Genus Tyloderma

Data on Genus Tyloderma (subtribe Cryptorhynchina, tribe Cryptorhynchchini, subfamily Cryptorhynchinae)

Wikipedia states that there are 30 named species of Cophes worldwide - this number may come from the scientific paper noted below. iNaturalist has Observations for only 9 of those species worldwide, with 7 of the 9 occurring in North America - 130 Observations (121 in the U.S., 8 in Canada, and 1 in Mexico). I have found the top one at a single site in Pennsylvania.

T. foveolatum
T. baridium
T. nigrum
T. sphaerocarpae
T. aquaticum
T. aereum
T. subpubescens

A larger dataset with many more species is found in the Global Biodiversity Information Facility (GBIF) database - 278 North American Observations & Museum-preserved specimens over 32 species.

The BugGuide platform (which only covers the US and Canada), has 17 species:

T. foveolatum
T. baridium
T. nigrum
T. sphaerocarpae
T. aquaticum
T. aereum
T. subpubescens
T. angustulum
T. marshalli
T. lecontei
T. fragariae
T. variegatum
T. circumcaribbeum
T. punctatum
T. aporteae
T. pseudofoveolatum
T. capitale

The following very detailed paper discusses this genus:

"Revision of the New World Weevil Genus Tyloderma in America North of Mexico (Coleoptera: Curculionidae: Cryptorhynchinae), Guillermo J. Wibmer, Department of Florida, The Southwestern Entomologist, Supplement No. 3, May, 1981, pp. 1-95

Abstract

"Thirty species of Tyloderma Say are known to occur in America north of Mexico. A redescription of the genus is provided, and the species are keyed and placed in 10 species groups, which are also defined. Sixteen new species are described...A description or redescription of each species is included, and some important taxonomic characters, including the male phallus, and female 8th sternite and spermatheca are illustrated. Information is presented on host plants, life histories, and natural enemies. Complete distributional records are included and the distributions mapped."

The article notes: "Little biological data are available for most species of Tyloderma. The genus includes terrestrial, semiaquatic and aquatic species...Adult Tyloderma are primarily nocturnal, and large numbers of those associated with semiaquatic vegetation have been obtained by sweeping at night around ponds, lakes, marshes or along roadside ditches...A simple but effective method of obtaining adults during daytime is treading. In those cases where the plants are mainly underwater, the adult weevils tend to hold to the stems and also remain underwater during the daytime but come up at night on the emergent vegetation for a fresh air supply, to feed and to mate. If one pushes the plants down vigorously several times, the weevils release their hold on the stems and surface, where they float or more commonly start swimming...The larvae are usually stem borers that pupate in the stems of the host plants..."

Publicado el 22 de junio de 2021 por kidneymoth