The New World species of the water‐beetle genus Notomicrus (Noteridae)*

Abstract

Eight species of Notomicrus Sharp are recognized and described or partially redescribed with figures of dorsal outlines and external male genitalia: brevicomis Sharp, gracilipes Sharp, huttoni sp.n., malkini sp.n., nanulus (LeConte), reticulatus Zimmermann, sharpi Balfour‐Browne, traili Sharp. A key for identification is given, but the main reliance for recognition of the species is on the external male genitalia. New distribution records are given for all species.

On the systematics of Noteridae (Coleoptera: Adephaga: Hydradephaga): Phylogeny, description of a new tribe, genus and species, and survey of female genital morphology

“…Although not specifically included in the analysis by Beutel et al (2006), they did discuss many of the character states exhibited by Speonoterus and placed it as sister to Notomicrus. These are among the smallest of all water beetles with some Notomicrus about 1.0 mm in total length and none over 2.0 mm (Young, 1978). They are primarily tropical with representatives in southeastern North America, much of South America, Australia and Southeast Asia.…”

Figure 1 from: Baca SM, Short AEZ (2021) Review of the New World Notomicrus Sharp (Coleoptera, Noteridae) I: Circumscription of species groups and review of the josiahi group with description of a new species from Brazil. ZooKeys 1025: 177-201. https://doi.org/10.3897/zookeys.1025.60442

“…Fortunately, males of most individual species of the meizon group are easy to identify by their aedeagi in combination with other characters, such as tarsal claws. The male median lobes of the meizon group species are usually (but not always) very irregularly shaped (for example, see Young 1978 andGuimarães andFerreira-Jr 2019). The aedeagus of most species of the traili group appear similar to Fig.…”

“…1.0 mm and 1.8 mm. Following Young (1978), size can, in combination with other characters, be very helpful in species determination. Size is quantified in terms of (1) total length (TL), as measured from anterior margin of head to apex of elytra, in dorsal aspect, (2) total length without head (TLPn), measured from medial anterior margin of pronotum to elytral apex (this is included to provide a consistent length measurement, as the degree to which the head is ventrally reflexed can affect the TL measurement) and…”

“…The pro-and mesotarsal claws of males of Notomicrus show significant interspecific variation in size and shape. Following Young (1978), the shape of the claws, as well as the relative sizes of the anterior claws and posterior claws can be helpful in diagnosing species. Here we describe and illustrate the claws in lateral view (Figs 8,9).…”

Prionohydrus, a New Genus of Noterini Thomson (Coleoptera: Noteridae) from South America with Three New Species and Its Phylogenetic Considerations

“…Many South American noterids, in particular, are poorly known and rather speciose (Nilsson 2005) despite being quite common in many aquatic habitats and frequently collected in large numbers. However, only a few of the genera occurring in the Neotropics have been revised since first being described: Notomicrus Sharp by Young (1978), Suphisellus Crotch north of Colombia by Young (1979), and Suphis Aubé by Grosso (1994). In addition, Young (1985) presented a key to the species of American Hydrocanthus Say.…”