Ampharete villenai

Ampharete villenai   Parapar, Helgason, Jirkov & Moreira, 2012

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Classification / Names Common names | Synonyms | CoL | ITIS | WoRMS

Polychaeta | Terebellida | Ampharetidae

Environment: milieu / climate zone / depth range / distribution range Ecology

Benthic.  Polar

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions

Northeast Atlantic: Iceland.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?  range ? - ? cm

Short description Morphology

Body short; longest complete specimen (holotype) 12 mm long and 1.0 mm wide. Thorax thicker than abdomen, of about the same length; abdomen of nearly constant width throughout. No eyespots observed. Buccal tentacles with papillae. Four pairs of long branchiae arranged in two groups very close to each other; first three branchiae of each group in a transverse anterior row and the fourth one in a posterior position. Between 13 and 19 short, thick and flat paleae on each side (18 in holotype) gradually but quickly tapering to long filiform tips. Fourteen thoracic chaetigers with well-developed notopodia; the posterior twelve also with neuropodia and uncini. First two thoracic chaetigers with less developed notopodia. Notochaetae forming two rows; slightly flattened with a narrow brim, covered with scales and tapering into slender tips. Thoracic uncini with two vertical rows of 4-6 teeth each above rostrum. Twelve abdominal segments, with decreasing length towards the end; first two abdominal segments with neuropodia of thoracic type. Abdominal uncini with three horizontal rows of 6-8 teeth each above rostrum. Pygidium with a pair of short lateral lobes. Colour in alcohol pale yellow. No tubes observed. In holotype, oocytes visible in body cavity.

Biology     Glossary (e.g. epibenthic)

A surface deposit feeder (Ref. 96435).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Members of the class Polychaeta are mostly gonochoric (sexual). Mating: Females produce a pheromone attracting and signalling the males to shed sperm which in turn stimulates females to shed eggs, this behavior is known as swarming. Gametes are spawned through the metanephridia or body wall rupturing (termed as "epitoky", wherein a pelagic, reproductive individual, "epitoke", is formed from a benthic, nonreproductive individual, "atoke"). After fertilization, most eggs become planktonic; although some are retained in the worm tubes or burrowed in jelly masses attached to the tubes (egg brooders). Life Cycle: Eggs develop into trocophore larva, which later metamorph into juvenile stage (body lengthened), and later develop into adults.

Main reference References | Coordinator | Collaborators

Parapar, J., G.V. Helgason, I. Jirkov and J. Moreira 2012 Polychaetes of the genus Ampharete (Polychaeta: Ampharetidae) collected in Icelandic waters during the BIOICE project. Helgoland Marine Research 66(3):331-344. (Ref. 96435)

IUCN Red List Status (Ref. 130435: Version 2025-1)

  Not Evaluated 

CITES status (Ref. 108899)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless

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