Polyclinum arenosum Sluiter, 1898, Sluiter, 1898

Monniot, Françoise, 2012, Some ascidians from the southern coast of Madagascar collected during the “ AtimoVatae ” survey, Zootaxa 3197, pp. 1-42: 16-17

publication ID

http://doi.org/ 10.5281/zenodo.246182

DOI

http://doi.org/10.5281/zenodo.4893770

persistent identifier

http://treatment.plazi.org/id/3055E11F-FF9F-FF81-71A5-CE08FCCE693D

treatment provided by

Plazi

scientific name

Polyclinum arenosum Sluiter, 1898
status

 

Polyclinum arenosum Sluiter, 1898  

( Figures 12 A View FIGURE 12. A , 13 View FIGURE 13 )

Polyclinum arenosum Sluiter, 1898: 20   pl. 4 Fig. 1–2 View FIGURE 1 View FIGURE 2 , South Africa, Isipingo; Millar: 1955: 174; 1962: 135, South Africa, Natal.

Station. TA 12 ( MNHN A 1 POL.B 103).

The colony is entirely embedded with sand, in lobes erect on a common base ( Fig. 12 A View FIGURE 12. A ). Each lobe contains 8 to 10 zooids. The thoraces are included in the inflated upper part of the lobes 5mm in diameter. The oral siphon has 6 pointed lobes. The rim of the atrial aperture extends in a long languet with a pointed or dented tip ( Fig. 13 View FIGURE 13 A). A round button is present behind the atrial siphon. The thoracic musculature is weak with 8 to 10 longitudinal fibres on each side, which do not extend farther than the level of the fourth stigmata row. The branchial sac ( Fig. 13 View FIGURE 13 B) has 14–15 rows of stigmata and 15 stigmata in a half row on the right side in the middle of the branchial sac. Fourteen round and short papillae are on a transverse vessel at the same level. The short abdomen and the post-abdomen in shape of a drop have the common shape of the genus ( Fig. 13 View FIGURE 13 A). One to 3 larvae are incubated in a pouch hanging at the middle of the thoracic wall. They have 3 adhesive papillae separated by odd vesicles and 4 pairs of lateral round vesicles ( Fig. 13 View FIGURE 13 C). The trunk 0.4mm long is circled by the tail in half a turn and contains an oxalate crystal. The colony from the south of Madagascar exactly fits with the descriptions by Sluiter and Millar for specimens from South Africa. The colony shape is unique among the genus.

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Chordata

Class

Ascidiacea

Order

Enterogona

Family

Polyclinidae

Genus

Polyclinum

Loc

Polyclinum arenosum Sluiter, 1898

Monniot, Françoise 2012
2012
Loc

Polyclinum arenosum

Millar 1955: 174
Millar 1955: 1955
Sluiter 1898: 20
1898