Cirriformia saxicola Jimi, Fujiwara & Kajihara, 2024, sp. nov.
Creators: name: Jimi, Naoto
name: Fujiwara, Yoshihiro
name: Kajihara, Hiroshi
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Terebellida
Cirratulidae
Cirriformia
Cirriformia saxicola

description: Cirriformia saxicola sp. nov.
[New Japanese name: Iwa-mizuhiki] (Figs 7–9)
Material examined. Torinosu: one of unknown sex, body length 31 mm, body width 1 mm, 166 chaetigers, 27 June 2014, coll. N. Jimi. Paratype (NSMT-Pol P-931), COI INSD accession no. PP891601.
Toyohama: one of unknown sex, body length 18 mm, body width 1 mm, 144 chaetigers, 3 June 2014, coll. N. Jimi. Holotype (NSMT-Pol H-932), COI INSD accession no. PP891602
Description. Body length 18–31 mm and width 1.0 mm, 144–166 chaetigers, and color in life orange. Color in alcohol pale yellow (Fig. 7A). Holotype and paratype specimens with black pigmentation in anterior ventral zone. Body elongated, dorsally inflated and grooved throughout, ventral surface not grooved. Eyes absent. Prostomium broad triangular (Fig. 8). Paired nuchal organs located on prostomium. Peristomium with two annulations with 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, not shifting to mid-dorsal section. Notopodia and neuropodia separated, forming shoulders present at median position along whole body. Two groups of dorsal tentacles arising from chaetigers 5–6; each group with 10–17 tentacles. Dorsal tentacles organized in two groups each. Notopodia and neuropodia with capillary chaetae and spines. Notochaeta: 2–7 capillary chaetae per fascicle along entire body, 3–6 spines (Fig. 9A) present from chaetigers 43–46 and following chaetigers, spines short, slightly curved, blunt. Neurochaeta: 3–10 capillary chaetae per fascicle along entire body, 2–5 spines (Fig. 9B) present from chaetigers 28–35 and following chaetigers, spines short, slightly curved, blunt. Pygidium simple, with terminal anus.
Methyl Green Staining Pattern. The tip and posterior margin of prostomium was notably stained. Segment after tentacles were stained forming complete rings around segments, inter-segmental grooves not staining (Fig. 7B, C).
Etymology. The specific name is a compound noun in apposition (saxum + colo + -a) after habitats of the type specimens (a chink in rocks).
Distribution and habitat. Known from a chink in a rock collected from shallow area (~ 3 m) of Pacific Ocean side of Japan.
Remarks. This species resembles C. moorei Blake, 1996, C. pygdia (Treadwell, 1936) and C. capixabensis Magalhães, Seixas, Paiva, and Elias, 2014 in dorsal tentacles arising from chaetigers 5–6. The species can be discriminated by spine of neuropodia start from chaetigers 28–35, whereas C. moorei start from about chaetiger 85. Cirriformia capixabensis have many neuropodial spines (5–6), whereas C. saxicola has few spines (2–5). Also, C. pygdia does not have hooks in notopodia.
description: Published as part of 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?, pp. 281-316 in Species Diversity 29 (2) on pages 286-287, DOI: 10.12782/specdiv.29.281, http://zenodo.org/record/14669708