Scaptobdella sumatrensis, (HARDING, 1931)

SCAPTOBDELLA SUMATRENSIS ( HARDING, 1931)

( FIGS 15–17)

Acrabdella sumatrensis Harding, 1931: 222–223 , figs 1, 2. – Soós, 1966b: 154.

Scaptobdella sumatrensis – Sawyer, 1986: 697, 751.

Diagnosis: Male gonopore in somite XI c11/c12, female gonopore in somite XII c11/c12, gonopores separated by six annuli. Pharyngopore and pharyngoporal duct present, dorsally in centre of somite XIV c12.

Syntypes: BMNH 1929.4 .22.1, two individuals, both dissected, collected from Korinchi Peak , Sumatra, 7300 ft. (= Gunung [= Mt.] Kerinci; ~ 1.69°S, ~ 101.26°E; elevation 2235 m; Sumatra, Indonesia), on 22 April 1929, through Robinson-Kloss Expedition ( Fig. 15E). One specimen lacking a portion of somite I to the middle of somite GoogleMaps VII (syntype #1; Fig. 15A, B); the other individual had already been dissected into five pieces (syntype #2; Fig. 15C, D)

Description of syntypes: BL> 150 mm (157.6 mm in syntype #2;> 150.3 mm in syntype #1), BW 17.4–21.3 mm ( Fig. 15A–D). Caudal sucker ventral, elliptic; CL

7.8–8.4 mm, CW 8.7–12.4 mm ( Figs 15B, 16F). Annulation of somite I–VII comprising 17 annuli altogether ( Fig. 16A, B); 1st annulus completely merged with prostomium, then 2nd (peristomium) <3rd> 4th <5th> 6th = 7th = 8th = 9th = 10th = 11t h = 12th <13th = 14th> 15th = 16th <17th; posterior margin of oral sucker undetermined. Accordingly, annulation of somites I–VII tentatively interpreted as follows ( Fig. 16A, B): somite I merged with prostomium; somite II (= peristomium) uniannulate; somite III and IV biannulate, (a1 + a2)> a3, IV a3 with slight dorsal furrow; somite V triannulate, a1 = a2 = a3; somites VI and VII quadrannulate, a1 = a2 = b5 <b6, and a1> a2 = b5 <b6 (c11 = c12 dorsally), respectively. Somite VIII quinquannulate, a1 (b1 = b2)> a2 = b5> c11 = c12, each of a2 and b5 with slight dorsal furrow. Somites IX–XVIII sexannulate; IX–XIV, b1 <b2 <a2 = b5> c11 = c12, each of a2 and b5 with slight dorsal to ventrolateral furrow ( Fig. 16C, D); XV, b1 <b2 = a2> b5 = c11 = c12, each of b2–c12 with slight lateral furrow on respective sides; XVI, b1 (c1 = c2 dorsally) <b2 (c3 = c4) = a2 (b3 = b4) = b5 (c9 = c10) = c11 = c12, c12 with slight furrow; XVII, b1 <b2 (c3 = c4) = a2 (b3 = b4) = b5 (c9 = c10)> c11 <c12 (d23 = d24 dorsally), c11 with slight dorsal furrow; XVIII, b1 <b2 (c3 = c4 dorsally) <a2 (b3 = b4 dorsally) = b5 (c9 = c10)> c11 (d21 = d22 dorsally) = c12 (d23 = d24 dorsally). Somites XIX and XX septannulate: XIX, b1 <b2 (c3 = c4) <a2 (b3> b4)> c9> c10 <c11 = c12, each of c11 and c12 with slight lateral to ventral furrow; XX, b1 <b2 (c3 = c4 dorsally) = a2 (b3 = b4 dorsally)> c9 = c10 <c11 = c12, each of c11 and c12 with slight furrow. Somite XXI sexannulate, b1 (c1 = c2) <b2 (c3 = c4) = a2 (b3 = b4) = b5 (c9 = c10)> c11 (d21 = d22) = c12 (d23 = d24). Somites XXII and XXIII septannulate: XXII, b1 <b2 (c3 = c4) = a2 (b3 = b4)> c9 = c10 <c11 (d21 = d22) <c12 (d23 = d24 dorsally); XXIII, b1 <b2 <a2> c9 = c10 <c11 <c12, c11 with slight lateral furrow on respective sides, c12 with slight dorsal furrow. Somite XXIV quinquannulate, b1 <b2 (c3 = c4) <a2 <b5 (c9 = c10) = b6 (c11 = c12) ( Fig. 16E, F). Annulation of somites XXV–XXVII comprising six or seven annuli altogether ( Fig. 16E, F); anus with one or two post-anal annuli. Annulation of somite XXV–XXVII tentatively interpreted as follows ( Fig. 16E, F): somite XXV quinquannulate, b1 <b2 <a2 = b5 (c9 = c10)> b6; somite XXVI more than one annulus with slight dorsal furrow, being last complete annulus on venter; somite XXVII uniannulate; anus at somite XXV/XXVI with one to two post-anal annuli.

Male gonopore in somite XI c11/c12 ( Fig. 16C). Female gonopore in XII c11/c12 ( Fig. 16C). Gonopores separated by six annuli ( Fig. 16C).

Anterior ganglionic mass in 13th and 14th annuli (somite VI b6 and somite VII a1) ( Fig. 16B). Ganglion VII undetectable. Ganglion VIII in a2, or a1 and a2. Ganglia IX and X, of each somite, in b2 and a2. Ganglia XI–XIII, of each somite, a2, or b2 and a2 ( Fig. 17C). Ganglia XIV–XVII, of each somite, in a2 ( Fig. 17C). Ganglia XVIII and XIX, of each somite, in b2 ( Fig. 17C). Ganglia XX and XXI, of each somite, in b2 and a2. Ganglion XXII undetectable. Ganglion XXIII in b2 and a2. Ganglia XXIV and XXV, of each somite, in b2. Ganglion XXVI coalescing with posterior ganglionic mass. Posterior ganglionic mass in somite XXV b5 and XXVI.

Eyes undetectable.

Nephridiopores in 17 pairs, one each situated ventrally at posterior margin of a1 of somite VIII, at posterior margin of b2 of each somite in XIX–XXIV ( Fig. 16C, F).

Pharynx ( Fig. 17A) reaching to somite XIV/XV–XV b2/b2. Pharyngopore dorsal, in centre of somite XIV c12 ( Fig. 16D). Pharyngoporal duct simple, straight, descending to pharynx terminal end, in somite XIV c12 ( Fig. 17B). Crop reaching to somite XXI a2; terminal end of crop forming weakly developed sphincter between crop and intestine, in somites XXI b1/b2–a2. Intestine reaching to somite XXIII b1/b2.

Testisacs uncountable ( Fig. 17C); on right side, from somite XVIII c11; on left side, from somite XIX b1; terminal end of testisacs undetectable. Paired sperm ducts coiled, narrowing at junction with atrial cornua, then running proximally toward atrial cornua ( Fig. 17C); right sperm duct in somite XI c12–XI/XII to somite XVIII c11–XIX b1; left sperm duct in somite XI c12–XI/ XII to somite XIX b1. Pair of atrial cornua conical, curved posterolaterally, in somite XI c11 and c12 ( Fig. 17C–F). Atrium globular, in somite XI b5–c12 ( Fig. 17C–F).

One pair of ovisacs long, thin walled, slightly folded, mostly running dorsally on respective sperm ducts ( Fig. 17C, G); right ovisac in somite XII c12 to somite XV b5; left ovisac in somite XII c12 to somite XV a2/b5; both ovisacs turned posterodistally in somite XIII b2; converging in somite XII c12.