Orobdella dolichopharynx, Nakano, Takafumi, 2011

Nakano, Takafumi, 2011, Redescription of Orobdella ijimai (Hirudinida: Arhynchobdellida: Gastrostomobdellidae), and two new species of Orobdella from the Ryukyu Archipelago, Japan, Zootaxa 2998, pp. 1-15 : 6-10

publication ID

https://doi.org/ 10.5281/zenodo.207870

publication LSID

lsid:zoobank.org:pub:685D1726-8F19-4E78-A9C0-2344846E85E0

DOI

https://doi.org/10.5281/zenodo.5691605

persistent identifier

https://treatment.plazi.org/id/03ED87ED-FFB3-FFB9-FF3A-FA5F260F1AFA

treatment provided by

Plazi

scientific name

Orobdella dolichopharynx
status

sp. nov.

Orobdella dolichopharynx sp. nov.

( Figs. 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7 )

Orobdella ijimai: Oka (1910 a) : 19 (in part); Oka (1910 b): 178 (in part).

Diagnosis. In life, dorsal surface yellowish green, ventral surface whitish yellow. Somite VII quadrannulate. Somite VIII quinquannulate. Somites IX–XXV complete sexannulate. Somite XXVI quinquannulate. Pharynx reaching to XVI. Gastropore absent. Gastroporal duct narrow, tubular, not joining with crop. Male gonopore in XI c 11 /c 12 or at anterior of XI c 12, close to c 11 /c 12. Female gonopore in XIII b 1 /b 2 or at anterior of XIII b 2, close to b 1 /b 2. Gonopores separated by eight annuli. Pre-atrial loop present, extending to ganglion XI. Atrial cornua absent.

Materials examined. Holotype. KUZ Z 120, mature specimen of 106.7 mm length, dissected, collected from under fallen leaves along a road at Mt. Yuwandake (alt. 448 m, 28 ° 17´11 ˝N, 129 ° 18´56 ˝E), Uken, Amamioshima Island, Kagoshima Pref., Japan, by Takafumi Nakano on April 30, 2010. Paratypes (a total of nine specimens collected from Amamioshima Island in 2009–2010). Six specimens collected from the type locality by Takafumi Nakano: KUZ Z 115 (alt. 520 m, 28 ° 17´27 ˝N, 129 ° 18´58 ˝E), dissected, on March 6, 2009; KUZ Z 116 (alt. 536 m, 28 ° 17´29 ˝N, 129 ° 19´00˝E), dissected, on March 12, 2009; KUZ Z 117 (alt. 440 m, 28 ° 17´06˝N, 129 ° 18´55 ˝ E), on August 28, 2009; KUZ Z 118 (alt. 606 m, 28 ° 17´42 ˝N, 129 ° 19´06˝E), dissected, on April 27, 2010; KUZ Z 119 (alt. 434 m, 28 ° 17´08˝N, 129 ° 18´55 ˝E), dissected, and KUZ Z 121 (alt. 448 m, 28 ° 17´11 ˝N, 129 ° 18´56 ˝E), dissected, on April 30, 2010. Three specimens collected from Kinsakubaru, by Masahiro Nishi on July 26, 2010: KUZ Z 122, dissected, KUZ Z 123 and KUZ Z 124.

Etymology. The specific name is a compound noun in apposition derived from the Greek words transliterated into Latin, dolicho (long), and pharynx (pharynx), referring that the pharynx of this new species is reaching to somite XVI (those of the other known Orobdella species in Japanese islands north of the Ryukyu Archipelago are reaching to somite XIV).

Description of holotype. Body firm, muscular, BL 106.7 mm, BW 6.6 mm ( Fig. 5 View FIGURE 5 ). Caudal sucker ventral, oval, its diameter slightly smaller than maximum body width ( Fig. 6 View FIGURE 6 D). In life, dorsal surface yellowish green, ventral surface whitish yellow, dorsal surface darker than ventral surface. Color faded in preservative, without any dark lines.

Somite I completely merged with prostomium ( Fig. 6 View FIGURE 6 A). Somite II uniannulate, not separated from I ( Fig. 5 View FIGURE 5 A). Somite III uniannulate ( Fig. 6 View FIGURE 6 A). Somite IV biannulate ( Fig. 6 View FIGURE 6 A). Somite V biannulate, a 3 forming posterior margin of oral sucker ( Fig. 6 View FIGURE 6 A, B). Somites VI triannulate ( Fig. 6 View FIGURE 6 A, B). Somite VII complete quadrannulate, a 1 = a 2> b 5 = b 6 ( Fig. 6 View FIGURE 6 A, B). Somite VIII complete quinquannulate, a 1> a 2 = b 5> c 11 = c 12 ( Fig. 6 View FIGURE 6 A, B). Somite IX complete sexannulate, b 1 <b 2 = a 2 = b 5> c 11 = c 12. Somites X–XXV complete sexannulate, b 1 = b 2 = a 2 = b 5 = c 11 = c 12 ( Fig. 6 View FIGURE 6 C–E, H), X a 2 the first annulus of the clitellum, XIII b 5 the last annulus of the clitellum. Somite XXVI quinquannulate, b 1 = b 2 = a 2 <b 5> b 6, b 6 the last complete annulus on the venter ( Fig. 6 View FIGURE 6 C, D). Somite XXVII incomplete biannulate ( Fig. 6 View FIGURE 6 C). Anus behind XXVII ( Fig. 6 View FIGURE 6 C). Post-anal annulus absent ( Fig. 6 View FIGURE 6 C).

