Amynthas exiguus subsp. exiguus exiguus (Gates 1930
Creators: name: Nguyen, Tung T.
name: Trinh, Kim-Binh T.
name: Nguyen, Hong-Lan T.
name: Nguyen, Anh D.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Opisthopora
Megascolecidae
Amynthas
Amynthas exiguus
Amynthas exiguus exiguus (gates, 1930)

description: <i>Amynthas exiguus exiguus</i> (Gates, 1930) (Figure 5) <i>Pheretima exigua</i> Gates, 1930: 310; Gates 1939: 89. <i>Pheretima exigua exigua</i> – Gates 1972: 184. <i>Amynthas exiguus exiguus –</i> Sims &amp; Easton 1972: 235. <i>Material examined</i> 31 matures (CTU-EW 094.01) Hon Tre Island (09°58 <i>ʹ</i> 13.0 <i>ʹʹ</i> N, 104°51 <i>ʹ</i> 15.5 <i>ʹʹ</i> E), Kien Hai District, Kien Giang Province, 13 November 2013, coll. Kim-Binh T. Trinh. <i>Diagnosis</i> Small size, length 40–69 mm, diameter 2.3–3.0 mm, 65–93 segments. Prostomium 1/2 epilobous. First dorsal pore in 12/13. Setal number 32–42 in viii, 40–47 in xxx, 8–15 between male porophores in xviii; setal distance aa = 2.0 ab, zz = 2.0 zy. Four pairs of spermathecal pores in 5/6/7/8/9. Male pores located in xviii, without copulatory pouches. Genital markings present, but variable in the spermathecal and male regions. Testis sacs separated. Holandric. Intestinal caeca simple, short, xxvii–xxv. Septa 8/9/10 absent. <i>Habitats</i> The species was found in clay soils on hill slopes, and sometime in soils inside rocky hollows. It was usually collected from fruit plantations. <i>Remarks</i> A total of 31 specimens were examined to show the variation in the number and position of genital markings in spermathecal and male regions. Genital markings are variable in front of setal rings in xvii, xviii, xix and xx, but the most common pattern is three pairs in xvii, xviii and xix (13 of 31 specimens). They are also variable from one to three pairs in front of setal rings in viii, ix and x. <i>Distribution</i> The species is widely known from Vietnam (Lao Cai, Son La, Ninh Binh, Gia Lai, Dak Lak, Kien Giang and An Giang) (Nguyen et al. 2016). It is also known from Thailand and Myanmar (Gates 1939, 1972).
description: Published as part of <i>Nguyen, Tung T., Trinh, Kim-Binh T., Nguyen, Hong-Lan T. &amp; Nguyen, Anh D., 2017, Earthworms (Annelida: Oligochaeta) from islands of Kien Hai District, Kien Giang Province, Vietnam, with descriptions of two new species and one subspecies, pp. 883-915 in Journal of Natural History 51 (15 - 16)</i> on pages 888-890, DOI: 10.1080/00222933.2017.1294213, http://zenodo.org/record/5180885
description: {"references": ["Gates GE. 1930. The earthworms of Burma. I. Rec Indian Mus. 32: 257 - 356.", "Gates GE. 1939. Thai earthworms. Thailand Res Soc Nat Hist Suppl. 12: 65 - 114.", "Gates GE. 1972. Burmese earthworms: an introduction to the systematics and biology of megadrile oligochaetes with special reference to Southeast Asia. Trans Am Philosophical Soc NS 62: 1 - 326.", "Sims RW, Easton EG. 1972. A numerical revision of the earthworm genus Pheretima auct. (Megascolecidae: Oligochaeta) with the recognition of new genera and an appendix on the earthworms collected by the Royal Society North Borneo Expedition. Biol J Linnean Soc. 4: 169 - 268.", "Nguyen TT, Nguyen AD, Tran TTB, Blakemore RJ. 2016. A comprehensive checklist of earthworm species and subspecies from Vietnam (Annelida: Clitellata: Oligochaeta: Almidae, Eudrilidae, Glossoscolecidae, Lumbricidae, Megascolecidae, Moniligastridae, Ocnerodrilidae, Octochaetidae). Zootaxa. 4140: 1 - 92."]}