New insights on the taxonomy of <i>Diadumene paranaensis</i> (Cnidaria: Actiniaria) associated with mangrove roots in the Brazilian semi-arid coast

MELO, YAGO A. DE; ARAÚJO, MAYANE R. DE; MAIA, RAFAELA C.; GOMES, PAULA B.

doi:10.1590/0001-3765202420230101

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ANIMAL SCIENCE • An. Acad. Bras. Ciênc. 96 (3) • 2024 • https://doi.org/10.1590/0001-3765202420230101 copy

New insights on the taxonomy of Diadumene paranaensis (Cnidaria: Actiniaria) associated with mangrove roots in the Brazilian semi-arid coast

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

A dense estuarine aggregation of Diadumene paranaensis Beneti, Stampar, Maronna, Morandini & Da Silveira, 2015 associated with Rhizophora mangle L. was found at the Arpoeiras Beach, mouth of Acaraú River, Ceará, Brazilian semi-arid coast. Here, we compare biological and taxonomical traits with the type material, collected from the portuary zone of Paranaguá Bay, and propose modifications in the diagnosis of the species, as well as of the family Diadumenidae and genus Diadumene, to align with the description of our specimens. In addition, we discuss its tolerance to high salinity and predict a much broader geographic range for this sea anemone in Brazil.

Key words
Diadumene; estuary; nematocyst; new occurrence; Northeast Brazil; sea anemone

	Categories	Length x width (µm)	M± SD	N	F	Length x width (µm)	M± SD
	D. paranaensis (this study)					D. paranaensis (Beneti et al. 2015BENETI JS, STAMPAR SN, MARONNA MM, MORANDINI AC & DA SILVEIRA FL. 2015. A new species of Diadumene (Actiniaria: Diadumenidae) from the subtropical coast of Brazil. Zootaxa 4021 (1): 56-168.)
COLUMN*	(A) Basitrichs I	14.23–19.45 x 2.33–3.43	17.09±1.32 x 2.83±0.32	30	+	9.6–13.5 x 1.2–2.4	10.85±1.38 x 2.04±0.53
	(B) Basitrich II	21.21–25.93 x 5.21–8.17	23.6±1.27 x 6.68±0.93	30	++	15.2–20.7 x 2.4–4.2	18.14±1.22 x 3.04±0.34
	(C) p- mastigophores B2a	18.05–26.8 x 3.2–4.41	21.31±2.37 x 3.67±0.41	30	+	9.9–15.6 x 3.0–4.8	12.78±1.65 x 4.05±0.53
TENTACLES	(D) Spirocysts	21.15–31.31 x 4.03–6.61	26.69±3.2 x 5.31±0.73	30	+++	10.28–17.85 x 2.65–4.72	14.54±2.89 x 3.28±1.01
	(E) Holotrichs I	21.76–24.62 x 5.01–5.55	22.78±0.93 x 5.26±0.19	10	+	25.8–34.2 x 7.2–11.4	31.02±2.14 x 9.94±1.09
	(F) Holotrichs II	38.23–50.91 x 12.33–16.14	44.28±4.45 x 14.27±1.19	30	+++	21.6–27.6 x 4.8–7.2	25.34±2.01 x 6.16±0.76
	(G) Basitrichs	15.96–23.78 x 2.45–3.04	19.53±2.34 x 2.84±0.16	30	++	7.2–21.2 x 1.2–3.6	14.03±2.72 x 2.33±0.44
	(H) p- mastigophores B2a	30.67–40.6 x 5.28–8.1	35.75±2.85 x 6.64±0.82	30	+++	19.8–26.4 x 3.6–6.0	22.75±1,58 x 4.68±0.58
	(I) p- mastigophores B2b	50.34–54.21 x 9.78–10.43	52.51±1.62 x 10.12±0.23	10	+	36.0–46.2 x 6.0–8.4	41.01±2.46 x 7.29±0.66
ACTINOPHARYNX	(J) Basitrichs	21.56–30.25 x 3.35–4.6	26.51±2.31 x 3.96±0.5	30	+++	16.8–21.28 x 1.2–3.7	19.67±1.07 x 2.67±0.71
ACTINOPHARYNX	(K) p- mastigophores B2a	18.05–26.8 x 3.2–4.41	21.31±2.37 x 3.67±0.41	30	++	15–22.8 x 3–4.2	17.84±1.65 x 3.64±0.35
FILAMENT	(L) Basitrics	11.9–16.98 x 1.65–2.45	13.66±1.19 x 2.21±0.21	30	++	10.8–19.2 x 1.2–3.0	15.50±2.19 x1.86±0.51
	(M) p- mastigophores B1	12.04–15.88 x 5.2–7.77	13.99 ± 1.16 x 6.74±0.62	30	++	12.0–22.8 x 3.0–4.8	16.16±2.33 x 3.77±0.43
	(N) p- mastigophores B2a I	22.54–26.99 x 4.3–5.26	25.31±1.17 x 4.67±0.37	30	++	7.2–12.9 x 2.8–4.8	11.20±2.09 x 4.06±0.78
	(O) p- mastigophores B2a II	38.45–49.08 x 6.01–7.53	44.4±3.49 x 6.52±0.46	30	++	39.0–51.6 x 6.0–8.4	46.46±1.28 x 7.07±0.51
ACONTIA**	(P) Basitrichs	17.0–20.64 x 2.28–3.22	19.02±0.99 x 2.76±0.32	30	+++	10.2–19.2 x 1.2–3.6	15.50±2.01 x 1.96±0.52
	(Q) (N) p- mastigophores B2a I	20.56–25.97 x 4.4–5.98	22.93±2.0 x 5.07±0.56	10	+	19.2–26.4 x 3.0–6.0	22.42±2.71 x 4.42±0.82
	(R) (N) p- mastigophores B2a II	48.66–58.65 x 12.7–14.69	54.34±3.49 x 13.82±0.74	30	+++	35.9–57.5 x 5.1–7.4 41.1–57.0 x 5.4–8.4	43.61±4.17 x 6.07±0.64 46.59±3.34 x 6.56±0.78

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[1] Correspondence to: Yago Araújo de Melo E-mail: yagomelo809@gmail.com