PBDB Taxon

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Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Cerithiopsis llajasensis

Gastropoda - Cerithiopsidae

Taxonomy

Cerithiopsis llajasensis was named by Squires (1984). Its type specimen is LACMIP 6515 and is a 3D body fossil. Its type locality is CSUN Loc. 371 - Santa Susana Mountains [Llajas Fm], which is in a Ypresian/Lutetian offshore sandstone in the Llajas Formation of California.

Sister species lacking formal opinion data

C. albovitalum, C. alveolata, C. bicolor, C. columna, C. exilis, C. fayalensis, C. galapagensis, C. grippi, C. halia, C. lata, C. lottae, C. maresi, C. minima, C. pseudomanzonii, C. quadrilirata, C. regularicostata, C. sohli, C. trigeminata, C. unisulcata

Synonymy list

Year	Name and author
1984	Cerithiopsis llajasensis Squires p. 20 figs. Figures 6n-o

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Gastropoda

Rank	Name	Author
subclass	Caenogastropoda	(Cox 1959)
—	Sorbeoconcha	(Ponder and Lindberg 1997)
—	Hypsogastropoda	(Ponder and Lindberg 1997)
superfamily	Triphoroidea	Gray 1847
family	Cerithiopsidae	Adams and Adams 1853
genus	Cerithiopsis	Hanley 1849
species	llajasensis

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.

†Cerithiopsis llajasensis Squires 1984

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Diagnosis

Reference	Diagnosis
R. L. Squires 1984	species of Cerithiopsis characterized by te- leoconch sculpture of four to five primary spiral ribs crossed by equal-strength collabral costae, with nodes at the inter- sections. The varices are irregularly spaced. Cerithiopsis llajasensis n. sp. is similar to C. orovillensis Dickerson (1916:489-490, pl. 39, fig. 7) from Eocene strata in northern California. C. llajasensis differs from the holo- type of C. orovillensis in the following features: larger, a more elongate-slender shape, equal strength spiral and collabral sculpture, four to five rather than only four primary spiral ribs on the teleoconch whorls, equal-strength primary spiral ribs, less nodose sculpture, more varices, and an absence of two strong spiral keels above the base of the body whorl. Cerithiopsis llajasensis n. sp. is similar also to C. excelsus Dall (1909:7 5, pl. 3, fig. 9) from Eocene strata in southwestern Oregon. Givens (1974) regarded C. excelsus as C. excelsum (Dall). C. llajasensis differs from the holotype of C. excelsum in the following features: suture more adpressed, absence of a shoulder on the whorls, equally spaced collabral sculpture, fewer primary spiral ribs, equal-strength primary spiral ribs, many more varices, and more swollen varices. The cancellate sculpture of C. llajasensis is equal in strength over the shell whereas in C. excelsum this is not the case. C. excelsum has two prominent spiral ribs and unequally spaced collabral sculpture, thereby producing an uneven cancellate sculpture.

Measurements

No measurements are available

Composition:

aragonitec

Locomotion:

actively mobilef

Life habit:

epifaunalf

Diet:

carnivoref

Vision:

limitedc

Created:

2009-09-10 08:29:25

Modified:

2009-09-10 10:29:25

Source: f = family, c = class

References: Kiessling 2004, Hendy et al. 2009

Age range: base of the Ypresian to the top of the Lutetian or 56.00000 to 41.30000 Ma

Collections (7 total)

Time interval	Ma	Country or state	Original ID and collection number
Ypresian	56.0 - 47.8	USA (California)	Cerithiopsis llajasensis (177611)
Ypresian - Lutetian	56.0 - 41.3	USA (California)	Cerithiopsis llajasensis (type locality: 8011 8018 200144)
Lutetian	47.8 - 41.3	USA (California)	Cerithiopsis llajasensis (201698 201700 207161)