Barretthydrus tibialis Lea, 1927

Alarie, Yves, Michat, Mariano C., Hendrich, Lars & Watts, Chris H. S., 2018, Larval Description and Phylogenetic Placement of the Australian Endemic Genus Barretthydrus Lea, 1927 (Coleoptera: Dytiscidae: Hydroporinae: Hydroporini: Sternopriscina), The Coleopterists Bulletin 72 (4), pp. 639-661 : 645

publication ID

https://doi.org/ 10.1649/0010-065X-72.4.639

DOI

https://doi.org/10.5281/zenodo.5195393

persistent identifier

https://treatment.plazi.org/id/8F69AC09-C70D-FF91-D320-FDDECB6D1706

treatment provided by

Carolina

scientific name

Barretthydrus tibialis Lea, 1927
status

 

Barretthydrus tibialis Lea, 1927 View in CoL

( Figs. 1–14 View Figs View Figs View Figs View Figs , 16–19 View Figs View Figs )

Source of Material. Larvae were collected in association with adults at the following localities: Australia, New South Wales, 20 km North of Nelligan, 15-VIII.1997, coll. C. H. S. Watts; Sardine Creek, 30 km North of Orbost V, 30-XI-1998, C. H. S. Watts leg.

Diagnostic Combination (Instar III). The third instar of B. tibialis can easily be distinguished from that of the closely similar B. geminatus by the presence of a broad, blackish macula on the anterior portion of the frontoclypeus ( Fig. 16 View Figs ) in addition to a relatively shorter head capsule compared to the length of abdominal segment VIII (HL/LAS <4.50 compared to>4.60) and a larger total number of secondary setae on selected leg articles ( Table 3 View Table 3 ).

Instar I

( Figs. 1–12 View Figs View Figs View Figs View Figs )

Description. Color: [Not available owing to the bad state of preservation of the only specimen available.] Body: Measurements and ratios that characterize the body shape in Table 1 View Table 1 . Head: Head capsule as in Figs. 1–2 View Figs , HL = 0.60 mm, HL/LAS = 4.61. Abdomen: As in Figs. 10–11 View Figs , U 1 View Figs = 0.75 mm; U1/HW = 1.55.

Instar II

No specimen available for study.

Instar III

( Figs. 13–14 View Figs , 16–19 View Figs View Figs )

Description. Color: Head capsule predominantly yellow; frontoclypeus with a broad, black, subapical macula ( Fig. 16 View Figs ); head appendages dark yellow; thoracic tergites dark brown; abdominal tergites I, IV – VII dark brown, II and III dark yellow to pale brown and VIII pale yellow; urogomphi dark yellow to pale brown; legs dark brown proximally, pale yellow distally. Body: Measurements and ratios that characterize the body shape in Table 1 View Table 1 . Head: Head capsule as in Fig. 16 View Figs , HL = 1.24–1.30, HL/LAS <4.50. Abdomen: U1 = 1.51–1.69 mm, U1/HW = 1.56–1.67 ( Fig. 19 View Figs ). Chaetotaxy: ProFE with more than 52 secondary setae; mesoFE with more than 56 secondary setae; mesoTI with more than 47 secondary setae; mesoTA with more than 34 secondary setae; metaCO with more than 26 secondary setae; metaFE with more than 66 secondary setae; metaTI with more than 50 secondary setae; metaTA with more than 43 secondary setae.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Dytiscidae

Genus

Barretthydrus

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