Hintonelmis anamariae, Fernandes, André S., Passos, Maria Inês S. & Hamada, Neusa, 2010

Fernandes, André S., Passos, Maria Inês S. & Hamada, Neusa, 2010, A new species of Hintonelmis Spangler (Coleoptera: Elmidae: Elminae) from Central Amazonia, Brazil, Zootaxa 2353, pp. 43-48 : 44-47

Hintonelmis anamariae sp. nov.

( Figs. 1–9 )

Diagnosis. Hintonelmis anamariae sp. nov. can be distinguished from all other species in the genus by the combination of the following characteristics. 1) Pronotum ( Fig. 1 ) dark brown with anteromedial portion yellowish brown. 2) Elytra ( Fig. 1 ) dark brown; each elytron with two oval, yellowish brown, patches - one larger patch extending diagonally from umbo to second stria at the basal 1/5, and one smaller oval medial patch at apical 2/5. 3) Antennae ( Figs. 1, 2 ) yellowish brown, with basal 3/4 of last segment dark brown. 4) Parameres ( Figs. 7, 8 ) elongate; in dorsal view ( Fig. 7 ), continually narrowed to apex, apex acute; in lateral view ( Fig. 8 ), continually narrowed and curved to venter beginning at 1/3 posterior; anterior 1/10 continually spatulated; apex truncate. 5) Median lobe ( Figs. 7, 8 ) longer than parameres; in dorsal view ( Fig. 7 ), continually narrowed to apex, apex subacute; in lateral view ( Fig. 8 ), curved and narrowed from anterior 1/8 to apex; apex rounded.

Description. Holotype: male ( Figs. 1–3 , 5–8 ). Length 2.28 mm, greatest width 0.81 mm. Body ( Figs. 1, 2 ) elongate, subparallel; surface with punctures 1/2 to 2/3 the diameter of eye facets and usually separated by about twice their diameter; dorsum sparsely covered with fine, recumbent and pale setae, except scutellum; venter covered with longer and sparser setae than dorsum, with plastron present.

Color ( Figs. 1–4 ): Cuticle shining and dark brown except as follows: antennae yellowish brown, with basal 3/4 of last segment dark brown; labrum with anterior margin yellowish brown; pronotum with anteromedial portion yellowish brown; each elytron with two oval, yellowish brown patches: one larger, extending diagonally from umbo to second stria at basal1/5, and the other smaller, on medial portion of the apical 2/5; medial 1/6 of elytral apex with rectangular and longitudinal paler patch; venter; mouth-parts and legs yellowish brown. Head ( Figs. 1, 2 ): Without distinct impressions; frontal margin slightly emarginated. Eyes protuberant; laterally rounded; separated by a distance 3/2 times wider than eye. Antennae 11 segmented; long and slender; last segment swollen and twice as long as the segment 10. Frontclypeal suture present between bases of antennae. Clypeus slightly broader and shorter than labrum; anterior margin slightly emarginated; lateral angles broadly rounded. Labrum rectangular; anteromedial portion slightly emarginated; anterolateral angles rounded, with numerous long and pale hairs. Maxillary palpus with four segments; last segment flattened, twice as broad as second segment and longer than the other segments combined. Labial palpus with three segments; last segment flattened, three times wider than second segment.

Thorax ( Figs. 1, 2 , 5 ): Pronotum ( Fig. 1 ) longer than wide; one sublateral carina, on each side, present on basal third but in some specimens hardly distinguishable; impressions (oval, on medial area of pronotal disc; transverse, on anterior 2/5, extending between lateral margins; and oblique, between pronotal half and posterior margin); anterior portion narrower than posterior portion; anterior angles broadly rounded; anterior margin broadly convex, arcuately extended over base of head; posterior angles, slightly produced, acute; posterior margin with three arches, two broad, one on each side in front of the elytron, and one narrow in front of scutellum. Elytra ( Fig. 1 ) subparallel; about three times as long as pronotum; third interval feebly convex at base, anterior margin convex; humeral angle broadly rounded; apex moderately extended and truncated; each elytron with two sublateral carinae, one on the basal half (inner, on sixth interval) and the other on the apical half (outer, on eighth interval); lateral margins crenate; disc with punctures separated by twice their diameters, punctures half as wide as intervals between striae. Scutellum ( Fig. 1 ) slightly convex; barely longer than wide; subpentagonal, with angles rounded. Prosternum ( Figs. 2 , 5 ) with anterior margin concave, wider than posterior margin; prosternal process subquadrate, wider than long, extending slightly beyond anterior coxae, posterior margin with rounded medial angle, broader than lateral angles. Mesosternum ( Fig. 2 ) wider than prosternum, 1/3 as long; posterior margin concave, wider than anterior margin. Metasternum ( Fig. 2 ) with median, longitudinal, sulcus on posterior 4/5; anterior margin convex; posteromedial area sinuate, acute; posterior portion in front of coxae with pair of transverse arched sulci. Legs ( Fig. 2 ) long; pro- and mesocoxae globular; tibiae with distinct apical fringes of tomentum, two fringes (anterior and posterior sides) on the front and middle tibiae and only one fringe (posterior side) on the hind tibiae.

