Cerebral ocelli are defined here as being located in close association with the brain, within the peristomium or prostomium
(excluding the radioles).
websteri exhibit a high degree of morphological plasticity in the palp pigmentation pattern, the shape of the anterior edge of the prostomium
, the shape of the major spines on chaetiger 5, and the shape of the pygidium.
Antennae and peristomial cirri are articulated; the antennae have teardrop shaped distal segments and the 3 to 4-segmented peristomial cirri reach to the middle of the prostomium
with a medium antenna originated from the middle zone of the eye pair (Fig.
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.
is the presence of a pair of well developed anterior lateral horns on the prostomium
The scientific name for this kind of mouth segment is a prostomium
, Jacobs explains.
Selected animals were placed in ethanol solution (5%) and dissected to extract the male reproductive organs, located between the prostomium
and the clitellum.
is conical and shorter or equal to its base at the peristomium.