The megascolecid earthworms (Annelida, Oligochaeta, Megascolecidae) in the Phu Quoc island, Vietnam, with descriptions of three new species

Abstract

The megascolecid earthworms of the Phu Quoc island are intensively investigated. Twelve species in three genera (Lampito Kinberg, 1867, Amynthas Kinberg, 1867, and Metaphire Sims & Easton, 1972) are recorded. Of these, Metaphire doiphamon Bantaowong & Panha, 2016 is recorded for the first time in Vietnam, and three species are newly described, namely Amynthas catenatussp. nov., A. phuquocensissp. nov., and A. poropapillatussp. nov. An identification key to 12 megascolecid species is provided as well.

Notes on the earthworm species, Metaphire anomala (Michaelsen, 1907) (Clitellata, Megascolecidae) in Southern Vietnam, with descriptions of two new species

“…The new species has been previously identified as Metaphire anomala. It is widely distributed in Southern Vietnam (Thai et al 2004;Nguyen 2014;Nguyen et al 2017aNguyen et al , 2017bNguyen et al , 2019Nguyen et al , 2020. However, this species is very different from both the original description (Michaelsen 1907), and re-description of M. anomala from Myanmar (Gates 1925(Gates , 1972, Thailand (Bantaowong et al 2011) in the position of male pores, number and position of spermathecal pores, genital markings in male and spermathecal regions and body size.…”

“…For example, earthworms on islands still have been poorly recognised, except some data in Nam Du (Michaelsen 1934), Con Son (Thai et al 2004), Lai Son, Hon Tre, Nam Du and Phu Quoc (Nguyen et al 2017a(Nguyen et al , 2020. Several species were also recently described from Lai Son Island and Phu Quoc Island (Nguyen et al 2017a(Nguyen et al , 2020. It is thus suggested that more intensive surveys in islands of Vietnam would bring more new taxa to discovery.…”

“…), Dong Nai (Cat Tien), Kien Giang (Lai Son Isl., Phu Quoc Isl. ), An Giang (Nhon Mts, Phu Cuong Mts, Ba Doi Mts, Cam Mts, To Mts), Dong Nai (Vinh Cuu, Xuan Loc, Dinh Quan, Trang Bom, Cam My, Long Thanh, Cat Tien NP), Tay Ninh (Ba Den Mts) (Thai et al 2004;Nguyen 2014;Nguyen et al 2016Nguyen et al , 2017aNguyen et al , 2017bNguyen et al , 2019Nguyen et al , 2020.…”

Reproductive damage and compensation of wild earthworm Metaphire californica from contaminated fields with long-term heavy metal exposure

“…J o u r n a l P r e -p r o o f 9 Depurated M.californica was fixed with pins on a smooth foam and two pairs of spermathecal pores were located in the 7th to 9th lateroventral intersegment (Nguyen et al, 2020;Xu and Xiao, 2010). Dissected and gently tore the septa along the abdominal midline of worms from anterior to clitellum segments, separated out the seminal vesicles, then rinsed with ultrapure water to remove adhering mucus, finally fixed in 10% formaldehyde solution for 48h.…”