Two new enchytraeid species from Jeju Island, Korea (Annelida, Clitellata)

By

Dozsa-Farkas, Klara
Felfoldi, Tamas
Nagy, Hajnalka
Hong, Yong

Type

Article

Date of Publication

2019

Original Publication

ZooKeys

Volume

824

Pages

87-108

Subjects

Achaeta multisacculata , Enchytraeidae , Fridericia floriformis , molecular analysis , new species

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.824.25544

 

Abstract

The enchytraeid fauna of three areas in Jeju Island (Korea) was studied, and comparative morphological and molecular taxonomic examinations (based on CO1, ITS and H3 sequences) were performed on nine samples collected in 2016. Twenty-two enchytraeid species were recorded and identified. The descriptions of two new species (Achaetamultisacculatasp. n.andFridericiafloriformissp. n.) are presented in this paper. The main diagnostic features ofA.multisacculatasp. n.are: three pairs of pyriform glands per segment, clitellum with two “baguette-like” packages of glands, dorsal blood vessel from VII, secondary pharyngeal glands absent, oesophageal appendages well developed, two pairs of preclitellar nephridia, the reproductive organs (except the spermathecae in V) shifted one segment forward. The main features ofF.floriformissp. n.are that they are large worms, have up to 2–4 chaetae in bundles, strong body wall, thick cuticle, five pairs of preclitellar nephridia, c-type coelomo-mucocytes sometimes with some refractile vesicles, chylus cells in XII–XV, sperm funnels approximately twice as long than wide, spermathecae with long ectal duct without glands, ampullae surrounded distally by about 9–12 sessile diverticula of varying size. Molecular phylogenetic analyses supported the morphological results and confirmed the status of the two new species.