Deep-sea (250-1,550 m) Benthic Thanatocoenoses from the Southern Tyrrhenian Sea
Table 3. Bryozoa: systematic list (see text for explanation)
248-S0Sm
.37.12,23
F
A
Bryozoa
Crisia tenella Calvet longinodata (Rosso)
1
5
Anguisia verrucosa (Jullien)
3
8
Entalophoroecia gracilis (Harmelin)
36
Tubulipora sp. 1
Thrvia irregularis (Meneghini)
Hornera lichenoides (Linnaeus)
Setosella folini (Jullien)
Palmicellaria cr. elegans (Alder)
Gemellipora eburnea (Srnitt)
Chararodoma mamillatum (Seguenza)
Tessaradoma bore ale (Busk)
1
32
Jaculina tessellata (Hayward)
1
2
Reteporella sparteli (Calvet)
Table 4. Serpulidae: systematic list (see text for explanation)
248-505m
37,23
F
A
Serpulidae
Pilogranula stellata (Southward)
Pilograna sp. 1
Hyalopomatus variorugosus
1
3
(Ben Eliahu and Fiege)
Hyalopomatus sp.
1
thyasirids},pteromorphs (10.5%) andscaphopods
(9.1%). Many species were small-sized and thinshelled and three dominant bivalves were micromorphic. i.e. Kelliella abyssicola, Microgloma
tumidula (one of the smallest bivalves;
Ockelmann and Waren 1998) and Yoldiella micrometrica. It is worth noting the presence of two
species, Xylophaga dorsalis and Copulabyssia corrugata, known from organic substrates (sunken
wood) (Janssen 1989).
Typical deep-sea genera are also the bryozoans Anguisia, Gemellipora and /aculina
(Lagaaij and Cook 1973; Hayward 1981). All the
species have small-sized colonies, mostly with unito-pauciserial branches. Erect rigid morphoses
(vinculariforms) largely prevail and only two
species have flexible morphoses. Colonies often
encrust small pteropod fragments or other bryozoans but they were rarely found on the pumice
"N'
696-1096m
"B U
1139-1S36m
"c"
35,36, 39, 33,
14, 7, 32B, 16,
26, 25, 30, 31, 27B
11.13,9,15,34
rnA
F
A
rnA
F
A
rnA
1.66
5
20
1.66
1
4
0.30
2.66
9
82
6.83
7
50
3.84
12.00
2
8
0.61
4
9
0.75
7
35
2.69
1
0.08
1
1
0.08
2
5
0.42
1
1
0.07
2
2
0.16
1
0.07
3
5
0.42
10.66
1
0.07
0.66
2
3
0.25
5
8
0.66
5
16
1.23
CCA"
696-1096m
(CB"
1139-1536m
"C»
35,39,33,
14, 7,44,32B, 16,
26,25, 30, 27B
2B, 10, 3, 8, 9, 15,34
rnA
F
A
rnA
F
A
rnA
3
8
0.66
10
70
5.38
3
5
0.42
6
6
0.46
1.00
6
25
2.08
3
6
0.46
0.33
3
7
0.58
4
6
0.46
pebbles. Two species appeared specially adapted to
fine-grained bottoms, i.e. Characadoma mamillatum with rod-like colonies bearing rhizoids (cellarinelliform, Rosso 1999), and Setosella folin;
exhibiting uniserial. scorpioid, probably free-living colonies.
Among serpulids, Hyalopomatus variorugosus and Filogranula stellata were the most frequent. Hyalopomatus is a typically bathyal genus
(Zibrowius 1977). All tubes were small-sized,
particularly of H. variorugosus, which did not
exceed 200 ]lm in diameter. This species was generally present in samples with coarse sediments,
where it was mainly found on pumice pebbles.
sometimes cryptic within small cavities
(Sanfilippo 1998).
