Ptilomyax hadalis
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Ptilomyax hadalis |
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| Scientific name | ||||||||||||
| Ptilomyax hadalis | ||||||||||||
| Oliver , 2012 |
Ptilomyax hadalis is a type of mussel from the lentil mussel family(Montacutidae). The species lives commensally with the sea urchin Pourtalesia heptneri in the Banda trough (Indonesia) and has been detected in a water depth of approx. 7340 m. It is the type and only species of the genus Ptilomyax Oliver, 2012.
features
The juvenile , very small case is single-sided, approximately egg-shaped in outline and only slightly extended forward. It is thus unequal to the vertebra a little behind the center (the total length). It measures 2.5mm in length and 1.9mm in height. The adult housing is unevenly lobed, the dorsal edges of the right valve are drawn out wing-shaped ( alat ) and overlap over the dorsal edge of the left valve. The "wings" form a pronounced lateral sinus with the front and rear edges . The front and rear edges are broadly rounded, the front edge slightly thicker than the rear edge. The ventral margin is widely curved. The front part of the inner ventral margin has a series of ribs that are transverse to the margin and are evenly spaced. The vertebrae are slightly prosogyrat. The ligament is very small, behind the vertebra and deeply sunk. The dorsal margin has a thickened periostracum that functions like a ligament. The lock plate has not yet been examined. The surface is almost smooth with growth strips parallel to the edge. The Prodissoconch I measures 105 μm. The Prodissoconch II is 265 μm long and has fine growth lines parallel to the edge.
The edge of the mantle is largely not overgrown. It has a large opening for the foot at the lower front end, while the opening for the water flowing out is small. The gills are bent semi-feather gills that are fused with the coat at the end of the gill axis. The byssus consists of many thin threads that are concentrated in bundles. The anterior and posterior sphincters are roughly the same size and ovoid in cross-section. There are anterior and posterior muscles of the foot. The mouth lobes are small. The foot has a well-formed “toe”, a flat sole and a stepped “heel”.
Geographical distribution, habitat and way of life
The species is so far only known from the type locality in the Banda trough off Indonesia ( ). The 18 copies were from the Russian research vessel RV Vityaz on 21./22. March 1975 dredged in 7,340 to 7,335 meters water depth (station 7271) (leg. Alexandr N. Mironov).
The species is commensally associated with the sea urchin Pourtalesia heptneri , which lives in the deep sea .
Taxonomy
The taxon was first described in 2012 by P. Graham Oliver. The material was made available to him by AN Mironov.
supporting documents
literature
- P. Graham Oliver: Taxonomy of some Galeommatoidea (Mollusca, Bivalvia) associated with deep-sea echinoids: A reassessment of the bivalve genera Axinodon Verrill & Bush, 1898 and Kelliola Dall, 1899 with descriptions of new genera Syssitomya gen. Nov. and Ptilomyax gen. nov. European Journal of Taxonomy, 12: 1–24, 2012, doi : 10.5852 / ejt.2012.12