Amynthas srinan

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Bantaowong U, Chanabun R, Tongkerd P, Sutcharit C, James S, Panha S (2011) New earthworm species of the genus Amynthas Kinberg, 1867 from Thailand (Clitellata, Oligochaeta, Megascolecidae). ZooKeys 90 : 35–62, doi. Versioned wiki page: 2011-04-14, version 4557, https://species-id.net/w/index.php?title=Amynthas_srinan&oldid=4557 , contributors (alphabetical order): Pensoft Publishers.

Citation formats to copy and paste

BibTeX:

@article{Bantaowong2011ZooKeys90,
author = {Bantaowong, Ueangfa AND Chanabun, Ratmanee AND Tongkerd, Piyoros AND Sutcharit, Chirasak AND James, Samuel W. AND Panha, Somsak},
journal = {ZooKeys},
publisher = {Pensoft Publishers},
title = {New earthworm species of the genus Amynthas Kinberg, 1867 from Thailand (Clitellata, Oligochaeta, Megascolecidae)},
year = {2011},
volume = {90},
issue = {},
pages = {35--62},
doi = {10.3897/zookeys.90.1121},
url = {http://www.pensoft.net/journals/zookeys/article/1121/abstract},
note = {Versioned wiki page: 2011-04-14, version 4557, https://species-id.net/w/index.php?title=Amynthas_srinan&oldid=4557 , contributors (alphabetical order): Pensoft Publishers.}

}

RIS/ Endnote:

TY - JOUR
T1 - New earthworm species of the genus Amynthas Kinberg, 1867 from Thailand (Clitellata, Oligochaeta, Megascolecidae)
A1 - Bantaowong U
A1 - Chanabun R
A1 - Tongkerd P
A1 - Sutcharit C
A1 - James S
A1 - Panha S
Y1 - 2011
JF - ZooKeys
JA -
VL - 90
IS -
UR - http://dx.doi.org/10.3897/zookeys.90.1121
SP - 35
EP - 62
PB - Pensoft Publishers
M1 - Versioned wiki page: 2011-04-14, version 4557, https://species-id.net/w/index.php?title=Amynthas_srinan&oldid=4557 , contributors (alphabetical order): Pensoft Publishers.

M3 - doi:10.3897/zookeys.90.1121

Wikipedia/ Citizendium:

<ref name="Bantaowong2011ZooKeys90">{{Citation
| author = Bantaowong U, Chanabun R, Tongkerd P, Sutcharit C, James S, Panha S
| title = New earthworm species of the genus Amynthas Kinberg, 1867 from Thailand (Clitellata, Oligochaeta, Megascolecidae)
| journal = ZooKeys
| year = 2011
| volume = 90
| issue =
| pages = 35--62
| pmid =
| publisher = Pensoft Publishers
| doi = 10.3897/zookeys.90.1121
| url = http://www.pensoft.net/journals/zookeys/article/1121/abstract
| pmc =
| accessdate = 2020-11-26

}} Versioned wiki page: 2011-04-14, version 4557, https://species-id.net/w/index.php?title=Amynthas_srinan&oldid=4557 , contributors (alphabetical order): Pensoft Publishers.</ref>

See also the citation download page at the journal.


Taxonavigation

Ordo: Haplotaxida
Familia: Megascolecidae
Genus: Amynthas

Name

Amynthas srinan Panha & Bantaowong sp. n.Wikispecies linkZooBank linkPensoft Profile

Description of Holotype:

