In 1991, Landemaine erected a new genus (and family) to include certain Cretaceous and Paleogene (aschersoni-gafsana-koerti lineage) Cretalamna-like teeth that displayed asymmetrical lateral cusplet groups and a weak nutrient groove. This determination has not been universally accepted; for example, Cappetta (2006) accepts the Cretaceous determination but continues to include the Paleogene lineage as "Cretolamna". Kent (1994) adopted Serratolamna for lerichei teeth (followed by; however, Cappetta & Nolf (2005) deemed lerichei to be an odontaspid and erected Brachycarcharias for these teeth. At this time (2007), includes lerichei in Brachycarharias based on Cappetta & Nolf (2005); this may or may not be a correct determination. Cappetta (2006) provided no arguments to support his determination that the aschersoni-gafsana-koerti lineage should be included in Cretalamna and can only reject this "proclamation".

Three species have been reported from Mid-Atlantic, Gulf Coast and Interior Seaway sediments:

  • Serratolamna serrata (AGASSIZ 1843) is a Late Cretaceous species known from the Maastrichtian of: New Jersey (Case et al 2001), Maryland (Hartstein & Decina 1986), North Carolina (Case 1979), Arkansas (Beker et al 2006), Texas (Welton & Farish. 1993), South Dakota (Beker et al 2004) and North Dakota (Hoganson et al 1995). In addition, serrata was included in the Campanian of: New Jersey (Robb 2004) and Alabama (Shimada & Brereton (2007).
  • Serratolamna gafsana (WHITE 1926). Case (1994:114) reported "Cretolamna" aschersoni (STROMER 1905) from the Late Palaeocene/Early Eocene of Mississippi while Kent (1994:53) included this tooth-design as Serratolamna from the Eocene of the Chesapeake region; it would appear that these teeth may in fact be S. gafsana (see below).
  • Serratolamna koerti (STROMER 1910). Case (1981:58-59) erected Lamna twiggsensis for a tooth-design from the Eocene of Georgia; these teeth are identical to Serratolamna koerti and can only be viewed as a junior synonym of the latter.

    The teeth from this genus can be best characterized as being an asymmetrical Cretalamna-type tooth with multiple cusplets. The crowns are smooth with a complete cutting edge. One to three cusplets are present with distal cusplets often outnumbering mesial. The roots have a V-shaped basal margin, weak nutrient groove and distinct foramen. In general, the cusp is an elongated triangle that is distally directed (anterior teeth are nearly erect).

    Welton & Farish (1993: 112) included a lateral tooth identified as S. serrata which looks very much like those of Lamna biauriculata maroccana ARAMBOURG 1935 and is unlike other teeth of Serratolamna. This is possibly an ontogenetic variation; however this design is symmetrical with a significantly broader, shorter and erect cusp. (ref. Cretalamna maroccana illustration).

    Uncommon in Nanjemoy (Eocene) exposures are the large teeth of Serratolamna gafsana. These have been often incorrectly identified in the past (including on this page) due to their identification as aschersoni in Case (1994). David Ward (pers. com. 1998), when confirming Steve Cunningham's (pers. com. 1998) suggestion that these might represent S. gafsana, noted that the illustrations in Arambourg (1952) clearly show that the teeth of aschersoni have a shallow root and "bizarre" lateral cusplets. David went on to note that juvenile S. gafsana teeth are Carcharias-like with multiple lateral cusps, fine striations on the labial face.

    Relatively Common in the Castle Hayne (Lutetian & Bartonian) sediments of North Carolina are the teeth of S. koerti; these teeth appear equally abundant in comparable horizons of other southeastern states extending into Texas. Although present in the Chesapeake Bay area, they are scarce.


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