Amynthas morrisi ( Beddard, 1892 )

Tiwari, Nalini, James, Samuel W. & Yadav, Shweta, 2024, Pheretimoid earthworms of India: new insight from molecular systematics and phylogenetic relationship with new records, Organisms Diversity & Evolution 24 (3), pp. 313-333 : 319

Amynthas morrisi ( Beddard, 1892)

Material examined MNP17-1008-39A28, Churachandpur, Manipur, Lat / Lon : 24.3728, 93.7097, MNP17-1024-40A20, Churachandpur , close to forest office, Manipur, Lat / Lon : 24.3339, 93.7294, collected on 6th of October 2017, collected by Shweta Yadav ( Fig. 6 ) .

Description Length approximately 90 mm, diameter 4 mm. Total number of segments 79–83. Prostomium open epilobic. First dorsal pore begins from segment x/xi. Clitellum covers three segment xiv–xvi. Single, median female pore on segment xiv. Male pores paired in the setal zone of segment xviii, superficial on small, circular porophores, intervened with 18 setae between two male pores. Two pairs of spermathecal pores present in the intersegmental furrow of v/vi and vi/vii. Genital markings in post-clitellar region in segment xviii, two instantly median to individual male pore, one pre-setal and one post-setal, encircled by several concentric furrows. Additionally, presetal genital markings on xviii and xix in both specimens, numbers variable, mid-ventral or median to male pores. Also, genital markings present on pre-clitellar regions single and/or paired small discs paired on vii median to spermathecal pore, unpaired on vii, mid-ventral, pre-setal.

A single gizzard in segment x. The lateral intestinal caeca, simple with serrated margins originates in segment xvii and extends up to segment xv. Last pair of heart in segment xiii. Male organs holandric, testis sac in segment x and xi, two pairs of seminal vesicles in segment xi and xii. Prostate racemose in segment xviii, extends up to xxii, duct long, muscular. Intestine starts from segment xiv. Two pairs of spermathecae in segment vi and vii, ampulla ovoid, duct longer than ampulla, from the base of the duct arises a thin tubular, slightly iridescent club shaped diverticulum.

Figures

Fig.6 Amynthas morrisi: a prostomium; b spermathecal pores; c genital regions; d male genital region; e spermathecae; f spermathecae in situ; g prostate; h lateral intestinal caeca