Abdomen ( Figs. 2–4 ): Sternum 1 ( Fig. 2 ) with anterior portion obtusely angulated between posterior coxae; without discal carinae. Sternum 5 ( Fig. 2 ) with clasp at posterolateral angles; long setae extending beyond posterior margin. Spicule ( Figs. 3 , 6 ) half as long as abdomen; anterior portion subacute, curved until basal 1/5; curved bifurcation starting on anterior half; posterior arms gradually narrow and divergent.

Genitalia ( Figs. 7, 8 ): Parameres ( Figs. 7, 8 ) elongate; in dorsal view ( Fig. 7 ) continually narrowed to apex, apex acute; in lateral view ( Fig. 8 ) continually narrowed and curved to venter beginning at posterior 1/3; anterior 1/10 continually spatulate; apex truncate. Median lobe ( Figs. 7, 8 ) about 1/4 longer than parameres; in dorsal view ( Fig. 7 ) continually narrowed to apex, apex subacute; in lateral view ( Fig. 8 ) curved and narrowed from anterior 1/8 to apex; apex rounded.

Plastron: Present on the genae, the anterior part of the hypomera, the epipleura, the pro-, meso- and metasternal episternae, the sides of the metasternum, most of the abdomen, (except the medial area of the first three sternites), the coxae, the trochanters, the femora (except for the distal 3/4 of the dorsal side), and the tibiae (except for the dorsal side).

Female. Externally similar to male.

Abdomen ( Fig. 4 ): Spicule as long as 3/4 of the length of the abdomen; anterior portion rounded; bifurcation starting on anterior 2/7; posterior arms parallel, diverging and curved only on posterior 1/9.

Genitalia ( Fig. 9 ): Coxites with 1/2 the length of the styli; in dorsal view: about two times longer than wide. Styli elongate; in dorsal view: basal segment narrowed from base until the apical 1/5; apex of each basal segment truncate and with two small cylindrical sensillae on the apical surface; apical segment narrow, cylindrical and with 1/5 the length of the basal segment.

Intraspecific variation. Size range (n=14): length 2.16–2.52 mm, greatest width 0.72–0.78 mm. Color: little variation in the size of the patches on elytra; little variation in cuticle tonality. The specimens examined did not have significant morphological variation.

Morphological notes. Through the translucent abdominal sternites it is possible to see the shape of the spicule (which differs between male and female). This technique helps avoid extraction of the genitalia (which, in many cases, causes the destruction of parts of the bodies of these minute specimens) to distinguish the gender.

Type locality. Brazil, Amazonas State (AM), Presidente Figueiredo Municipality, Igarapé da Onça stream, Sossego da Pantera, km 20, Amazonas State Highway 240 (AM 240), 02º02'S, 59º50'W.

Type series. Holotype: Male, ‘Presidente Figueiredo, AM, Igarapé da Onça, Sossego da Pantera, km 20, AM 240, A. M. O. Pes leg. 4–5/09/2000 blacklight Pennsylvania trap, Coleção de Invertebrados ( INPA). Paratypes: 6 females, same data as holotype, Coleção de Invertebrados ( INPA); 3 males, same data as holotype except ‘ 3-5/08/2000 ’, Coleção de Invertebrados ( INPA); 2 males, same data as holotype, Coleção Entomológica José Alfredo Pinheiro Dutra ( UFRJ); 2 females, same data as holotype, Coleção Entomológica José Alfredo Pinheiro Dutra ( UFRJ).

Habitat notes. The type series was collected with light traps placed by a second-order stream with a bedrock streambed in a fragment of terra firme (upland) forest in northern Brazil. Since no specimens of H. anamariae sp. nov. were found in our collections in the streams in the region, we cannot be sure of the habitat of the species. However, species in the genus Hintonelmis are usually found on submerged decaying woody debris deposited in rapids, a type of microhabitat found in abundance at the original type series locality.

Etymology. The species epithet, anamariae , is in honor of Dr. Ana Maria O. Pes (Instituto Nacional de Pesquisas da Amazônia, Amazonas, Brazil) in recognition of her contribution to the knowledge of aquatic insects in Amazonia.

Figures

FIGURES 1 – 4. Hintonelmis anamarie, sp. n. (1) Dorsal habitus. (2) Ventral habitus. (3) Male abdomen showing spicule. (4) Female abdomen showing spicule.

FIGURES 5 – 9. Hintonelmis anamarie, sp. n. (5) Prosternal process. (6) Male spicule. (7) Male genitalia (dorsal). (8) Male genitalia (lateral). (9) Female genitalia (dorsal).