Notommata copeus Ehrenberg, 1834

Notommata copeus Ehrenberg, 1834 View in CoL ( Figs. 4B View Fig , 5 View Fig )

ǖṞÑḆệ (ljạ)

Notommata copeus Ehrenberg, 1834: p. 213 View in CoL ; Ehrenberg, 1838: p. 434, pl. LI, fig. 1.

Notommata centrura Ehrenberg, 1834: p. 211 View in CoL , pl. 9, fig. 1.

Copeus View in CoL labiatus Hudson & Gosse, 1886, p. 28, pl. XVI, fig. 1.

Material examined. Female, glycerol permanent slide ( NIBRIV0000919539 , NIBRIV0000919543 , NIBRIV 0000919544 ). Artificial waterway in Incheon ( 37°23 ʹ 24.6 ʺ N, 126°24 ʹ 33.2 ʺ E), 09 Jun. 2023. Collected by Hee-Min Yang GoogleMaps .

Diagnosis. Body large and illoricated, 850 μm in length.

Long tubular dorsal antenna located near posterior head. Posterior of body possessing long conical tail with distinct tip. Auricles long and T-shaped. Foot with two pseudosegments. Toes symmetrical, with acute point, and 40 μm in length. Two lateral antennae located middle of body. Retrocerebral organ elongated. One red eyespot located near mastax. Trophi slightly asymmetrical. Fulcrum long and straight, with expansion on distal end. Left uncus with one large tooth and three to four small teeth. Right uncus with one large tooth and two to three small teeth. Left and right manubrium both thick and S-shaped. Left manubrium 57 μm and right manubrium 64 μm in length.

Distribution. Cosmopolitan ( Segers, 2007).

Remarks. Notommata copeus is the largest species within this genus ( Nogrady and Pourriot, 1995). Among the 46 valid species, N. copeus shows the most morphological similarity to N. pachyura (Gosse, 1886) , sharing characteristics such as a large body size exceeding 500 μm, a well-developed and elongated retrocerebral organ, absence of a bladder, and a short spur on the distal foot pseudosegment. However, the most notable difference between the two species lies in the tail morphology. Notommata copeus has a long, conical tail, whereas N. pachyura possesses a large, broad tail. The morphological characteristics of the Korean specimens examined are consistent with those reported in previous studies ( Harring and Myers, 1922; Nogrady and Pourriot, 1995). This represents the third record of a Notommata species in Korea, following N. cyrtopus Gosse, 1886 and N. glyphura Wulfert, 1935 ( Song and Jin, 2000; Song, 2017).

Molecular analysis. Genomic DNA was extracted from each of the three specimens, and partial COI sequences were obtained (660 bp, PQ594386-PQ594388). No intraspecific variation was found. Interspecific variation within the genus Notommata was calculated using the partial COI sequences of N. allantois Wulfert, 1935 ( MT521624 View Materials ) and N. codonella Harring & Myers, 1924 ( DQ297785 View Materials ), with variation ranging from 13.2 to 15.9% ( Table 2).