anteriorly rounded, posteriorly extending to chaetiger.
zulu Specimens One clitellate; Only one, with and their one with clitellum not maturity developing fully developed tubercula pubertatis Characters Length Large, 185 mm abscised Diameter 12 mm 9-11 mm Prostomium
Not observed Epilobous, short, broad Number of Abscised, 135 segments not observed Setae Minute, Minute, only difficult to on some segments, detect closely paired Annulation Not described; 4(?
These worms are smooth-bodied and relatively fragile in comparison with other tubificids, with short postclitellar segments and conical prostomium
when fixed in alcohol (Fig.
The shell-boring polychaete species were identified on the basis of fifth setiger chaetae, prostomium
and pygidium morphology, and branchiae distribution.
The scientific name for this kind of mouth segment is a prostomium
, Jacobs explains.
is conical and shorter or equal to its base at the peristomium.
transverse, short, longitudinally striated; dorsal setae of anterior body region single, ventral setae doubled, no setae in posterior body region; ventral tuberculum single.
The specific name naso is a noun derived from the Latin word nasus (nose) and the Roman personal name Naso, emphasizing the nose-like prostomium
of this worm.
Morphologically, it is characterized by a blunt prostomium
forming a hood over its mouth.
epilobous, often invaginated inside first segment.
Etymology: From Latin proboscis, referring to the presence of two protrusions on the prostomium