Alomasoma, Zenkevitch, 1958

Biseswar, Ramlall, 2006, Additions to the deep-sea echiuran (Echiura) fauna of the North-East Atlantic, Zoosystema 28 (4), pp. 853-864 : 862-863

publication ID

https://doi.org/ 10.5281/zenodo.4689879

DOI

https://doi.org/10.5281/zenodo.4893239

persistent identifier

https://treatment.plazi.org/id/03F53669-FFEF-FFF4-FCE2-BC93208EC793

treatment provided by

Felipe

scientific name

Alomasoma
status

 

Alomasoma View in CoL sp.

( Fig. 4B View FIG )

MATERIAL EXAMINED. — Porcupine Abyssal Plain, BEN- GAL 5, Discovery 231, stn 13368#48, 48°49.64’N, 16°30.12’W, 4841 m, 17.III.1998, 1 ♀.

DESCRIPTION

Colour of trunk cream, proboscis white in preserved state. Proboscis truncate, 0.75 mm long, flattened and rounded distally; lateral margins curl inwards and unite proximally forming narrow lower lip ventral to mouth ( Fig. 4B View FIG ). Trunk oval ( Fig. 4B View FIG ), 2.5 mm long and 2 mm across broadest part. Integument smooth, thin and transparent. Ventral setae absent.

Gonoducts one pair, sac-like with eggs which unite proximally and open to exterior by single genital aperture. Gonostomes basal in position. Intestine filled with fine sand not moulded into faecal pellets. Rest of internal organs damaged.

REMARKS

The present specimen has been assigned to the genus Alomasoma Zenkevitch, 1958 on account of the presence of two gonoducts which unite proximally and open to the exterior via a common gonopore. This sexually mature specimen with a trunk length of 2.5 mm is extremely small in comparison with all the other species described in the genus. Therefore, it seems very likely that the specimen on hand represents an undescribed species. However, it is undesirable to erect a new species on the basis of single, incomplete individual. Additional material in the future will probably shed more light on its taxonomic position.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Echiuroidea

Family

Bonelliidae

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