The occurrence of two morphologically similar Chaetozone (Annelida: Polychaeta: Cirratulidae) species from the Italian seas: Chaetozone corona Berkeley & Berkeley, 1941 and C. carpenteri McIntosh, 1911

Figures & data

Figure 1. Map of the study area and location of sampling stations (St.).

Table I. Details, water parameters at the bottom, TOC (total organic carbon) concentrations in sediment and sediment granulometric composition of the stations where specimens of Chaetozone corona Berkeley & Berkeley, 1941 and C. carpenteri McIntosh, 1911 were recorded in the Central Adriatic Sea and Tyrrhenian Sea. n.e. = not examined.

Station	Bottom	Latitude	Longitude	Depth (m)	Sediment	Temp (°C, min–max)	Salinity (PSU, min–max)	TOC (%)	C. corona	C. carpenteri
St. 5	Soft	42°28ʹ20.781ʹ’N	14°17ʹ11.164ʹ’E	16.5	Silty sand	16.2–18.4	36.2–17.1	0.11		*
St. 7	Soft	42°28ʹ44.146ʹ’N	14°17ʹ56.393ʹ’E	19.5	Silty sand–sandy silt	16.3–18.1	36.4–37.2	0.55	*
St. 8	Soft	42°28ʹ41.728ʹ’N	14°17ʹ59.365ʹ’E	19.5	Sandy silt	16.3–18.1	36.4–37.2	n.e.	*
St. 11	Soft	42°29ʹ14.577ʹ’N	14°20ʹ07.535ʹ’E	27.5	Silt–clayey silt	16.4–17.2	36.5–37.4	0.46	*	*
St. 12	Soft	42°29ʹ11.468ʹ’N	14°20ʹ09.131ʹ’E	27.5	Silt–clayey silt	16.4–17.2	36.5–37.4	n.e.	*	*
St. 13	Soft	42°29ʹ05.938ʹ’N	14°22ʹ37.297ʹ’E	47.5	Silt–clayey silt	13.1–16.8	37.8–38.1	n.e.		*
St. 14	Soft	42°29ʹ02.623ʹ’N	14°22ʹ37.978ʹ’E	46	Silt–clayey silt	13.1–16.8	37.8–38.1	0.76	*	*
St. 15	Soft	42°28ʹ48.445ʹ’N	14°26ʹ13.989ʹ’E	70	Silt–silty clay	13.1–17	38.4–38.5	0.51		*
St. 16	Soft	42°28ʹ45.206ʹ’N	14°26ʹ13.719ʹ’E	70	Clayey silt–silty clay	13.1–17	38.4–38.5	n.e.	*	*
St. 17	Soft	42°28ʹ30.81ʹ’N	14°29ʹ50.979ʹ’E	83	Silty clay	13.1–16.8	38.5	n.e.		*
St. 18	Soft	42°28ʹ27.571ʹ’N	14°29ʹ50.706ʹ’E	83	Silt–silty clay	13.1–16.8	38.5	0.87	*	*
St. 19	Soft	42°28ʹ13.045ʹ’N	14°33ʹ28.13ʹ’E	92	Silt–clayey silt	12.9–16.9	38.4–38.5	0.93		*
St. 20	Soft	42°28ʹ09.807ʹ’N	14°33ʹ27.853ʹ’E	92	Silt–clayey silt	12.9–16.9	38.4–38.5	n.e.		*
St. 21	Soft	42°27ʹ55.097ʹ’N	14°37ʹ06.082ʹ’E	100.5	Silt–clayey silt	12.9–16.8	38.4–38.5	0.1		*
St. 22	Soft	42°27ʹ51.858ʹ’N	14°37ʹ05.802ʹ’E	100.5	Silt–clayey silt–silty clay	13.1–16.8	38.4–38.5	n.e.	*	*
St. 30	Soft	42°20ʹ58.645ʹ’N	15°46ʹ05.681ʹ’N	130	Clayey silt	13.1–14.6	38.4–38.7	0.33		*
St. CA20	Hard	43°28ʹ10.37ʹ’N	10°19ʹ50.06ʹ’E	20	Rock	21	38	n.e.	*

*Indication of the presence of C. corona and C. carpenteri in the sampling stations.

Figure 2. Chaetozone corona. (a) Dorsal view, anterior end, with dorsal tentacle (dt) and branchiae (br). (b) Dorsal view of the notopodia showing spines and capillary chaetae, middle part of the body. (c) Posterior part of the body and pygidium, dorso-lateral view. Scale bars: a = 100 µm; b = 30 µm; c = 20 µm.

Figure 3. Occurrence of Chaetozone corona Berkeley & Berkeley, 1941 and C. carpenteri McIntosh, 1911 in the Central Adriatic Sea: densities (average individuals m⁻²) ± standard error.

Figure 4. Chaetozone carpenteri. (a) Dorsal view of prostomium showing eyes and black speckles, anterior end. (b) Lateral view of awl-shaped capillary (ac) chaetae and large spines (sp), anterior end. (c) Detail of large spine. (d) Detail of damaged chaetae of first chaetigers. (e) Lateral view of long spines (ls) and short capillaries (sc), posterior end. Scale bars: a = 0.5 mm; b = 20 µm; c = 10 µm; d = 2 µm; ee = 100 µm.

Berkeley E , Berkeley C . 1941. On a collection of Polychaeta from southern California. Bulletin of the Southern California Academy of Sciences 40:16–60.

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McIntosh WC . 1911. Notes from the Gatty Marine Laboratory, St Andrews. No. XXXII. Annals and Magazine of Natural History 8:145–173.

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