Phthinomita brooksi, Nolan & Cribb, 2006
publication ID |
https://doi.org/ 10.11646/zootaxa.1218.1.1 |
publication LSID |
lsid:zoobank.org:pub:46D415C4-4133-4148-8F4A-74E97206BCD3 |
persistent identifier |
https://treatment.plazi.org/id/478AE295-B321-44F7-BB36-5EC564C042D4 |
taxon LSID |
lsid:zoobank.org:act:478AE295-B321-44F7-BB36-5EC564C042D4 |
treatment provided by |
Felipe |
scientific name |
Phthinomita brooksi |
status |
sp. nov. |
Phthinomita brooksi View in CoL n. sp. ( Figs. 26–28 View FIGURE 26 View FIGURES 27–28 )
Type host: Siganus virgatus (Valenciennes) , Barhead Rabbitfish ( Perciformes : Siganidae ). Site in host: Intertrabecular spaces of ventricle (heart). Type locality: Ningaloo Reef (21°54.6’S 113°58.4’E), Western Australia. Material examined: ex S. virgatus, Ningaloo Reef (WA) , Aug. 2003, twentysix specimens (Holotype no. QM G 225548; Paratype nos. QM G 225549–225552 and QM G 225558–225562). Collector: M.J. Nolan.
Etymology
Specific name for Dr Daniel Brooks, for his contributions to digenean phylogenetic theory.
Description
Based on 26 whole mounts. With features of genus. Body distinctly notched level with male genital pore. Intestine; posterior caeca irregular, distal terminations expanded. Anterior testis originating posterior to intercaecal field, margins lobed, appearing segmented or convoluted, containing dorsoventral muscle fibres. Posterior testis elliptical, margins lobed. Cirrussac elongate, elliptical, sinuous, narrow ventrally, widening dorsally. Internal seminal vesicle occupying most of cirrussac, of similar shape to cirrussac; ejaculatory duct straight or sinuous, prostatic cells small. Ovary ovoid to spherical, posterior to posterior margin of anterior testis. Oviduct passing posteriorly sinuously, entering oötype posterodextrally. Vitelline duct forming anterior to cirrussac, passing posteriorly sinuously; vitelline reservoir forming lateral to posterior margin of cirrussac, entering oötype posteriorly. Oötype ovoid. Mehlis’ gland extending anteriorly past posterior portion of distinct notch in body wall, extending posteriorly to midsection of posterior testis. Uterus extending from oötype, sinuous, sinistral to oviduct. Uterine chamber forming laterally to posterior margin of ovary, passing posteriorly slightly sinuously, narrowing posteriorly, passing dorsally to female pore. Vitelline follicles occupy intercaecal field anteriorly, posteriorly extending past ovary.
Remarks
This species agrees well with the characters of Phthinomita and appears most closely related to the type species, P. symplocos . These species share similar body length: width ratios, the relative length of the oesophagus, and the relative lengths of the anterior and posterior caeca and the position of the anterior testis relative to the intestine. They also share a similarly sized posterior testis and ovary (relative to body size) and the relative position of the cirrussac and ovary from the posterior end. Most of these similarities are also shared with P. adlardi ; the exception is the position of the anterior testis relative to the posterior caeca (the anterior testis of P.adlardi originates posterior to the intercaecal field, but, anterosinistral to the distal termination of the right posterior caecum). Phthinomita brooksi differs from P. symplocos , in having a highly lobed (and possibly convoluted) anterior testis and a uterine chamber that originates laterally to the posterior margin of the ovary. The new species differs from P. adlardi in having an anterior testis occupying 12–24% of the body length instead of 38–59% and having an anterior testis 2.4–6.8 times longer than the posterior testis rather than 12.6–38.2 times longer. Phthinomita brooksi differs further in having the combination of an elongate and slightly sinuous cirrussac (that may be 7.0 times longer than wide), a very distinct notch level with the male genital pore and vitelline follicles that do not extend anteriorly past the intestinal bifurcation.
There are in addition, 2–34 base differences (0.5–10.3% sequence divergence) between the ITS2 rDNA sequence of P. brooksi and the remaining Phthinomita species sequenced here. There are two bases different between the sequences from P. brooksi (10 replicates) from S. virgatus from Ningaloo Reef and P. sasali n. sp. (one replicate) from S. doliatus from Palau.
QM |
Queensland Museum |
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