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Systematics, biogeography and functional morphology ofthe Box Crabs (Family Calappidae)
2002
The box crabs (family Calappidae, H. Milne Edwards 1837) are a morphologically and ecologically distinctive group of marine crabs found in tropical and subtropical regions of the world. Traditionally placed in the section Oxystomata because of their characteristic triangular buccal frame (the 'oxystomatous' condition), they are one of the few brachyuran families capable of burying completely in soft substrata. This study aims to review the systematics of the family and to examine the phylogenetic and functional implications of the oxystomatous condition in an evolutionary and biogeographic framework. The systematic status of the family Calappidae and the phylogenetic relationships of its four component subfamilies were re-evaluated based on a cladistic analysis of 78 adult morphological characters. A single tree was produced (CI = 0.654, RCI= 0.403). The monophyly of the Calappidae sensu lato is rejected. Yet the monophyly of each subfamily is supported, with the Calappinae ...
Larvae of the mangrove fiddler crab Austruca albimana (Kossmann, 1877), hatched from an ovigerous female collected from the mangroves of Sumariat, Jazan Province, Saudi Arabia in the southern Red Sea, were reared in the laboratory. Four zoeal and a megalopal stages were recorded, and their morphological features are described herein for the first time. The setations of the cephalothoracic appendages of the zoeas of A. albimana and their congeners exhibit several variations that help differentiate larvae of this genus easily from other meroplankton. However, a character of phylogenetic significance-minute spines on the forks of the telson of pleon-is common to larvae of this genus. These minute spines were studied with the aid of scanning electron microscope images. There were five common morphological features between A. albimana and other fiddler crab megalope, including Minuca burgersi, Leptuca uruguayensis and Leptuca thayeri. These features were a deflexed front, rounded to obtuse frontal margin, sevensegmented antennal flagellum, unsegmented endopod of maxilla and three cincinnuli on the endopods of pleopods. Two zoeal morphological features described in this study and other studies (i.e., the absence of lateral spines on carapace [vs. their presence in species of Uca, Afruca and Ocypode in the Ocypodinae] and the presence of a maximum of four pairs of inner setae on the telson of pleon [vs. presence of more than four pairs of setae in species of Uca, Afruca and Ocypode]) support the taxonomic amendment of transferring Uca spp. and Afruca spp. crabs from Gelasiminae to Ocypodinae.
Revista Mexicana de …, 2012
primitivos. Un nuevo género, Viaia n. gen. (tipo: Viaia robusta n. sp.), cercano al género Heeia, permite la comparación con material francés e inglés y el registro de una nueva familia, Viaiidae n. fam., basándose en caracteres claramente diferenciadores, en particular una peculiar cavidad en las porciones laterales del caparazón. Se describe y justifica también un nuevo género y especie asignado a la familia Homolidae, Navarrahomola hispanica n. gen. n. sp. Los dos nuevos géneros están estrechamente relacionados con decápodos registrados en capas del Albiano-Cenomaniano del sur Inglaterra y norte de Francia, lo que contribuye a confirmar importantes implicaciones biogeográficas en las áreas mencionadas en ese tiempo.
Artal et al.398 New Albian-Cenomanian crabs (Crustacea, Decapoda, Podotremata) from
2015
Collections made by Máximo Ruiz de Gaona and Luis Via Boada between 1940 and 1982, from the Albian-Cenomanian reefal limestones at Monte Orobe (Navarra, northern Spain), now housed at the Museo Geológico del Seminario de Barcelona together with newly recovered material, have enabled the recognition of two new primitive crabs. A new genus, Viaia n. gen. (type: Viaia robusta n. sp.), is compared to the closely related Heeia from northern France and southern England; both genera are referred to Viaiidae n. fam., which is characterised by clearly distinguishable features, notably a peculiar cavity at the lateral sides of the carapace. A new genus and species of homolid, Navarrahomola hispanica n. gen., n. sp., is also described and discussed. The two new genera are closely related to podotreme crabs IURP$OELDQ&HQRPDQLDQOHYHOV LQVRXWKHUQ(QJODQGDQGQRUWKHUQ)UDQFHZKLFKFRQ¿UPVWKHFORVH biogeographic links between these areas.
