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Pycnactis
Classification
Phylum:
Cnidaria
Class:
Anthozoa
Subclass:
Rugosa
Order:
Stauriida
Suborder:
Lykophyllina
Family:
Lykophyllidae
Formal Genus Name and Reference:
Pycnactis RYDER, 1926, p. 386
Type Species:
Hyppurites mitratus VON SCHLOTHEIM, 1820, p. 352; OD; tin SCHLOTHEIM Coil., HU, E. Berlin; lectotype by LANG, SMITH, & THOMAS, 1940, p. 112
Images
(Click to enlarge in a new window)
Fig. 162,1. *p. mitratus (VON SCHLOTHEIM), God., Swed.;
ext. view, X1 (Hisinger,1831).
Synonyms
Pycnactis
Geographic Distribution
Eu.(God.-U.K)
Age Range
Beginning Stage in Treatise Usage:
Sil.
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Sil.
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Solitary, curved trochoid, with oblique calice; major septa dilated and extending almost to axis; in early stages cardinal septum longer and thicker than others; minor septa very short, dilated; tabulae seldom seen due to dilatation of septa; rare dissepiments may occur in calice only. [Until lectotype is restudied and illustrated, generic name (senstl SMITH, 1945, p. 53) cannot be used with confidence.]
References
Smith, Stanley, , \& Lang, W. D., , \& Ryder, T. A., 1926, The genus Corwenia, gen. nov.: Ann. Mag. Nat. Hist., ser. 9, v. 17, p. 149-159, pl. 5, 6.
Museum or Author Information
Classification
Phylum:
Cnidaria
Class:
Anthozoa
Subclass:
Rugosa
Order:
Stauriida
Suborder:
Lykophyllina
Family:
Lykophyllidae
Formal Genus Name and Reference:
Pycnactis RYDER, 1926, p. 386
Type Species:
Hyppurites mitratus VON SCHLOTHEIM, 1820, p. 352; OD; tin SCHLOTHEIM Coil., HU, E. Berlin; lectotype by LANG, SMITH, & THOMAS, 1940, p. 112
Images
(Click to enlarge in a new window)
Fig. 162,1. *p. mitratus (VON SCHLOTHEIM), God., Swed.;
ext. view, X1 (Hisinger,1831).
Synonyms
Pycnactis
Geographic Distribution
Eu.(God.-U.K)
Age Range
Beginning Stage in Treatise Usage:
Sil.
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Sil.
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Solitary, curved trochoid, with oblique calice; major septa dilated and extending almost to axis; in early stages cardinal septum longer and thicker than others; minor septa very short, dilated; tabulae seldom seen due to dilatation of septa; rare dissepiments may occur in calice only. [Until lectotype is restudied and illustrated, generic name (senstl SMITH, 1945, p. 53) cannot be used with confidence.]
References
Smith, Stanley, , \& Lang, W. D., , \& Ryder, T. A., 1926, The genus Corwenia, gen. nov.: Ann. Mag. Nat. Hist., ser. 9, v. 17, p. 149-159, pl. 5, 6.