Pseudodistoma megalarva Monniot F. & Monniot C., 1996

Monniot, Françoise & Monniot, Claude, 2001, Ascidians from the tropical western Pacific, Zoosystema 23 (2), pp. 201-383 : 227

publication ID

https://doi.org/ 10.5281/zenodo.5391440

persistent identifier

https://treatment.plazi.org/id/F57D87A3-FFC5-3121-EA52-FCD4FB971080

treatment provided by

Marcus

scientific name

Pseudodistoma megalarva Monniot F. & Monniot C., 1996
status

 

Pseudodistoma megalarva Monniot F. & Monniot C., 1996 View in CoL

Pseudodistoma megalarva Monniot F. & Monniot C., 1996: 147 , fig. 6F, J, pl. 2A. Type locality: Indonesia. MATERIAL EXAMINED. — Palau. Koror, West Uchelbeluu Reef, Short Dropoff, 7°16.51’N, 134°31.55’E, 10 m, 12.VIII.1996 (MNHN A1 PSE 38). — Siaes tunnel, west barrier reef, 7°18.76’N, 134°13.50’E, 3 m, 22.XII.1997 (MNHN A1 PSE 48).

Pseudodistoma novaezelandiae ( Brewin, 1950) View in CoL ( Figs 20 View FIG ; 114F View FIG )

Sigillinaria novaezelandiae Brewin, 1950: 534 . Type locality: New Zealand.

Pseudodistoma novaezelandiae View in CoL – Millar 1982: 44.

MATERIAL EXAMINED. — Papua New Guinea. Louisiade Archipelago, Conflict Group, 10°43.52’S, 151°44.54’E, 40 m, 29. V.1998 ( MNHN A1 PSE 54). — Coral Sea, eastern fields, 10°02.22’S, 145°33.01’E, 23 m, 14. VI.1998 ( MNHN A1 PSE 53).

DESCRIPTION

The colonies form elongate, ovoid stoutly pedunculate lobes arising from a common base. The sand-free tunic is opaque, brown ( Fig. 114F View FIG ) or dark grey with white perisiphonal patches. There are no systems. The thoraces lie perpendicular to the colony surface, both siphons opening near each other. The abdomen and very long postabdomen lie parallel to the lobe’s long axis. The post-abdomen is so long that the zooid may reach 5 cm. Both siphons have six lobes ( Fig. 20A View FIG ). The thorax is wider than high. There are three rows of numerous stigmata. We counted about 20 longitudinal muscles on each side, regularly spaced.

The abdomen ( Fig. 20A View FIG ) is longer than the thorax and has a long oesophagus. The stomach has a smooth wall or four folds. The post-abdomen is particularly long and contains the gonads in its very posterior part, with the ovary immediately anterior to the testis follicles ( Fig. 20B View FIG ).

The larvae are incubated in a dilated pouch of the cloacal cavity, without peduncle.

The larval trunk measures 0.72 mm. It has three large adhesive papillae in a line, each encircled by a cup-shaped structure made of thin lamellae ( Fig. 20C View FIG ).

REMARKS

This species is characterised by its larvae and by the opaque and pigmented tunic of the pedunculate lobes of the colony. It has been known only from the north of New Zealand.

V

Royal British Columbia Museum - Herbarium

MNHN

Museum National d'Histoire Naturelle

VI

Mykotektet, National Veterinary Institute

Kingdom

Animalia

Phylum

Chordata

Class

Ascidiacea

Order

Aplousobranchia

Family

Pseudodistomidae

Genus

Pseudodistoma

Loc

Pseudodistoma megalarva Monniot F. & Monniot C., 1996

Monniot, Françoise & Monniot, Claude 2001
2001
Loc

Pseudodistoma novaezelandiae

MILLAR R. H. 1982: 44
1982
Loc

Sigillinaria novaezelandiae

BREWIN B. I. 1950: 534
1950
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