Spanglerodessus shorti Miller and Garcia

Miller, Kelly B. & Garcia, Mauricio, 2011, Spanglerodessus shorti and Incomptodessus camachoi, new genera and species of Bidessini from Guyana and Venezuela (Coleoptera: Dytiscidae: Hydroporinae), Zootaxa 2996, pp. 49-56 : 51-52

Spanglerodessus shorti Miller and Garcia , new species

( Figs 1 –6,10,11)

Type locality. Venezuela, Bolivar State, rocky stream along La Escalera, 6°1ʹ38.0"N 61°23ʹ41.1"W, 690m.

Diagnosis. Spanglerodessus shorti is the only member of this genus and is characterized by the diagnostic features of Spanglerodessus . Likely species level diagnostic features include the overall dark brown dorsal coloration with transverse medial yellow-brown region on pronotum ( Fig. 1 ) and the shape of the male genitalia ( Figs 4–6 ). The median lobe is very broad and apically trilobate ( Fig. 4 ).

Description. Measurements. TL = 1.5–1.7 mm, GW = 0.9–1.0 mm, PW = 0.8–0.9 mm, HW = 0.5–0.6 mm, EW = 0.3–0.4 mm, TL/GW = 1.5–1.6. Body broad, robust, globular ( Fig. 1 ); lateral outline discontinuous between pronotum and elytron; lateral margins of pronotum broadly and evenly curved; lateral margins of elytron broadly curved.

Coloration. Head dark brown, pronotum dark brown along posterior half and anterior margin, medial and lateral region yellow-brown; elytron dark brown. Ventral surfaces and appendages red-brown to yellow-brown.

Sculpture and structure. Head with very fine, inconspicuous, irregular punctation, surface between punctures with microsculpture in the form of small, isodiametric cells; eyes medium in size ( Fig. 1 , HW/EW = 1.54–1.61). Pronotal surface similar to that of head; with posterior angles obtuse; lateral bead broad, of even width throughout ( Fig. 1 ); pronotal striae prominent, extending about 1/3 distance across pronotum ( Fig. 1 ). Elytron with anterolateral angle obtuse, not strongly extended anteriorly; surface similar to pronotum. Prosternal process broad, lateral margins subparallel, apex of process broadly rounded, extending to metasternal fork ( Fig. 2 ); metacoxal process with lateral lobe minute but distinct; metaventrite finely, sparsely punctate, metacoxa impunctate, both metaventrite and metacoxae with distinct microsculpture. Pro- and mesotarsi moderately broad in male, slightly narrower in female. Metatrochanter large relative to metafemur ( Fig. 3 ).

Male genitalia. Median lobe in ventral aspect broad, expanded apically with apical margin weakly trilobate ( Fig. 4 ); in lateral aspect slender, straight to ventrally-curved apex ( Fig. 5 ). Lateral lobe in lateral and ventral aspects narrow, broadly curved throughout length, apically narrowly rounded ( Fig. 6 ).

Etymology. This species is named in honor of our good friend and colleague A.E.Z. Short (University of Kansas).

Distribution and habitat. Label data indicate the Guyana specimens were collected in pools in the stream bed at the base of a large waterfall. Other specimens were collected along a rocky stream, and the species is hygropetric ( Figs 12–14 ).

Material examined. HOLOTYPE: ♂ in MIZA labeled, “ VENEZUELA: Bolivar State 6°1ʹ38.0"N 61°23ʹ41.1"W, 690 m Along La Escalera; 31.vii.2008 leg. A.Short, M.Garcia, L.Joly AS-08-059; rocky stream/ [barcode] SM0828289 KUNHM-ENT/ HOLOTYPE: Spanglerodessus shorti Miller and Garcia, 2011 [red label with black line border].” 37 Paratypes ( SEMC specimen numbers SM0828281-SM0828284, SM0828286- SM0828287, SM0828290, SM0828292, SM0827367-SM0827386, SM0827388-SM 082739); 9 labeled same as holotype; 24 labeled same as holotype except “…6°2ʹ10.5"N 61°23ʹ57.8"W, 630m AS-08-058”; 4 labeled, “GUY- ANA Lethem (25kmSE), KumuFalls 3°15.9ʹN 59°43.6ʹW 4Apr1994,PJSpangler/ Collection #14 side pool at base of falls.” Each paratype with label reading, “ PARATYPE: Spanglerodessus shorti Miller and Garcia, 2011 [blue label with black line border].”

Figures

FIGURES 1 – 9. Figs 1 – 6. Spanglerodessus shorti. 1, dorsal habitus, bar = 1.0 mm. 2, prosternal process. 3, right metathoracic leg, ventral aspect. 4 – 6, male genitalia, 4, median lobe and right lateral lobe, dorsal aspect, 5, median lobe, left lateral aspect, 6, left lateral lobe, left lateral aspect. Figs 7 – 9. Incomptodessus camachoi. 7, dorsal habitus, bar = 1.0 mm. 8, male median lobe and right lateral lobe, right lateral aspect. 9, male median lobe, ventral aspect.

FIGURES 11 – 14. Habitats. 11, Spanglerodessus shorti, AS- 08 - 058. 12 – 14, Incomptodessus comachoi; 12, VZ 09 - 0114 - 01 C; 13, VZ 09 - 0112 - 01 B; 14, VZ 09 - 0115 - 01 D. Codes correspond to collection locality codes listed in “ Material examined ” section for each species.