Desmopachria gyrationi Miller and Wolfe, 2018

Miller, Kelly B. & Wolfe, G. William, 2018, Nine New Species in the Desmopachria nitida Species-Group of the Neotropical Genus Desmopachria Babington, 1841 (Coleoptera: Adephaga: Dytiscidae: Hydroporinae: Hyphydrini), The Coleopterists Bulletin 72 (1), pp. 97-112 : 103

Desmopachria gyrationi Miller and Wolfe , new species

Zoobank.org/ urn:lsid:zoobank.org:act:37298130-AAEC-4243-8097-2960027CB63A ( Figs. 12–14 , 69 )

Type Locality. Guyana, Region IX, Ziida Karisihizi (lake), nr Kusad Mts. , large vegetated marsh, 2°49.793ʹ N, 59°48.361ʹ W, 123 m.

Diagnosis. This species is unique in the shape of the male genitalia. The male median lobe in lateral aspect is medially expanded and bent, with the apex slender and straight apically ( Fig. 12 ). In ventral aspect, the median lobe is broad basally, abruptly narrow sub-basally and thereafter with the margin evenly curved to the narrowly bifid apex ( Fig. 13 ). The lateral lobe is also characteristic with the apex deeply bifid, the ventral lobe apically broadly narrowed, and the dorsal lobe apically spinous in lateral aspect ( Fig. 14 ). The male genitalia are not especially similar to any other species. The head and pronotum are evenly yellow, and the elytron is evenly orange without maculae. Specimens are moderately large for the genus (TL = 1.7–1.8 mm). The male median lobe is most similar to that of Desmopachria nitida Babington , but that species has the apex sinuate ( Fig. 53 ) instead of straight ( Fig. 12 ).

Description. Measurements: TL = 1.7–1.8 mm, GW = 1.1–1.2 mm, HW = 0.6 mm, EW = 0.3 mm, TL/GW = 1.5, HW/EW = 2.0. Coloration: Head and pronotum yellow. Elytron orange, somewhat darker than pronotum. Ventral surface orange, somewhat lighter yellow-orange on head appendages, prosternum, and pro- and mesolegs. Male genitalia: Male median lobe in lateral aspect slender, elongate curved, apical portion broadly angulate medially, apically slender with apex narrowly rounded ( Fig. 12 ). Median lobe in ventral aspect broadly expanded basally, apically with lateral margins broadly convergent to apex comprised of slender fork ( Fig. 13 ). Lateral lobe in lateral aspect moderately slender, apically deeply divided into 2 long rami, ventral ramus apically rounded, somewhat expanded; dorsal ramus spinous, slender, apically sharply pointed ( Fig. 14 ); in ventral aspect slender, apices of rami narrowly rounded.

Variation. There is little variation in coloration or other features among the specimens examined.

Etymology. This species is named gyrationi after an unbelievable dance move as well as the whirling swimming behavior of members of Desmopachria .

Distribution. This species is known only from southwestern Guyana ( Fig. 69 ).

Habitat. Specimens were collected from “large side pools of main river,” a “marshy area,” a “vegetated pond,” a “stagnant vegetated creek,” a “heavily vegetated marsh,” “creek margins,” a “large vegated marsh,” and a “large shallow lagoon/marsh.”

