Caenis binda, Suter & Mynott & Webb, 2023

Suter, Phillip J., Mynott, Julia H. & Webb, Jeff M., 2023, The first record of Caenis Stephens, 1835 in Australia (Ephemeroptera: Caenidae) with descriptions of two new species, Zootaxa 5228 (4), pp. 477-488 : 478-479

Caenis binda n. sp.

( Figure 5c , 6 )

urn:lsid:zoobank.org:act:BCE71B49-68E7-4316-87E5-45E25F23759F

Tasmanocoenis Sp H in part, Suter 1999a

Type Material (Deposited in the Queensland Museum). Holotype: Male imago on slide. Queensland (Qld), Freshwater Creek by Crystal Cascades caravan park off Redlynch Intake Road ; 16.5833E, 145.6978S; 3 July 2008; coll. JM Webb (JMW), JH Hawking (JHH), PS, S. Moore (SM); LaTrobe University (LTU) accession no. JWA712a ; T258326. Paratypes: 2 male imagoes on slides details as for holotype LTU accession no. JWA712b–c; T258327 and T258328 ; 1 male imago in ethanol, Granite Creek at Mareeba to Mt Malloy Road ; 16.9847E, 145.4192S; 1 July 2008; JMW, JHH, PS, SM; LTU accession no. JWA1718; T258329 ; 1 male imago in ethanol Freshwater Creek by Crystal Cascades caravan park off Redlynch Intake Road ; 16.5833E, 145.6978S; 26 June 2008; JMW, JHH, PS, SM ; University ( LTU) accession no. JWA1728; T258330 ; 1 male imago in ethanol Babinda Creek at A1 ( Bruce Highway ); 17.3643E, 145.9156S; 27 June 2008; JMW, JHH, PS, SM ; LTU accession no. JWA1706; T258331 .

Other Material Examined. One male imago, Queensland. Freshwater Creek by Crystal Cascades caravan park off Redlynch Intake Road; 16.5833E, 145.6978S; 3 July 2008; JMW, JHH, PS, SM ; LaTrobe University ( LTU) accession no. JWA1601. One male imago, Granite Creek at Mareeba to Mt Malloy Road ; 16.9847E, 145.4192S; 1 July 2008; JMW, JHH, PS, SM ; LTU accession no. JWA1719. One male imago, Freshwater Creek by Crystal Cascades caravan park off Redlynch Intake Road; 16.5833E, 145.6978S; 3 July 2008; JMW, JHH, PS, SM ; LaTrobe University ( LTU) accession no. JWA1727. One male imago, Babinda Creek at A1 (Bruce Highway); 17.3643E, 145.9156S; 27 June 2008; JMW, JHH, PS, SM ; LTU accession no. JWA1705. One male imago, Babinda Creek at A1 (Bruce Highway); 17.3643E, 145.9156S; 27 June 2008; JMW, JHH, PS, SM ; LTU accession no. JWA1707. One male imago, Granite Creek at Mareeba to Mt Malloy Road ; 16.9847E, 145.4192S; 1 July 2008; JMW, JHH, PS, SM ; LTU accession no. JWA1717. 1 male imago. Lacey’s Creek at Cassowary Road (El Arish Mission Beach Road); 17.8512E, 146.0644S; 2 July 2008; JMW, JHH, PS, SM ; LTU accession no. JWA1726.

Diagnosis. C. binda can be characterised by the following combination of characters. In the male: body length 1.7–1.8 mm; base of antennal flagellum not dilated ( Fig. 6c, 6d ); penes with median concavity and lobes broad, rectangular ( Fig. 6b ) styliger plate length 0.6 times width ( Fig. 6b ); lateral sclerite short, narrow, triangular ( Fig. 6b ); forceps long and narrow, tapering from base to apex, 5.8 times longer than mid width ( Fig. 6c ); forceps with five apical bristles with one very long, three mid length and one short ( Fig. 6c ); forceps length 2–3 times longer than longest apical bristle; abdomen lacking lateral processes and femora with apical dark marking.

Description

Male Imago (n=6): Body Length 1.7–1.8 mm; wing length 1.6–1.9 mm; terminal filament length 3.8–4.3 mm. Head: Base of antennae not dilated; pedicel 1.4–1.8 x longer than scape, flagellum length 0.4–0.5 mm ( Fig. 6d, e ). Prosternum triangular with straight lateral sides, apex broadly rounded ( Fig. 5c ). Legs slender and delicate; forelegs longer than mid and hind legs; tarsomeres of fore tarsus apically not broadened, fore tarsal claws similar, both blunt and ovoid ( Fig. 6g ); mid and hind tarsal claws dissimilar one blunt and one slender, curved and sharp. Tarsal segment formula of foreleg 2, 4, 3, 5, 1. Femora of legs with dark apical elongate spot ( Fig. 6f ). Foreleg femur 0.31–0.44 mm long, tibia 1.4–1.5 x femur length, tarsus 1.1–1.4 x femur length. Mid leg length 0.34–0.36 mm, tibia 0.7–0.8x femur length, tarsus 0.4–0.5x femur length. Hind femur length 0.34–0.36 mm, hind tibia 0.7 x femur length, hind tarsus 0.5–0.7 x femur length. Scutellum broad, posteriorly with indentation, broadly rounded. Wings 2.0–2.2 x longer than wide ( Fig. 6a ), with hind margin lined with long hairs which are longest in anal and cubital region and short in radial region. Abdomen without markings on sternites, sternites VI–VIII lacking lateral filaments. Penis with median concavity and each lobe rectangular. Forceps long, broad, tapering from base to apex and straight ( Fig. 6c ), not curved; 2–3 x longer than longest apical spine length; at base 3 x longer than wide, at mid length 5.8 x longer than wide, at apex 11.2 x longer than wide with tuft of five apical spines, one very long and three approx. half-length of longest spine and 1 very short; surface covered with long setae/hairs. Three terminal filaments 3.8–4.3 mm long.

Nymph unknown.

Etymology. From the traditional owners’ (the Yidinji people) name ‘binda’ meaning waterfall as a description of the ‘Cascades’ on Freshwater Creek near Cairns, Queensland (www.cairnsconnect.com accessed 22 September 2022).

Figures

FIGURE 5. a, Caenis hanleyi n. sp. prosternum of male imago; b, enlarged photo of prosternum arrowed; c, C. binda n. sp. prosternum of male arrowed; d, C. hanleyi nymphal gill IV; e, ornamentation on head; f, enlarged detail of tubercles on frons; g, ornamentation on mesonotum; h, enlarged detail of tubercles on pronotum; i, ornamentation on 2nd gill. Scale lines a, c, d, e, g = 0.12mm; b, f, h, i = 0.03mm.

FIGURE 6. Caenis binda n. sp., male imago. a, wing, markings at margins show extent of hairs along the posterior margin; b, genitalia; c, forceps showing apical bristles; d, antenna; e pedicel and scape of antenna; f, femur of foreleg; g, fore tarsus. Scale lines, a, d, f, g = 0.2 mm; b, c, e = 0.1 mm.