Dimensions; 47 mm by 1.8 mm at segment X, 2.3 at segment XX, 2.3 mm at clitellum; body cylindrical with 77 segments. Setae regularly distributed around segmental equators, numbering 36 at VII, 42 at XX, four between mp, setae formula AA:AB:ZZ:ZY= 1.5:1:2:1 at XIII. Single fp at XIV. Prostomium epilobic with tongue open. First dorsal pore at 4/5 or 5/6. Clitellum annular XIV–XVI with no setae.
Mp on circular porophores in XVIII, 0.30 circumference apart ventrally; distance between mp 1.5 mm. Genital markings small, postsetal, closely paired near mid ventral of XVII and XVIII. Sp paired in 7/8 at 6th setal lines, 0.26 circumference apart ventrally; distance between sp 1.5 mm. Genital markings tiny, closely paired on near mid ventral of VII and VIII.
Septa 5/6 and 6/7 thick, 7/8 thin, 8/9 and 9/10 absent, 10/11–13/14 thin. Gizzard globular within VIII–X, intestinal origin in XV, no lymph glands observed. Typhlosole small from XXVII. Ic originated from XXVII extending forward to XXIII, long finger-shape. Hearts esophageal in X–XIII. Holandric; testes and funnels in ventrally joined sacs in X–XI. Sv paired in XI–XII. Prostates in XVIII, extending between XVII–XX; prostatic ducts tightly folded twice. Genital marking glands paired in XVII and XVIII corresponding to external genital papillae, each consisting of a stalk with terminal multi-lobed glandular part.
Ovaries in XIII. Sc one pair in VIII; ampulla oval to kidney-shaped, with stout duct shorter than ampulla. Diverticulum with oval bulb terminal, stalk attached to duct near body wall. Genital markings stalked, corresponding to external genital papillae; each gland small consisting of a stalk with terminal multi-lobed glandular part.
All the key morphological characters of the holotype and paratype specimens are given in Table 5.

Table 5. Holotype and Paratype dimension and other morphological characteristics of Amynthas srinan Panha & Bantaowong, sp. n.
Characters / Types Body length (mm) Number of segments Location of genital markings First dorsal pore Number of setae Between male pore Prostate glands Intestinal caeca
preclitellum postclitellum VII XX
HolotypeCUMZ 3210 47 77 VII, VIII XVII, XVIII 5/6 36 42 4 XVII–XX XXVII–XXIII
ParatypeCUMZ 3211
1 35 75 VII, VIII XVII, XVIII 5/6 40 42 6 XVII–XX XXVII–XXV
2 44 76 VII, VIII XVII, XVIII 5/6 36 42 5 XVII–XX XXVII–XXIV
3 39 65 VII, VIII XVII, XVIII 5/6 37 46 4 XVIII–XX XXVII–XXIV
4 44 70 VII, VIII XVII, XVIII 5/6 36 49 5 XVII–XIX XXVII–XXIV
5 47 78 VII, VIII XVII, XVIII 5/6 38 45 4 XVII–XX XXVII–XXIV
6 37 68 VII, VIII XVII, XVIII 5/6 40 44 4 XVII–XX XXVII–XXV
7 38 77 VII, VIII XVII, XVIII 4/5 43 48 5 XVII–XXI XXVII–XXIV
8 37 52 VII, VIII XVII, XVIII 4/5 38 42 4 XVII–XXI XXVII–XXV
9 35 57 VII, VIII XVII, XVIII 4/5 41 44 4 XVII–XX XXVII–XXIV
10 38 78 VII, VIII XVII, XVIII 5/6 36 40 4 XVII–XX XXVII–XXIV
11 42 77 VII, VIII XVII, XVIII 4/5 42 47 4 XVII–XXI XXVII–XXIII
12 45 77 VII, VIII XVII, XVIII 5/6 39 45 5 XVII–XX XXVII–XXIV
13 40 77 VII, VIII XVII, XVIII 5/6 40 48 4 XVII–XIX XXVII–XXV
14 39 77 VII, VIII XVII, XVIII 5/6 39 47 4 XVII–XX XXVII–XXIV
15 43 77 VII, VIII XVII, XVIII 5/6 40 44 4 XVII–XX XXVII–XXIII
16 40 75 VII, VIII XVII, XVIII 5/6 41 49 4 XVII–XX XXVII–XXIV
17 37 75 VII, VIII XVII, XVIII 4/5 36 46 4 XVII–XIX XXVII–XXIV
18 36 60 VII, VIII XVII, XVIII 5/6 40 47 5 XVII–XX XXVII–XXIV
19 39 75 VII, VIII XVII, XVIII 5/6 37 44 4 XVII–XX XXVII–XXIII
20 47 78 VII, VIII XVII, XVIII 4/5 36 42 4 XVII–XX XXVII–XXV
21 42 71 VII, VIII XVII, XVIII 5/6 40 46 4 XVII–XX XXVII–XXIV
22 35 56 VII, VIII XVII, XVIII 4/5 41 43 4 XVII–XIX XXVII–XXIV
23 36 69 VII, VIII XVII, XVIII 5/6 36 45 4 XVII–XX XXVII–XXV
24 42 73 VII, VIII XVII, XVIII 5/6 36 46 4 XVII–XX XXVII–XXIV
25 44 76 VII, VIII XVII, XVIII 4/5 39 47 6 XVI–XX XXVII–XXV
26 35 69 VII, VIII XVII, XVIII 5/6 36 44 4 XVII–XIX XXVII–XXIII
27 38 75 VII, VIII XVII, XVIII 5/6 37 45 4 XVII–XX XXVII–XXIV
28 35 78 VII, VIII XVII, XVIII 5/6 39 44 4 XVII–XIX XXVII–XXV

