A new species of Bolboceratidae from Mexico, Bolbelasmus (Bolbelasmus) quinquestriatus
n. sp., is described and illustrated. The elytra of the new species present five striae between the humeral ...callus and the elytral suture, a character that is considered diagnostic for the genus Eucanthus. Based in this condition, Eucanthus is proposed as a subgenus of Bolbelasmus. An updated identification key and photographs of related species are provided.
Heterosternus galindorum
new species (Coleoptera: Scarabaeidae: Rutelini) from the state of Puebla, Mexico, is described and illustrated. Keys to identify males of Heterosternus Dupont with ...photographs, a comparative table of morphological characters, and a distribution map of the genus are provided.
http://www.zoobank.org/urn:lsid:zoobank.org:act:2E9E6DB2-8C29-4B87-8317-61CDAD0E586C
The endemic Mexican genus Lamoana Casey, 1915 stat. rev. is revalidated through a comparative morphological analysis of both male genitalia and somatic characters of all genera with perpendicular ...parameres. A comparative study and general description of the basic patterns in the morphology of the genitalia for the American genera are provided. A full redescription of the genus and a redescription of L. villosella (Blanchard, 1851) comb. rev. is provided herein, with the addition of generic and specific diagnostic characters and data about its geographical distribution. Further, possible relationships at generic level among American genera are provided. With this study, the number of Anomalini genera known for America and Mexico is now elevated to 17 and 14, respectively.
Morphological variations of Macrobrachium tenellum prawns from two populations from locations in the Copalita and Colotepec riverine basins in the seashore of Oaxaca, Mexico, were studied with ...geometric morphometry techniques. The purpose was to find and explain significant differences in shape and size between the cephalothorax and the rostrum. Differences between sexes and populations were intended to prove intra and inter-populations. Results suggest low intrapopulation differences but significant interpopulation variation between specimens from different places, while a regression analysis suggests a higher correlation between shape and size only in males. The higher differences in places between and within sexes could be explained due to differences in environmental pressure. A positive allometry bias in males could indicate a sexual selection mechanism affecting mating.
Two new species of Disteniidae are described from Oaxaca, Mexico: Distenia (Distenia) toledoi
sp. n. and Elytrimitatrix (Grossifemora) chimalapensis
sp. n. Distinguishing characters from closely ...related species are given and discussed. New state records are provided for Distenia (Basisvallis) rugiscapis Bates, 1885; Disteniazteca fimbriata (Lacordaire, 1869); and Elytrimitatrix (Grossifemora) sauria Santos-Silva & Hovore, 2008. A complete checklist of species recorded in Mexico is provided.
urn:lsid:zoobank.org:pub:72EEEF0A-4259-4B50-96FA-73FD0374BD5C
Results of an aquatic beetle survey at Volcán Tacaná, Mexico, are presented with five altitudinal levels in a monthly sampling regime, aiming to estimate both diversity and altitudinal distribution ...patterns of the aquatic beetle fauna. The first list of aquatic beetle species from this mountain is presented, comprising 40 species in 32 genera and nine families, with four species recorded for the first time from Mexico and six recorded for the first time from Chiapas. The aquatic beetle fauna is characterized by Elmidae with 20 species, Dytiscidae with eleven species, Dryopidae with three, and Epimetopidae, Hydraenidae, Hydrophilidae, Gyrinidae, Lutrochidae, and Noteridae with one species each. The species composition through the sampled altitudinal gradient (670-1,776 m) was not homogeneous, with the elmid genera
,
,
, and
present at all levels, while
,
, and
were present at levels 1-3 (673-1,214 m); dytiscids were mostly present at levels 4 and 5 (1,619-1,776 m), and dryopids were present only at levels 1-3. A Parsimony Analysis of Endemicity supports a general partition between altitudinal levels 1-3 and levels 4 + 5.
