An exceptionally rich complex of Sanguinicolidae von Graff, 1907 (Platyhelminthes: Trematoda) from Siganidae, Labridae and Mullidae (Teleostei: Perciformes) from the Indo-west Pacific Region
Author
Nolan, Matthew J.
m.nolan1@uq.edu.au
Author
Cribb, Thomas H.
text
Zootaxa
2006
2006-05-26
1218
1
1
80
https://biotaxa.org/Zootaxa/article/view/zootaxa.1218.1.1
journal article
10.11646/zootaxa.1218.1.1
11755334
5064858
46D415C4-4133-4148-8F4A-74E97206BCD3
Phthinomita littlewoodi
n. sp.
(
Figs. 38–40
)
Type
host:
Siganus lineatus
(Valenciennes)
, Goldlined Rabbitfish (
Perciformes
:
Siganidae
).
Other hosts:
S
.
corallinus
(Valenciennes)
, Coral Rabbitfish (
Perciformes
:
Siganidae
).
Site in host: Intertrabecular spaces of ventricle (heart).
Type
locality:
Heron Island
,
southern Great Barrier Reef
(
23°27’S
151°55’E
),
Queensland
.
Other
localities:
Lizard Island
,
northern Great Barrier Reef
(
14°40’S
145°27’E
),
Queensland
.
Material examined: ex
S
.
lineatus
, Heron
Island (QLD),
Apr. 2001
,
Feb. 2002
,
May. 2003
, fifteen specimens (
Holotype
no.
QM
G 225607;
Paratype
nos.
QM
G 225608–225611); ex
S
.
corallinus
, Lizard
Island (QLD),
Aug. 2002
,
May 2004
,
six specimens
(
Paratype
no.
QM
G 225612).
Collector: M.J. Nolan.
Etymology
Specific name for Dr Timothy Littlewood of the Natural History Museum, London, in honour of his contributions to the field of platyhelminth phylogenetics.
Description
Based on 21 whole mounts. With features of genus. Body not curving dorsally posteriorly, slightly notched at male pore. Intestine; posterior caeca irregular in outline, distal extremities expanded. Anterior testis originates posterior to posterior caeca, margins lobed. Posterior testis elliptical, margins lobed. Cirrussac tearshaped to spherical. Internal seminal vesicle spherical or ovoid, occupying centre of cirrussac; ejaculatory duct sinuous; prostatic cells not seen. Ovary ovoid to spherical, posterior to posterior margin of anterior testis, medial. Oviduct originating at centre of posterior margin of ovary. Vitelline duct forming posterior to posterior margin of ovary, sinuous; vitelline reservoir forming anterior to anterior margin of cirrussac, convoluted, entering oötype posterodorsally. Oötype spherical, medial. Mehlis’ gland extending anteriorly to posterior margin of cirrussac, extending posteriorly to anterior margin of posterior testis. Uterus extending from oötype, sinuous. Uterine chamber forming posterior to posterior margin of ovary, straight, thin. Vitelline follicles extending anteriorly past intestinal bifurcation, extending posteriorly past posterior margin of uterine chamber, filling intercaecal field, posteriorly passing medially.
FIGURE 38.
Phthinomita littlewoodi
n. sp.
from the intertrabecular spaces of ventricle (heart) of
Siganus lineatus
off Heron Island. Adult. Lateral anteriorly, medially twisting dorsoventrally at level of “arrow a”, dorsal posteriorly, whole mount.
Scalebar:
250 m.
FIGURES 39–40.
Phthinomita littlewoodi
n. sp.
39. Male terminal genitalia, lateral view. 40. Female terminal genitalia, dorsal view.
Scalebars:
39, 100 m; 40, 250 m.
Remarks
Phthinomita littlewoodi
agrees well with the characters of
Phthinomita
and is distinguished by having the combination of a body 2993–4133 (3465) x 64–122 (94) with only a slight notch level with the male genital pore (by comparison to that of
P. brooksi
), an oesophagus that extends 24–42% of the body length, an anterior testis that is positioned posteriorly to the posterior caeca and occupies 16–31% of the body length, an anterior testis 4.4–12.4 times longer than the posterior testis, a tearshaped cirrussac, a uterine chamber 107–161 (127) long and vitelline follicles that extend anteriorly past the intestinal bifurcation.
There are in addition, 1–33 base differences (0.3–10.0% sequence divergence) between the ITS2 rDNA sequence of
P. littlewoodi
and the remaining
Phthinomita
species
sequenced here.