Variation:

The holotype measures 47 mm body length with 77 segments and the first dorsal pore located at 5/6; the twenty eight paratypes range in size between 35–47 mm (39.75±4.27 mm) body length with 52–78 segments, and first dorsal pore at 4/5 (8 samples) or 5/6 (20 samples) (Table 5).

Type locality:

Srinan National Park, Nan province, Thailand, 18°22'11.1"N, 100°50'23.2"E, 607 meters elevation (30th September 2010).

Etymology:

This species was named after the type locality Srinan National Park.

Type material:

The holotype (CUMZ 3210) and 25 paratypes (CUMZ 3211) are deposited in Chulalongkorn University, Museum of Zoology. Another five paratypes will be deposited in the Biozentrum Grindel und Zoologisches Museum, Hamburg, Germany (UHH), and four paratypes in the Natural History Museum, London (NHM).

Habitat:

Found in the top soil at about 10 cm depth, the soil surface covered with leaf litters of deciduous forest. The soil was carefully dug close to the castes.

Diagnosis:

Amynthas srinan sp. n. is the smallest Amynthas ever collected in Thailand. Male pores on distinct round porophores, genital markings paired near mid ventral of VII, VIII, XVII and XVIII; each with genital marking glands. Each spermathecae consists of a kidney-shaped ampulla and an oval shaped diverticulum. Testes sacs ventrally joined, intestinal origin XV, intestinal caeca simple, first dorsal pores at 4/5 or 5/6.

Remarks:

Amynthas srinan sp. n., along with Amynthas exiguus exiguus and Amynthas tontong sp. n., is one of if not the smallest Amynthas recorded so far. It has external characteristics which are easily seen in both newly collected and preserved materials. Compared with the two other closely related species from Laos, Amynthas chandyi and Amynthas namphouinensis, which belong in the same zebrus-group, Amynthas chandyi is very similar in appearance to Amynthas srinan sp. n. However, they clearly differ in certain specific details of their significant characters, such as the distance between the mp which in Amynthas srinan sp. n. is 1.5 mm for holotype and ranged from 1.5–2.0 mm (1.41±4.27 mm), while in Amynthas chandyi this ranged from 1.5–2.4 mm. The distance between the male pores as a fraction of the estimated circumference of the 18th segment is 0.24–0.30 in Amynthas srinan sp. n., and 0.14–0.32 in Amynthas chandyi. This is not convincing as a diagnostic difference, because there is significant overlap with the highly variable Amynthas chandyi. In addition, although genital markings are clearly observed in both Amynthas chandyi and Amynthas srinan sp. n. on the sc and mp areas, Amynthas srinan sp. n. has a much larger number and different arrangement of such markings. The distance between pairs of sp is quite similar, being 1.5–2.0 mm (1.34±2.31mm) in Amynthas srinan sp. n. and 1.2–1.5 mm in Amynthas chandyi.

Original Description

  • Bantaowong, U; Chanabun, R; Tongkerd, P; Sutcharit, C; James, S; Panha, S; 2011: New earthworm species of the genus Amynthas Kinberg, 1867 from Thailand (Clitellata, Oligochaeta, Megascolecidae) ZooKeys, 90: 35-62. doi

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