Metaphire mangophiloides Nguyen &amp; Trinh &amp; Le &amp; Nguyen 2015, new species
Creators: name: Nguyen, Tung. T.
name: Trinh, Binh K. T.
name: Le, Nhan V.
name: Nguyen, Anh D.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Opisthopora
Megascolecidae
Metaphire
Metaphire mangophiloides

description: <i>Metaphire mangophiloides</i> Nguyen &amp; Le, new species (Fig. 3, Table 3) <b>Examined material.</b> Holotype: 1C (CTU.EW082–h01) <i>Acacia</i> plantation, Thien Tam community, Vinh Cuu District, Dong Nai Province, Vietnam (11 o 15’54.7” N; 107 o 03’52.7” E), 13 September 2012, coll. Duong Chi Trong. Paratype: 1C (CTU.EW082–p01) same data as for holotype. <b>Diagnosis.</b> Worm medium-size, length 70–74 mm, diameter 5.25–5.31 mm. Number of setae higher in pre-clitellar than post-clitellar region; setae distance aa = 1.2 ab, zz = 1.3 yz. First dorsal pore in 12/13. Multiple spermathecal pores lateroventral in intersegment 5/6. No genital markings in both spermathecal and male regions. Holandric. Intestinal caeca manicate. Septa 8/9/10 absent. <b>Etymology.</b> Named to emphasise its similarity with the species <i>Metaphire mangophila</i> (Nguyen, 2011). <b>Description.</b> External characters: Body cylindrical, medium size; length 70–74 mm, diameter 5.25–5.31 mm, segments 71–78, weight 0.94–1.28 g. Body greyish brown dorsally and paler ventrally. Number of setae higher in pre-clitellar than post-clitellar region, 68–69 in v, 62–70 in viii, 60–63 in xxv, 56–62 in xxx, 17–20 between male porophores in xviii; setae distance aa = 1.2 ab, zz = 1.3 yz. Prostomium 1/3 epilobous. First dorsal pore in 12/13. Clitellum annular, xiv-xvi, smooth, without setae and dorsal pores. Female pore single, mid-ventral in xiv. Spermathecal pores tiny, multiple, lateroventral in intersegments 5/6. Male pores deeply located inside copulatory pouches in xviii; ventral distance between male porophores about 0.3× body circumference. Copulatory pouches having small, O-shaped openings. No genital markings in both spermathecal and male regions. Internal characters: Septa 5/6/7/8 thickened, 8/9/10 absent. Oesophageal gizzard within viii–x. Intestinal origin at xv; caeca manicate, within xxvii–xxv. Last hearts in xiii. Pharyngeal micronephridia in 5/6/7. Lymph glands absent. Typhlosole simple, lamelliform. Fifteen spermathecae in intrasegmental 5/6: 6–8 on the left side and 7–9 on the right side. Ampulla opalescent, subcylindrical, but slightly enlarged distally; duct extremely short, about 1/10 of ampulla length. Diverticula waved and short, about 1/3 ampulla, attached directly to ampulla duct. Accessory glands absent in spermathecal region. Holandric. Testis sacs not separated. Seminal vesicles well developed within xi–xii, opalescent. Oviduct on septum 12/13 ventrally; a pair of small ovaries in xiii. Prostate glands large, racemose, paired in xvii–xx; prostatic ducts U-shaped. Accessory glands absent. <b>Habitat and ecology.</b> The new species was found in <i>Acacia</i> tree plantation in Thien Tam commune, Vinh Cuu District, Dong Nai Province. All specimens were collected from soil surface, just under leaf litter at the end of the rainy season. <b>Remarks.</b> This new species is fairly similar to <i>M. mangophila</i> (Nguyen, 2011) and <i>M. bitheca</i> (Kobayashi, 1936) in the following characters: genital makings absent in both spermathecal and male regions, intestinal caeca manicate. However, <i>M. mangophiloides</i> has multiple spermathecal pores in intersegment 5/6, pharyngeal micronephridia not water-drop shaped, ampulla duct extremely short (1/10 ampulla length) whereas <i>M. mangophila</i> (Nguyen, 2011) has two pairs of spermathecal pores in 5/6/7, two spermathecae in each thecal segment, pharyngeal micronephridia water-drop shaped, ampulla duct relatively long (=1/3 ampulla length). <i>M. bitheca</i> is distinguished from new species by two grouped pairs of spermathecal pores on anterior vi and vii with each group consisting of 2+2 pores, large, oval, disc-shaped male porophores, and short, cylindrical spermathecal diverticula (Kobayashi, 1936).
description: Published as part of <i>Nguyen, Tung. T., Trinh, Binh K. T., Le, Nhan V. &amp; Nguyen, Anh D., 2015, On the polythecate earthworms of the genus Metaphire (Oligochaeta: Megascolecidae) from Vietnam, with descriptions of three new species, pp. 461-470 in Raffles Bulletin of Zoology 63</i> on pages 467-469, DOI: 10.5281/zenodo.5385803
description: {"references": ["Nguyen TT (2011) Descriptions of two new species of earthworm of the genus Pheretima Kinberg, 1867 (Oligochaeta: Megascolecidae) from Mekong Delta - Vietnam. Tap Chi Sinh Hoc, 33 (1): 24 - 29.", "Kobayashi S (1936) Earthworms from Koryo, Korea. Science reports of the Tohoku University. Series 4, (Biology), 11: 140 - 184."]}