Chaetozone

• Main Author: Lavesque, Nicolas
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Cirratulidae; Chaetozone; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.6049831; http://treatment.plazi.org/id/03D087E0FFBDFFEB249DF95CFA0E8040

Key to 12 Chaetozone species from the North Atlantic Ocean (Note: Recent published descriptions of Chaetozone caputesocis and C. zetlandica do not fully agree with the definition of Chaetozone and are not included in the following key; MG = Methyl Green). 1 Anterior body with distinctly enlarged fusiform segments anterior to abdominal segments.2 - Anterior body segments only slightly enlarged, gradually tapering posteriorly.3 2 Anterior body segments enlarged dorsally into hump-backed configuration; peristomium not divided into rings, dorsal tentacles arising from posterior margin of peristomium; posterior parapodia with partial cinctures, up to 8 spines on a side; MG pattern not tested. C. gibber - Anterior segments enlarged forming distinct fusiform shape; peristomium with two distinct rings, dorsal tentacles arising from smaller second peristomial ring; posterior parapodia with complete cinctures, up to 16 spines on a side; elaborate MG staining pattern throughout body. C. elakata n. sp . 3 First complete body segment asetigerous; first branchiae on asetigerous segment; eyes absent; long natatory-like capillaries present or absent. 4 - First complete body segment setigerous; first branchiae either on posterior margin of peristomium or setiger 1; eyes present or absent; long natatory-like capillaries absent.7 4 Peristomium with dorsal crest; dorsal tentacles in notch between peristomium and setiger 1; long natatory-like setae on all segments from setigers 18–21; deep groove present along venter; MG stains peristomial area, stripes on anterior thoracic segments, and posterior cinctured segment. C. setosa - Peristomium without dorsal crest; dorsal tentacles arising from posterior margin of peristomium; long natatory setae present or absent; ventral groove present or absent; MG pattern present or absent.5 5 Body pigmented; neuropodial spines first present from anterior one-third of body (setigers 5–25 in 80-setiger specimens); long natatory-like capillaries present on sexually matures specimens or absent; MG ...