Prostheceraeus fuscolineatus
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Ordo: Polycladida
Familia: Euryleptidae
Genus: Prostheceraeus
Name
Prostheceraeus fuscolineatus Dixit, Sudhanshu, 2017 – Wikispecies link – Pensoft Profile
- Prostheceraeus fuscolineatus Dixit, Sudhanshu, 2017, Zootaxa 4269: 505-510.
Materials Examined
India Mayabunder India Paget Island India Point Island
Etymology
Etymology. Named from Latin; fuscus (adj.) = brown, linea = line, because of presence of brown lines on dorsum.
Diagnosis
Diagnosis. Body elongate and leaf like with white background colour. Dorsum is covered with brown continuous longitudinal stripes with two black stripes on both sides and all stripes joining at posterior end giving a conical appearance. Tentacles erected, pointed and black with a white area in between. Ventral surface white (Fig. 10.A, B).
Description
Description. Live. Body elongate, slightly tapering at posterior side and smooth at margins with no ruffles. Background body color white with brown continuous longitudinal feebly undulate stripes with two black stripes on both sides. All stripes joining at posterior end at one point. No stripes at extremities leaving a white rim around the body. Tentacles black, pointed and erected with a patch of white in the area between the two tentacles (Fig. 10.A, B); numerous eyespots present on ventral side of tentacles. Cerebral eyespots present in two close elongate but slightly curved rows with a total of around 70 eyes (paratype) (Fig. 10 C). Ventrally white in colour. Preserved. Preserved specimen was cream coloured due to loss of pigments during fixation. The distance between pharyngeal mouth and male pore is 0.4 mm while male pore and sucker are 0.86 mm apart. The total distance between pharyngeal mouth and sucker is 1.2 mm. Body wall composed of ciliated epithelium that surrounds the entire body. A distinct but very thin basement membrane separates epithelial cells from underlying muscular layers, thickness of epithelium dorsally as well as ventrally varies from 0.02–0.03 mm. A large bell shaped tubular pharynx, 702 µm long with an area of 217 µm2 is oriented frontally. Details of ventral surface of a paratype specimen are provided in Fig. 10 D. Reproductive characters.Male copulatory apparatus posterior to male gonopore. A small, spherical and thick layered seminal vesicle (138 × 97 µm) is present and its epithelial thickness varied from 11 to 14 µm (Fig. 11 D). Very close to seminal vesicle, a prostatic vesicle roughly of same size of seminal vesicle but slightly elongate in shape is present (155 × 58 µm). Penis papilla rounded in shape and 90 µm long with a small stylet. Male atrium ciliated and in shape of half moon. Female reproductive system was not visible possibly due to immaturity of specimen.
Name Prostheceraeus panamensis Woođworth, 1894 Colour anđ pattern Ređđish brown međially anđ fainteđ građually towarđs margins (alcohol preserveđ). Irregular meshwork with colourless interspaces. Reprođuctive system Not stuđieđ Type locality West coast of Panama Distribution Not recorđeđ elsewhere, only in Panama (Woođworth, 1894) Prostheceraeus vittatus (Montagu, 1815) Backgrounđ colour white or ivory with many black continuous anđ non-continuous stripes Antero-đorsally orienteđ true prostatic vesicle; short penis papilla; Copulatory complex lies forwarđly orienteđ Kingsbriđge Estuary, South Devon, Englanđ UK (Montagu, 1815); Spain (Norena et al., 2014); Scotlanđ (Newman & Cannon, 2003); Italy (Lang, 1884); Sweđen, France, Irelanđ, Norway (Newman & Cannon, 2005) Prostheceraeus roseus Lang, 1884 Pink to purple pigmentation with white longituđinal stripes anđ white eđge Male copulatory apparatus frontally orienteđ; penis armeđ with stylet; female complex with multiple uterine vesicles Naples, Italy Italy (Lang, 1884); Ria đe Arosa, Spain (Norena et al., 2014) Prostheceraeus pseudolimax Lang, 1884 Backgrounđ white; broađ yellow međian stripe with black borđer; many think anđ thin longituđinal black stripes; all stripes joining at posterior enđ. Not stuđieđ Naples, Italy Not recorđeđ elsewhere, only in Italy (Lang, 1884) Prostheceraeus giesbrechtii Lang, 1884 Backgrounđ white; yellow međian stripe; numerous pink longituđinal stripes; all stripes joining at posterior enđ. Not stuđieđ Naples, Italy Italy (Lang, 1884); Canary Islanđs, Spain; Crete, Greece anđ Sicily (Newman & Cannon, 2003& 2005) Prostheceraeus fuscolineatus sp. nov. Backgrounđ white to cream; đorsum with brown longituđinal stripes; two black longituđinal stripes on both siđes near margins; all stripes joining at posterior enđ. Prostatic vesicle free anđ very closely present with seminal vesicle, both vesicles situateđ behinđ male pore Mayabunđer, Anđaman anđ Nicobar Islanđs, Inđia Not recorđeđ elsewhere
Taxonomic remarks. Presence of characters like tubular pharynx, conspicuous tentacles, arrangement of eyes in two rows and smooth glandular epithelium of true prostatic vesicle place this newly described species under the Family Euryleptidae while presence of longitudinal stripes on dorsum, elongate leaf like body, smooth dorsal surface agrees to the characters of the genus Prostheceraeus. The newly described species was compared to all other members of genus Prostheceraeus exhibiting longitudinal stripes on dorsum namely Prostheceraeus panamensis Woodworth, 1894; Prostheceraeus vittatus (Montagu, 1815); Prostheceraeus roseus Lang, 1884; Prostheceraeus pseudolimax Lang, 1884 and Prostheceraeus giesbrechtii Lang, 1884 but was found unmatched with any of the above mentioned species. Detailed comparison is given in Table. 2. This will be the first description of any species under the Genus Prostheceraeus from Indian Ocean region as majority of previously described valid species are from Mediterranean region and one species from West Panama coast. Therefore, this newly described species will be second species after Prostheceraeus panamensis Woodworth, 1894 (described from Panama), which is being described from tropical sea area and will result in increment of habitat range of the genus Prostheceraeus from temperate to eastern tropical sea. Based on above mentioned characters, Prostheceraeus fuscolineatus sp. nov. is considered as a new species and seems to be rare with no photographic record elsewhere.
Taxon Treatment
- Dixit, Sudhanshu; Raghunathan, C.; Chandra, Kailash; 2017: Two new Pseudoceros (Polycladida: Pseudocerotidae) and a Prostheceraeus (Polycladida: Euryleptidae) from Andaman and Nicobar Islands, India, Zootaxa 4269: 505-510. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