Nauplius, 2016
Th e morphology of the fi rst zoeal stage of Domecia acanthophora (Desbonne, in Desbonne & Schramm, 1867) was described from laboratory-hatched material obtained from ovigerous females collected at Vitória Island on the southeastern Brazilian coast. We compared the larval morphology Nauplius BraZIlIan crustacean socIety Nauplius BraZIlIan crustacean socIety orIgInal artIcle This article is part of the special series offered by the Brazilian Crustacean Society in honor to Nilton José Hebling in recognition of his dedication and contributions to the development of carcinology in Brazil. Alves et al. 2 Description of the first zoea of D. acanthophora Nauplius, 24: e2016021 (zoea I) of fourteen species of the superfamily Trapezioidea, which Domecia glabra Alcock, 1899 is the only congeneric representative of the species described in this study. The morphological characteristics of the first zoea that distinguish D. acanthophora from D. glabra are: three aesthetascs on the exopod antennule; three pairs of lateral spines on carapace; bilobed basial endite of maxilla, with four plumodenticulate setae on each lobe; and telson furcae distally spinulated. It also provides information that may enhance some phylogenetic hypotheses within Trapezioidea crabs.
Abstract Abundant fossil material of extinct brachyurans has revealed morphological details hitherto rarely used in palaeontological studies. Detailed comparisons between extant and extinct material have been carried out, with an emphasis on thoracic sternum, abdomen and appendages. Documented for the first time is the unique character of Raninoidea De Haan, 1839, their ‘gymnopleurity’, which is not found in their predecessors, the Palaeocorystidae Lőrenthey in Lőrenthey & Beurlen, 1929. Palaeocorystidae, together with four other families (Camarocarcinidae Feldmann, Li & Schweitzer, 2008; Cenomanocarcinidae Guinot, Vega & Van Bakel, 2008; Necrocarcinidae Förster, 1968 emend.; and Orithopsidae Schweitzer, Feldmann, Fam, Hessin, Hetrick, Nyborg & Ross, 2003a emend.), is assigned here to the superfamily Palaeocorystoidea, of similar rank to Raninoidea. Both Raninoidea and Palaeocorystoidea are afforded a subsection rank and referred to as subsection Raninoidia De Haan, 1839 emend. New or emended diagnoses are provided for all higher taxonomic levels, and all members of Raninoidia are listed in an appendix. A unique abdominal holding structure, the double peg, is described for the first time. Its gradual evolution is documented and the phylogenetic implications are discussed. Comparative morphology of the thoracic sternum, abdominal holding structures, the sternumpterygostome configuration, respiratory physiology and spermathecae, all reveal polarities of the raninoidian clade. The configuration of the sternum with the pterygostome, which is related to body strength and respiratory physiological efficiency, differs significantly between the two superfamilies, Raninoidea showing a derived condition. An evolutionary lineage, leading from Palaeocorystidae, via Lyreididae to Raninidae is recognised, and an intermediate form, Marylyreidus punctatus n. comb., is discussed. Several hitherto unknown structures in extant raninoids, an obstruction system for the abdomen and a telson protection valve, are documented. The cryptic spermathecal apertures of raninoids, so far barely understood, are re-examined and compared to those of palaeocorystoids. The phylogeny of Podotremata, often debated in the recent literature, is discussed anew on the basis of these observations. A position of Raninoidea within Eubrachyura, recently claimed by several authors, cannot be maintained, an observation supported by documentation of the basal condition of Raninoidia. A new basal lyreidid clade, Marylyreidinae n. subfam., is erected, whereas new genera and species include Antonioranina n. gen. (Cyrtorhininae), Bournelyreidus teodorii n. gen., n. sp. (Lyreidinae), Cenocorystes bretoni n. sp. (Palaeocorystidae), Cenomanocarcinus cantabricus n. sp. (Cenomanocarcinidae), Eosymethis aragonensis n. gen., n. sp. (Symethinae), Eucorystes iserbyti n. sp., Eucorystes navarrensis n. sp. (both Palaeocorystidae), Ferroranina tamilnadu n. gen., n. sp. (Palaeocorystidae), Joeranina gaspari n. gen., n. sp. (Palaeocorystidae), Marylyreidus n. gen. (Marylyreidinae n. subfam.), Paranecrocarcinus balla n. sp. (Paranecrocarcininae), Symethoides monmouthorum n. gen., n. sp. (Symethinae) and Vegaranina n. gen. (Ranininae). Several raninoid and palaeocorystoid genera are revised, and emended diagnoses given.