First described species of Costacopluma (Crustacea: Brachyura: Retroplumidae) from the Pacific slope, Paleocene of California, USA

Abstract

A new species of the brachyuran crab Costacopluma Collins and Morris, 1975, Costacopluma squiresi, is described from lower Paleocene strata of the San Francisquito Formation and upper Paleocene strata of the Santa Susana Formation of southern California. Costacopluma squiresi represents the first described species of Costacopluma from the Pacific Coast of North America.

Archaeochiapasidae n. fam., a new early Cenomanian brachyuran family from Chiapas, Mexico, new hypothesis on Lecythocaridae Schweitzer & Feldmann, 2009, and phylogenetic implications (Crustacea, Decapoda, Brachyura, Eubrachyura)

“…34) examined its morphology, in particular its genital region; the thoracic sternum is wide, with parallel and interrupted sutures 4/5-7/8 in extant members as in fossil genera such as Costacopluma Collins & Morris, 1975(Fig. 17) (Fraaije et al 2006Nyborg et al 2009: fig. 4) or fossil Retropluma Gill, 1894(Hyžný et al 2015Gašparič & Križnar 2017: fig.…”

Decapoda (Crustacea) of the Coon Creek Formation (Maastrichtian) of Mississippi and Tennessee

“…Branchiocarcinus was also originally assigned to Carcineretidae by Feldmann and Vega (1995), but was not included in the revision of Carcineretidae by Schweitzer et al (2007). It was later reassigned to the Carcineretidae by Schweitzer et al (2010) , Lithophylax cornatus (Vega, Feldmann and Sour-Tovar, 1995); Lithophylax xestos (Bishop, 1988); Lithophylax pacificus new designation (Nyborg et al, 2014).…”

Documenting the Paleontological Resources of National Park Service Areas of the Southern California Coast and Islands

“…Microbial limestones (Hoots 1931, Mack 1993) and crabs (Fig. 6;Squires 1980, Nyborg et al 2009) are among the more unusual fossils of the Paleocene rocks found in and around the eastern part of the recreation area, which is also the source of several new species of mollusks (Tweet et al 2012). …”

“…In addition to the dedicated SAMO inventory (Koch et al 2004), there have been other notable publications, including (1) several papers on Cretaceous and Paleocene mollusks that include SAMO specimens (Squires and Saul 2006, 2007, 2009); (2) more work on the Middle Cenozoic mammals, summarized by Lander (2011); (3) a description of the Conejo Volcanics invertebrates (Stanton and Alderson 2013); (4) a publication including Zuma Creek fossils of the extinct Californian Turkey Meleagris californica (Bocheński and Campbell 2006); and (5) the description of 2 new invertebrates from specimens found within SAMO: the crab Costacopluma squiresi (Nyborg et al 2009) and the gastropod Pyropsis aldersoni (Squires 2011). The enormous size and complex geology of the recreation area ensure that there are many remaining questions to be answered and outcrops to be explored.…”