Parasabanema szalayi, Smales & Heinrich, 2010

Smales, L. R. & Heinrich, B., 2010, Gastrointestinal nematodes of Paramelomys rubex (Rodentia: Muridae) from Papua Indonesia and Papua New Guinea with the descriptions of three new genera and four new species of Helligmonellidae and Herpetostrongylidae (Nematoda: Trichostrongylida), Zootaxa 2672 (1), pp. 1-28 : 21

publication ID 10.11646/zootaxa.2672.1.1


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scientific name

Parasabanema szalayi

sp. nov.

Parasabanema szalayi sp. nov.

( Figs 117–132 View FIGURES 117–132 )

Type host. Paramelomys rubex (Thomas)

Site in host. Small intestine.

Material examined. Holotype male, allotype female from Paramelomys rubex Finimterr above Hindenberg Wall , Western Province, coll. T. Flannery & L. Szalay 3. v. 1992, AM W.36808, W.36809; paratypes 7 males 4 pieces of male, 6 females 12 pieces of female same data AM W.36810.

Other material examined. From Paramelomys rubex Papua New Guinea, Sanduan Province; 3 males Ofektaman, Telefomin area (5° 5´S; 141° 35´E) AM GoogleMaps W.36811; 3 males, 2 females 1 piece, hill S of Tifalmin (5° 7´S; 141° 25´E) AM GoogleMaps W.36812; 1 male, 2 females Bokubet 10k E Feramin BBM NG105251; 1 male, 1 female Lake Louise 17 mi WNW Telefomin BBM NG99980: Indonesia, Papua; 2 males, 2 females, 5 pieces of females Mokwan area , Arfak Mts (1° 6´S; 133° 56´E), AM W36813 View Materials GoogleMaps , W.36814.

Etymology. The species is named after L. Szalay who helped collect the hosts.

Description. General: Relatively robust worms, prominent cephalic vesicle present with about 7–8 annulations; buccal capsule vestigial. Mouth opening triangular with rudimentary lips; labial and cephalic papillae not observed. Oesophagus claviform. Nerve ring in mid oesophageal region, deirids and excretory pore in post oesophageal region. Synlophe (based on sections from 12 worms) of pointed longitudinal cuticular ridges in both sexes extends from posterior margin of cephalic vesicle to immediately anterior to bursa or vulva; 32–42 ridges in anterior, 36–45 in midbody, 35–45 in posterior. Axis of orientation of ridges sub frontal; 15–26 ridges dorsal side, 15–20 ridges ventral side. There is no consistent pattern in the size and number of ridges between anterior and posterior regions or between males and females; ridges in posterior body without orientation.

Male: (Measurements of 6 specimens) Length 4500–7200 (6060), maximum width 87–136 (101). Cephalic vesicle 40–53 (48) long. Oesophagus 280–380 (330) long; nerve ring 180–230 (210), deirids, excretory pore, 210–315 (257) from anterior end. Bursa (based on 9 worms) with right lobe slightly larger than left, ventral portion extended distally; pattern of rays 3–2 for both lobes; rays 2, 3 diverge distally, recurved ventrally; rays 4 recurved ventrally; 5, 6 recurved dorsally; rays 4, 5, more stout than rays 6; rays 2, 3 more slender, rays 3 longest. Dorsal lobe with median notch, about same length as laterals; dorsal trunk bifurcates at about 2/3 its length, each branch dividing again at distal tip; terminal divisions, rays 9, 10, symmetrical, rays 8 arising at same level from dorsal trunk proximally to division of dorsal ray. Genital cone small, ventral lip with unpaired papilla 0, dorsal lip with paired papillae 7. Spicules filiform tips simple 380– 503 (414) long. Gubernaculum 27–42.5 (35.5) long.

Female: (Measurements of 8 specimens) Length 7230–12500 (7000), maximum width 106–268 (137). Cephalic vesicle 42.5–52.8 (48) long. Oesophagus 363–429 (396) long; nerve ring 157–195 (178), deirids, excretory pore 241–345 (300) from anterior end. Monodelphic ovejector, vulva near posterior end, 90–210 (127) from tail tip; vagina 30–35, vestibule, 70–90, longer than sphincter, 30–40, infundibulum longest, 110– 120. Tail reflected ventrally, with praepuce, 25–36 (30) long. Tail tip blunt, conical. Eggs thin shelled, ellipsoidal, in utero 60–72.6 (68) by 30–36.3 (34).

Remarks. This helligmonellid parasite of a hydromyin rodent from the Island of New Guinea, Parasabanema n. g., has all the characteristics of the subfamily Nippostrongylinae (see Durette-Desset 1983). The morphology of the synlophe, with the left side dilated and 32–45 ridges oriented sub frontally but with no consistent pattern of size gradients of the ridges is closest to that of Malaistrongylus and Sabanema which also have numerous ridges ( Ow Yang et al. 1983). Malaistrongylus differs in that the dorsal ridges are the largest and Sabanema in having the dorsal left and ventral right ridges smallest. The bursal rays 4 and 5 not fused and the dorsal ray divides distally to the origin of rays 8 in compared with rays 4 and 5 fused and rays 8 arising close to the division of the dorsal ray further distinguishes Parasabanema from Malaistrongylus . Parasabanema can be further distinguished from Sabanema in that the dorsal lobe of the bursa has a median notch; rays 3 are elongated and the dorsal trunk is elongated in Parasabanema and not as in Sabanema ( Ow Yang et al. 1983) .


Tavera, Department of Geology and Geophysics


Australian Museum

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