly Lord Howe's Island) is an irregularly crescent-shaped volcanic remnant in the Tasman Sea between Australia and New Zealand, part of the Australian state of New South Wales. It lies directly east of mainland P ...

. ''Chamaesipho tasmanica'' is found on rocks in high intertidal zone in exposed areas. It will not settle on other substrates, and will not colonize sheltered areas. ''C. tasmanica'' is subject to whelk predation, so will avoid seaweed covered locations which give shelter to whelks.

References

External links

* {{Taxonbar, from=Q16975596 Barnacles Crustaceans of Australia