TABLE 7. Comparison of characters of species of Trematosoma after original descriptions and additional references. Unique characters marked in bold. Abbreviations: -, information about character not available; +, character present; [], information from additional reference(s).?, character appeared questionable or unclear in our interpretation; SEM, scanning electron microscopy.

Species	T.	T. bocqueti	T. complatana	T. constricta (Collin,	T. falcata	T. ovata	T. pusilla	T. rotunda (Allgén,	T. husselae sp.
Character	amphiasci	(Guilcher, 1950)	(Gruber, 1884)	1909)	(Jankowski,	(Pritchard,	(Maupas,	1951)	nov.
	(Precht,				1981)	1852)	1881)
	1935)
Arrangement	one row left	one row left and	one row left	one row left and	one row left	single row,	single row,	ca. 12–19 tentacles	one row left
of tentacles	and right	right with 18–20	and right with	right with small gap;	and right with	ca. 11	4–5 tentacles	in one? row	and right with
	with ca. 9	tentacles each,	ca. 10 tentacles	[and 11–14 or 8–28	5–6 tentacles				8–16 tentacles
	tentacles	small gap; [2	occurring also	tentacles]	each, small				each, small gap
	each, small	short and 2 or	laterally, broad		gap
	gap	3 long tentacles	gap
		at each corner
		of lorica, broad
		gap]
Length of	short; [11–	-; [11–12 µm or	-; [50 µm]	long; [30–69 µm;	very short	-	short; [10	4–6 µm; [4 µm]	4–6 µm
tentacles	12 µm, thick	48–50 µm]		17–31 µm]			µm]
	and 48–50
	µm, thin]
Endogenous	not observed	+, embryo 25	not observed yet	+	not observed	not	+	not observed yet	+, embryo
budding	yet	µm x 10 µm			yet	observed yet			13–15 µm x
									8–10 µm
Original	Copepoda	Copepoda; [on	-; [Hydrozoa;	Crustacea: Paguridae	green algae	Hydrozoa	Bryozoa;	Nematoda	Kinorhyncha
basibiont;		debris]	Bryozoa]				[algae;
[additional							Hydrozoa;
basibionts]							tubes of
							Polychaeta;
							Copepoda]
Original	Baltic Sea:	English	Ligurian Sea:	English Channel:	Arctic Ocean,	North Sea:	Algeria:	Falkland Islands;	North Sea: Sylt
location(s);	Kiel Bight;	Channel:	Genua	Roscoff;	Murmansk	United	Algier;	[India, Sundarbans]
[additional	[Adriatic	Roscoff;		Mediterranean Sea:		Kingdom	[Adriatic
location]	Sea]	[Western		Banyul			Sea]
		Australia]
Remarks,	Fernandez-	Batisse 1972;	Collin 1912;	original description		described	Curds 1985;	Curds 1985:	this paper
additional	Leborans et	Post et al. 1983	Curds 1985	brief, illustration		without	Fernandez-	Acineta ovoidea
references	al. 2012			and more detailed		name by	Leborans et	Allgén, 1951 =
				description in Collin		Alder 1851;	al. 2012	synonym of T.
				1912; Fernandez-		Curds 1985		rotunda, because
				Leborans & Gabilondo				just lateral view;
				2006; Fernandez-				Ghosh & Mandal
				Leborans et al. 2013				2019