Echinoderes lanceolatus Chang & Song, 2002

Sørensen, Martin V., Goetz, Freya E., Herranz, María, Chang, Cheon Young, Chatterjee, Tapas, Durucan, Furkan, Neves, Ricardo C., Yildiz, N. Özlem, Norenburg, Jon & Yamasaki, Hiroshi, 2020, Description, redescription and revision of sixteen putatively closely related species of Echinoderes (Kinorhyncha: Cyclorhagida), with the proposition of a new species group - the Echinoderes dujardinii group, European Journal of Taxonomy 730, pp. 1-101 : 54-55

Echinoderes lanceolatus Chang & Song, 2002

Fig. 18

Material examined

Holotype

REPUBLIC OF KOREA • ♀; Jeju Island , Boemseom Islet ; 33°11′53″ N, 126°30′58″ E; 25 m b.s.l.; 3 Mar. 2000; J. Lee and Y.H. Song leg.; muddy sand; EWNHM60268 . Specimen mounted for LM.

Additional material

Additional examined material included all specimens listed as “additional material examined” in Chang & Song (2002: 206). This material was collected from other islands in the Korean East Sea, along the south coast of the Korean Peninsula, and around Jeju Island (see further details in Table 1 and below under description of Echinoderes songae Sørensen & Chang sp. nov.).

Morphological notes on female holotype

Specimen with slender middorsal spines on segments 4 to 8, and lateroventral spines on segments 6 to 9; middorsal spine on segment 6 reaches posterior segment margin, whereas middorsal spines on segments 7 and 8 reach well beyond their respective posterior margins ( Fig. 18B ). Tubes present in ventrolateral positions on segment 2 ( Fig. 18D ) and lateroventral positions on 5, and in midlateral positions on 10. An incomplete midventral, intracuticular fissure is present on anterior half of segment 2 ( Fig. 18D ). Complete overview of glandular cell outlets type 1 distribution could not be obtained, but we see indications of paradorsal outlets on segment 6. Glandular cell outlets type 2 are not present on any segment ( Fig. 18E ). Female lateral terminal accessory spines are short, with stout bases. Female papillae were difficult to examine, but indications of ventrolateral papillae with a tubular substructure were observed on segment 7 ( Fig. 18C ). All characters that could be observed fit the emended diagnosis of E. aureus , which suggest that E. lanceolatus is a junior synonym of this species.

Morphological notes on additional material

All examined paratypes and non-types supposed to represent the morphology of E. lanceolatus were similar, but differed from the holotype of E. lanceolatus . The specimens have short middorsal spines on segments 4 to 8, and lateroventral spines on segments 6 to 9; middorsal spines never reach the pectinate fringes of the posterior margins of their segments – not even middorsal spines on more posterior segments. Tubes are present in lateroventral positions on segments 2 and 5, and in laterodorsal positions on 10. Minute glandular cell outlets type 2 are present in laterodorsal positions on segments 8, but lacking on segment 9. Tergal extensions of segment 11 are short, pointed and well-spaced, whereas sternal extensions are short and triangular, but not as pointed as the tergal ones. Seta-like, ventrolateral tufts of extended fringe tips project from the sternal extensions. Females have slender lateral terminal accessory spines, and female papillae with tubular intracuticular substructure in ventrolateral positions on segments 7 and in ventromedial positions on segment 8. These traits suggest that the specimens are not conspecific with the holotype of E. lanceolatus , but represent a new species (see following description of E. songae Sørensen & Chang sp. nov.).

Figures

Fig. 18. Light micrographs showing overviews and details of Echinoderes lanceolatus Chang & Song, 2002, holotype, ♀ (EWNHM60268), species now junior synonym of Echinoderes aureus Adrianov et al., 2002. A. Ventral overview. B. Segments 7 to 10, dorsal view. C. Segments 6 to 11, ventral view. D. Segments 1 to 4, ventral view. E. Details showing laterodorsal and midlateral parts of segments 8 and 9, documenting the absence of glandular cell outlet type 2.