Otinodoris, WHITE, 1948

Valdés, Ángel, 2002, A phylogenetic analysis and systematic revision of the cryptobranch dorids (Mollusca, Nudibranchia, Anthobranchia), Zoological Journal of the Linnean Society 136 (4), pp. 535-636 : 603-607

publication ID

https://doi.org/ 10.1046/j.1096-3642.2002.00039.x

persistent identifier

https://treatment.plazi.org/id/03B5879A-7513-6C09-93DA-FC3F26E6AE26

treatment provided by

Carolina

scientific name

Otinodoris
status

 

GENUS OTINODORIS WHITE, 1948 View in CoL

Otinodoris White, 1948: 203–204 View in CoL . Type species Otinodoris winckworthi White, 1948 , by monotypy.

Diagnosis

Dorsum covered with ramified and elongate tubercles. Head with two flattened oral tentacles. Anterior bor- der of the foot grooved and notched. Labial armature smooth. Radula composed of simple, hamate teeth. Reproductive system with a flattened, granular prostate, having two well differentiated regions. Penis armed with hooks. Vagina devoid of hooks and covered with a cuticular lining. Vestibular or accessory glands absent.

Remarks

White (1948) introduced the genus Otinodoris based on a single preserved specimen collected from Sri Lanka. The specimen was dissected but the reproductive system and the radula were only partially described. No more specimens of this species have been collected since the original description. Externally, Otinodoris winckworthi is characterized by ‘having branched processes on the mantle, ear-like oral tentacles and six branchiae’ ( White, 1948).

Internally, this species has an armed penis and lacks a prostate. Re-examination of the drawings by White (1948) shows that she probably misinterpreted the reproductive system and regarded the prostate as the hermaphrodite gland. The prostate of this animal seems to be large and flattened. The radula has denticulate teeth similar to those of Taringa Er. Marcus, 1955 or Alloiodoris Bergh, 1904 (see Valdés & Gosliner, 2001), but other anatomical features appear to distinguish it from these two genera (presence of penial hooks in Taringa and absence of jaws in Alloiodoris ).

Unfortunately, specimens of Otinodoris winckworthi were not available for the present study.

The examination of material belonging a new species of Otinodoris revealed that this genus shares numerous features with Peltodoris . The main differences between Peltodoris and Otinodoris are the presence or ramified tubercles and flattened oral tentacles in the later. Due to these two synapomorphies of Otinodoris , it is here maintained as a different taxon. According to the phylogenetic analysis carried out in this paper, there is insufficient resolution to determine the relationships between the genera. A more complete analysis, including all the species of both genera, is necessary to determine whether Otinodoris is a synonym of Peltodoris .

OTINODORIS SP.

( FIGS 34B View Figure 34 , 39-41 View Figure 39 View Figure 40 View Figure 41 )

Type material

Off Hotel Soanambo , Île Saint Marie, Madagascar, 5 April 1990, 155 mm preserved length, leg. H. Chaney ( CASIZ 073238 ) .

External morphology

The background colour of the living animals is sandy yellow ( Fig. 34B View Figure 34 ). The dorsum is covered with large, irregular brown and opaque white patches of different sizes and shapes. There is a black spot on top of the longest dorsal tubercles. The rhinophores are pale violet, with a number of irregular white spots. The branchial leaves are also pale violet with white rachises. The anal papilla is white. The whole dorsum is covered with a number of soft, elongate and ramified tubercles of various shapes and sizes ( Fig. 39D View Figure 39 ). Some larger tubercles are randomly distributed among the others. The rhinophoral and branchial sheaths have papillae similar to those on the rest of the dorsum. There are six tripinnate branchial leaves. The anal papilla is situated in the centre of the branchial circle of leaves. The rhinophores are elongate, having 26 lamellae in a 155-mm preserved length specimen.

Ventrally the anterior border of the foot is grooved and notched ( Fig. 40F View Figure 40 ). The oral tentacles are very large and flattened, with an irregular shape.

Anatomy

The posterior end of the glandular portion of the oral tube has six strong retractor muscles ( Fig. 40E View Figure 40 ) which attach to the body wall. The oval, muscular buccal bulb has two large additional muscles attached; two long salivary glands connect with it at each side of the oesophageal junction. The buccal bulb is longer than the glandular portion of the oral tube. The labial cuticle is smooth. The radular formula is 41 ¥ 76.0. 76 in a 155-mm preserved length specimen. Rachidian teeth are absent. The inner lateral teeth are hamate and lack denticles ( Fig. 39A View Figure 39 ). The teeth from the middle portion of the half-row are larger than those closer to the medial portion of the radula ( Fig. 39B View Figure 39 ). The outermost teeth are smaller and also lack denticles ( Fig. 39C View Figure 39 ). The oesophagus is long and connects directly to the stomach.

The ampulla is very long and folded ( Fig. 40C View Figure 40 ). It branches into a short oviduct and the prostate. The oviduct enters the female gland mass near to its centre. The prostate is large and flattened ( Fig. 40B View Figure 40 ). It has two different portions that are clearly distinguishable in colour and texture. The prostate connects with a long duct that expands into the ejaculatory portion of the deferent duct. The penis is armed with large hooks ( Fig. 41A View Figure 41 ) and covered by a hard cuticle. The muscular deferent duct opens into a common atrium with the vagina. The vagina is very long and convoluted, internally covered with a cuticular lining ( Fig. 41B View Figure 41 ). At its proximal end it joins the large and irregular bursa copulatrix. From the bursa copulatrix leads another duct connecting to the uterine duct and the seminal receptacle. The bursa copulatrix is about 10 times as large as the elongate seminal receptacle. The seminal receptacle is elongate and granular.

In the central nervous system ( Fig. 40D View Figure 40 ) the cerebral and pleural ganglia are fused and distinct from the pedal ganglia. The cerebral and pleural ganglia are entirely covered with large ganglionic tubercles. There is one cerebral nerve leading from the left cerebral ganglion and two from the right one, and three pleural nerves leading from each pleural ganglion. There is no separate abdominal ganglion on the right side of the visceral loop. The buccal ganglia are near to the rest of the central nervous system, joined to the cerebral ganglia by two relatively long nerves. Gastrooesophageal, rhinophoral and optical ganglia are present. The pedal ganglia are clearly separated, having two nerves leading from each one. The pedal and parapedal commissures are enveloped together with the visceral loop.

The circulatory system ( Fig. 40A View Figure 40 ) consists of a large heart and two blood glands situated in front of and behind the central nervous system.

Remarks

White’s (1948) original description of Otinodoris winckworthi includes very little information, but two features she described for this species (the presence of denticulate lateral teeth and auriculated oral tentacles), clearly distinguishes it from the species studied here, which has smooth teeth and lacks auriculated oral tentacles.

Otinodoris sp. clearly belongs to the genus Otinodoris by having flattened oral tentacles and the dorsum covered with long and ramified tubercles.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Nudibranchia

Family

Discodorididae

Loc

Otinodoris

Valdés, Ángel 2002
2002
Loc

Otinodoris

White KM 1948: 204
1948
Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF