PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Pycnogryphaea

Bivalvia - Ostreida - Gryphaeidae

Taxonomy

Pycnogryphaea was named by Kosenko (2018). Its type is Gryphaea weberae.

It was assigned to Pycnodonteinae by Kosenko (2018).

Species

P. weberae

Synonymy list

Year	Name and author
2018	Pycnogryphaea Kosenko p. 772

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Bivalvia
—	Eubivalvia
subclass	Autobranchia	(Groblen 1894)
infraclass	Pteriomorphia	(Beurlen 1944)

Rank	Name	Author
—	Ostreomorphi	Ferussac 1822
—	Ostreioni	Ferussac 1822
—	Ostreata	Ferussac 1822
superorder	Ostreiformii	Ferussac 1822
order	Ostreida	(Fërussac 1822)
suborder	Ostreidina	(Ferussac 1822)
superfamily	Ostreoidea	(Rafinesque 1815)
family	Gryphaeidae	Vialov 1936
subfamily	Pycnodonteinae	Stenzel 1959
genus	Pycnogryphaea

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Pycnogryphaea Kosenko 2018

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†Pycnogryphaea weberae Yanin and Tschelzova 1969

Diagnosis

Reference	Diagnosis
I. Kosenko 2018	Shell medium-sized, strongly inequivalve and thick. Left valve gryphaeoid, strongly convex with well-defined posterior sulcus and posterior flange, right valve flat or slightly concave. Outlines triangular or subtriangular. Attachment area very small. Left valve umbo prominent, rising well above hinge line. Both valves with concentric growth squamae, right valve with weak antimarginal grooves. Left valve lacks umbonal cavity. Ligament area triangular with triangular resilifer. Posterior adductor scar located posterodorsally, rounded (gryphaeate). Quenstedt muscle scar well distinguishable on right valve, located ventrally from resilifer. Commissural shelf narrow, well-defined, delimited by circumferential curb. Chomata developed all along the circumferential curb. Elongated chomata located near ligament area, simple lath chomata developed below elongated chomata.

Measurements

No measurements are available

Composition:

low Mg calcitef

Environment:

marine, brackisho

Locomotion:

stationaryf

Attached:

yesf

Life habit:

epifaunalf

Diet:

suspension feederf

Vision:

blindc

Created:

2007-09-26 08:05:58

Modified:

2009-08-18 19:34:53

Source: f = family, o = order, c = class

References: Aberhan et al. 2004, Steuber 2002, Kiessling 2004

Age range: base of the Berriasian to the top of the Late/Upper Berriasian or 143.10000 to 137.05000 Ma

Collections (6 total)

Time interval	Ma	Country or state	Original ID and collection number
Late/Upper Tithonian - Early/Lower Berriasian	145.06 - 141.0	Ukraine	P. weberae (240846)
Berriasian	143.1 - 137.05	Ukraine	Gryphaea weberae (240845) P. weberae (240848)
Berriasian	143.1 - 137.05	Ukraine (Crimea)	P. weberae (240847)
Late/Upper Berriasian	139.1 - 137.05	Ukraine	P. weberae (214153 240849)