In Sevastopol bays samples were collected monthly for 13 months. On other areas
of the Crimean coastal zone samples were taken in the summer once. Samples were
taken at two sections, in duplicate.
The length of the worms was measured using an ocular micrometer. Before
weighing worms dried on filter paper then weighed to the nearest 0.0005 mg.
24.3 Results
Polychaetes P. kefersteini have roundish-conical prostomium with two pairs of
eyes. Palps with palpostyle. Antennae short, cylindrical. Pygidium with 2 long and
2 short anal cirri. Dorsal tuft of adult worms combines both simple (hair-like, or
capilliform) and forked chaetae; ventral tuft is of compound chaetae. Body length to
15–20 mm, 5–10-mm long individuals prevail. Body yellowish in colour (Begun
et al. 2010; Jumars 1974; Kiseleva 2004).
Adult worms from our samples were to 2–3.5 mm in length (16–28 segments),
palps to 0.35–0.5 mm long (Fig. 24.2).
Carrying out this study, we observed growth and development of juvenile and
young P. kefersteini which inhabited 1 m and 1.5 m depths (Fig. 24.3).
Individuals with the body of one segment have well-developed jaws, two pair of
eyes, hair-like chaetae, two pairs of pygidial cirri. In 2–3 segment worms compound chaetae appear in addition to the capilliform. Forked chaetae arise on the first
two anterior segments of 4-segment worms and on the first three segments of
5-segment polychaetes. As the body is growing on, the fourth anterior segment of
6–8-segment worms and the fifth and sixth segments of 9–10-segment individuals
Fig. 24.1 The map of sampling locations
24 Some Aspects of the Biology and the Present State of the Population. . .
407
of the Crimean coastal zone samples were taken in the summer once. Samples were
taken at two sections, in duplicate.
The length of the worms was measured using an ocular micrometer. Before
weighing worms dried on filter paper then weighed to the nearest 0.0005 mg.
24.3 Results
Polychaetes P. kefersteini have roundish-conical prostomium with two pairs of
eyes. Palps with palpostyle. Antennae short, cylindrical. Pygidium with 2 long and
2 short anal cirri. Dorsal tuft of adult worms combines both simple (hair-like, or
capilliform) and forked chaetae; ventral tuft is of compound chaetae. Body length to
15–20 mm, 5–10-mm long individuals prevail. Body yellowish in colour (Begun
et al. 2010; Jumars 1974; Kiseleva 2004).
Adult worms from our samples were to 2–3.5 mm in length (16–28 segments),
palps to 0.35–0.5 mm long (Fig. 24.2).
Carrying out this study, we observed growth and development of juvenile and
young P. kefersteini which inhabited 1 m and 1.5 m depths (Fig. 24.3).
Individuals with the body of one segment have well-developed jaws, two pair of
eyes, hair-like chaetae, two pairs of pygidial cirri. In 2–3 segment worms compound chaetae appear in addition to the capilliform. Forked chaetae arise on the first
two anterior segments of 4-segment worms and on the first three segments of
5-segment polychaetes. As the body is growing on, the fourth anterior segment of
6–8-segment worms and the fifth and sixth segments of 9–10-segment individuals
Fig. 24.1 The map of sampling locations
24 Some Aspects of the Biology and the Present State of the Population. . .
407