Table 2 Holoplanktonic and meroplanktonic polychaete species identified in the study area: total mean weighted  density over all stations, per cent contribution, number of counted specimens (N), size range with mean value (X), standard deviation (±SD) and number of specimens measured (n).

From: The Otranto Channel (South Adriatic Sea), a hot-spot area of plankton biodiversity: pelagic polychaetes

Species

Density

(ind./100 m3)

Percent

%

N

Size range

(mm)

X

(mm)

(±SD)

n

Holoplanktonic

Lopadorrhynchidae Claparède, 1870

  Lopadorrhynchus brevis Grube, 1855

0.13

0.20

9

1.29–2.23

2.00

0.47

3

  Lopadorrhynchus uncinatus Fauvel, 1915

0.13

0.20

9

2.11–16.47

10.37

7.48

4

  Maupasia coeca Viguier, 1886

0.83

1.25

58

1.76–3.76

2.50

0.68

14

  Pedinosoma curtum Reibisch, 1895

0.04

0.06

3

4.00

4.00

—

1

  Pelagobia longicirrata Greeff, 1879

0.13

0.20

9

1.41–2.94

2.35

0.64

4

Alciopidae Ehlers, 1864

  Alciopina parasitica Claparède & Panceri, 1867

0.04

0.06

3

4.35–6.47

5.76

1.22

2

  Krohnia lepidota (Krohn, 1845)

8.83

13.36

623

1.17–7.64

3.07

1.18

115

  Naiades cantrainii Delle Chiaje, 1830

1.74

2.63

123

2.94–13.52

5.33

2.94

31

  Plotohelmis capitata (Greeff, 1876)

0.07

0.10

5

6.11

6.11

—

1

  Plotohelmis tenuis (Apstein, 1900)

0.05

0.07

3

3.17–7.64

6.15

2.58

2

  Rhynchonereella gracilis Costa, 1864

0.37

0.56

26

1.18–5.64

4.14

1.29

6

  Rhynchonereella moebii (Apstein, 1893)

0.05

0.07

3

9.29

9.29

—

1

  Vanadis crystallina Greeff, 1876

2.58

3.91

182

1.17–20.58

6.57

5.16

41

  Vanadis formosa Claparède, 1870

1.99

3.01

140

2.92–20.00

6.64

3.76

44

Tomopteridae Johnston, 1865

  Enapteris euchaeta Chun, 1888

0.05

0.07

3

12.35

12.35

—

1

  Tomopteris apsteini (Rosa, 1908)

0.16

0.24

11

2.35–23.52

11.09

9.75

6

  Tomopteris catharina (Gosse, 1853)

0.16

0.24

11

2.35–11.76

8.27

3.08

9

  Tomopteris ligulata Rosa, 1908

19.41

29.38

1370

1.17–7.41

2.90

0.95

383

  Tomopteris pacifica (Izuka, 1914)

7.28

11.03

514

1.17–7.05

3.67

1.12

154

  Tomopteris planktonis Apstein, 1900

2.53

3.83

179

2.11–6.00

3.85

0.98

32

  *Tomopteris sp.

14.79

22.38

1044

0.70–5.29

3.06

0.97

203

Typhloscolecidae Uljanin, 1878

  Sagitella kowalevskii Wagner, 1872

1.83

2.78

129

2.35–7.17

5.32

1.25

42

  Travisiopsis lanceolata Southern, 1910

0.35

0.53

25

2.35–4.94

4.00

0.86

7

  *Travisiopsis sp.

0.26

0.40

18

3.76–4.11

3.99

0.20

2

Meroplanktonic

Poecilochaetidae Hannerz, 1956

  Poecilochaetus serpens larvae Allen, 1904

0.03

0.04

2

3.17

3.17

—

1

Syllidae Grube, 1850

Syllidae larvae

1.18

1.78

83

2.11–3.29

2.63

0.40

13

Nondetermined polychaete larvae

1.07

1.62

76

1.76–2.58

2.17

0.30

32

  1. *Remarks: Juvenile specimens not assigned certainly to a species.
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