Abstract
Three undescribed species of Heteromastus Eisig, 1887 were collected from intertidal to sublittoral habitats in western and southern waters of Korea. Heteromastus namhaensis sp. nov. is distinguishable from other congeners by the presence of hemispheric notopodial lobes in the posterior abdomen. Heteromastus gusipoensis sp. nov. closely resembles H. tohbaiensis Yabe & Mawatari, 1998 in the absence of posteriorly extended abdominal notopodial lobes, but differs in the absence of eyespots on the prostomium and distinct node on the shaft of thoracic hooks in H. gusipoensis. Heteromastus koreanus sp. nov. is similar to H. filiformis sensu Hutchings & Rainer, 1982 in the shape of abdominal notopodia, but clearly differs in dentition of the abdominal hooks and methylene green staining pattern (MGSP). DNA sequences (mtCOI and histone H3) of these new Korean species were compared with all sequences of Heteromastus species available in the public database. Molecular results showed distinct genetic differences among these three new Korean species at species level. Comparison of mtCOI gene revealed significant genetic difference between H. filiformis and these Korean species. A comprehensive comparison between three Heteromastus species of present study and their closely related congeners is conducted based on morphological and genetic results.
Highlights
The genus Heteromastus Eisig, 1887, which belongs to the family Capitellidae Grube, 1862, is commonly found from intertidal areas to shallow subtidal depths in a variety of sediment types, including fine and silty sand and mud (Blake 2000; Dean 2001)
The genus Heteromastus was first designated by Eisig (1887) based on the description of H. filiformis Claparède, 1864 from southern France
Methyl green staining patterns (MGSP) and scanning electron microscopy (SEM) analyses were performed as delineated by Jeong et al (2017b)
Summary
The genus Heteromastus Eisig, 1887, which belongs to the family Capitellidae Grube, 1862, is commonly found from intertidal areas to shallow subtidal depths in a variety of sediment types, including fine and silty sand and mud (Blake 2000; Dean 2001). The genus Heteromastus was first designated by Eisig (1887) based on the description of H. filiformis Claparède, 1864 (as Capitella filiformis) from southern France. According to his diagnosis, Heteromastus is distinguished from other genera in the family by having 11 thoracic chaetigers, of which the first five only have capillaries. Heteromastus currently contains seven valid species (Read and Fauchald 2018), the chaetal arrangement of H. giganteus Zachs, 1933 does not match to the original generic definition (Zachs 1933). The thoracic chaetal arrangement varies depending on the degree of development (Fredette 1982)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