The Cefalu Basin assemblages are slightly
poorer than those from the Gioia Basin, where
the serpulid Hyalopomatus variorugosus is
281
Table 3. Bryozoa: systematic list (see text for explanation)
248-S0Sm
.37.12,23
F
A
Bryozoa
Crisia tenella Calvet longinodata (Rosso)
1
5
Anguisia verrucosa (Jullien)
3
8
Entalophoroecia gracilis (Harmelin)
36
Tubulipora sp. 1
Thrvia irregularis (Meneghini)
Hornera lichenoides (Linnaeus)
Setosella folini (Jullien)
Palmicellaria cr. elegans (Alder)
Gemellipora eburnea (Srnitt)
Chararodoma mamillatum (Seguenza)
Tessaradoma bore ale (Busk)
1
32
Jaculina tessellata (Hayward)
1
2
Reteporella sparteli (Calvet)
Table 4. Serpulidae: systematic list (see text for explanation)
248-505m
37,23
F
A
Serpulidae
Pilogranula stellata (Southward)
Pilograna sp. 1
Hyalopomatus variorugosus
1
3
(Ben Eliahu and Fiege)
Hyalopomatus sp.
1
thyasirids},pteromorphs (10.5%) andscaphopods
(9.1%). Many species were small-sized and thinshelled and three dominant bivalves were micromorphic. i.e. Kelliella abyssicola, Microgloma
tumidula (one of the smallest bivalves;
Ockelmann and Waren 1998) and Yoldiella micrometrica. It is worth noting the presence of two
species, Xylophaga dorsalis and Copulabyssia corrugata, known from organic substrates (sunken
wood) (Janssen 1989).
Typical deep-sea genera are also the bryozoans Anguisia, Gemellipora and /aculina
(Lagaaij and Cook 1973; Hayward 1981). All the
species have small-sized colonies, mostly with unito-pauciserial branches. Erect rigid morphoses
(vinculariforms) largely prevail and only two
species have flexible morphoses. Colonies often
encrust small pteropod fragments or other bryozoans but they were rarely found on the pumice
"N'
696-1096m
"B U
1139-1S36m
"c"
35,36, 39, 33,
14, 7, 32B, 16,
26, 25, 30, 31, 27B
11.13,9,15,34
rnA
F
A
rnA
F
A
rnA
1.66
5
20
1.66
1
4
0.30
2.66
9
82
6.83
7
50
3.84
12.00
2
8
0.61
4
9
0.75
7
35
2.69
1
0.08
1
1
0.08
2
5
0.42
1
1
0.07
2
2
0.16
1
0.07
3
5
0.42
10.66
1
0.07
0.66
2
3
0.25
5
8
0.66
5
16
1.23
CCA"
696-1096m
(CB"
1139-1536m
"C»
35,39,33,
14, 7,44,32B, 16,
26,25, 30, 27B
2B, 10, 3, 8, 9, 15,34
rnA
F
A
rnA
F
A
rnA
3
8
0.66
10
70
5.38
3
5
0.42
6
6
0.46
1.00
6
25
2.08
3
6
0.46
0.33
3
7
0.58
4
6
0.46
pebbles. Two species appeared specially adapted to
fine-grained bottoms, i.e. Characadoma mamillatum with rod-like colonies bearing rhizoids (cellarinelliform, Rosso 1999), and Setosella folin;
exhibiting uniserial. scorpioid, probably free-living colonies.
Among serpulids, Hyalopomatus variorugosus and Filogranula stellata were the most frequent. Hyalopomatus is a typically bathyal genus
(Zibrowius 1977). All tubes were small-sized,
particularly of H. variorugosus, which did not
exceed 200 ]lm in diameter. This species was generally present in samples with coarse sediments,
where it was mainly found on pumice pebbles.
sometimes cryptic within small cavities
(Sanfilippo 1998).
The Cefalu Basin assemblages are slightly
poorer than those from the Gioia Basin, where
the serpulid Hyalopomatus variorugosus is
281