Type Material. Holotype in CSBD, male labeled, “ GUYANA: Region IX 2°49.793ʹN, 59°48.361ʹW, 123m Ziida Karisihizi (lake), nr Kusad Mts., large vegetated marsh leg. Short, Isaacs, salisbury 25.x.2013; GY13-1025-01A/ SEMC1273486 KUNHM-ENT [label with barcode]/ HOLOTYPE Desmopachria gyrationi Miller and Wolfe, 2017 [red label with black line border].” Paratypes: Twelve labeled same as holotype except with different specimen barcode labels and each with “… PARATYPE Desmopachria gyrationi Miller and Wolfe, 2017 [blue label with black line border];” three labeled “ GUYANA: Region IX 2°49.724ʹN, 59°48.546ʹW, 121m Ziida Wao Creek, nr. Kusad Mts. Stagnant vegetated creek leg. Short, Isaacs, Salisbury 26.x.2013; GY13-1025-02A/…” and barcode and paratype labels; five labeled “ GUYANA: Region IX 2°51.193ʹN, 59°56.338ʹW, 117m nr. Kusad Mts., muddy margins of vegetated farm ponds leg. A. Short: 28.x.2013 GY13-1026-02A/…” and barcode and paratype labels; six labeled “ GUYANA: Region IX 2°49.724ʹN, 59°45.546ʹW, 121m Ziida Wao Creek, nr. Kusad Mts. Stagnant vegetated creek leg. Short, Isaacs, Salisbury 25.x.2012; GY13-1025-02A/…” and barcode and paratype labels; 21 labeled “ GUYANA: Region IX 2° 50.955°N, 58°58.253W, 115m nr. Kusad Mtns., vegetated pond leg. Short,Isaacs,Salisbury 27. x.2012; QY13-1027-02A/…” and barcode and paratype labels; 14 labeled, “ GUYANA: Region IX 2°52.204ʹN, 59°55.002ʹW, 124m nr. Kusad Mts., marshy area leg. Short,Isaacs,Salisbury 27. x.2012; GY13-1027-01A/…” and barcode and paratype labels. Specimen catalog numbers are in Table 1 .

Figures

Figs. 1–32. Male genitalia of Desmopachria species in the D. nitida species-group. D. curseenae: Median lobe – 1) Right lateral aspect; 2) Ventral aspect; Right lateral lobe – 3) Right lateral aspect; 4) Ventral aspect. D. delongi: Median lobe – 5) Right lateral aspect; 6) Ventral aspect; Right lateral lobe – 7) Right lateral aspect; 8) Ventral aspect. D. gingerae: Median lobe – 9) Right lateral aspect; 10) Ventral aspect; 11) Right lateral lobe, right lateral aspect. D. gyrationi: Median lobe – 12) Right lateral aspect; 13) Ventral aspect; 14) Right lateral lobe, right lateral aspect. D. hardyae: Median lobe – 15) Right lateral aspect; 16) Ventral aspect; 17) Right lateral lobe, right lateral aspect. D. kemptonae: Median lobe – 18) Right lateral aspect; 19) Ventral aspect; Right lateral lobe – 20) Right lateral aspect; 21) Ventral aspect. D. lloydi: 22) Median lobe, ventral aspect; 23) Apices of median lobe, anterior aspect; Right lateral lobe – 24) Right lateral aspect; 25) Ventral aspect. D. singhae: Median lobe – 26) Right lateral aspect; 27) Ventral aspect; 28) Right lateral lobe, right lateral aspect. D. vohrae: Median lobe – 29) Right lateral aspect; 30) Ventral aspect; Right lateral lobe – 31) Right lateral aspect; 32) Ventral aspect.

Figs. 69–70. Distribution of Desmopachria species in the D. nitida species-group. 69) D. delongi, D. gyrationi, and D. kemptonae; 70) D. gingerae and D. hardyae.

Figs. 52–68. Male genitalia of Desmopachria species in the D. nitida species-group. D. nitida, redrawn from Young (1986): 52) Aedeagus, ventral aspect; 53) Apex of median lobe, right lateral aspect; 54) Right lateral lobe, right lateral aspect. D. nitidoides, redrawn from Young (1990a): 55) Aedeagus, ventral aspect. D. phacoides, redrawn from Guignot (1950): 56) Median lobe, ventral aspect; 57) Right lateral lobe, ventral aspect. D. psarammo, redrawn from Miller (1999): Aedeagus – 58) Dorsal aspect; 59) Right lateral aspect. D. rhea, redrawn from Miller (1999): Median lobe – 60) Dorsal aspect; 61) Ventral aspect; 62) Right lateral aspect; Lateral lobe – 63) Right lateral aspect; 64) Ventral aspect. D. subnotata, redrawn from Young (1986): 65) Aedeagus, ventral aspect; 66) Right lateral lobe, right lateral aspect. D. zelota, redrawn from Young (1990a): Aedagus – 67) Dorsal aspect; 68) Right lateral aspect.