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| Metaphire acampanulata Nguyen, Ly, Lam, Nguyen & Nguyen, 2022 |
Abstract
A new species, Metaphire acampanulata sp. nov., was described from Southern Vietnam. The species belonging to Metaphire houlleti species-group, can be characterized by having three pairs of spermathecal pores in 6/7/8/9, genital markings invisible, first dorsal pore in 11/12 or 12/13, spermatheca mushroom-shaped, ampulla duct L-shaped, and penial setae present. The K2P genetic distance based on a 600 bp fragment of the mitochondrial gene, COI, between the new species and its closely related one, M. houlleti, was 18.8%, and the intraspecific distance between its populations was from 0.3 to 9.8%.
Keywords: Metaphire houlleti, Metaphire cf. campanulata, morphological variations, genetic variations, new species, taxonomy, Southern Vietnam
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| Metaphire acampanulata sp. nov., holotype (CTU-EW.018.h01). A1 and A2.Ventral view of male region. B1 and B2. Left spermathecae. C1 and C2. Intestinal caecum. D1 and D2. Lateral view of spermathecal region. E.Dorsal view of male organs. F1 and F2. Right prostate gland. G. Male pore region transverse body section (CTU-EW.018.p02). Abbreviations: amp, ampulla; ag, accessory gland; dv, diverticulum; mp, male pore; os, ovisacs; ov, ovary; ps, penial seta; sp, spermathecal pore; sv, seminal vesicle; ts, testis sac. Scale bar = 1mm. |
Metaphire acampanulata sp. nov.
Diagnosis: Medium size, length 77–198 mm, diameter 4.03–6.91 mm, number of segments 56–144. Prostomium epilobic. First dorsal pore in11/12 or 12/13. Three pairs of spermathecal pores in 6/7/8/9, ventrolaterally or laterally. Male pore in xviii, copulatory pouches present; ventral distance between openings of the pouches about 0.21–0.37 circumference. Genital markings inconspicuous. Intestinal caeca simple. Septa 8/9/10 absent. Spermathecal ampulla mushroom shaped with longitudinal grooveson the surface, duct L-shaped. More than two stalk accessory glands attach anteriorly and posteriorly to the base of the ampulla duct. Penial setae present. Holandric. Testis sacs connected. Ovisacs paired in 12/13/14.
Etymology: An epithet ‘acampanulata’ is formed by the prefix ‘a’ and ‘campanulata’ to emphasize the wrong name ‘campanulata’ recorded in Vietnam.
Vietnamese name: giun khác campanulata
Tung Thanh Nguyen, Vuong Van Ly, Dang Hai Lam, Thuan Van Nguyen and Anh Duc Nguyen. 2022. A New Earthworm Species of the Genus Metaphire Sims & Easton, 1972 (Oligochaeta: Megascolecidae) from Southern Vietnam. Tropical Natural History. 22(1); 72-84.