Anterior ganglionic mass in VI a 2 and a 3. Ganglion VII in a 2. Ganglia VIII–XXI in a 2 of each somite ( Fig. 6 View FIGURE 6 H). Ganglia XXII–XXV in b 2 and a 2 of each somite. Ganglion XXVI in b 1 and b 2. Posterior ganglionic mass in XXVI a 2 –b 6.

Eyes three pairs, first pair dorsally in II, second and third pairs dorsolaterally on posterior margin of V (a 1 + a 2) ( Fig. 6 View FIGURE 6 A). Nephridiopores 17 pairs, ventrally at posterior margin of a 1 at VIII and b 2 of each somite, at IX– XXIV ( Fig. 6 View FIGURE 6 B, E). Papillae numerous, minute, hardly visible, one row on every annulus.

Pharynx agnathous, euthylaematous, reaching to XVI b 2 /a 2. Crop tubular, acecate, in XVI b 2 /a 2 to XXII a 2. Gastropore absent ( Fig. 6 View FIGURE 6 E, G). Gastroporal duct narrow, tubular but slightly bulbous at female gonopore, in XIII b 1 /b 2 to XVI b 2, not joining with crop ( Fig. 6 View FIGURE 6 F). Intestine tubular, acecate, in XXII a 2 to XXIV/XXV. Rectum tubular, thin-walled.

Male gonopore at anterior of XI c 12, close to annular furrow of c 11 /c 12 ( Fig. 6 View FIGURE 6 E). Female gonopore at anterior of XIII b 2, close to annular furrow of b 1 /b 2 ( Fig. 6 View FIGURE 6 E, G). Gonopores separated by 8 annuli ( Fig. 6 View FIGURE 6 E). Testisacs multiple, two or three testisacs on each side in each annulus, in XVII b 5 to XXV b 5 ( Fig. 6 View FIGURE 6 H). Epididymides absent. Ejaculatory bulbs absent ( Fig. 6 View FIGURE 6 H). ejaculatory ducts in XI a 2 to XVII a 2, coiled, widen from each junction with testisacs, narrow gradually toward each junction with atrium, with pre-atrial loop extending to ganglion XI ( Fig. 6 View FIGURE 6 H, I). Atrial cornua absent. Atrium rudimentary in XI c 11 and c 12 ( Fig. 6 View FIGURE 6 H, I). Ovisacs one pair, thin-walled, globular, in XIII a 2 ( Fig. 6 View FIGURE 6 H, J). Oviduct thin-walled, right oviduct crossing ventrally beneath nerve cord, both oviducts converging into common oviduct in XIII b 2 ( Fig. 6 View FIGURE 6 H, J). Common oviduct thin-walled, very short, directly descending to female gonopore ( Fig. 6 View FIGURE 6 H, J).

Variation. Somite VII triannulate ( KUZ Z 124) or ventrally triannulate ( KUZ Z 118, Z 122). Somite XXVII incomplete biannulate or triannulate. Clitellum from X b 5 to XIII a 2 –XIV b 1. Pharynx reaching to XVI b 1 –c 11. Crop reaching to XXII b 1 –XXIII b 1. Gastroporal duct tends to attach ventral sinus ( Fig. 7 View FIGURE 7 ). Intestine reaching to XXIV c 11 –XXV b 1 /b 2. Male gonopore in XI c 11 /c 12 or at anterior XI c 12. Female gonopore in XIII b 1 /b 2 or at anterior of XIII b 2. Testisacs in XVIII b 1 –XVIII b 5 to XXV a 2 –c 11.

Distribution and ecology. Known from the mountain region of Amamioshima Island in the Ryukyu Archipelago, Japan ( Fig. 1 View FIGURE 1 ). Leeches were found under rocks or fallen leaves.

Remarks. Orobdella dolichopharynx was considered to be Orobdella ijimai ( Oka 1910 a; b). However, O. dolichopharynx is easily distinguished from the latter by the number of annuli between the gonopores.

KUZ

Zoological Collection of the Kyoto University

Kingdom

Animalia

Phylum

Annelida

Class

Clitellata

Order

Arhynchobdellida

Family

Gastrostomobdellidae

Genus

Orobdella

Loc

Orobdella dolichopharynx

Nakano, Takafumi 2011
2011
Loc

Orobdella ijimai:

Oka 1910: 19
Oka 1910: 178
1910