Diplosoma listerianum ( Milne-Edwards, 1841 )

Page, M. J., Willis, T. J. & Handley, S. J., 2014, The colonial ascidian fauna of Fiordland, New Zealand, with a description of two new species, Journal of Natural History (J. Nat. Hist.) 48 (27 - 28), pp. 1653-1688 : 1681-1682

publication ID

https://doi.org/ 10.1080/00222933.2014.896487

publication LSID

lsid:zoobank.org:pub:5ADC2C9D-28AC-4348-8B4D-F262A43DEA66

persistent identifier

https://treatment.plazi.org/id/6C5C87F5-FFFB-3B4C-FE7E-50F5243FFC80

treatment provided by

Felipe

scientific name

Diplosoma listerianum ( Milne-Edwards, 1841 )
status

 

Diplosoma listerianum ( Milne-Edwards, 1841)

( Figure 13A View Figure 13 )

Leptoclinum listerianum Milne-Edwards, 1841: p. 300 View in CoL .

Diplosoma listeri Lahille, 1890: p. 104 , figs 58–60, 62, 65–69.

Diplosoma macdonaldi Herdman, 1886 ; Brewin, 1946, 1948, 1950b, 1951. Diplosoma listerianum Rowe, 1966: p. 458 (see Kott 2001 for synonymy).

Material examined

New records: Nine Fathom Passage, Dusky Sound (45° 44.237’S, 166° 53.199’E, 14 m, 31 February 2009, NIWA 49936 View Materials , two colonies); Caswell Sound, Paua Bay (45° 01.01’S, 167° 08.40’E, 18 m, 2 March 2009, NIWA 49988 View Materials ) GoogleMaps .

Previously recorded: tropical to temperate waters of the Pacific, Atlantic, Indian oceans and the Mediterranean and North Seas (See Kott 2001); New Zealand, Hauraki Gulf ( Brewin 1948, 1951); Napier ( Brewin 1952b); Cook Strait ( Brewin 1960); Christchurch ( Brewin 1950b); Portobello Peninsula ( Brewin 1946); Stewart Island ( Brewin 1958a).

Description

Colonies are thin translucent, encrusting gelatinous sheets, often overgrowing brachiopods and other sessile fauna. The zooids are visible in the tunic and they are grey, sometimes brown due to dark pigment on the thorax and sometimes the abdomen ( Figure 13A View Figure 13 ). The zooids are supported by a basal tunic connective in the cloacal cavity. The zooids are approximately 1.0 mm long with a retractor muscle originating halfway down the oesophageal neck and usually an oesophageal bud. There are two testis follicles with a straight vas deferens. Large spherical embryos (1.2 mm trunk length) are present in all Fiordland specimens. They have two pairs of long lateral ampullae and three median adhesive papillae.

Remarks

The absence of a black pigment spot in the dorsal mid-line anterior to the atrial aperture in specimens from Fiordland may be an artefact of preservation or intraspecific variation; different colonies can vary greatly in the amount of pigment. Because the colonies were soft and gelatinous, collapsed when sampled, and their larvae had only two pairs of ampullae, we are confident the species from Fiordland is D. listerianum .

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Caryophyllales

Family

Aizoaceae

Genus

Diplosoma

Loc

Diplosoma listerianum ( Milne-Edwards, 1841 )

Page, M. J., Willis, T. J. & Handley, S. J. 2014
2014
Loc

Diplosoma macdonaldi

Rowe, FWE 1966: 458
1966
Loc

Diplosoma listeri

Lahille, F 1890: 104
1890
Loc

Leptoclinum listerianum

Milne-Edwards, H 1841: 300
1841
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