Carcineretidae

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Cladus: Pancrustacea
Superclassis: Multicrustacea
Classis: Malacostraca
Subclassis: Eumalacostraca
Superordo: Eucarida
Ordo: Decapoda
Subordo: Pleocyemata
Infraordo: Brachyura
Sectio: Eubrachyura
Subsectio: Heterotremata
Superfamilia: Portunoidea

Familia: †Carcineretidae
Genera: †Branchiocarcinus – †Cancrixantho – †Carcineretes – †Mascaranada
Name

Carcineretidae Beurlen, 1930b
References

Beurlen, K., 1930b: Vergleichende Stammesgeschichte Grundlagen, Methoden, Probleme unter besonderer Berücksichtigung der höheren Krebse. Fortschrifte in der Geologie und Paläontologie, 8: 317–586.

Carcineretidae is a prehistoric family of heterotrematan crustaceans. They are only known from Cretaceous fossils. These crabs are tentatively placed in the superfamily Portunoidea and resemble the swimming crabs (Portunidae) in having some paddle-shaped pereiopods. But it is not certain that this placement is correct, as the Carcineretidae also show some similarities to the Matutidae of superfamily Leucosioidea and the Goneplacidae of superfamily Xanthoidea.[1]
Description

Their carapace is usually wider than long and of square or ovate shape. Its epibranchial region is bulbous, and it bears at least one transverse ridge in the protogastric, hepatic or branchial region. Unlike in the living Portunoidea, the front (the part of the carapace above the head) is narrow; it bears a few blunt spines in some species. The hind part of the carapace is also narrowed, tapering from just behind the eyes. Around the eyes, also atypical for portunoideans, the carapace makes a wide curve and is beset with spines and notches.[1]

The chelipeds are quite robust – more so than the second to fifth pereiopods – and in some the manus is keeled on the outside. Each "paddle" is formed by the flattened propodus and dactyls of the fourth and/or fifth pereiopods.[1]

At least in males, the first and second sternite are fused, with no suture visible. The suture between sternites 2 and 3 is conspicuous and deep, the one between sternites 3 and 4 incomplete. The eighth sternite is not visible from below. The abdominal of males is narrow, with (probably) completely free somites, and the first to fourth abdominal somite entirely fill the space between the coxae of the fifth pereiopods.[1]
Genera

Four genera are recognised in the family Carcineretidae:[2]

†Branchiocarcinus Vega, Feldmann & Sour-Tovar, 1995
†Cancrixantho Van Straelen, 1934
†Carcineretes Withers, 1922
†Mascaranada Vega & Feldmann, 1991

References

Hiroaki Karasawa; Carrie E. Schweitzer (2006). "A new classification of the Xanthoidea sensu lato (Crustacea: Decapoda: Brachyura) based on phylogenetic analysis and traditional systematics and evaluation of all fossil Xanthoidea sensu lato". Contributions to Zoology. 75 (1/2): 23–73. Archived from the original (PDF) on 2016-03-03. Retrieved 2008-11-23.
Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109. Archived from the original (PDF) on 2011-06-06.