Protobonellia mitsukurii Ikeda, 1908

Biseswar, Ramlall, 2010, Report on deep-sea bonelliids (Echiura) from the East Equatorial Atlantic Ocean, Zoosystema 32 (1), pp. 139-154 : 150

publication ID

https://doi.org/ 10.5252/z2010n1a7

DOI

https://doi.org/10.5281/zenodo.4520674

persistent identifier

https://treatment.plazi.org/id/137387F1-A071-9358-FD6E-FECEFF6D381A

treatment provided by

Felipe

scientific name

Protobonellia mitsukurii Ikeda, 1908
status

 

Protobonellia mitsukurii Ikeda, 1908 View in CoL

( Fig. 5A, B View FIG )

MATERIAL EXAMINED. — East Equatorial Atlantic Ocean. BIOZAIRE 2, KGS 39, stn D, 05°50.985’S, 008°21.805’E, 3950 m, 25.XI.2001, 1 ♀.

DESCRIPTION

Proboscis is cream, trunk is beige in preserved specimen. Proboscis is 4.5 mm long, broad, truncate with a constriction at distal end ( Fig. 5A View FIG ). Lateral margins of proboscis unite at base forming narrow lower lip ventral to mouth. Trunk is ovoid ( Fig. 5A View FIG ), 3.5 mm long and 2.6 mm across broadest part, damaged at posterior end. Integument is thick and opaque. Elongated papillae are transversely aligned over entire surface of trunk more prominent and densely aggregated at anterior end. Ventral setae golden-yellow, 3 mm in length with straight cylindrical shaft and flattened, curved terminal blade, terminating in a pointed tip ( Fig. 5B View FIG ).

Only small, proximal fragment of gonoduct is present on left side of nerve cord. Gonostome not seen, probably damaged due to poor preservation Anal vesicles missing.

REMARKS

The genus Protobonellia is distinguished by the presence of a truncated proboscis, a pair of ventral setae and a single gonoduct with a basally located gonostome. The species P. mitsukurii was originally described by Ikeda (1908) from a single specimen from Sagami Bay, Japan. This species was later recorded and redescribed by DattaGupta (1975, 1981). Except for some minor differences,the present specimen approaches the descriptions given by the above authors. Unfortunately, the anal vesicles and other internal organs are damaged in the specimen on hand. According to Ikeda (1908), the anal vesicles are two slender tubes that bear numerous long-stalked funnels.

Protobonellia mitsukurii has been recorded in the North Atlantic by DattaGupta (1981). Its discovery in the east Equatorial Atlantic Ocean is a new record for this region which extends its range of distribution.

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