title: Ontogenetic trajectory and allometry of Diplonychus rusticus (Fabricius), an Oriental aquatic bug (Hemiptera: Belostomatidae) from the Western Ghats of India.
abstract: Despite being one of the dominant groups in freshwater ecosystems, morphological and ontogenetic studies on aquatic Hemiptera have received little attention in the Oriental region. We present the ontogenetic trajectory and allometry of the widespread Oriental belostomatid species, Diplonychus rusticus (Fabricius) for the first time. We have measured nine different morphological variables throughout the growth of the bug using both field captured and laboratory reared specimens. Our results suggest that the developmental instars can be distinguished by the size variables, as seen in the Principal Component Analysis. On the basis of a CHAID (Chi-squared Automatic Interaction Detection) based regression tree, we also show that the characters - total length without head and maximum width - prove to be adequate for effective instar identification. The multivariate allometric growth pattern shows that different body parts exhibit different types of allometry. This is apparent in the allometry exhibited by forelegs and mid and hind legs, which show allometry of opposite polarities. This may be due to the different functions attributed to these body parts. Our results show that the growth pattern in D. rusticus is comparable with the New World genus Belostoma, suggesting a conserved growth pattern in the family Belostomatidae.
authors.affiliation: Dept. of Zoology, Prof. Ramkrishna More Arts, Commerce and Science College, Akurdi, Pradhikaran, Pune 411 044, India.
authors.forename: Dnyaneshwar
authors.initials: D
authors.lastname: Doke
authors.affiliation: Dept. of Zoology, Prof. Ramkrishna More Arts, Commerce and Science College, Akurdi, Pradhikaran, Pune 411 044, India.
authors.forename: Rashmi
authors.initials: R
authors.lastname: Morey
authors.affiliation: Indian Institute of Science Education and Research, G1 Block, Dr. Homi Bhabha Road, Pashan, Pune 411 008, India; Systematics, Ecology and Conservation Laboratory, Zoo Outreach Organization (ZOO), No. 12 Thiruvannamalai Nagar, Saravanampatti - Kalapatti Road, Saravanampatti, Coimbatore 641 035, Tamil Nadu, India.
authors.forename: Neelesh
authors.initials: N
authors.lastname: Dahanukar
authors.affiliation: Wildlife Information Liaison Development Society, No. 12 Thiruvannamalai Nagar, Saravanampatti - Kalapatti Road, Saravanampatti, Coimbatore 641 035, Tamil Nadu, India; Dept. of Biodiversity, MES' Abasaheb Garware College of Arts and Science, Karve Road, Pune 411 004, India.
authors.forename: Sameer M
authors.initials: SM
authors.lastname: Padhye
authors.affiliation: Dept. of Biodiversity, MES' Abasaheb Garware College of Arts and Science, Karve Road, Pune 411 004, India. Electronic address: shruti.paripatyadar@gmail.com.
authors.forename: Shruti V
authors.initials: SV
authors.lastname: Paripatyadar
mesh_terms: D000818:Animals; D005260:Female; D020062:Heteroptera / Q000033:anatomy & histology* / Q000254:growth & development*; D007194:India; D008297:Male; D009758:Nymph / Q000254:growth & development
keywords: Allometric coefficients; CHAID; Developmental instar; Morphometry