Cirriformia cf. tentaculata ( Montagu, 1808 )

Jimi, Naoto, Fujiwara, Yoshihiro & Kajihara, Hiroshi, 2024, Evaluation of “ Cirriformia tentaculata ” (Annelida: Cirratulidae) from Japan as a Pollution Indicator in Marine Environments: Is it Truly a Single Species?, Species Diversity 29 (2), pp. 281-316 : 308-310

Cirriformia cf. tentaculata ( Montagu, 1808) var. B ( Figs 37–39 )

Material examined. Isotake: one of unknown sex, body length 44 mm, body width 2 mm, 219 chaetigers, 19 June 2014, coll. N. Jimi. NSMT-Pol-113576, COI INSD accession no. PP891573.

Koura: one of unknown sex, body length 69 mm, body width 3 mm, 210 chaetigers, 6 June 2014, coll . N . Jimi. NSMT-Pol-113577, COI INSD accession no. PP891583.

Mase: one of unknown sex, body length 22 mm, body width 1 mm, 171 chaetigers, 7 June 2014, coll . N . Jimi. NSMT-Pol-113578, COI INSD accession no. PP891587.

Motoshima: one of unknown sex, body length 31 mm, body width 2 mm, 209 chaetigers, 28 June 2014, coll . N . Jimi. NSMT-Pol-113579, COI INSD accession no. PP891589.

Toyohama: one of unknown sex, body length 81 mm, body width 3 mm, 283 chaetigers, 3 June 2014, coll . N . Jimi. NSMT-Pol-113580, COI INSD accession no. PP891603.

Description. Body length 22–81 mm and width 1–3 mm, 171–283 chaetigers, and color in life orange. Color in alcohol pale yellow ( Fig. 37A ). Several specimens with black pigmentation in anterior ventral zone. Body elongat- ed, dorsally inflated and grooved throughout, ventral surface not grooved. Eyes absent. Prostomium broad triangular ( Fig. 38). Paired nuchal organs located on prostomium. Peristomium with one annulation and some wrinkles, deeply grooved in junction between peristomium and chaetiger 1. Branchiae start from chaetiger 1, one pair per segment. Branchiae arising from notopodial ridge, in posterior segments, inserted at discrete distance from notopodial ridge, not shifting to mid-dorsal section. Notopodia and neuropodia well separated, forming shoulders shifting from a position closer to dorsum to a more median position along midbody. Two groups of dorsal tentacles arising from chaetigers 4–5 (<22 mm), 5–6 (≥ 22 and <69 mm length), 6–7 (> 69 mm length); each group with 8–19 tentacles. Dorsal tentacles organized in two groups each. Notopodia and neuropodia with capillary chaetae and spines. Notochaeta: 1–12 capillary chaetae per fascicle along entire body, 2–4 spines ( Fig. 39A ) present from chaetigers 52–114 and following chaetigers, spines short, slightly curved, blunt. Neurochaeta: 1–14 capillary chaetae per fascicle along entire body, 2–5 spines ( Fig. 39B ) present from chaetigers 23–48 and following chaetigers, spines short, slightly curved, blunt. Pygidium simple, with terminal anus.

310 Naoto Jimi et al.

Methyl Green Staining Pattern. It was coincident with the pattern of C. cf. tentaculata var. A ( Fig. 37B, C ).

Distribution and habitat. Known from shallow area of rocky beach (~ 2m) around Japan.

Remarks. See remarks of C. cf. tentaculata var. A.

Comparison of each species habitat

The data of habitat information are showed in Table 4. ORP, grain size, salinity, and pH showed significant difference by ANOVA between some species (P <0.05; Fig. 40 ). After ANOVA, we conducted Tukey’s test. It showed significant differences between C. satoi vs. C. okudai , C. cf. tentaculata var. A, and C. cf. tentaculata var. B in pH (P <0.05; Fig. 41A ), and between C. satoi vs. C. okudai , C. cf. tentaculata var. A, and C. cf. tentaculata var. B; as well as between C. petersenae vs. C. okudai in ORP (P <0.05; Fig. 41B ).

Figures

Fig. 37. Stereoscopic micrographs of Cirriformia cf. tentaculata var. B (NSMT-Pol-113580). A, Whole body of preserved specimen; B, MGST pattern of prostomium; C, MGST pattern of lateral body.

Fig. 39. Scanning electron micrographs of Cirriformia cf. tentaculata var. B (NSMT-Pol-113580). A, Neuropodial spines; B, notopodial spines.

Fig. 40. Box plot of environmental information of Cirriformia satoi, C. petersenae, C. okudai, C. cf. tentaculata var. A, and C. cf. tentaculata var. B distribution, showing water information (A–D) and sediment information (E–H). A, DO (mg/L); B, ORP (mV); C, pH; D, salinity (%); E, temperature (°C); F, grain size (µm); G, IL (%); H, ORP (mV). The vertical lines of the box plots represent the maximum value within 1.5 times the interquartile range (IQR) above the third quartile and the minimum value within 1.5 times the IQR below the first quartile. Abbreviations: varA, C. cf. tentaculata var. A; varB, C. cf. tentaculata var. B.

Fig. 41. Result of Tukey’s test-95% family-wise confidence level of pH (A) and ORP (B) between the five species of Cirriformia. Abbreviations: o, C. okudai; p, C. petersenae; s, C. satoi; vA, C. cf. tentaculata var.A; vB, C. cf.tentaculata var. B.