没什么好图，分类
镇楼
吧

ABSTRACT
Sigilmassasaurus brevicollis is an enigmatic theropod dinosaur from the early Late
Cretaceous (Cenomanian) of Morocco, originally based on a few isolated cervi-
cal vertebrae. Ever since its original description, both its taxonomic validity and
systematic affinities were contentious. Originally considered to represent its own
family, Sigilmassasauridae, the genus has variously been suggested to represent a
carcharodontosaurid, an ornithischian, and, more recently, a spinosaurid. Here we
describe new remains referrable to this taxon and re-evaluate its taxonomic status
and systematic affinities. Based on the new remains, a re-evaluation of the original
materials, and comparisons with other spinosaurids, the holotype of Sigilmassas-
aurus brevicollis is identified as an anterior dorsal, rather than a cervical vertebra,
anddifferencesbetweenelementsreferredtothistaxoncanbeexplainedbydifferent
positions of the elements in question within the vertebral column. Many characters
used previously to diagnose the genus and species are found to be more widespread
among basal tetanurans, and specifically spinosaurids. However, the taxon shows
severalautapomorphiesthatsupportitsvalidity,includingthepresenceofastrongly
rugose, ventrally offset triangular platform that is confluent with a ventral keel ante-
riorly in the mid-cervical vertebral centra and a strongly reduced lateral neural arch
lamination, with no or an incomplete distinction between anterior and posterior
centrodiapophyseal laminae in the posterior cervical and anterior dorsal vertebrae.
We argue furthermore that Spinosaurus maroccanus, also described on the basis of
isolated cervical vertebrae from the same stratigraphic unit and in the same paper
as Sigilmassasaurus brevicollis, is a subjective synonym of the latter. Both a detailed
comparison of this taxon with other theropods and a formal phylogenetic analysis
support spinosaurid affintities for Sigilmassasaurus. However, we reject the recently
proposed synonymy of both Spinosaurus maroccanus and Sigilmassasurus brevicollis
with Spinosaurus aegyptiacus from the Cenomanian of Egypt, as there are clear dif-
ferences between the vertebrae of these taxa, and they do not share any derived
character that is not found in other spinosaurids. Together with a comparison with
otherspinosauridvertebralmaterialfromtheKemKem,thissuggeststhatmorethan
one taxon of spinosaurid was present in the Kem Kem assemblage of Morocco, so
the referral of non-overlapping material from this unit to a single taxon should be
regardedwithcaution.

一些论文截图

早年间由于斯基玛萨龙的化石较少，分类一直有争议。甚至被视为无效属。不过在2013年的重新评估中，认为斯基玛萨龙属于坚尾龙类。2015年，通过对斯基玛萨龙的新标本已经结合旧标本的研究，得出斯基玛萨龙属于棘龙科，与棘龙属关系较近。这么看来，KEM组极度丰富的水产品资源，在这种环境中能孕育出多种棘龙科完全能在意料之中，不过这也意味着棘龙将面对更加艰苦的生存环境，比起鲨齿龙，巴哈利亚龙，三角洲奔龙等，斯基玛萨龙才是棘龙的主要竞争对手。
另外指的一提的是，这次将MSNM4047作为了一个单独的分支列了出来，不知道文章中有没有详细说明。这是否意味着MSNM4047将脱离棘龙属，成为一个新的属种呢？

插一下楼，这是补充材料：A reappraisal of the morphology and systematic position of the theropod dinosaur Sigilmassasaurus from the “middle” Cretaceous of Morocco 连接：https://peerj.com/articles/1323/

Spinosaurus, and MSNM V4047, the character definition is not applicable to the morphology of the teeth, see discussion in Data S1
这句啥意思

顶一个！