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hrl. BALSAMO, E. FREGNI, P. TONGIORGI
Genus Pfychostomella Remane, 1926 Tetranchyroderma papii Gerlach, 1953
Ptychostomella mediterranea Remane, 1927 Porto Palo. 1-2 ni
Castrorcale. 2-3 m In Italy, T. papii is known from Tuscany, Latium,
Campania, Apulia, Friuli and Sardinia.
The single specimen found sl-iowed a smaller body
length, 178 pm, compared with 190 pm of the original Tetranchyroderma polyprobolostomum
description. In Italy, P mediteri-allea has been found i11
Tuscany, the Tuscan archipelago, Latium, the island of Hun-in-ion,Todaro, Balsamo & Tongiorgi, 1996
Ponza, Campania and Sardinia.
Giardini Naxos, 2-3 m.
Ptychostomella tyrrhenica Hummon, Todaro & The only specimen collected was 450 pm long and
sexually mature. The species has previously only been
Tongiorgi, 1993 found along the coast of Campania and at the island of
Procida.
Trappeto, 2-3 m; S. Vito lo Capo, 1-2 m: Giardini Naxos, littoral,
2-3 m; Castroreale, 2-3 m; S. Ambrogio, 2-3 m.
The specimens from the sublittoral sample of Trap- Tetranchyroderma sardum Todaro, Balsamo &
peto (Palermo) were longer than reported in the
literature, 197-226 vs 170-185 pm. In Italy, P. tyrrt~enica Tongiorgi, 1988
has been reported in Liguria, Tuscany, Tuscan ar-
chipelago (Elba), Latium, the island of Ponza, Campania Lido Arenella, 1-2 m.
and the island of Ischia.
Al1 the specimens collected fully matched the original
Genus Tetranchyroderma Remane, 1926 description of this species. To date T. sardum has been
found in Sardinia, on the coast of Campania and at the
Tetranchyroderma anomalopsum Hummon, island of Ischia (Hummon & Todaro, unpublished data).
Todaro, Balsamo & Tongiorgi, I996 Tetranchyroderma tanymesatherum Hummon,
Giardini Naxos. littoral Todaro, Balsamo & Tongiorgi, 1996
Only one specimen, 458.7 pm long and sexually S. Ambrogio, 2-3 m.
mature, has been found in medium sand. Other than in
Sicily, T. anomalopsum is present in Marches, Abruzzi, Few specimens were collected in fine sand. Tetran-
Apulia and Friuli where it is only reported from fine sand. chj~rodermatanymesatherum is known from fine sands
of Liguria, Tuscan archipelago (Capraia), Campania and
Tetranchyroderma heterotzcbulatum Hummon, the island of Ischia.
Todaro & Tongiorgi, 1993 Tetranchyroderma thysanophorum Hummon,
Giardini Naxos. 2-3 m Todaro & Tongiorgi, 1993
This widespread species has been found at the Trappeto, 2-3 m; Giardini Naxos, littoral, 2-3 m ; S. Ambrogio, 2-3
Tuscan archipelago (Elba 2nd Capraia),along the coasts of m; Mongiove, 2-3 m.
Latium and Campania, at the islands of Ponza and Ischia,
along the Ionian coast of Lucania, in Apulia and Friuli. Al1 the individuals from Trappeto and Giardini Naxos
had a body length much shorter than that reported for
Tetranchyroderma hypopsilancrum Hummon, the species, 275-360 vs 460 pm. The species has been
recorded in Tuscany and the Tuscan archipelago (Elba,
Todaro & Tongiorgi, 1993 Giglio and Capraia), in Cmpania and at the island of
Ischia, in Sardinia, and was already known from the
Pozzallo, 1-2 m; Rada di Portopalo, 2-3 m; Giardini Nawos, 2-3 Tyrrhenian coast of Sicily (Cefalù).
m.
The area of distribution of T. hypopsilancrum in- Tetranchyroderma sp.
cludes Tuscany, Latium, Campania, the Adriatic coasts of
Apulia and Veneto. S. Ambrogio, 2-3 m.
