Trapania undetermined
Creators: name: Smirnoff, Dimitri S.
name: Donohoo, Samantha A.
name: Gosliner, Terrence M.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Nudibranchia
Goniodorididae
Trapania
Trapania undetermined

description: TRAPANIA SP. ‘ANILAO’
(FIGS 12C, 15, 16A)
Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. o r g: a c t: F 9 7 D E B F 9 - 5 E B B - 4 D C 8 - B C 9 6 - 5BEF74E77AF3.
Material examined: NMP 041329, originally CASIZ 182907, one specimen, dissected and sequenced, Anilao Harbor (13.75993° N 120.92617°E), Balayan Bay, Batangas Province, Luzon Island, Philippines, May 2010, collected by Peri Paleracio.
Geographical distribution: Known only from the Philippines.
External morphology: Preserved animal (Fig. 12C) 15 mm. The preserved animal has an opaque grey body covered dorsally with speckled red-brown colour characterized by small, white specks and large, white blotches of pigmentation. Notable blotches reside laterally below the rhinophores, below the gill plume and at the posterior portion of the foot. Extrarhinophoral and extra-brachial appendages have red-brown and white speckling throughout most of their length. Both pairs of appendages have a white transverse band around their middle and an opaque white apex. Rhinophores with nine lamellae and a pointed tip are uniformly wide along their length and the same colour as the red-brown body, except for white tip. Oral tentacles are coloured at their base and opaque white at the tip. Similarly, the anterior margins of the foot, which extend laterally as elongate appendages, are coloured at their base and opaque grey at their tip. The gill plume is composed of three large and highly branched elements the same colour as the body.
Buccal mass: The buccal mass is muscular with a moderately enlarged buccal pump on the dorsal surface. Inside the anterior portion of the mass is a pair of well-developed jaws. The jaws contain two to three rows of rounded, stubby jaw elements (Fig. 15A). The radular formula of the holotype is 44–45 × 1.0.1 (Fig. 15B). The older teeth (Fig. 15C) are much smaller than the newer ones (Fig. 15D) and the older teeth have proportionately larger denticles than the newer ones. The radula widens gradually towards the more newly developed teeth. The teeth bear numerous relatively evenly graded, short denticles with the smallest ones being found on the inner edge of the tooth. There are approximately seven to 15 denticles on the inner side of the much larger, wide primary cusp and one denticle on the outer side of the cusp. The older teeth have fewer denticles than the more recently developed ones.
Reproductive system: The mature reproductive system is triaulic (Fig. 16A). The narrow pre-ampullary duct enters the saccate ampulla at the distal portion of the ampulla, adjacent to the post-ampullary duct. The ampulla narrows again at the post-ampullary duct and divides into the short, narrow oviduct, which enters the female gland mass, and the vas deferens. The vas deferens gradually widens into the thick prostatic portion. At its proximal end, the vas deferens abruptly narrows into a short, thin ejaculatory segment, which again widens into the elongate, tubular penial sac.The penial sac terminates adjacent to the vagina. The vagina is relatively long and narrow throughout most of its entire length, except at the short, wider portion at the distal end where it joins with the penial sac. It has one short loop near its proximal end. The vagina enters the base of the large, spherical bursa copulatrix adjacent to the receptaculum duct. The receptaculum duct curves and enters the base of the smaller, spherical receptaculum seminis. The uterine duct emerges from the receptaculum duct near the base of the receptaculum and enters the female gland mass. The female gland mass is composed of the large mucous gland and the smaller albumen and membrane glands.
Remarks: This species is compared to the four other members of its species complex above. Despite the fact that this species is genetically distinct in the COI gene from other members of its species complex of four species and has distinct morphological features, it is known from only one preserved specimen. For that reason, we have not described this species until living specimens have been found and variation is better established.
description: Published as part of Smirnoff, Dimitri S., Donohoo, Samantha A. & Gosliner, Terrence M., 2022, Extra-branchial processes manifest extra diversity: systematics of the genus Trapania (Nudibranchia: Goniodorididae) and nine new species descriptions, pp. 270-313 in Zoological Journal of the Linnean Society 196 on pages 300-302, DOI: 10.1093/zoolinnean/zlac009, http://zenodo.org/record/7037746