Aplidium antillense ( Gravier, 1955 )

Sanamyan, Karen & Gleason, Daniel F., 2009, Ascidians of the genus Aplidium collected on shallow hard-bottom reefs of coastal Georgia (Atlantic coast of N America, U. S. A.), Zootaxa 2066, pp. 50-58: 51-52

publication ID

10.5281/zenodo.187005

persistent identifier

http://treatment.plazi.org/id/03DE87C4-FF96-A016-FF0D-E17AFDD4FA0D

treatment provided by

Plazi

scientific name

Aplidium antillense ( Gravier, 1955 )
status

 

Aplidium antillense ( Gravier, 1955) 

( Figures 1View FIGURE 1, 2)

Amaroucium antillense Gravier, 1955: 618  .

Aplidium antillense: Monniot, 1972: 953  ; 1983: 414.

Material examined: collected in 2004, at 31 ° 23.815 ' N, 80 ° 53.461 ' W, specimen # 172 ( KBPIG 1 / 1236) and at 31 ° 36.056 ' N, 80 ° 47.431 ' W, specimen # 190 ( KBPIG 2 / 1237); 2006, specimen # 36 ( KBPIG 3 / 1378) and specimen # 38 ( KBPIG 4 / 1379) both collected at 31 ° 36.056 ' N, 80 ° 47.431 ' W.

Previous records: Martinique ( Gravier, 1955), Guadeloupe ( Monniot, 1983) and Bermudas ( Monniot, 1972).

Description. Colony is a small low cushion with irregular margins ( KBPIG 1 / 1236, Fig. 1View FIGURE 1 A) or a flat sheet up to 40 x 35 mm in extent and 8–9 mm thick ( KBPIG 2 / 1237, Fig. 1View FIGURE 1 B). Zooids are arranged in double rows separated by oval or irregular zooid-free spaces that are slightly elevated. The limits of each system and a common cloacal opening are not discernible. Fine sand grains are spread over the surface and present throughout the colony, but only occasionally abundant. Otherwise the test is colourless and transparent. Living specimens are described by collectors as having an "almost transparent tunic with visible orange zooids inside".

Most zooids are strongly contracted and have short posterior abdomens. Less contracted zooids are rarer and up to 7.5 mm in length, half of which consists of the posterior abdomen. A simple atrial languet arises from the upper rim of the small atrial opening. The branchial sac has either 12 ( KBPIG 1 / 1236) or 11 or 12 ( KBPIG 2 / 1237) rows of stigmata. A cylindrical stomach, located in the middle of the abdomen, has 12–14 high, strait unbroken folds. The ovary, containing one or two large ova, is in the middle of the posterior abdomen. The testis follicles are serially arranged in two rows just posterior to the ovary. The sperm duct is very thick in all zooids and sometimes fills almost the entire width of the anterior part of the posterior abdomen.

Up to five serially arranged embryos are in the atrial cavity of almost all zooids examined. The trunk of the tailed larva is 0.75 mm in length. Three or occasionally four adhesive organs alternate with wide, short median ampullae (which are sometimes absent) and bunches of epidermal vesicles branching off of them. A single arc of vesicles is on each side of the adhesive organs.

Remarks. The present specimens conform to those described by Monniot (1972, 1983). The larva illustrated by Monniot (1972, Fig. 2 D) appears to be immature and groups of epidermal vesicles between the adhesive organs are not shown.

Kingdom

Animalia

Phylum

Chordata

Class

Ascidiacea

Order

Enterogona

Family

Polyclinidae

Genus

Aplidium

Loc

Aplidium antillense ( Gravier, 1955 )

Sanamyan, Karen & Gleason, Daniel F. 2009

2009
Loc

Amaroucium antillense

Gravier 1955: 618

Loc

Aplidium antillense:

Monniot 1972: 953