A ten-faced hexangulaconulariid from Cambrian Stage 2 of South China

Abstract Hexangulaconulariids (Cambrian stages 1–2) are an extinct group of medusozoan polyps having a biradially symmetrical, fan-shaped periderm that is distinct from those of medusozoan polyps showing three-, four-, five-, or six-fold radial symmetry. Hexangulaconulariids exhibit substantial variation in gross morphology, including variation in the number of faces on each of the two major sides of the periderm. An intermediate taxon of hexangulaconulariids with ten faces (five on each major side) was expected. Here we describe a new hexangulaconulariid, Decimoconularia isofacialis new genus new species from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) in the Three Gorges area of Hubei Province, China. The new taxon differs from other hexangulaconulariids (Arthrochites, Hexaconularia, and Septuconularia) mainly in possessing a total of ten faces. The two lateral margins are each marked by a ridge in about the apertural half of the periderm and by a collinear furrow in about the apical half, while the five faces on each major side are bounded by a furrow in about the apertural half and by a collinear ridge in about the apical half. Among hexangulaconulariids, Decimoconularia and Septuconularia may be more closely related to each other than either genus is to Arthrochites or Hexaconularia. UUID: http://zoobank.org/ca270a3b-25ee-4d1f-bdeb-91a963370e70

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A fourteen-faced hexangulaconulariid from the early Cambrian (Stage 2) Yanjiahe Formation, South China

Journal of Paleontology ◽

10.1017/jpa.2019.56 ◽

2019 ◽

Vol 94 (1) ◽

pp. 45-55

Author(s):

Junfeng Guo ◽

Jian Han ◽

Heyo Van Iten ◽

Xing Wang ◽

Yaqin Qiang ◽

...

Keyword(s):

New Genus ◽

Adult Stage ◽

Radial Symmetry ◽

Sensu Stricto ◽

Juvenile Stage ◽

Evolutionary Relationships ◽

Early Cambrian ◽

Three Gorges ◽

The Three Gorges ◽

Facial Midline

AbstractExtant medusozoans (phylum Cnidaria) are dominated by forms showing tetraradial symmetry, but stem-group medusozoans of early Cambrian age collectively exhibit tetra-, bi-, penta-, and hexaradial symmetry. Moreover, the developmental and evolutionary relationships between four-fold and other types of radial symmetry in medusozoans remain poorly understood. Here we describe a new hexangulaconulariid, Septuconularia yanjiaheensis new genus new species, from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) in the Three Gorges area of Hupei Province, China. The laterally compressed, biradially symmetrical periderm of this species possesses 14 gently tapered faces, the most of any hexangulaconulariid described thus far. The faces are bordered by longitudinal ridges and crossed by short, irregularly spaced transverse ribs. Longitudinally, the periderm consists of three regions that probably correspond, respectively, to an embryonic stage, a transient juvenile stage, and a long adult stage. Septuconularia yanjiaheensis may have been derived from six-faced Hexaconularia (Fortunian Stage), which is morphologically intermediate between Septuconularia yanjiaheensis and Arthrochites. Furthermore, conulariids sensu stricto, carinachitids, and hexangulaconulariids may constitute a monophyletic group united by possession of an organic or organophosphatic periderm exhibiting longitudinal (corner) sulci, a facial midline, and offset of transverse ribs along the facial midline.UUID: http://zoobank.org/01a972aa-aef3-4eef-a9a5-c2d8c3dda615

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A new genus and species of anophthalmous Otiorhynchini from Greece, with a new synonymy and new combinations (Coleoptera: Curculionidae, Entiminae)

Zootaxa ◽

10.11646/zootaxa.4938.1.3 ◽

2021 ◽

Vol 4938 (1) ◽

pp. 69-84

Author(s):

CESARE BELLO’ ◽

ENZO COLONNELLI ◽

LEONARDO FORBICIONI ◽

GIUSEPPE OSELLA ◽

ENRICO RUZZIER

Keyword(s):

Type Species ◽

New Genus ◽

New Taxon ◽

New Combinations ◽

Unique Combination ◽

Distinctive Pattern ◽

New Genus And Species ◽

Lateral Margins ◽

New Synonymy

A new genus of Entiminae, an endogean weevil of the tribe Otiorhynchini, Giavarhynchus Bellò, Osella & Ruzzier, gen. n., and its type species Giavarhynchus amicorum Bellò, Osella & Ruzzier, sp. n. are described. The new taxon is readily distinguished from all other members of the tribe due to the unique combination of lack of eyes, elongate rostrum with a ventral transverse furrow and excised lateral margins located at apical third, punctation of pronotum of two distinct sizes arranged in a distinctive pattern, interval 7 of elytra protruding from base of pronotum and crenulate basally, metafemora bearing a spine-like tooth much larger than that of pro- and mesofemora, female tibiae granulate on inner margin, bisinuous mesotibiae. The following synonymy is proposed: Nematocerus Reiche, 1849 (= Cyrtozemia Pascoe, 1872, syn. n.; = Holcorhinosoma Voss, 1939, syn. n.). New combinations are: Nematocerus cognatus (Marshall, 1916), comb. n.; Nematocerus dispar (Pascoe, 1872), comb. n.; Nematocerus pilipes (Morimoto, 2015), comb. n., all from Cyrtozemia; Nematocerus subtuberculatus (Voss, 1939), comb. n. from Holcorhinosoma. New tribal placement is: Pseudocratopus Hustache, 1921 from Otiorhynchini to Peritelini. New subgeneric placement is that of Otiorhynchus deceptorius Białooki, Germann & Pelletier, 2017 and of Otiorhynchus incisirostris Białooki, Germann & Pelletier, 2017 from Otiorhynchus (Lixorrhynchus) Reitter, 1914 to Otiorhynchus (Aranihus) Reitter, 1912.

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Nesaeoduvalius (gen. n.) vailatii sp. n., from Euboia island (Eastern Greece) (Coleoptera: Carabidae, Trechinae)

Fragmenta Entomologica ◽

10.4081/fe.2016.157 ◽

2016 ◽

Vol 48 (1) ◽

pp. 1

Author(s):

Achille Casale ◽

Pier Mauro Giachino

Keyword(s):

New Species ◽

Male Genitalia ◽

New Genus ◽

Morphological Features ◽

New Taxon ◽

Median Lobe ◽

General Shape ◽

Lateral Margins

Nesaeoduvalius (new genus) vailatii Casale & Giachino, new species (Coleoptera: Carabidae: Trechini) is described and illustrated from the Euboia (Evvia) island (eastern Greece). The new taxon belongs to the Duvalius “isotopic” trechine lineage, but is markedly characterized by the peculiar combination of several morphological features in the general shape, chaetotaxy of head, serrate lateral margins of elytra, and features of male genitalia (both in median lobe of aedeagus and endophallus). Its putative position amongst the trechines of the Duvalius phyletic lineage is discussed. Data on the distribution and habitat of this new, insular and unexpected taxon are also provided.

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