Difference between revisions of "Glyphidrilus borealis"
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Ordo: Oligochaeta
Familia: Almidae
Genus: Glyphidrilus
Name
Glyphidrilus borealis Chanabun & Panha sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype: CUMZ 3223 (Fig. 20). A muddy swamp near Maeklang waterfall, Doi Inthanon National Park, Chiangmai, Thailand, 18°19'39.8"N, 098°40'10.1"E, 383 m amsl, 26 November 2009. Paratypes: 12 adults and 9 juveniles (CUMZ 3224), 3 adults (ZMH 14564), and 3 adults (NHM), all same collection data as holotype.
Other material examined
2 adults and 6 juveniles (CUMZ 3225), Wangbuaban waterfall, Mueang, Chiangmai, Thailand, 18°48'44.4"N, 098°56'29.9"E, 462 m amsl, 13 October 2009. 9 juveniles (CUMZ 3226) at Wangbuaban waterfall, 18°48'44.4"N, 098°56'29.9"E, 462 m amsl, 25 November 2009. 3 adults and 14 juveniles (CUMZ 3227), Maekachan hot spring, Wiengpapao, Chiangrai, Thailand, 19°06'51.3"N, 099°27'45.2"E, 677 m amsl, 27 November 2009. 8 adults and 156 juveniles (CUMZ 3228), Tham Luang Forest Park-Khunnam Nangnon, Maesai, Chiangrai, Thailand, 20°22'11.8"N, 099°52'16.8"E, 388 m amsl, 26 November 2009.
Etymology
The specific epithet “ borealis ” refers to the occurrence of the new species principally in the northern mountain ranges of Thailand, in various watersheds of four river basins.
Diagnosis
Medium sized limicolous earthworm with distinct expanded tissues of wi in 21, 22–27, 28, 29, clitellum in 14, 16, 17–31, 32, 33, 34, 35, 36; paired gm or asymmetrical on bc in 13, 14, 16, 17, 18–22, 23, 27, 28, 29, 30; he in 7–11; sv in 9–12; ov in 13–14; sc sessile, elongated oval or globular in 14/15–18/19 (Table 1).
Description of Holotype
Dimensions: body length 67 mm, diameter 2.5 mm in segment 8, 1.9 mm before the clitellar wi in segment 21, 1.8 mm after wi in segment 29 in clitellar region; body cylindrical in anterior part, quadrangular in transverse section-behind clitellum. 247 segments. Body colour pale brown with variations from red to pink at adjacent tissues of wi portion in different individuals of newly collected specimens. At posterior end dorsal surface considerably broader than the ventral. Clitellar wi on ventro-lateral part of clitellum in 22–28, 3.1 mm in height, and 0.6 mm in width on both sides. Prostomium zygolobous. Dorsal pores absent. Clitellum annular in 17–33. Four pairs of setae per segment from 2, setal formula aa:ab:bc:cd:dd = 1.5:0.8:1.8:0.8:1.7 in segment 8 and 1.7:0.8:1.9:0.5:2.0 in postclitellar segments. Female pores, male pores, and spermathecal pores not visible. Gm laterally paired or asymmetrical on bc in 17–22, and 29.
Septa 5/6–8/9 thicker, 9/10–14/15 thick and 15/16 to the last segment thin. Gi small, globular within 7–8. Intestine enlarged from 13. Dorsal blood vessel anterior to 7. He in 7–11. A pair of np bladder in each segment from segment 14 onwards. Sv in 9–12. Ov in 13–14. Testis in 10–11. Prostate and accessory glands absent. Sc sessile, elongated oval or globular in 14/15–18/19, about 0.2–0.3 mm in diameter, two to twelve on each side per segment.
Variation
Body lengths of adult paratypes (18) and non-types (13) ranged from 66–90 mm (71.2±7.6), with 180–284 segments. Wi in 21, 22–27, 28, 29, clitellum in 14, 16, 17–31, 32, 33, 34, 35, 36; gm laterally paired or asymmetrical on bc in 13, 14, 16, 17, 18–22, 23, 27, 28, 29, 30.
Distribution
The new species was found on the canal connected to waterfall in sandy loam topsoil (70% sand, 26% silt, 4% clay, pH 7.1–7.5) covered with the worm casts in the north of Thailand at middle to higher elevations (388–677 m amsl).
Remarks
Glyphidrilus borealis sp. n. is similar to Glyphidrilus birmanicus from Burma in the locations of wi, however Glyphidrilus birmanicus has a longer clitellum in 12, 13–43, 44, np from 13, and sc in 13/14–17/18. It is similar to Glyphidrilus jacobsoni from Sumatra in the locations of wi, but Glyphidrilus jacobsoni has a bit shorter clitellum in 18–31; four pairs of he in 8–11, and sc in 12/13–16/17.
The new species differs from the Burmese Glyphidrilus papillatus by the following character states: Glyphidrilus papillatus has a bit shorter wi in 18–23, 24, 25, 26, with longer clitellum in 14–40, and sc in 14–17.The new species differs from Glyphidrilus yunnanensis (Yunnan, China) by Glyphidrilus yunnanensis having longer wi in 22–32 and longer clitellum in 18–38, and lacks sc.Differs from Glyphidrilus vangviengensis (Song River at Vangvieng, Laos) by Glyphidrilus vangviengensis has longer wi in 24, 25–31, 32, and longer clitellum in 19, 20–35, 36, 37, and lacks sc. Differs from Glyphidrilus horsti from Pulau Berhala, Straits of Malacca by Glyphidrilus horsti has a smaller body size than the new species and shorter wi in 23, ½23–½28, 28, shorter clitellum in 17, ½18, 18, 19–28, 29, 30, ½31, he in 8, 9–11, and sc in 14–17 or 14/15–17/18.
Comparing Glyphidrilus borealis sp. n. to Glyphidrilus vangthongensis sp. n. of Phitsanulok (see below) the latter has a larger size, with longer wi in 24, 25, 26–31, 32, and longer clitellum in 12, 13, 14, 15, 16–40, 41, 42, and sc in 12/13–18/19. Glyphidrilus borealis sp. n. differs from Glyphidrilus vesper sp. n. from Tak (see below) by the following characters: Glyphidrilus vesper sp. n. has wi in 18–24, ½25, 25, with a clitellum in 14, 15, 16, 17–29, 30, 31, 32, and sc in 13/14–16/17 (Table 1).
Original Description
- Chanabun, R; Sutcharit, C; Tongkerd, P; Panha, S; 2013: The semi-aquatic freshwater earthworms of the genus Glyphidrilus Horst, 1889 from Thailand (Oligochaeta, Almidae) with re-descriptions of several species ZooKeys, 265: 1-76. doi
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