Bathyarca inaequisculpta

Bathyarca inaequisculpta
	Bathyarca inaequisculpta (from Locard, 1898: plate 13, fig. 25–28 = Arca dakarensis Locard , 1898; synonym of Bathyarca inaequisculpta )
Systematics
Order :	Arcida
Superfamily :	Arcoidea
Family :	Ark clams (Arcidae)
Subfamily :	Bathyarcinae
Genre :	Bathyarca
Type :	Bathyarca inaequisculpta
Scientific name
	Bathyarca inaequisculpta
	( EA Smith , 1885)

Bathyarca inaequisculpta is a species of mussel from the family of ark mussels (Arcidae) in the order Arcida .

features

The slightly unevenly inflated housing reaches a size of 8.5 millimeters (maximum diameter). In outline, it forms an only slightly shifted three-quarter circular arc with a long straight dorsal edge. The case is roughly as long as it is high. The left flap is significantly larger than the right flap, which sits in the left flap. The powerful vortex sits almost in the middle of the longitudinal extent of the housing, only slightly in front of the middle. The rear housing part is therefore only slightly longer than the front housing part. The eddies stand out prominently. Seen from above, the dorsal field is narrow and flat. The front, ventral and rear margins form a large, broad arch. The dorsal edge and front edge form a flat angle, the dorsal and rear edge are also flat-angled, but a little flatter than the front angle. The inner edge of the larger left flap is slightly serrated, while the inner edge of the right flap is smooth.

The lock is taxodont, the lock plate is curved. The teeth are arranged in two groups in the front and rear part of the lock plate. In the front part there are five diverging teeth, in the rear part there are also five teeth, but they are almost parallel to the dorsal margin. The duplivincular ligament shows angular structures that emanate from the posterior part of the dorsal field.

The whitish skin is thin but not fragile. The ornamentation consists of numerous concentric low ridges that are crossed by numerous radial lines. The radial elements are more prominent on the smaller right valve. The thin, straw-yellow periostracum is peeling off easily and the bristles are too short. is mostly only preserved at the edge and in the rear part of the case, and is drawn out into dense, brown and short hairs between the fine ribs. The anterior sphincter is slightly smaller than the posterior sphincter.

Geographical distribution, habitat and way of life

The species is distributed throughout the Atlantic. It occurs there at greater depths from around 2000 meters to over 5000 meters of water. She lives half buried and pinned in mud with a few threads of linen. The sexes are separate. The eggs measure 130 µm in diameter.

Taxonomy

The species was first described in 1885 by Edgar Albert Smith as Arca inaequisculpta . Today it is assigned to the genus Bathyarca . MolluscaBase lists two synonyms Arca dakarensis Locard, 1898 and Bathyarca abyssorum Verrill & Bush, 1898.

supporting documents

literature

Fritz Nordsieck: The European sea shells (Bivalvia). From the Arctic Ocean to Cape Verde, the Mediterranean Sea and the Black Sea. 256 p., Gustav Fischer Verlag, Stuttgart 1969 (p. 22/3)
G. Oliver & JA Allen: The Functional and Adaptive Morphology of the Deep-Sea Species of the Arcacea (Mollusca: Bivalvia) from the Atlantic. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, 291 (1045): 45-76, London 1980, JSTOR 2395365 .

On-line

Marine Bivalve Shells of the British Isles: Bathyarca inaequisculpta (EA Smith, 1885) (website of the National Museum Wales, Department of Natural Sciences, Cardiff)

Individual evidence

^ Arnould Locard: Expéditions scientifiques du Travailleur et du Talisman pendant les années 1880, 1881, 1882 et 1883 . Volume 4, Part 2 Mollusques testacés. Pp. 1–515, plates 1–18, Paris, Masson 1898. Online at www.biodiversitylibrary.org (p. 321) plate. 13
^ Edgar Albert Smith: Lamellibranchiata. In C. Wyville Thomson & John Murray (Eds.): Report on the Scientific Results of the Voyage of HMS Challenger during the Years 1873-76 , Zoology, Vol. 13, Part XXXV, 341 S., London, 1885.
↑ ^a ^b MolluscaBase: Bathyarca inaequisculpta (EA Smith, 1885)
^ Addison Emery Verrill, Katherine J. Bush: Revision of the Deep-Water Mollusca of the Atlantic Coast of North America, with Descriptions of New Genera and New Species. Part I.- Bivalvia. Proceedings of the United States National Museum, 20: 775- Washington, 1898 Online at www.biodiversitylibrary.org (p. 843) [Tab. 76]

Web links

Commons : Bathyarca inaequisculpta - collection of images, videos and audio files

Bathyarca abyssorum Verrill & Bush, 1898, holotype in the United States National Museum, USNM 78793

[Locard1898-1] Arnould Locard: Expéditions scientifiques du Travailleur et du Talisman pendant les années 1880, 1881, 1882 et 1883 . Volume 4, Part 2 Mollusques testacés. Pp. 1–515, plates 1–18, Paris, Masson 1898. Online at www.biodiversitylibrary.org (p. 321) plate. 13

[Smith1885-2] Edgar Albert Smith: Lamellibranchiata. In C. Wyville Thomson & John Murray (Eds.): Report on the Scientific Results of the Voyage of HMS Challenger during the Years 1873-76 , Zoology, Vol. 13, Part XXXV, 341 S., London, 1885.

[MolluscaBase-3] MolluscaBase: Bathyarca inaequisculpta (EA Smith, 1885)

[Verill/Bush1898-4] Addison Emery Verrill, Katherine J. Bush: Revision of the Deep-Water Mollusca of the Atlantic Coast of North America, with Descriptions of New Genera and New Species. Part I.- Bivalvia. Proceedings of the United States National Museum, 20: 775- Washington, 1898 Online at www.biodiversitylibrary.org (p. 843) [Tab. 76]